mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Jon Ross-Perkins
5880954041
This changes to an `Error` return to let the driver do the "error: " prefix, except for one case with `help` that needs more work to change (I'm not planning on picking up that TODO). It also changes capitalization, backtick use, and a few minor punctuation things to try to better match the diagnostic style. This also adds `Error` matchers so that the changes to command line testing are clearer.
112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_COMMON_ERROR_TEST_HELPERS_H_
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#define CARBON_COMMON_ERROR_TEST_HELPERS_H_
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#include <gmock/gmock.h>
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#include "common/error.h"
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namespace Carbon::Testing {
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// Matches the message for an error state of `ErrorOr<T>`. For example:
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// EXPECT_THAT(my_result, IsError(StrEq("error message")));
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class IsError {
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public:
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// NOLINTNEXTLINE(readability-identifier-naming)
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using is_gtest_matcher = void;
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explicit IsError(::testing::Matcher<std::string> matcher)
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: matcher_(std::move(matcher)) {}
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template <typename T>
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auto MatchAndExplain(const ErrorOr<T>& result,
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::testing::MatchResultListener* listener) const -> bool {
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if (result.ok()) {
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*listener->stream() << "is a success";
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return false;
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} else {
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return matcher_.MatchAndExplain(result.error().message(), listener);
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}
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}
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auto DescribeTo(std::ostream* os) const -> void {
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*os << "is an error and matches ";
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matcher_.DescribeTo(os);
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}
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auto DescribeNegationTo(std::ostream* os) const -> void {
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*os << "is a success or does not match ";
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matcher_.DescribeTo(os);
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}
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private:
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::testing::Matcher<std::string> matcher_;
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};
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// Matches the value for a non-error state of `ErrorOr<T>`. For example:
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// EXPECT_THAT(my_result, IsSuccess(Eq(3)));
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template <typename InnerMatcher>
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class IsSuccessMatcher {
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public:
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// NOLINTNEXTLINE(readability-identifier-naming)
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using is_gtest_matcher = void;
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explicit IsSuccessMatcher(InnerMatcher matcher)
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: matcher_(std::move(matcher)) {}
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template <typename T>
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auto MatchAndExplain(const ErrorOr<T>& result,
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::testing::MatchResultListener* listener) const -> bool {
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if (result.ok()) {
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return ::testing::Matcher<T>(matcher_).MatchAndExplain(*result, listener);
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} else {
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*listener->stream() << "is an error with `" << result.error().message()
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<< "`";
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return false;
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}
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}
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auto DescribeTo(std::ostream* os) const -> void {
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*os << "is a success and matches ";
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matcher_.DescribeTo(os);
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}
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auto DescribeNegationTo(std::ostream* os) const -> void {
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*os << "is an error or does not match ";
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matcher_.DescribeTo(os);
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}
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private:
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InnerMatcher matcher_;
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};
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// Wraps `IsSuccessMatcher` for the inner matcher deduction.
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template <typename InnerMatcher>
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auto IsSuccess(InnerMatcher matcher) -> IsSuccessMatcher<InnerMatcher> {
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return IsSuccessMatcher<InnerMatcher>(matcher);
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}
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} // namespace Carbon::Testing
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namespace Carbon {
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// Supports printing `ErrorOr<T>` to `std::ostream` in tests.
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template <typename T>
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auto operator<<(std::ostream& out, const ErrorOr<T>& error_or)
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-> std::ostream& {
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if (error_or.ok()) {
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out << llvm::formatv("ErrorOr{{.value = `{0}`}}", *error_or);
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} else {
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out << llvm::formatv("ErrorOr{{.error = \"{0}\"}}",
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error_or.error().message());
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}
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return out;
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}
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} // namespace Carbon
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#endif // CARBON_COMMON_ERROR_TEST_HELPERS_H_
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