build(rust): vendor googletest crate

third_party/crates/googletest-0.14.3/src/matchers/is_finite_matcher.rs

@@ -0,0 +1,84 @@
+// 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 num_traits::float::Float;
+use std::fmt::Debug;
+
+/// Matches a floating point value which is Finite.
+pub fn is_finite() -> IsFiniteMatcher {
+    IsFiniteMatcher
+}
+
+#[derive(MatcherBase)]
+pub struct IsFiniteMatcher;
+
+impl<T: Float + Debug + Copy> Matcher<T> for IsFiniteMatcher {
+    fn matches(&self, actual: T) -> MatcherResult {
+        actual.is_finite().into()
+    }
+
+    fn describe(&self, matcher_result: MatcherResult) -> Description {
+        if matcher_result.into() { "is Finite" } else { "isn't Finite" }.into()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::prelude::*;
+    use crate::Result;
+
+    #[test]
+    fn matches_f32_number() -> Result<()> {
+        verify_that!(0.0f32, is_finite())
+    }
+
+    #[test]
+    fn does_not_match_f32_pos_infinity() -> Result<()> {
+        verify_that!(f32::INFINITY, not(is_finite()))
+    }
+
+    #[test]
+    fn does_not_match_f32_neg_infinity() -> Result<()> {
+        verify_that!(f32::NEG_INFINITY, not(is_finite()))
+    }
+
+    #[test]
+    fn does_not_match_f32_nan() -> Result<()> {
+        verify_that!(f32::NAN, not(is_finite()))
+    }
+
+    #[test]
+    fn matches_f64_number() -> Result<()> {
+        verify_that!(0.0f64, is_finite())
+    }
+
+    #[test]
+    fn does_not_match_f64_pos_infinity() -> Result<()> {
+        verify_that!(f64::INFINITY, not(is_finite()))
+    }
+
+    #[test]
+    fn does_not_match_f64_neg_infinity() -> Result<()> {
+        verify_that!(f64::NEG_INFINITY, not(is_finite()))
+    }
+
+    #[test]
+    fn does_not_match_f64_nan() -> Result<()> {
+        verify_that!(f64::NAN, not(is_finite()))
+    }
+}