easy_assert/
custom_assertions.rs

1//! ## Usage
2//!
3//! ``` rust
4//! use easy_assert::{actual_with, expected_with};
5//! use easy_assert::custom_assertions::CustomAssert;
6//!
7//! struct TestStruct {
8//!     a: i32,
9//!     b: String,
10//!     c: bool,
11//! }
12//!
13//! fn custom_match(val1: &TestStruct, val2: &TestStruct) -> bool {
14//!     val1.a == val2.a && val1.b.eq(&val2.b) && val1.c == val2.c
15//! }
16//!
17//! fn custom_description(value: &TestStruct) -> String {
18//!     format!(
19//!         "TestStruct:\n a = {}\n, b = {}\n, c = {}",
20//!         value.a, value.b, value.c
21//!     )
22//! }
23//!
24//! #[test]
25//! fn my_test() {
26//!     let val1 = TestStruct {
27//!         a: 1,
28//!         b: String::from("a"),
29//!         c: false,
30//!     };
31//!     let val2 = TestStruct {
32//!         a: 1,
33//!         b: String::from("a"),
34//!         c: false,
35//!     };
36//!
37//!     CustomAssert::assert_that(actual_with(val1, custom_description))
38//!         .matches_by(custom_match)
39//!         .to(expected_with(val2, custom_description));
40//! }
41//! ```
42
43use crate::assertions::Matches;
44use crate::{test_failed, Actual, Expected};
45
46pub struct CustomAssert<T> {
47    actual: Actual<T>,
48}
49
50impl<T> CustomAssert<T>
51where
52    T: 'static,
53{
54    pub fn assert_that(actual: Actual<T>) -> CustomAssert<T> {
55        CustomAssert { actual }
56    }
57
58    pub fn matches_by(self, matcher: fn(&T, &T) -> bool) -> Box<dyn Matches<T>> {
59        Box::new(CustomMatcher {
60            actual: self.actual,
61            matcher,
62        })
63    }
64}
65
66struct CustomMatcher<T> {
67    actual: Actual<T>,
68    matcher: fn(&T, &T) -> bool,
69}
70
71impl<T> Matches<T> for CustomMatcher<T> {
72    fn to(&self, expected: Expected<T>) {
73        let success = (self.matcher)(&self.actual.value, &expected.value);
74        if !success {
75            let error_message = format!(
76                "\n Actual: {} \n not matches with \n Expected: {} \n",
77                self.actual, expected
78            );
79            test_failed(&error_message);
80        }
81    }
82}
easy_assert/custom_assertions.rs

easy_assert/
custom_assertions.rs
