Implement EXPECT_STDOUT and EXPECT_STDERR using pipes.
This commit is contained in:
Victor Zverovich
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/*
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Tests of custom Google Test assertions.
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Copyright (c) 2012-2014, Victor Zverovich
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "gtest-extra.h"
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#include <algorithm>
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#include <stdexcept>
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#include <gtest/gtest-spi.h>
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namespace {
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// Tests that assertion macros evaluate their arguments exactly once.
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class SingleEvaluationTest : public ::testing::Test {
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protected:
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SingleEvaluationTest() {
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a_ = 0;
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}
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static int a_;
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};
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int SingleEvaluationTest::a_;
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void ThrowNothing() {}
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void ThrowException() {
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throw std::runtime_error("test");
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}
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// Tests that assertion arguments are evaluated exactly once.
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TEST_F(SingleEvaluationTest, ExceptionTests) {
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// successful EXPECT_THROW_MSG
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EXPECT_THROW_MSG({ // NOLINT
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a_++;
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ThrowException();
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}, std::exception, "test");
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EXPECT_EQ(1, a_);
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// failed EXPECT_THROW_MSG, throws different type
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EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG({ // NOLINT
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a_++;
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ThrowException();
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}, std::logic_error, "test"), "throws a different type");
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EXPECT_EQ(2, a_);
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// failed EXPECT_THROW_MSG, throws an exception with different message
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EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG({ // NOLINT
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a_++;
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ThrowException();
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}, std::exception, "other"), "throws an exception with a different message");
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EXPECT_EQ(3, a_);
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// failed EXPECT_THROW_MSG, throws nothing
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EXPECT_NONFATAL_FAILURE(
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EXPECT_THROW_MSG(a_++, std::exception, "test"), "throws nothing");
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EXPECT_EQ(4, a_);
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}
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// Tests that the compiler will not complain about unreachable code in the
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// EXPECT_THROW_MSG macro.
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TEST(ExpectThrowTest, DoesNotGenerateUnreachableCodeWarning) {
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int n = 0;
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using std::runtime_error;
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EXPECT_THROW_MSG(throw runtime_error(""), runtime_error, "");
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EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(n++, runtime_error, ""), "");
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EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(throw 1, runtime_error, ""), "");
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EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(
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throw runtime_error("a"), runtime_error, "b"), "");
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}
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TEST(AssertionSyntaxTest, ExceptionAssertionsBehavesLikeSingleStatement) {
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if (::testing::internal::AlwaysFalse())
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EXPECT_THROW_MSG(ThrowNothing(), std::exception, "");
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if (::testing::internal::AlwaysTrue())
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EXPECT_THROW_MSG(ThrowException(), std::exception, "test");
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else
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; // NOLINT
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}
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// Tests EXPECT_THROW_MSG.
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TEST(ExpectTest, EXPECT_THROW_MSG) {
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EXPECT_THROW_MSG(ThrowException(), std::exception, "test");
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EXPECT_NONFATAL_FAILURE(
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EXPECT_THROW_MSG(ThrowException(), std::logic_error, "test"),
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"Expected: ThrowException() throws an exception of "
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"type std::logic_error.\n Actual: it throws a different type.");
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EXPECT_NONFATAL_FAILURE(
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EXPECT_THROW_MSG(ThrowNothing(), std::exception, "test"),
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"Expected: ThrowNothing() throws an exception of type std::exception.\n"
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" Actual: it throws nothing.");
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EXPECT_NONFATAL_FAILURE(
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EXPECT_THROW_MSG(ThrowException(), std::exception, "other"),
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"ThrowException() throws an exception with a different message.\n"
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"Expected: other\n"
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" Actual: test");
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}
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TEST(StreamingAssertionsTest, ThrowMsg) {
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EXPECT_THROW_MSG(ThrowException(), std::exception, "test")
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<< "unexpected failure";
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EXPECT_NONFATAL_FAILURE(
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EXPECT_THROW_MSG(ThrowException(), std::exception, "other")
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<< "expected failure", "expected failure");
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}
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#if FMT_USE_FILE_DESCRIPTORS
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TEST(ErrorCodeTest, Ctor) {
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EXPECT_EQ(0, ErrorCode().get());
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EXPECT_EQ(42, ErrorCode(42).get());
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}
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TEST(FileDescriptorTest, DefaultCtor) {
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FileDescriptor fd;
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EXPECT_EQ(-1, fd.get());
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}
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TEST(FileDescriptorTest, OpenFileInCtor) {
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FILE *f = 0;
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{
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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f = fdopen(fd.get(), "r");
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ASSERT_TRUE(f != 0);
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}
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// Make sure fclose is called after the file descriptor is destroyed.
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// Otherwise the destructor will report an error because fclose has
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// already closed the file.
