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Added IsNan matcher

PiperOrigin-RevId: 275278634
This commit is contained in:
Abseil Team 2019-10-17 12:50:10 -04:00 committed by Gennadiy Civil
parent 2995ca563d
commit bbe4b7363b
3 changed files with 133 additions and 2 deletions
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1
googlemock/docs/cheat_sheet.md
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@ -287,6 +287,7 @@ is not changed afterwards, or the meaning of your matcher will be changed.
| `FloatEq(a_float)` | `argument` is a `float` value approximately equal to `a_float`, treating two NaNs as unequal. |
| `NanSensitiveDoubleEq(a_double)` | `argument` is a `double` value approximately equal to `a_double`, treating two NaNs as equal. |
| `NanSensitiveFloatEq(a_float)` | `argument` is a `float` value approximately equal to `a_float`, treating two NaNs as equal. |
| `IsNan()` | `argument` is any floating-point type with a NaN value. |
<!-- mdformat on -->
The above matchers use ULP-based comparison (the same as used in googletest).

26
googlemock/include/gmock/gmock-matchers.h
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@ -42,8 +42,8 @@
#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#define GMOCK_INCLUDE_GMOCK_GMOCK_MATCHERS_H_
#include <math.h>
#include <algorithm>
#include <cmath>
#include <initializer_list>
#include <iterator>
#include <limits>
@ -54,6 +54,7 @@
#include <type_traits>
#include <utility>
#include <vector>
#include "gmock/internal/gmock-internal-utils.h"
#include "gmock/internal/gmock-port.h"
#include "gtest/gtest.h"
@ -1349,6 +1350,22 @@ MakePredicateFormatterFromMatcher(M matcher) {
return PredicateFormatterFromMatcher<M>(std::move(matcher));
}
// Implements the polymorphic IsNan() matcher, which matches any floating type
// value that is Nan.
class IsNanMatcher {
public:
template <typename FloatType>
bool MatchAndExplain(const FloatType& f,
MatchResultListener* /* listener */) const {
return (::std::isnan)(f);
}
void DescribeTo(::std::ostream* os) const { *os << "is NaN"; }
void DescribeNegationTo(::std::ostream* os) const {
*os << "isn't NaN";
}
};
// Implements the polymorphic floating point equality matcher, which matches
// two float values using ULP-based approximation or, optionally, a
// user-specified epsilon. The template is meant to be instantiated with
@ -1409,7 +1426,7 @@ class FloatingEqMatcher {
}
const FloatType diff = value - expected_;
if (fabs(diff) <= max_abs_error_) {
if (::std::fabs(diff) <= max_abs_error_) {
return true;
}
@ -3626,6 +3643,11 @@ inline internal::RefMatcher<T&> Ref(T& x) { // NOLINT
return internal::RefMatcher<T&>(x);
}
// Creates a polymorphic matcher that matches any NaN floating point.
inline PolymorphicMatcher<internal::IsNanMatcher> IsNan() {
return MakePolymorphicMatcher(internal::IsNanMatcher());
}
// Creates a matcher that matches any double argument approximately
// equal to rhs, where two NANs are considered unequal.
inline internal::FloatingEqMatcher<double> DoubleEq(double rhs) {

