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<h1>datetime_extended_spec.sl</h1>
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<td class="line-num">1</td>
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<td class="code-content"><pre>// ============================================================================</pre></td>
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<td class="code-content"><pre>// DateTime Extended Test Suite</pre></td>
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<td class="code-content"><pre>// ============================================================================</pre></td>
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<td class="code-content"><pre>// Additional tests for DateTime and Duration methods not covered in datetime_spec.sl</pre></td>
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<td class="code-content"><pre>// ============================================================================</pre></td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">7</td>
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<td class="code-content"><pre>describe("DateTime Instance Methods - Extended", fn() {</pre></td>
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<td class="line-num">8</td>
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<td class="code-content"><pre> test("millisecond() returns millisecond component", fn() {</pre></td>
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<td class="line-num">9</td>
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<td class="code-content"><pre> let dt = DateTime.from_unix(1704067200000);</pre></td>
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<td class="line-num">10</td>
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<td class="code-content"><pre> let ms = dt.millisecond();</pre></td>
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<td class="line-num">11</td>
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<td class="code-content"><pre> assert(ms >= 0);</pre></td>
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<td class="line-num">12</td>
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<td class="code-content"><pre> assert(ms < 1000);</pre></td>
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<td class="line-num">13</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">15</td>
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<td class="code-content"><pre> test("millisecond() is consistent with timestamp", fn() {</pre></td>
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<td class="line-num">16</td>
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<td class="code-content"><pre> let dt = DateTime.now();</pre></td>
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<td class="line-num">17</td>
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<td class="code-content"><pre> let ms = dt.millisecond();</pre></td>
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<td class="line-num">18</td>
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<td class="code-content"><pre> assert_eq(ms, dt.timestamp() % 1000000000 / 1000000);</pre></td>
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<td class="line-num">19</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">20</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">21</td>
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<td class="code-content"><pre> test("weekday() returns weekday name", fn() {</pre></td>
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<td class="line-num">22</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
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<td class="line-num">23</td>
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<td class="code-content"><pre> let day = dt.weekday();</pre></td>
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<td class="line-num">24</td>
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<td class="code-content"><pre> assert_not_null(day);</pre></td>
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<td class="line-num">25</td>
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<td class="code-content"><pre> assert(day == "Monday" || day == "Tuesday" || day == "Wednesday" ||</pre></td>
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<td class="line-num">26</td>
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<td class="code-content"><pre> day == "Thursday" || day == "Friday" || day == "Saturday" || day == "Sunday");</pre></td>
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<td class="line-num">27</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">28</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">29</td>
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<td class="code-content"><pre> test("weekday() is correct for known date", fn() {</pre></td>
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<td class="line-num">30</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-01-01T00:00:00Z");</pre></td>
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<td class="line-num">31</td>
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<td class="code-content"><pre> let day = dt.weekday();</pre></td>
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<td class="line-num">32</td>
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<td class="code-content"><pre> assert_eq(day, "Monday");</pre></td>
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<td class="line-num">33</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">34</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">35</td>
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<td class="code-content"><pre> test("to_iso() returns ISO 8601 formatted string", fn() {</pre></td>
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<td class="line-num">36</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:30:00Z");</pre></td>
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<td class="line-num">37</td>
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<td class="code-content"><pre> let iso = dt.to_iso();</pre></td>
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<td class="line-num">38</td>
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<td class="code-content"><pre> assert_contains(iso, "2024");</pre></td>
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<td class="line-num">39</td>
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<td class="code-content"><pre> assert_contains(iso, "01");</pre></td>
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<td class="line-num">40</td>
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<td class="code-content"><pre> assert_contains(iso, "15");</pre></td>
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<td class="line-num">41</td>
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<td class="code-content"><pre> assert_contains(iso, "T");</pre></td>
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<td class="line-num">42</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">43</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">44</td>
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<td class="code-content"><pre> test("to_iso() includes time with Z suffix", fn() {</pre></td>
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<td class="line-num">45</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-06-15T14:30:00Z");</pre></td>
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<td class="line-num">46</td>
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<td class="code-content"><pre> let iso = dt.to_iso();</pre></td>
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<td class="line-num">47</td>
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<td class="code-content"><pre> assert_contains(iso, "Z");</pre></td>
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<td class="line-num">48</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">49</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">50</td>
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<td class="code-content"><pre> test("to_string() returns formatted datetime string", fn() {</pre></td>
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<td class="line-num">51</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:30:00Z");</pre></td>
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<td class="line-num">52</td>
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<td class="code-content"><pre> let str = dt.to_string();</pre></td>
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<td class="line-num">53</td>
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<td class="code-content"><pre> assert_not_null(str);</pre></td>
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<td class="line-num">54</td>
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<td class="code-content"><pre> assert(len(str) > 0);</pre></td>