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fclose(f);
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}
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TEST(FileDescriptorTest, OpenFileError) {
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fmt::Writer message;
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fmt::internal::FormatSystemErrorMessage(
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message, ENOENT, "cannot open file nonexistent");
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EXPECT_THROW_MSG(FileDescriptor("nonexistent", FileDescriptor::RDONLY),
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fmt::SystemError, str(message));
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}
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TEST(FileDescriptorTest, MoveCtor) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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int fd_value = fd.get();
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EXPECT_NE(-1, fd_value);
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FileDescriptor fd2(std::move(fd));
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EXPECT_EQ(fd_value, fd2.get());
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EXPECT_EQ(-1, fd.get());
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}
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TEST(FileDescriptorTest, MoveAssignment) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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int fd_value = fd.get();
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EXPECT_NE(-1, fd_value);
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FileDescriptor fd2;
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fd2 = std::move(fd);
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EXPECT_EQ(fd_value, fd2.get());
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EXPECT_EQ(-1, fd.get());
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}
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bool IsClosed(int fd) {
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char buffer[1];
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ssize_t result = read(fd, buffer, sizeof(buffer));
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return result == -1 && errno == EBADF;
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}
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TEST(FileDescriptorTest, MoveAssignmentClosesFile) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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FileDescriptor fd2("CMakeLists.txt", FileDescriptor::RDONLY);
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int old_fd = fd2.get();
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fd2 = std::move(fd);
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EXPECT_TRUE(IsClosed(old_fd));
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}
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FileDescriptor OpenFile(int &fd_value) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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fd_value = fd.get();
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return std::move(fd);
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}
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TEST(FileDescriptorTest, MoveFromTemporaryInCtor) {
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int fd_value = 0xdeadbeef;
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FileDescriptor fd(OpenFile(fd_value));
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EXPECT_EQ(fd_value, fd.get());
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}
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TEST(FileDescriptorTest, MoveFromTemporaryInAssignment) {
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int fd_value = 0xdeadbeef;
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FileDescriptor fd;
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fd = OpenFile(fd_value);
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EXPECT_EQ(fd_value, fd.get());
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}
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TEST(FileDescriptorTest, MoveFromTemporaryInAssignmentClosesFile) {
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int fd_value = 0xdeadbeef;
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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int old_fd = fd.get();
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fd = OpenFile(fd_value);
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EXPECT_TRUE(IsClosed(old_fd));
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}
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TEST(FileDescriptorTest, CloseFileInDtor) {
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int fd_value = 0;
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{
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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fd_value = fd.get();
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}
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FILE *f = fdopen(fd_value, "r");
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int error_code = errno;
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if (f)
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fclose(f);
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EXPECT_TRUE(f == 0);
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EXPECT_EQ(EBADF, error_code);
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}
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TEST(FileDescriptorTest, CloseError) {
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FileDescriptor *fd =
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new FileDescriptor(".travis.yml", FileDescriptor::RDONLY);
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fmt::Writer message;
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fmt::internal::FormatSystemErrorMessage(message, EBADF, "cannot close file");
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EXPECT_STDERR(close(fd->get()); delete fd, str(message) + "\n");
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}
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std::string ReadLine(FileDescriptor &fd) {
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enum { BUFFER_SIZE = 100 };
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char buffer[BUFFER_SIZE];
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ssize_t result = read(fd.get(), buffer, BUFFER_SIZE);
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if (result == -1)
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fmt::ThrowSystemError(errno, "cannot read file");
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buffer[std::min<ssize_t>(BUFFER_SIZE - 1, result)] = '\0';
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if (char *end = strchr(buffer, '\n'))
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*end = '\0';
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return buffer;
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}
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TEST(FileDescriptorTest, Dup) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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FileDescriptor dup = FileDescriptor::dup(fd.get());
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EXPECT_NE(fd.get(), dup.get());
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EXPECT_EQ("language: cpp", ReadLine(dup));
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}
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TEST(FileDescriptorTest, DupError) {
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fmt::Writer message;
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fmt::internal::FormatSystemErrorMessage(
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message, EBADF, "cannot duplicate file descriptor -1");
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EXPECT_THROW_MSG(FileDescriptor::dup(-1), fmt::SystemError, str(message));
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}
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TEST(FileDescriptorTest, Dup2) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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FileDescriptor dup("CMakeLists.txt", FileDescriptor::RDONLY);
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fd.dup2(dup.get());
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EXPECT_NE(fd.get(), dup.get());
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EXPECT_EQ("language: cpp", ReadLine(dup));
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}
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TEST(FileDescriptorTest, Dup2Error) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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fmt::Writer message;
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fmt::internal::FormatSystemErrorMessage(message, EBADF,
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fmt::Format("cannot duplicate file descriptor {} to -1") << fd.get());
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EXPECT_THROW_MSG(fd.dup2(-1), fmt::SystemError, str(message));
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}
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TEST(FileDescriptorTest, Dup2NoExcept) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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FileDescriptor dup("CMakeLists.txt", FileDescriptor::RDONLY);
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ErrorCode ec;
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fd.dup2(dup.get(), ec);
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EXPECT_EQ(0, ec.get());
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EXPECT_NE(fd.get(), dup.get());
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EXPECT_EQ("language: cpp", ReadLine(dup));
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}
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TEST(FileDescriptorTest, Dup2NoExceptError) {
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FileDescriptor fd(".travis.yml", FileDescriptor::RDONLY);
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ErrorCode ec;
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fd.dup2(-1, ec);
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EXPECT_EQ(EBADF, ec.get());
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}
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// TODO: test pipe
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// TODO: compile both with C++11 & C++98 mode
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#endif
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// TODO: test OutputRedirector
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} // namespace
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