| // Copyright 2021 The Pigweed 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 |
| // |
| // https://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 "pw_string/util.h" |
| |
| #include "gtest/gtest.h" |
| |
| namespace pw::string { |
| namespace { |
| |
| TEST(Length, Nullptr_Returns0) { EXPECT_EQ(0u, Length(nullptr, 100)); } |
| |
| TEST(Length, EmptyString_Returns0) { |
| EXPECT_EQ(0u, Length("", 0)); |
| EXPECT_EQ(0u, Length("", 100)); |
| } |
| |
| TEST(Length, MaxLongerThanString_ReturnsStrlen) { |
| EXPECT_EQ(5u, Length("12345", 100)); |
| } |
| |
| TEST(Length, StringMaxLongerThanMax_ReturnsMax) { |
| EXPECT_EQ(0u, Length("12345", 0)); |
| EXPECT_EQ(4u, Length("12345", 4)); |
| } |
| |
| TEST(Length, LengthEqualsMax) { EXPECT_EQ(5u, Length("12345", 5)); } |
| |
| class TestWithBuffer : public ::testing::Test { |
| protected: |
| static constexpr char kStartingString[] = "!@#$%^&*()!@#$%^&*()"; |
| |
| TestWithBuffer() { std::memcpy(buffer_, kStartingString, sizeof(buffer_)); } |
| |
| char buffer_[sizeof(kStartingString)]; |
| }; |
| |
| class CopyTest : public TestWithBuffer {}; |
| |
| using namespace std::literals::string_view_literals; |
| |
| TEST_F(CopyTest, EmptyStringView_WritesNullTerminator) { |
| EXPECT_EQ(0u, Copy("", buffer_).size()); |
| EXPECT_EQ('\0', buffer_[0]); |
| } |
| |
| TEST_F(CopyTest, EmptyBuffer_WritesNothing) { |
| auto result = Copy("Hello", std::span(buffer_, 0)); |
| EXPECT_EQ(0u, result.size()); |
| EXPECT_FALSE(result.ok()); |
| EXPECT_STREQ(kStartingString, buffer_); |
| } |
| |
| TEST_F(CopyTest, TooSmall_Truncates) { |
| auto result = Copy("Hi!", std::span(buffer_, 3)); |
| EXPECT_EQ(2u, result.size()); |
| EXPECT_FALSE(result.ok()); |
| EXPECT_STREQ("Hi", buffer_); |
| } |
| |
| TEST_F(CopyTest, ExactFit) { |
| auto result = Copy("Hi!", std::span(buffer_, 4)); |
| EXPECT_EQ(3u, result.size()); |
| EXPECT_TRUE(result.ok()); |
| EXPECT_STREQ("Hi!", buffer_); |
| } |
| |
| TEST_F(CopyTest, NullTerminatorsInString) { |
| ASSERT_EQ(4u, Copy("\0!\0\0"sv, std::span(buffer_, 5)).size()); |
| EXPECT_EQ("\0!\0\0"sv, std::string_view(buffer_, 4)); |
| } |
| |
| } // namespace |
| } // namespace pw::string |