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<td class="line-num">55</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">56</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">57</td>
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<td class="code-content"><pre> test("to_string() contains date components", fn() {</pre></td>
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<td class="line-num">58</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-03-25T15:45:30Z");</pre></td>
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<td class="line-num">59</td>
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<td class="code-content"><pre> let str = dt.to_string();</pre></td>
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<td class="line-num">60</td>
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<td class="code-content"><pre> assert_contains(str, "2024");</pre></td>
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<td class="line-num">61</td>
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<td class="code-content"><pre> assert_contains(str, "03");</pre></td>
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<td class="line-num">62</td>
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<td class="code-content"><pre> assert_contains(str, "25");</pre></td>
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<td class="line-num">63</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">64</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">65</td>
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<td class="code-content"><pre> test("all datetime components together", fn() {</pre></td>
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<td class="line-num">66</td>
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<td class="code-content"><pre> let dt = DateTime.parse("2024-07-20T14:35:45.123Z");</pre></td>
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<td class="line-num">67</td>
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<td class="code-content"><pre> assert_eq(dt.year(), 2024);</pre></td>
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<td class="line-num">68</td>
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<td class="code-content"><pre> assert_eq(dt.month(), 7);</pre></td>
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<td class="line-num">69</td>
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<td class="code-content"><pre> assert_eq(dt.day(), 20);</pre></td>
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<td class="line-num">70</td>
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<td class="code-content"><pre> assert_eq(dt.hour(), 14);</pre></td>
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<td class="line-num">71</td>
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<td class="code-content"><pre> assert_eq(dt.minute(), 35);</pre></td>
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<td class="line-num">72</td>
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<td class="code-content"><pre> assert_eq(dt.second(), 45);</pre></td>
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<td class="line-num">73</td>
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<td class="code-content"><pre> assert_eq(dt.millisecond(), 123);</pre></td>
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<td class="line-num">74</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">75</td>
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<td class="code-content"><pre>});</pre></td>
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<td class="line-num">76</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">77</td>
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<td class="code-content"><pre>describe("DateTime Static Methods - Extended", fn() {</pre></td>
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<td class="line-num">78</td>
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<td class="code-content"><pre> test("DateTime.utc() creates datetime in UTC", fn() {</pre></td>
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<td class="line-num">79</td>
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<td class="code-content"><pre> let dt = DateTime.utc(2024, 6, 15, 10, 30, 0);</pre></td>
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<td class="line-num">80</td>
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<td class="code-content"><pre> assert_not_null(dt);</pre></td>
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<td class="line-num">81</td>
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<td class="code-content"><pre> assert_eq(dt.year(), 2024);</pre></td>
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<td class="line-num">82</td>
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<td class="code-content"><pre> assert_eq(dt.month(), 6);</pre></td>
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<td class="line-num">83</td>
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<td class="code-content"><pre> assert_eq(dt.day(), 15);</pre></td>
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<td class="line-num">84</td>
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<td class="code-content"><pre> assert_eq(dt.hour(), 10);</pre></td>
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<td class="line-num">85</td>
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<td class="code-content"><pre> assert_eq(dt.minute(), 30);</pre></td>
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<td class="line-num">86</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">87</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">88</td>
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<td class="code-content"><pre> test("DateTime.utc() with seconds", fn() {</pre></td>
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<td class="line-num">89</td>
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<td class="code-content"><pre> let dt = DateTime.utc(2024, 1, 1, 0, 0, 30);</pre></td>
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<td class="line-num">90</td>
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<td class="code-content"><pre> assert_eq(dt.second(), 30);</pre></td>
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<td class="line-num">91</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">92</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">93</td>
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<td class="code-content"><pre> test("DateTime.utc() with milliseconds", fn() {</pre></td>
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<td class="line-num">94</td>
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<td class="code-content"><pre> let dt = DateTime.utc(2024, 1, 1, 0, 0, 0, 500);</pre></td>
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<td class="line-num">95</td>
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<td class="code-content"><pre> assert_eq(dt.millisecond(), 500);</pre></td>
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<td class="line-num">96</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">97</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">98</td>
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<td class="code-content"><pre> test("DateTime.epoch() returns epoch datetime", fn() {</pre></td>
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<td class="line-num">99</td>
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<td class="code-content"><pre> let epoch = DateTime.epoch();</pre></td>
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<td class="line-num">100</td>
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<td class="code-content"><pre> assert_not_null(epoch);</pre></td>
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<td class="line-num">101</td>
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<td class="code-content"><pre> assert_eq(epoch.year(), 1970);</pre></td>
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<td class="line-num">102</td>
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<td class="code-content"><pre> assert_eq(epoch.month(), 1);</pre></td>
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<td class="line-num">103</td>
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<td class="code-content"><pre> assert_eq(epoch.day(), 1);</pre></td>
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<td class="line-num">104</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">105</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">106</td>
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<td class="code-content"><pre> test("DateTime.epoch() timestamp is zero", fn() {</pre></td>
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<td class="line-num">107</td>
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<td class="code-content"><pre> let epoch = DateTime.epoch();</pre></td>
