| // Copyright 2023 The Tint Authors. |
| // |
| // 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. |
| |
| #include "src/tint/utils/text/string_stream.h" |
| |
| #include <math.h> |
| #include <cstring> |
| #include <limits> |
| |
| #include "gtest/gtest.h" |
| |
| #include "src/tint/utils/traits/traits.h" |
| |
| namespace tint::utils { |
| namespace { |
| |
| static_assert(traits::IsOStream<StringStream>); |
| |
| using StringStreamTest = testing::Test; |
| |
| TEST_F(StringStreamTest, Zero) { |
| StringStream s; |
| s << 0.0f; |
| EXPECT_EQ(s.str(), "0.0"); |
| } |
| |
| TEST_F(StringStreamTest, One) { |
| StringStream s; |
| s << 1.0f; |
| EXPECT_EQ(s.str(), "1.0"); |
| } |
| |
| TEST_F(StringStreamTest, MinusOne) { |
| StringStream s; |
| s << -1.0f; |
| EXPECT_EQ(s.str(), "-1.0"); |
| } |
| |
| TEST_F(StringStreamTest, Billion) { |
| StringStream s; |
| s << 1e9f; |
| EXPECT_EQ(s.str(), "1000000000.0"); |
| } |
| |
| TEST_F(StringStreamTest, Small) { |
| StringStream s; |
| s << std::numeric_limits<float>::epsilon(); |
| EXPECT_NE(s.str(), "0.0"); |
| } |
| |
| TEST_F(StringStreamTest, Highest) { |
| const auto highest = std::numeric_limits<float>::max(); |
| const auto expected_highest = 340282346638528859811704183484516925440.0f; |
| |
| if (highest < expected_highest || highest > expected_highest) { |
| GTEST_SKIP() << "std::numeric_limits<float>::max() is not as expected for " |
| "this target"; |
| } |
| |
| StringStream s; |
| s << std::numeric_limits<float>::max(); |
| EXPECT_EQ(s.str(), "340282346638528859811704183484516925440.0"); |
| } |
| |
| TEST_F(StringStreamTest, Lowest) { |
| // Some compilers complain if you test floating point numbers for equality. |
| // So say it via two inequalities. |
| const auto lowest = std::numeric_limits<float>::lowest(); |
| const auto expected_lowest = -340282346638528859811704183484516925440.0f; |
| if (lowest < expected_lowest || lowest > expected_lowest) { |
| GTEST_SKIP() << "std::numeric_limits<float>::lowest() is not as expected for " |
| "this target"; |
| } |
| |
| StringStream s; |
| s << std::numeric_limits<float>::lowest(); |
| EXPECT_EQ(s.str(), "-340282346638528859811704183484516925440.0"); |
| } |
| |
| TEST_F(StringStreamTest, Precision) { |
| { |
| StringStream s; |
| s << 1e-8f; |
| EXPECT_EQ(s.str(), "0.00000000999999993923"); |
| } |
| { |
| StringStream s; |
| s << 1e-9f; |
| EXPECT_EQ(s.str(), "0.00000000099999997172"); |
| } |
| { |
| StringStream s; |
| s << 1e-10f; |
| EXPECT_EQ(s.str(), "0.00000000010000000134"); |
| } |
| { |
| StringStream s; |
| s << 1e-20f; |
| EXPECT_EQ(s.str(), "0.00000000000000000001"); |
| } |
| } |
| |
| } // namespace |
| } // namespace tint::utils |