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// Copyright 2024 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, ops::Deref};
/// Dereferences the `actual` value and verifies that the returned reference
/// matches the `inner` matcher.
///
/// ```
/// # use googletest::{matchers::{derefs_to, eq}, verify_that};
/// verify_that!(Box::new(123), derefs_to(eq(&123)))
/// # .unwrap()
/// ```
pub fn derefs_to<Inner>(inner: Inner) -> DerefsTo<Inner> {
DerefsTo { inner }
}
/// A matcher which derefs a value and verifies that the result matches the
/// `inner` matcher.
///
/// See [`derefs_to`].
#[derive(MatcherBase)]
pub struct DerefsTo<InnerT> {
pub(crate) inner: InnerT,
}
impl<'a, ActualT, ExpectedT, Inner> Matcher<&'a ActualT> for DerefsTo<Inner>
where
ActualT: Deref<Target = ExpectedT> + Debug,
ExpectedT: Copy + Debug + 'a,
Inner: Matcher<&'a ExpectedT>,
{
fn matches(&self, actual: &'a ActualT) -> MatcherResult {
self.inner.matches(actual.deref())
}
fn describe(&self, matcher_result: MatcherResult) -> Description {
self.inner.describe(matcher_result)
}
fn explain_match(&self, actual: &'a ActualT) -> Description {
self.inner.explain_match(actual.deref())
}
}
#[cfg(test)]
mod tests {
use std::rc::Rc;
use crate::prelude::*;
use crate::Result;
use indoc::indoc;
#[test]
fn deref_to_matches_box_of_int_with_int() -> Result<()> {
let actual = Box::new(123);
verify_that!(actual, derefs_to(eq(&123)))
}
#[test]
fn deref_to_matches_rc_of_int_with_int() -> Result<()> {
verify_that!(Rc::new(123), derefs_to(eq(&123)))
}
#[test]
fn deref_to_combines_with_points_to_for_copy() -> Result<()> {
verify_that!(Rc::new(123), derefs_to(points_to(eq(123))))
}
#[test]
fn match_explanation_references_actual_value() -> Result<()> {
let actual = Box::new(1);
let result = verify_that!(actual, derefs_to(eq(&0)));
verify_that!(
result,
err(displays_as(contains_substring(indoc!(
"
Actual: 1,
which isn't equal to 0
"
))))
)
}
}