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<td class="line-num">108</td>
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<td class="code-content"><pre> assert_eq(epoch.to_unix(), 0);</pre></td>
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<td class="line-num">109</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">110</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">111</td>
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<td class="code-content"><pre> test("DateTime.parse() with different formats", fn() {</pre></td>
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<td class="line-num">112</td>
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<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15");</pre></td>
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<td class="line-num">113</td>
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<td class="code-content"><pre> assert_not_null(dt1);</pre></td>
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<td class="line-num">114</td>
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<td class="code-content"><pre> assert_eq(dt1.year(), 2024);</pre></td>
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<td class="line-num">115</td>
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<td class="code-content"><pre> assert_eq(dt1.month(), 1);</pre></td>
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<td class="line-num">116</td>
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<td class="code-content"><pre> assert_eq(dt1.day(), 15);</pre></td>
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<td class="line-num">117</td>
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<td class="code-content"><pre> });</pre></td>
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<td class="line-num">118</td>
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<td class="code-content"><pre></pre></td>
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<td class="line-num">119</td>
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<td class="code-content"><pre> test("DateTime.parse() with time only", fn() {</pre></td>
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<td class="line-num">120</td>
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<td class="code-content"><pre> let dt = DateTime.parse("14:30:00");</pre></td>
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<td class="line-num">121</td>
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<td class="code-content"><pre> assert_not_null(dt);</pre></td>
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<td class="line-num">122</td>
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<td class="code-content"><pre> assert_eq(dt.hour(), 14);</pre></td>
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<td class="line-num">123</td>
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<td class="code-content"><pre> assert_eq(dt.minute(), 30);</pre></td>
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<td class="line-num">124</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">125</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">126</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("DateTime.parse() with timezone offset", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">127</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:00:00+05:30");</pre></td>
</tr><tr class="code-line">
<td class="line-num">128</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not_null(dt);</pre></td>
</tr><tr class="code-line">
<td class="line-num">129</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">130</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr><tr class="code-line">
<td class="line-num">131</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">132</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>describe("Duration Static Methods - Extended", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">133</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("Duration.weeks() creates duration from weeks", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">134</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.weeks(2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">135</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not_null(dur);</pre></td>
</tr><tr class="code-line">
<td class="line-num">136</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(dur.total_days(), 14);</pre></td>
</tr><tr class="code-line">
<td class="line-num">137</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">138</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">139</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("Duration.weeks() total seconds", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">140</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.weeks(1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">141</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(dur.total_seconds(), 604800.0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">142</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">143</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">144</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("Duration.of_weeks() alias works", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">145</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_weeks(3);</pre></td>
</tr><tr class="code-line">
<td class="line-num">146</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(dur.total_days(), 21);</pre></td>
</tr><tr class="code-line">
<td class="line-num">147</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">148</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr><tr class="code-line">
<td class="line-num">149</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">150</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>describe("Duration Instance Methods - Extended", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">151</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("to_string() returns formatted duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">152</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_seconds(3661);</pre></td>
</tr><tr class="code-line">
<td class="line-num">153</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let str = dur.to_string();</pre></td>
</tr><tr class="code-line">
<td class="line-num">154</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not_null(str);</pre></td>
</tr><tr class="code-line">
<td class="line-num">155</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(len(str) > 0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">156</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">157</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">158</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("to_string() includes time components", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">159</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_hours(2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">160</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let str = dur.to_string();</pre></td>
</tr><tr class="code-line">
<td class="line-num">161</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_contains(str, "2");</pre></td>
</tr><tr class="code-line">
<td class="line-num">162</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">163</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">164</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("to_string() for zero duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">165</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_seconds(0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">166</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let str = dur.to_string();</pre></td>
</tr><tr class="code-line">
<td class="line-num">167</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not_null(str);</pre></td>
</tr><tr class="code-line">
<td class="line-num">168</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">169</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">170</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("to_string() for large duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">171</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_days(365);</pre></td>
</tr><tr class="code-line">
<td class="line-num">172</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let str = dur.to_string();</pre></td>
</tr><tr class="code-line">
<td class="line-num">173</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not_null(str);</pre></td>
</tr><tr class="code-line">
<td class="line-num">174</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(len(str) > 0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">175</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">176</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">177</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("negated() creates negative duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">178</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_seconds(60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">179</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = dur1.negated();</pre></td>
