debtmap 0.16.3

Code complexity and technical debt analyzer
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185

use anyhow::{anyhow, Result};
use debtmap::core::monadic::ResultExt;

#[test]
fn test_map_err_context_adds_context_on_error() {
    let result: Result<i32> = Err(anyhow!("original error"));
    let with_context = result.map_err_context("additional context");

    assert!(with_context.is_err());
    let error_string = format!("{:?}", with_context.unwrap_err());
    assert!(error_string.contains("additional context"));
    assert!(error_string.contains("original error"));
}

#[test]
fn test_map_err_context_preserves_ok_value() {
    let result: Result<i32> = Ok(42);
    let with_context = result.map_err_context("this context won't be used");

    assert!(with_context.is_ok());
    assert_eq!(with_context.unwrap(), 42);
}

#[test]
fn test_map_err_context_with_formatted_message() {
    let value = 10;
    let result: Result<i32> = Err(anyhow!("failed"));
    let with_context = result.map_err_context(format!("Processing value {value}"));

    assert!(with_context.is_err());
    let error_string = format!("{:?}", with_context.unwrap_err());
    assert!(error_string.contains("Processing value 10"));
}

#[test]
fn test_and_then_async_chains_operations() {
    let result: Result<i32> = Ok(5);
    let chained = result
        .and_then_async(|x| Ok(x * 2))
        .and_then_async(|x| Ok(x + 3));

    assert!(chained.is_ok());
    assert_eq!(chained.unwrap(), 13); // (5 * 2) + 3
}

#[test]
fn test_and_then_async_stops_on_first_error() {
    let result: Result<i32> = Ok(5);
    let chained = result
        .and_then_async(|_| Err(anyhow!("first error")))
        .and_then_async(|x: i32| Ok(x + 3)); // This won't execute

    assert!(chained.is_err());
    let error_string = format!("{:?}", chained.unwrap_err());
    assert!(error_string.contains("first error"));
}

#[test]
fn test_or_else_with_provides_alternative() {
    let result: Result<i32> = Err(anyhow!("original error"));
    let with_alternative = result.or_else_with(|| Ok(100));

    assert!(with_alternative.is_ok());
    assert_eq!(with_alternative.unwrap(), 100);
}

#[test]
fn test_or_else_with_preserves_ok() {
    let result: Result<i32> = Ok(42);
    let with_alternative = result.or_else_with(|| Ok(100));

    assert!(with_alternative.is_ok());
    assert_eq!(with_alternative.unwrap(), 42); // Original value preserved
}

#[test]
fn test_or_else_with_can_also_fail() {
    let result: Result<i32> = Err(anyhow!("original error"));
    let with_alternative = result.or_else_with(|| Err(anyhow!("alternative error")));

    assert!(with_alternative.is_err());
    let error_string = format!("{:?}", with_alternative.unwrap_err());
    assert!(error_string.contains("alternative error"));
}

#[test]
fn test_map_ok_transforms_value() {
    let result: Result<i32> = Ok(10);
    let mapped = result.map_ok(|x| x.to_string());

    assert!(mapped.is_ok());
    assert_eq!(mapped.unwrap(), "10");
}

#[test]
fn test_map_ok_preserves_error() {
    let result: Result<i32> = Err(anyhow!("error"));
    let mapped = result.map_ok(|x| x.to_string());

    assert!(mapped.is_err());
    let error_string = format!("{:?}", mapped.unwrap_err());
    assert!(error_string.contains("error"));
}

#[test]
fn test_tap_inspects_ok_value() {
    let mut side_effect = 0;
    let result: Result<i32> = Ok(42);

    let tapped = result.tap(|&x| {
        side_effect = x * 2;
    });

    assert!(tapped.is_ok());
    assert_eq!(tapped.unwrap(), 42); // Original value unchanged
    assert_eq!(side_effect, 84); // Side effect occurred
}

#[test]
fn test_tap_skips_on_error() {
    let mut side_effect = 0;
    let result: Result<i32> = Err(anyhow!("error"));

    let tapped = result.tap(|&x| {
        side_effect = x * 2;
    });

    assert!(tapped.is_err());
    assert_eq!(side_effect, 0); // Side effect didn't occur
}

#[test]
fn test_tap_err_inspects_error() {
    let mut error_message = String::new();
    let result: Result<i32> = Err(anyhow!("test error"));

    let tapped = result.tap_err(|e| {
        error_message = format!("{e}");
    });

    assert!(tapped.is_err());
    assert!(error_message.contains("test error")); // Side effect occurred
}

#[test]
fn test_tap_err_skips_on_ok() {
    let mut error_message = String::new();
    let result: Result<i32> = Ok(42);

    let tapped = result.tap_err(|e| {
        error_message = format!("{e}");
    });

    assert!(tapped.is_ok());
    assert_eq!(tapped.unwrap(), 42);
    assert_eq!(error_message, ""); // Side effect didn't occur
}

#[test]
fn test_chaining_multiple_extensions() {
    let result: Result<i32> = Ok(5);

    let final_result = result
        .map_ok(|x| x * 2)
        .and_then_async(|x| Ok(x + 1))
        .tap(|&x| assert_eq!(x, 11))
        .map_err_context("Failed to process number");

    assert!(final_result.is_ok());
    assert_eq!(final_result.unwrap(), 11);
}

#[test]
fn test_error_handling_chain() {
    let result: Result<i32> = Err(anyhow!("initial error"));

    let final_result = result
        .map_err_context("step 1 failed")
        .or_else_with(|| Ok(10))
        .and_then_async(|x| Ok(x * 2))
        .tap(|&x| assert_eq!(x, 20));

    assert!(final_result.is_ok());
    assert_eq!(final_result.unwrap(), 20);
}