c-resources/CPlusPlus20ForProgrammers-m.../examples/libraries/fmt/test/gtest-extra-test.cc

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C++

// Formatting library for C++ - tests of custom Google Test assertions
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
#include "gtest-extra.h"
#include <gtest/gtest-spi.h>
#include <cstring>
#include <memory>
#include <stdexcept>
#include "fmt/os.h"
#include "util.h"
// Tests that assertion macros evaluate their arguments exactly once.
namespace {
class single_evaluation_test : public ::testing::Test {
protected:
single_evaluation_test() {
p_ = s_;
a_ = 0;
b_ = 0;
}
static const char* const s_;
static const char* p_;
static int a_;
static int b_;
};
} // namespace
const char* const single_evaluation_test::s_ = "01234";
const char* single_evaluation_test::p_;
int single_evaluation_test::a_;
int single_evaluation_test::b_;
void do_nothing() {}
FMT_NORETURN void throw_exception() { throw std::runtime_error("test"); }
FMT_NORETURN void throw_system_error() {
throw fmt::system_error(EDOM, "test");
}
// Tests that when EXPECT_THROW_MSG fails, it evaluates its message argument
// exactly once.
TEST_F(single_evaluation_test, failed_expect_throw_msg) {
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(throw_exception(), std::exception, p_++), "01234");
EXPECT_EQ(s_ + 1, p_);
}
// Tests that when EXPECT_SYSTEM_ERROR fails, it evaluates its message argument
// exactly once.
TEST_F(single_evaluation_test, failed_expect_system_error) {
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, p_++),
"01234");
EXPECT_EQ(s_ + 1, p_);
}
// Tests that assertion arguments are evaluated exactly once.
TEST_F(single_evaluation_test, exception_tests) {
// successful EXPECT_THROW_MSG
EXPECT_THROW_MSG(
{ // NOLINT
a_++;
throw_exception();
},
std::exception, (b_++, "test"));
EXPECT_EQ(1, a_);
EXPECT_EQ(1, b_);
// failed EXPECT_THROW_MSG, throws different type
EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(
{ // NOLINT
a_++;
throw_exception();
},
std::logic_error, (b_++, "test")),
"throws a different type");
EXPECT_EQ(2, a_);
EXPECT_EQ(2, b_);
// failed EXPECT_THROW_MSG, throws an exception with different message
EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(
{ // NOLINT
a_++;
throw_exception();
},
std::exception, (b_++, "other")),
"throws an exception with a different message");
EXPECT_EQ(3, a_);
EXPECT_EQ(3, b_);
// failed EXPECT_THROW_MSG, throws nothing
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(a_++, std::exception, (b_++, "test")), "throws nothing");
EXPECT_EQ(4, a_);
EXPECT_EQ(4, b_);
}
TEST_F(single_evaluation_test, system_error_tests) {
// successful EXPECT_SYSTEM_ERROR
EXPECT_SYSTEM_ERROR(
{ // NOLINT
a_++;
throw_system_error();
},
EDOM, (b_++, "test"));
EXPECT_EQ(1, a_);
EXPECT_EQ(1, b_);
// failed EXPECT_SYSTEM_ERROR, throws different type
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(
{ // NOLINT
a_++;
throw_exception();
},
EDOM, (b_++, "test")),
"throws a different type");
EXPECT_EQ(2, a_);
EXPECT_EQ(2, b_);
// failed EXPECT_SYSTEM_ERROR, throws an exception with different message
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(
{ // NOLINT
a_++;
throw_system_error();
},
EDOM, (b_++, "other")),
"throws an exception with a different message");
EXPECT_EQ(3, a_);
EXPECT_EQ(3, b_);
// failed EXPECT_SYSTEM_ERROR, throws nothing
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(a_++, EDOM, (b_++, "test")),
"throws nothing");
EXPECT_EQ(4, a_);
EXPECT_EQ(4, b_);
}
#if FMT_USE_FCNTL
// Tests that when EXPECT_WRITE fails, it evaluates its message argument
// exactly once.
TEST_F(single_evaluation_test, failed_expect_write) {
EXPECT_NONFATAL_FAILURE(EXPECT_WRITE(stdout, std::printf("test"), p_++),
"01234");
EXPECT_EQ(s_ + 1, p_);
}
// Tests that assertion arguments are evaluated exactly once.
TEST_F(single_evaluation_test, write_tests) {
// successful EXPECT_WRITE
EXPECT_WRITE(
stdout,
{ // NOLINT
a_++;
std::printf("test");
},
(b_++, "test"));
EXPECT_EQ(1, a_);
EXPECT_EQ(1, b_);
// failed EXPECT_WRITE
EXPECT_NONFATAL_FAILURE(EXPECT_WRITE(
stdout,
{ // NOLINT
a_++;
std::printf("test");
},
(b_++, "other")),
"Actual: test");
EXPECT_EQ(2, a_);
EXPECT_EQ(2, b_);
}
// Tests EXPECT_WRITE.
