Trait AssertHasError

pub trait AssertHasError<E> {
    // Required method
    fn has_error(self, expected: E) -> Self;
}

Assert that a subject of some container type holds an error value that is equal to the expected one.

This assertion is implemented for the Result type. It compares the value in Err(value) with the expected one. The error type in the Result must implement PartialEq<E> where E is the type of the expected error value.

To assert the ok value of a Result use AssertHasValue::has_value.

Examples

use asserting::prelude::*;

let subject: Result<(), String> = Err("labore gubergren ut ipsum".to_string());
assert_that!(subject).has_error("labore gubergren ut ipsum");

Required Methods

fn has_error(self, expected: E) -> Self

Verifies that the subject holds an error value that is equal to the expected one.

For Result it compares the value in Err(value). If the Result holds an Ok(value), the assertion fails.

Examples

use asserting::prelude::*;

let subject: Result<(), String> = Err("labore gubergren ut ipsum".to_string());
assert_that!(subject).has_error("labore gubergren ut ipsum");

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T, E, X, R> AssertHasError<X> for Spec<'_, Result<T, E>, R>

where T: Debug, E: PartialEq<X> + Debug, X: Debug, R: FailingStrategy,