65 lines
1.7 KiB
Rust
65 lines
1.7 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 num_traits::float::Float;
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use std::fmt::Debug;
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/// Matches a floating point value which is NaN.
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pub fn is_nan() -> IsNanMatcher {
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IsNanMatcher
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}
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#[derive(MatcherBase)]
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pub struct IsNanMatcher;
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impl<T: Float + Debug + Copy> Matcher<T> for IsNanMatcher {
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fn matches(&self, actual: T) -> MatcherResult {
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actual.is_nan().into()
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}
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fn describe(&self, matcher_result: MatcherResult) -> Description {
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if matcher_result.into() { "is NaN" } else { "isn't NaN" }.into()
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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::prelude::*;
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use crate::Result;
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#[test]
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fn matches_f32_nan() -> Result<()> {
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verify_that!(f32::NAN, is_nan())
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}
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#[test]
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fn does_not_match_f32_number() -> Result<()> {
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verify_that!(0.0f32, not(is_nan()))
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}
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#[test]
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fn matches_f64_nan() -> Result<()> {
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verify_that!(f64::NAN, is_nan())
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}
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#[test]
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fn does_not_match_f64_number() -> Result<()> {
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verify_that!(0.0f64, not(is_nan()))
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}
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}
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