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