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//===- llvm/Testing/Support/Error.h ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TESTING_SUPPORT_ERROR_H
#define LLVM_TESTING_SUPPORT_ERROR_H
#include "llvm/Support/Error.h"
#include "llvm/Testing/Support/SupportHelpers.h"
#include "gmock/gmock.h"
#include <ostream>
namespace llvm {
namespace detail {
ErrorHolder TakeError(Error Err);
template <typename T> ExpectedHolder<T> TakeExpected(Expected<T> &Exp) {
return {TakeError(Exp.takeError()), Exp};
}
template <typename T> ExpectedHolder<T> TakeExpected(Expected<T> &&Exp) {
return TakeExpected(Exp);
}
template <typename T>
class ValueMatchesMono
: public testing::MatcherInterface<const ExpectedHolder<T> &> {
public:
explicit ValueMatchesMono(const testing::Matcher<T> &Matcher)
: Matcher(Matcher) {}
bool MatchAndExplain(const ExpectedHolder<T> &Holder,
testing::MatchResultListener *listener) const override {
if (!Holder.Success())
return false;
bool result = Matcher.MatchAndExplain(*Holder.Exp, listener);
if (result || !listener->IsInterested())
return result;
*listener << "(";
Matcher.DescribeNegationTo(listener->stream());
*listener << ")";
return result;
}
void DescribeTo(std::ostream *OS) const override {
*OS << "succeeded with value (";
Matcher.DescribeTo(OS);
*OS << ")";
}
void DescribeNegationTo(std::ostream *OS) const override {
*OS << "did not succeed or value (";
Matcher.DescribeNegationTo(OS);
*OS << ")";
}
private:
testing::Matcher<T> Matcher;
};
template<typename M>
class ValueMatchesPoly {
public:
explicit ValueMatchesPoly(const M &Matcher) : Matcher(Matcher) {}
template <typename T>
operator testing::Matcher<const ExpectedHolder<T> &>() const {
return MakeMatcher(
new ValueMatchesMono<T>(testing::SafeMatcherCast<T>(Matcher)));
}
private:
M Matcher;
};
template <typename InfoT>
class ErrorMatchesMono : public testing::MatcherInterface<const ErrorHolder &> {
public:
explicit ErrorMatchesMono(std::optional<testing::Matcher<InfoT &>> Matcher)
: Matcher(std::move(Matcher)) {}
bool MatchAndExplain(const ErrorHolder &Holder,
testing::MatchResultListener *listener) const override {
if (Holder.Success())
return false;
if (Holder.Infos.size() > 1) {
*listener << "multiple errors";
return false;
}
auto &Info = *Holder.Infos[0];
if (!Info.isA<InfoT>()) {
*listener << "Error was not of given type";
return false;
}
if (!Matcher)
return true;
return Matcher->MatchAndExplain(static_cast<InfoT &>(Info), listener);
}
void DescribeTo(std::ostream *OS) const override {
*OS << "failed with Error of given type";
if (Matcher) {
*OS << " and the error ";
Matcher->DescribeTo(OS);
}
}
void DescribeNegationTo(std::ostream *OS) const override {
*OS << "succeeded or did not fail with the error of given type";
if (Matcher) {
*OS << " or the error ";
Matcher->DescribeNegationTo(OS);
}
}
private:
std::optional<testing::Matcher<InfoT &>> Matcher;
};
class ErrorMessageMatches
: public testing::MatcherInterface<const ErrorHolder &> {
public:
explicit ErrorMessageMatches(
testing::Matcher<std::vector<std::string>> Matcher)
: Matcher(std::move(Matcher)) {}
bool MatchAndExplain(const ErrorHolder &Holder,
testing::MatchResultListener *listener) const override {
std::vector<std::string> Messages;
Messages.reserve(Holder.Infos.size());
for (const std::shared_ptr<ErrorInfoBase> &Info : Holder.Infos)
Messages.push_back(Info->message());
return Matcher.MatchAndExplain(Messages, listener);
}
void DescribeTo(std::ostream *OS) const override {
*OS << "failed with Error whose message ";
Matcher.DescribeTo(OS);
}
void DescribeNegationTo(std::ostream *OS) const override {
*OS << "failed with an Error whose message ";
Matcher.DescribeNegationTo(OS);
}
private:
testing::Matcher<std::vector<std::string>> Matcher;
};
} // namespace detail
#define EXPECT_THAT_ERROR(Err, Matcher) \
EXPECT_THAT(llvm::detail::TakeError(Err), Matcher)
#define ASSERT_THAT_ERROR(Err, Matcher) \
ASSERT_THAT(llvm::detail::TakeError(Err), Matcher)
/// Helper macro for checking the result of an 'Expected<T>'
///
/// @code{.cpp}
/// // function to be tested
/// Expected<int> myDivide(int A, int B);
///
/// TEST(myDivideTests, GoodAndBad) {
/// // test good case
/// // if you only care about success or failure:
/// EXPECT_THAT_EXPECTED(myDivide(10, 5), Succeeded());
/// // if you also care about the value:
/// EXPECT_THAT_EXPECTED(myDivide(10, 5), HasValue(2));
///
/// // test the error case
/// EXPECT_THAT_EXPECTED(myDivide(10, 0), Failed());
/// // also check the error message
/// EXPECT_THAT_EXPECTED(myDivide(10, 0),
/// FailedWithMessage("B must not be zero!"));
/// }
/// @endcode
#define EXPECT_THAT_EXPECTED(Err, Matcher) \
EXPECT_THAT(llvm::detail::TakeExpected(Err), Matcher)
#define ASSERT_THAT_EXPECTED(Err, Matcher) \
ASSERT_THAT(llvm::detail::TakeExpected(Err), Matcher)
MATCHER(Succeeded, "") { return arg.Success(); }
MATCHER(Failed, "") { return !arg.Success(); }
template <typename InfoT>
testing::Matcher<const detail::ErrorHolder &> Failed() {
return MakeMatcher(new detail::ErrorMatchesMono<InfoT>(std::nullopt));
}
template <typename InfoT, typename M>
testing::Matcher<const detail::ErrorHolder &> Failed(M Matcher) {
return MakeMatcher(new detail::ErrorMatchesMono<InfoT>(
testing::SafeMatcherCast<InfoT &>(Matcher)));
}
template <typename... M>
testing::Matcher<const detail::ErrorHolder &> FailedWithMessage(M... Matcher) {
static_assert(sizeof...(M) > 0);
return MakeMatcher(
new detail::ErrorMessageMatches(testing::ElementsAre(Matcher...)));
}
template <typename M>
testing::Matcher<const detail::ErrorHolder &> FailedWithMessageArray(M Matcher) {
return MakeMatcher(new detail::ErrorMessageMatches(Matcher));
}
template <typename M>
detail::ValueMatchesPoly<M> HasValue(M Matcher) {
return detail::ValueMatchesPoly<M>(Matcher);
}
} // namespace llvm
#endif
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