</tr><tr class="code-line">
<td class="line-num">180</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dur2.total_seconds() < 0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">181</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">182</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">183</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("abs() returns absolute duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">184</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_seconds(-60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">185</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = dur1.abs();</pre></td>
</tr><tr class="code-line">
<td class="line-num">186</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(dur2.total_seconds(), 60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">187</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">188</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">189</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_zero() checks if duration is zero", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">190</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_seconds(0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">191</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = Duration.of_seconds(1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">192</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dur1.is_zero());</pre></td>
</tr><tr class="code-line">
<td class="line-num">193</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not(dur2.is_zero());</pre></td>
</tr><tr class="code-line">
<td class="line-num">194</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">195</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">196</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_negative() checks if duration is negative", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">197</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_seconds(-1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">198</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = Duration.of_seconds(1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">199</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dur1.is_negative());</pre></td>
</tr><tr class="code-line">
<td class="line-num">200</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not(dur2.is_negative());</pre></td>
</tr><tr class="code-line">
<td class="line-num">201</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">202</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr><tr class="code-line">
<td class="line-num">203</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">204</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>describe("DateTime Arithmetic - Extended", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">205</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_hours() wraps across days", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">206</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T20:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">207</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_hours(10);</pre></td>
</tr><tr class="code-line">
<td class="line-num">208</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.day(), 16);</pre></td>
</tr><tr class="code-line">
<td class="line-num">209</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.hour(), 6);</pre></td>
</tr><tr class="code-line">
<td class="line-num">210</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">211</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">212</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_hours() wraps across months", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">213</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-31T22:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">214</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_hours(5);</pre></td>
</tr><tr class="code-line">
<td class="line-num">215</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.month(), 2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">216</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.day(), 1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">217</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">218</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">219</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_hours() handles leap year", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">220</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-02-28T22:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">221</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_hours(5);</pre></td>
</tr><tr class="code-line">
<td class="line-num">222</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.month(), 2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">223</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.day(), 29);</pre></td>
</tr><tr class="code-line">
<td class="line-num">224</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">225</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">226</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_minutes() across hour boundary", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">227</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:45:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">228</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_minutes(30);</pre></td>
</tr><tr class="code-line">
<td class="line-num">229</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.hour(), 11);</pre></td>
</tr><tr class="code-line">
<td class="line-num">230</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.minute(), 15);</pre></td>
</tr><tr class="code-line">
<td class="line-num">231</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">232</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">233</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("subtract_hours() across day boundary", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">234</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T02:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">235</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let earlier = dt.subtract_hours(5);</pre></td>
</tr><tr class="code-line">
<td class="line-num">236</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(earlier.day(), 14);</pre></td>
</tr><tr class="code-line">
<td class="line-num">237</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(earlier.hour(), 21);</pre></td>
</tr><tr class="code-line">
<td class="line-num">238</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">239</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">240</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_seconds() works", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">241</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.from_unix(1704067200);</pre></td>
</tr><tr class="code-line">
<td class="line-num">242</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_seconds(60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">243</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.to_unix(), 1704067260);</pre></td>
</tr><tr class="code-line">
<td class="line-num">244</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">245</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">246</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_months() wraps years", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">247</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-12-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">248</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_months(3);</pre></td>
</tr><tr class="code-line">
<td class="line-num">249</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.year(), 2025);</pre></td>
</tr><tr class="code-line">
<td class="line-num">250</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.month(), 3);</pre></td>
</tr><tr class="code-line">
<td class="line-num">251</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">252</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">253</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("add_years() works", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">254</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">255</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let later = dt.add_years(5);</pre></td>
</tr><tr class="code-line">
<td class="line-num">256</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(later.year(), 2029);</pre></td>
</tr><tr class="code-line">