TEST(gtest_extra_test, expect_write) {
EXPECT_WRITE(stdout, do_nothing(), "");
EXPECT_WRITE(stdout, std::printf("test"), "test");
EXPECT_WRITE(stderr, std::fprintf(stderr, "test"), "test");
EXPECT_NONFATAL_FAILURE(EXPECT_WRITE(stdout, std::printf("that"), "this"),
"Expected: this\n"
" Actual: that");
}
TEST(gtest_extra_test, expect_write_streaming) {
EXPECT_WRITE(stdout, std::printf("test"), "test") << "unexpected failure";
EXPECT_NONFATAL_FAILURE(EXPECT_WRITE(stdout, std::printf("test"), "other")
<< "expected failure",
"expected failure");
}
#endif // FMT_USE_FCNTL
// Tests that the compiler will not complain about unreachable code in the
// EXPECT_THROW_MSG macro.
TEST(gtest_extra_test, expect_throw_no_unreachable_code_warning) {
int n = 0;
using std::runtime_error;
EXPECT_THROW_MSG(throw runtime_error(""), runtime_error, "");
EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(n++, runtime_error, ""), "");
EXPECT_NONFATAL_FAILURE(EXPECT_THROW_MSG(throw 1, runtime_error, ""), "");
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(throw runtime_error("a"), runtime_error, "b"), "");
}
// Tests that the compiler will not complain about unreachable code in the
// EXPECT_SYSTEM_ERROR macro.
TEST(gtest_extra_test, expect_system_error_no_unreachable_code_warning) {
int n = 0;
EXPECT_SYSTEM_ERROR(throw fmt::system_error(EDOM, "test"), EDOM, "test");
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(n++, EDOM, ""), "");
EXPECT_NONFATAL_FAILURE(EXPECT_SYSTEM_ERROR(throw 1, EDOM, ""), "");
EXPECT_NONFATAL_FAILURE(
EXPECT_SYSTEM_ERROR(throw fmt::system_error(EDOM, "aaa"), EDOM, "bbb"),
"");
}
TEST(gtest_extra_test, expect_throw_behaves_like_single_statement) {
if (::testing::internal::AlwaysFalse())
EXPECT_THROW_MSG(do_nothing(), std::exception, "");
if (::testing::internal::AlwaysTrue())
EXPECT_THROW_MSG(throw_exception(), std::exception, "test");
else
do_nothing();
}
TEST(gtest_extra_test, expect_system_error_behaves_like_single_statement) {
if (::testing::internal::AlwaysFalse())
EXPECT_SYSTEM_ERROR(do_nothing(), EDOM, "");
if (::testing::internal::AlwaysTrue())
EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, "test");
else
do_nothing();
}
TEST(gtest_extra_test, expect_write_behaves_like_single_statement) {
if (::testing::internal::AlwaysFalse())
EXPECT_WRITE(stdout, std::printf("x"), "x");
if (::testing::internal::AlwaysTrue())
EXPECT_WRITE(stdout, std::printf("x"), "x");
else
do_nothing();
}
// Tests EXPECT_THROW_MSG.
TEST(gtest_extra_test, expect_throw_msg) {
EXPECT_THROW_MSG(throw_exception(), std::exception, "test");
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(throw_exception(), std::logic_error, "test"),
"Expected: throw_exception() throws an exception of "
"type std::logic_error.\n Actual: it throws a different type.");
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(do_nothing(), std::exception, "test"),
"Expected: do_nothing() throws an exception of type std::exception.\n"
" Actual: it throws nothing.");
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(throw_exception(), std::exception, "other"),
"throw_exception() throws an exception with a different message.\n"
"Expected: other\n"
" Actual: test");
}
// Tests EXPECT_SYSTEM_ERROR.
