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use std::borrow::Borrow;
use std::fmt::Debug;
use crate::matchers::{Should, ShouldNot};
use crate::matchers::equal::be_equal;
/// EqualityAssertion enables assertions about the equality of two values of type T: Eq.
pub trait EqualityAssertion<T: Eq> {
/// - Asserts that the value held by self is equal to other.
/// - Returns a reference to self for fluent chaining.
/// - Panics if the assertion fails.
/// # Example
/// ```
/// use clearcheck::assertions::equal::EqualityAssertion;
///
/// #[derive(Debug, Eq, PartialEq)]
/// struct Book {
/// name: &'static str,
/// }
///
/// let books = vec![
/// Book {name: "Database internals"},
/// Book {name: "Rust in action"}
/// ];
/// let other = vec![
/// Book {name: "Database internals"},
/// Book {name: "Rust in action"}
/// ];
/// books.should_equal(&other);
/// ```
fn should_equal<Q>(&self, other: &Q) -> &Self
where
T: Borrow<Q>,
Q: Eq + Debug + ?Sized;
/// - Asserts that the value held by self is not equal to other.
/// - Returns a reference to self for fluent chaining.
/// - Panics if the assertion fails.
/// # Example
/// ```
/// use clearcheck::assertions::equal::EqualityAssertion;
///
/// #[derive(Debug, Eq, PartialEq)]
/// struct Book {
/// name: &'static str,
/// }
///
/// let books = vec![
/// Book {name: "Database internals"},
/// ];
/// let other = vec![
/// Book {name: "Database internals"},
/// Book {name: "Rust in action"},
/// ];
/// books.should_not_equal(&other);
/// ```
fn should_not_equal<Q>(&self, other: &Q) -> &Self
where
T: Borrow<Q>,
Q: Eq + Debug + ?Sized;
}
impl<T: Eq + Debug> EqualityAssertion<T> for T {
fn should_equal<Q>(&self, other: &Q) -> &Self
where
T: Borrow<Q>,
Q: Eq + Debug + ?Sized,
{
self.borrow().should(&be_equal(other));
self
}
fn should_not_equal<Q>(&self, other: &Q) -> &Self
where
T: Borrow<Q>,
Q: Eq + Debug + ?Sized,
{
self.borrow().should_not(&be_equal(other));
self
}
}
#[cfg(test)]
mod tests {
use crate::assertions::equal::EqualityAssertion;
#[derive(Debug, Eq, PartialEq)]
struct Book {
name: &'static str,
}
#[test]
fn should_equal() {
let books = &vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
let target = vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
books.should_equal(&target);
}
#[test]
#[should_panic]
fn should_equal_but_was_not() {
let books = &vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
let target = vec![
Book {
name: "Database internals",
},
Book {
name: "Learning Rust",
},
];
books.should_equal(&target);
}
#[test]
fn should_not_equal() {
let books = &vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
let target = vec![Book {
name: "Database internals",
}];
books.should_not_equal(&target);
}
#[test]
#[should_panic]
fn should_not_equal_but_was() {
let books = &vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
let target = vec![
Book {
name: "Database internals",
},
Book {
name: "Rust in action",
},
];
books.should_not_equal(&target);
}
#[test]
fn should_equal_strings() {
let name = "junit";
name.should_equal("junit");
}
}