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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::{
description::Description,
matcher::{Matcher, MatcherBase, MatcherResult},
};
use std::fmt::Debug;
/// Matches the actual value exactly when the inner matcher does _not_ match.
///
/// ```
/// # use googletest::prelude::*;
/// # fn should_pass() -> Result<()> {
/// verify_that!(0, not(eq(1)))?; // Passes
/// # Ok(())
/// # }
/// # fn should_fail() -> Result<()> {
/// verify_that!(0, not(eq(0)))?; // Fails
/// # Ok(())
/// # }
/// # should_pass().unwrap();
/// # should_fail().unwrap_err();
/// ```
pub fn not<InnerMatcherT>(inner: InnerMatcherT) -> NotMatcher<InnerMatcherT> {
NotMatcher { inner }
}
#[derive(MatcherBase)]
pub struct NotMatcher<InnerMatcherT> {
inner: InnerMatcherT,
}
impl<T: Debug + Copy, InnerMatcherT: Matcher<T>> Matcher<T> for NotMatcher<InnerMatcherT> {
fn matches(&self, actual: T) -> MatcherResult {
match self.inner.matches(actual) {
MatcherResult::Match => MatcherResult::NoMatch,
MatcherResult::NoMatch => MatcherResult::Match,
}
}
fn explain_match(&self, actual: T) -> Description {
self.inner.explain_match(actual)
}
fn describe(&self, matcher_result: MatcherResult) -> Description {
self.inner.describe(if matcher_result.into() {
MatcherResult::NoMatch
} else {
MatcherResult::Match
})
}
}
#[cfg(test)]
mod tests {
use crate::matcher::MatcherResult;
use crate::prelude::*;
use crate::Result;
use indoc::indoc;
#[test]
fn matches_when_inner_matcher_does_not_match() -> Result<()> {
let matcher = not(eq(1));
let result = matcher.matches(0);
verify_that!(result, eq(MatcherResult::Match))
}
#[test]
fn does_not_match_when_inner_matcher_matches() -> Result<()> {
let matcher = not(eq(1));
let result = matcher.matches(1);
verify_that!(result, eq(MatcherResult::NoMatch))
}
#[test]
fn match_explanation_references_actual_value() -> Result<()> {
let result = verify_that!(&[1], not(container_eq([1])));
verify_that!(
result,
err(displays_as(contains_substring(indoc!(
"
Actual: [1],
which contains all the elements
"
))))
)
}
}