TEST(gtest_extra_test, expect_system_error) {
EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, "test");
EXPECT_NONFATAL_FAILURE(
EXPECT_SYSTEM_ERROR(throw_exception(), EDOM, "test"),
"Expected: throw_exception() throws an exception of "
"type std::system_error.\n Actual: it throws a different type.");
EXPECT_NONFATAL_FAILURE(
EXPECT_SYSTEM_ERROR(do_nothing(), EDOM, "test"),
"Expected: do_nothing() throws an exception of type std::system_error.\n"
" Actual: it throws nothing.");
EXPECT_NONFATAL_FAILURE(
EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, "other"),
fmt::format(
"throw_system_error() throws an exception with a different message.\n"
"Expected: {}\n"
" Actual: {}",
system_error_message(EDOM, "other"),
system_error_message(EDOM, "test")));
}
TEST(gtest_extra_test, expect_throw_msg_streaming) {
EXPECT_THROW_MSG(throw_exception(), std::exception, "test")
<< "unexpected failure";
EXPECT_NONFATAL_FAILURE(
EXPECT_THROW_MSG(throw_exception(), std::exception, "other")
<< "expected failure",
"expected failure");
}
TEST(gtest_extra_test, expect_system_error_streaming) {
EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, "test")
<< "unexpected failure";
EXPECT_NONFATAL_FAILURE(
EXPECT_SYSTEM_ERROR(throw_system_error(), EDOM, "other")
<< "expected failure",
"expected failure");
}
#if FMT_USE_FCNTL
using fmt::buffered_file;
using fmt::file;
TEST(output_redirect_test, scoped_redirect) {
file read_end, write_end;
file::pipe(read_end, write_end);
{
buffered_file file(write_end.fdopen("w"));
std::fprintf(file.get(), "[[[");
{
output_redirect redir(file.get());
std::fprintf(file.get(), "censored");
}
std::fprintf(file.get(), "]]]");
}
EXPECT_READ(read_end, "[[[]]]");
}
// Test that output_redirect handles errors in flush correctly.
TEST(output_redirect_test, flush_error_in_ctor) {
file read_end, write_end;
file::pipe(read_end, write_end);
int write_fd = write_end.descriptor();
file write_copy = write_end.dup(write_fd);
buffered_file f = write_end.fdopen("w");
// Put a character in a file buffer.
EXPECT_EQ('x', fputc('x', f.get()));
FMT_POSIX(close(write_fd));
std::unique_ptr<output_redirect> redir{nullptr};
EXPECT_SYSTEM_ERROR_NOASSERT(redir.reset(new output_redirect(f.get())), EBADF,
"cannot flush stream");
redir.reset(nullptr);
write_copy.dup2(write_fd); // "undo" close or dtor will fail
}
TEST(output_redirect_test, dup_error_in_ctor) {
buffered_file f = open_buffered_file();
int fd = (f.fileno)();
file copy = file::dup(fd);
FMT_POSIX(close(fd));
std::unique_ptr<output_redirect> redir{nullptr};
EXPECT_SYSTEM_ERROR_NOASSERT(
redir.reset(new output_redirect(f.get())), EBADF,
fmt::format("cannot duplicate file descriptor {}", fd));
copy.dup2(fd); // "undo" close or dtor will fail
}
TEST(output_redirect_test, restore_and_read) {
file read_end, write_end;
file::pipe(read_end, write_end);
buffered_file file(write_end.fdopen("w"));
std::fprintf(file.get(), "[[[");
output_redirect redir(file.get());
std::fprintf(file.get(), "censored");
EXPECT_EQ("censored", redir.restore_and_read());
EXPECT_EQ("", redir.restore_and_read());
std::fprintf(file.get(), "]]]");
file = buffered_file();
EXPECT_READ(read_end, "[[[]]]");
}
// Test that OutputRedirect handles errors in flush correctly.
TEST(output_redirect_test, flush_error_in_restore_and_read) {
file read_end, write_end;
file::pipe(read_end, write_end);
int write_fd = write_end.descriptor();
file write_copy = write_end.dup(write_fd);
buffered_file f = write_end.fdopen("w");
output_redirect redir(f.get());
// Put a character in a file buffer.
EXPECT_EQ('x', fputc('x', f.get()));
FMT_POSIX(close(write_fd));
EXPECT_SYSTEM_ERROR_NOASSERT(redir.restore_and_read(), EBADF,
"cannot flush stream");
write_copy.dup2(write_fd); // "undo" close or dtor will fail
}
TEST(output_redirect_test, error_in_dtor) {
file read_end, write_end;
file::pipe(read_end, write_end);
int write_fd = write_end.descriptor();
file write_copy = write_end.dup(write_fd);
buffered_file f = write_end.fdopen("w");
std::unique_ptr<output_redirect> redir(new output_redirect(f.get()));
// Put a character in a file buffer.
EXPECT_EQ('x', fputc('x', f.get()));
EXPECT_WRITE(
stderr,
{
// The close function must be called inside EXPECT_WRITE,
// otherwise the system may recycle closed file descriptor when
// redirecting the output in EXPECT_STDERR and the second close
// will break output redirection.
FMT_POSIX(close(write_fd));
SUPPRESS_ASSERT(redir.reset(nullptr));
},
system_error_message(EBADF, "cannot flush stream"));
write_copy.dup2(write_fd); // "undo" close or dtor of buffered_file will fail
}
#endif // FMT_USE_FCNTL