108
googlemock/test/gmock-matchers_test.cc
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@ -2054,6 +2054,114 @@ TEST(PairMatchBaseTest, WorksWithMoveOnly) {
EXPECT_TRUE(matcher.Matches(pointers));
}
// Tests that IsNan() matches a NaN, with float.
TEST(IsNan, FloatMatchesNan) {
float quiet_nan = std::numeric_limits<float>::quiet_NaN();
float other_nan = std::nan("1");
float real_value = 1.0f;
Matcher<float> m = IsNan();
EXPECT_TRUE(m.Matches(quiet_nan));
EXPECT_TRUE(m.Matches(other_nan));
EXPECT_FALSE(m.Matches(real_value));
Matcher<float&> m_ref = IsNan();
EXPECT_TRUE(m_ref.Matches(quiet_nan));
EXPECT_TRUE(m_ref.Matches(other_nan));
EXPECT_FALSE(m_ref.Matches(real_value));
Matcher<const float&> m_cref = IsNan();
EXPECT_TRUE(m_cref.Matches(quiet_nan));
EXPECT_TRUE(m_cref.Matches(other_nan));
EXPECT_FALSE(m_cref.Matches(real_value));
}
// Tests that IsNan() matches a NaN, with double.
TEST(IsNan, DoubleMatchesNan) {
double quiet_nan = std::numeric_limits<double>::quiet_NaN();
double other_nan = std::nan("1");
double real_value = 1.0;
Matcher<double> m = IsNan();
EXPECT_TRUE(m.Matches(quiet_nan));
EXPECT_TRUE(m.Matches(other_nan));
EXPECT_FALSE(m.Matches(real_value));
Matcher<double&> m_ref = IsNan();
EXPECT_TRUE(m_ref.Matches(quiet_nan));
EXPECT_TRUE(m_ref.Matches(other_nan));
EXPECT_FALSE(m_ref.Matches(real_value));
Matcher<const double&> m_cref = IsNan();
EXPECT_TRUE(m_cref.Matches(quiet_nan));
EXPECT_TRUE(m_cref.Matches(other_nan));
EXPECT_FALSE(m_cref.Matches(real_value));
}
// Tests that IsNan() matches a NaN, with long double.
TEST(IsNan, LongDoubleMatchesNan) {
long double quiet_nan = std::numeric_limits<long double>::quiet_NaN();
long double other_nan = std::nan("1");
long double real_value = 1.0;
Matcher<long double> m = IsNan();
EXPECT_TRUE(m.Matches(quiet_nan));
EXPECT_TRUE(m.Matches(other_nan));
EXPECT_FALSE(m.Matches(real_value));
Matcher<long double&> m_ref = IsNan();
EXPECT_TRUE(m_ref.Matches(quiet_nan));
EXPECT_TRUE(m_ref.Matches(other_nan));
EXPECT_FALSE(m_ref.Matches(real_value));
Matcher<const long double&> m_cref = IsNan();
EXPECT_TRUE(m_cref.Matches(quiet_nan));
EXPECT_TRUE(m_cref.Matches(other_nan));
EXPECT_FALSE(m_cref.Matches(real_value));
}
// Tests that IsNan() works with Not.
TEST(IsNan, NotMatchesNan) {
Matcher<float> mf = Not(IsNan());
EXPECT_FALSE(mf.Matches(std::numeric_limits<float>::quiet_NaN()));
EXPECT_FALSE(mf.Matches(std::nan("1")));
EXPECT_TRUE(mf.Matches(1.0));
Matcher<double> md = Not(IsNan());
EXPECT_FALSE(md.Matches(std::numeric_limits<double>::quiet_NaN()));
EXPECT_FALSE(md.Matches(std::nan("1")));
EXPECT_TRUE(md.Matches(1.0));
Matcher<long double> mld = Not(IsNan());
EXPECT_FALSE(mld.Matches(std::numeric_limits<long double>::quiet_NaN()));
EXPECT_FALSE(mld.Matches(std::nan("1")));
EXPECT_TRUE(mld.Matches(1.0));
}
// Tests that IsNan() can describe itself.
TEST(IsNan, CanDescribeSelf) {
Matcher<float> mf = IsNan();
EXPECT_EQ("is NaN", Describe(mf));
Matcher<double> md = IsNan();
EXPECT_EQ("is NaN", Describe(md));
Matcher<long double> mld = IsNan();
EXPECT_EQ("is NaN", Describe(mld));
}
// Tests that IsNan() can describe itself with Not.
TEST(IsNan, CanDescribeSelfWithNot) {
Matcher<float> mf = Not(IsNan());
EXPECT_EQ("isn't NaN", Describe(mf));
Matcher<double> md = Not(IsNan());
EXPECT_EQ("isn't NaN", Describe(md));
Matcher<long double> mld = Not(IsNan());
EXPECT_EQ("isn't NaN", Describe(mld));
}
// Tests that FloatEq() matches a 2-tuple where
// FloatEq(first field) matches the second field.
TEST(FloatEq2Test, MatchesEqualArguments) {