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// Copyright (c) 2026 Progmasoft.
// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-1.1
#include <Progmasoft/Catch3.hpp>
#include <atomic>
#include <chrono>
#include <filesystem>
#include <fstream>
#include <string>
#include <system_error>
namespace {
class TemporarySnapshotDirectory final {
public:
TemporarySnapshotDirectory() {
static std::atomic<unsigned long long> nextId{ 0 };
const auto timestamp =
std::chrono::steady_clock::now().time_since_epoch().count();
Path = std::filesystem::temp_directory_path() /
( "progmasoft-catch3-snapshot-" +
std::to_string( timestamp ) + "-" +
std::to_string(
nextId.fetch_add( 1, std::memory_order_relaxed ) ) );
std::filesystem::create_directories( Path );
}
~TemporarySnapshotDirectory() {
std::error_code ignored;
std::filesystem::remove_all( Path, ignored );
}
std::filesystem::path Path;
};
} // namespace
TEST_CASE( "Snapshot comparison does not write during ordinary runs",
"[progmasoft][snapshot]" ) {
using Progmasoft::Catch3::CompareSnapshot;
using Progmasoft::Catch3::SnapshotOptions;
using Progmasoft::Catch3::SnapshotStatus;
const TemporarySnapshotDirectory directory;
const auto result = CompareSnapshot("greeting", "hello\nworld\n", [&] {
SnapshotOptions made;
made.Directory = directory.Path;
return made;
}());
CHECK( result.Status == SnapshotStatus::kMismatched );
CHECK_FALSE( result.Succeeded() );
CHECK( result.DifferenceLine == 1 );
CHECK( result.DifferenceColumn == 1 );
CHECK_FALSE( std::filesystem::exists( result.File ) );
}
TEST_CASE( "Snapshots normalize line endings and report precise differences",
"[progmasoft][snapshot]" ) {
using Progmasoft::Catch3::CompareSnapshot;
using Progmasoft::Catch3::SnapshotOptions;
using Progmasoft::Catch3::SnapshotStatus;
using Progmasoft::Catch3::SnapshotUpdateMode;
const TemporarySnapshotDirectory directory;
const SnapshotOptions createOptions = [&] {
SnapshotOptions made;
made.Directory = directory.Path;
made.UpdateMode = SnapshotUpdateMode::kCreateMissing;
return made;
}();
const auto created =
CompareSnapshot( "multiline", "one\ntwo\n", createOptions );
REQUIRE( created.Status == SnapshotStatus::kCreated );
CHECK( created.Succeeded() );
const auto normalized =
CompareSnapshot( "multiline", "one\r\ntwo\r\n", createOptions );
CHECK( normalized.Status == SnapshotStatus::kMatched );
CHECK( normalized.Expected == "one\ntwo\n" );
const auto mismatch = CompareSnapshot("multiline", "one\ntoo\n", [&] {
SnapshotOptions made;
made.Directory = directory.Path;
return made;
}());
CHECK( mismatch.Status == SnapshotStatus::kMismatched );
CHECK( mismatch.DifferenceLine == 2 );
CHECK( mismatch.DifferenceColumn == 2 );
CHECK( mismatch.Message.find( "line 2, column 2" ) != std::string::npos );
}
TEST_CASE( "Snapshot creation and replacement require explicit update modes",
"[progmasoft][snapshot]" ) {
using Progmasoft::Catch3::CompareSnapshot;
using Progmasoft::Catch3::SnapshotOptions;
using Progmasoft::Catch3::SnapshotStatus;
using Progmasoft::Catch3::SnapshotUpdateMode;
const TemporarySnapshotDirectory directory;
const SnapshotOptions createMissing = [&] {
SnapshotOptions made;
made.Directory = directory.Path;
made.UpdateMode = SnapshotUpdateMode::kCreateMissing;
return made;
}();
REQUIRE( CompareSnapshot( "answer", "first", createMissing ).Succeeded() );
const auto protectedMismatch =
CompareSnapshot( "answer", "second", createMissing );
CHECK( protectedMismatch.Status == SnapshotStatus::kMismatched );
CHECK( protectedMismatch.Expected == "first" );
const SnapshotOptions updateEverything = [&] {
SnapshotOptions made;
made.Directory = directory.Path;
made.UpdateMode = SnapshotUpdateMode::kAlways;
return made;
}();
const auto updated =
CompareSnapshot( "answer", "second", updateEverything );
REQUIRE( updated.Status == SnapshotStatus::kUpdated );
CHECK( updated.Expected == "first" );
CHECK( updated.Actual == "second" );
CHECK( CompareSnapshot( "answer", "second", createMissing ).Succeeded() );
}
TEST_CASE( "Snapshot names and I/O failures are returned as structured errors",
"[progmasoft][snapshot]" ) {
using Progmasoft::Catch3::CompareSnapshot;
using Progmasoft::Catch3::SnapshotOptions;
using Progmasoft::Catch3::SnapshotStatus;
using Progmasoft::Catch3::SnapshotUpdateMode;
const TemporarySnapshotDirectory directory;
const SnapshotOptions options = [&] {
SnapshotOptions made;
made.Directory = directory.Path;
return made;
}();
CHECK( CompareSnapshot( "../outside", "text", options ).Status ==
SnapshotStatus::kInvalidName );
CHECK( CompareSnapshot( "nested/name", "text", options ).Status ==
SnapshotStatus::kInvalidName );
CHECK( CompareSnapshot( "", "text", options ).Status ==
SnapshotStatus::kInvalidName );
CHECK( CompareSnapshot( "valid", "text", SnapshotOptions{} ).Status ==
SnapshotStatus::kInvalidOptions );
const auto blockingFile = directory.Path / "not-a-directory";
{
std::ofstream output( blockingFile, std::ios::binary );
REQUIRE( output.good() );
output << "file";
}
const auto ioFailure = CompareSnapshot("snapshot", "text", [&] {
SnapshotOptions made;
made.Directory = blockingFile;
made.UpdateMode = SnapshotUpdateMode::kCreateMissing;
return made;
}());
CHECK( ioFailure.Status == SnapshotStatus::kIoError );
CHECK_FALSE( ioFailure.Message.empty() );
}
TEST_CASE( "Snapshot assertion macro reports successful explicit updates",
"[progmasoft][snapshot]" ) {
const TemporarySnapshotDirectory directory;
CATCH3_CHECK_SNAPSHOT(
"macro",
"stable value",
([&] {
Progmasoft::Catch3::SnapshotOptions made;
made.Directory = directory.Path;
made.UpdateMode
= Progmasoft::Catch3::SnapshotUpdateMode::kCreateMissing;
return made;
}()));
}
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