<td class="line-num">257</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">258</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr><tr class="code-line">
<td class="line-num">259</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">260</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>describe("DateTime Comparison", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">261</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("compare() returns -1, 0, or 1", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">262</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">263</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt2 = DateTime.parse("2024-01-15T11:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">264</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let cmp = dt1.compare(dt2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">265</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(cmp <= 0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">266</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">267</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">268</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_before() checks if datetime is before another", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">269</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">270</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt2 = DateTime.parse("2024-01-15T11:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">271</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dt1.is_before(dt2));</pre></td>
</tr><tr class="code-line">
<td class="line-num">272</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not(dt2.is_before(dt1));</pre></td>
</tr><tr class="code-line">
<td class="line-num">273</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">274</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">275</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_after() checks if datetime is after another", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">276</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">277</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt2 = DateTime.parse("2024-01-15T11:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">278</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dt2.is_after(dt1));</pre></td>
</tr><tr class="code-line">
<td class="line-num">279</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not(dt1.is_after(dt2));</pre></td>
</tr><tr class="code-line">
<td class="line-num">280</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">281</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">282</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_same_day() checks if same calendar day", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">283</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15T10:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">284</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt2 = DateTime.parse("2024-01-15T23:59:59Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">285</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(dt1.is_same_day(dt2));</pre></td>
</tr><tr class="code-line">
<td class="line-num">286</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">287</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">288</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("is_same_day() false for different days", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">289</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt1 = DateTime.parse("2024-01-15T23:59:59Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">290</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dt2 = DateTime.parse("2024-01-16T00:00:00Z");</pre></td>
</tr><tr class="code-line">
<td class="line-num">291</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_not(dt1.is_same_day(dt2));</pre></td>
</tr><tr class="code-line">
<td class="line-num">292</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">293</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr><tr class="code-line">
<td class="line-num">294</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">295</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>describe("Duration Arithmetic - Extended", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">296</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("plus() adds two durations", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">297</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_hours(1);</pre></td>
</tr><tr class="code-line">
<td class="line-num">298</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = Duration.of_minutes(30);</pre></td>
</tr><tr class="code-line">
<td class="line-num">299</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur1.plus(dur2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">300</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(result.total_minutes(), 90);</pre></td>
</tr><tr class="code-line">
<td class="line-num">301</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">302</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">303</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("minus() subtracts durations", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">304</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur1 = Duration.of_hours(2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">305</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur2 = Duration.of_minutes(30);</pre></td>
</tr><tr class="code-line">
<td class="line-num">306</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur1.minus(dur2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">307</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(result.total_minutes(), 90);</pre></td>
</tr><tr class="code-line">
<td class="line-num">308</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">309</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">310</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("multiplied_by() scales duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">311</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_minutes(30);</pre></td>
</tr><tr class="code-line">
<td class="line-num">312</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur.multiplied_by(2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">313</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(result.total_minutes(), 60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">314</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">315</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">316</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("divided_by() divides duration", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">317</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_minutes(60);</pre></td>
</tr><tr class="code-line">
<td class="line-num">318</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur.divided_by(2);</pre></td>
</tr><tr class="code-line">
<td class="line-num">319</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(result.total_minutes(), 30);</pre></td>
</tr><tr class="code-line">
<td class="line-num">320</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">321</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">322</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("divided_by() by zero returns infinity", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">323</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_seconds(10);</pre></td>
</tr><tr class="code-line">
<td class="line-num">324</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur.divided_by(0);</pre></td>
</tr><tr class="code-line">
<td class="line-num">325</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert(result.total_minutes() == Infinity);</pre></td>
</tr><tr class="code-line">
<td class="line-num">326</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">327</td>
<td class="line-indicator"></td>
<td class="code-content"><pre></pre></td>
</tr><tr class="code-line">
<td class="line-num">328</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> test("modulo() returns remainder", fn() {</pre></td>
</tr><tr class="code-line">
<td class="line-num">329</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let dur = Duration.of_seconds(100);</pre></td>
</tr><tr class="code-line">
<td class="line-num">330</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> let result = dur.modulo(Duration.of_seconds(30));</pre></td>
</tr><tr class="code-line">
<td class="line-num">331</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> assert_eq(result.total_seconds(), 10);</pre></td>
</tr><tr class="code-line">
<td class="line-num">332</td>
<td class="line-indicator"></td>
<td class="code-content"><pre> });</pre></td>
</tr><tr class="code-line">
<td class="line-num">333</td>
<td class="line-indicator"></td>
<td class="code-content"><pre>});</pre></td>
</tr>
</tbody>
</table>
</section>
</div>
</body>
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