test: cover testSaveMigration
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@@ -156,3 +156,160 @@ VF_TEST(migrationAppliesOneStepPerVersionHop) {
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CHECK_EQ(plan.steps.size(), static_cast<std::size_t>(2));
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CHECK_EQ(plan.steps.size(), static_cast<std::size_t>(2));
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}
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}
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VF_TEST(everyIntermediateVersionIsItselfAValidContainer) {
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SaveContainer original = buildContainer(SaveVersion::V1, 3);
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ByteBuffer legacy = writeSaveContainer(original);
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SaveMigrator migrator;
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SaveScanner scanner;
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for (uint32_t target = 2; target <= 4; ++target) {
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MigrationResult result = migrator.migrate(legacy.data(), legacy.size(),
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static_cast<SaveVersion>(target));
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CHECK(result.ok);
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IntegrityReport report = scanner.scan(result.output);
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CHECK(report.clean());
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CHECK(report.version == static_cast<SaveVersion>(target));
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CHECK_EQ(report.readableChunks, static_cast<std::size_t>(3));
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CHECK(isCanonicalSaveLayout(result.output.data(), result.output.size()));
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}
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}
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VF_TEST(migrationDownwardIsRefusedWithAStatedReason) {
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SaveContainer modern = buildContainer(SaveVersion::V4, 2);
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ByteBuffer buffer = writeSaveContainer(modern);
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SaveMigrator migrator;
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MigrationResult result = migrator.migrate(buffer.data(), buffer.size(), SaveVersion::V2);
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CHECK(!result.ok);
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CHECK(result.output.empty());
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CHECK(result.failure.find("downgrade") != std::string::npos);
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CHECK(result.failure.find("v4 -> v2") != std::string::npos);
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MigrationPlan plan = SaveMigrator::planFor(SaveVersion::V4, SaveVersion::V1);
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CHECK(!plan.possible);
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CHECK(plan.steps.empty());
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CHECK(!plan.refusal.empty());
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}
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VF_TEST(migrationToTheSameVersionCopiesTheBufferVerbatim) {
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SaveContainer modern = buildContainer(SaveVersion::V4, 3);
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ByteBuffer buffer = writeSaveContainer(modern);
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SaveMigrator migrator;
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MigrationResult result = migrator.migrate(buffer.data(), buffer.size(), SaveVersion::V4);
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CHECK(result.ok);
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CHECK(result.applied.empty());
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CHECK(result.output == buffer);
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}
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VF_TEST(fieldsAddedByAMigrationGetTheirDocumentedDefaults) {
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SaveContainer original = buildContainer(SaveVersion::V2, 2);
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ByteBuffer buffer = writeSaveContainer(original);
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SaveMigrator migrator;
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MigrationResult toV3 = migrator.migrate(buffer.data(), buffer.size(), SaveVersion::V3);
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CHECK(toV3.ok);
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SaveContainer lit;
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CHECK(readSaveContainer(toV3.output.data(), toV3.output.size(), lit));
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for (const SaveChunkRecord& record : lit.chunks) {
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CHECK_EQ(record.light.size(), static_cast<std::size_t>(chunkVolume));
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CHECK(record.light == defaultChunkLight(record.blocks, saveDefaultSkyLight));
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}
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MigrationResult toV4 = migrator.migrate(buffer.data(), buffer.size(), SaveVersion::V4);
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CHECK(toV4.ok);
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SaveContainer stamped;
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CHECK(readSaveContainer(toV4.output.data(), toV4.output.size(), stamped));
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for (const SaveChunkRecord& record : stamped.chunks) {
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CHECK_EQ(record.meta.inhabitedTicks, static_cast<uint64_t>(0));
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CHECK_EQ(record.meta.lastSavedTick, static_cast<uint64_t>(0));
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CHECK_EQ(record.meta.generationStage, saveStageComplete);
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}
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}
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VF_TEST(migrationCountsTheFieldsEachStepCreated) {
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SaveContainer original = buildContainer(SaveVersion::V1, 3);
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ByteBuffer legacy = writeSaveContainer(original);
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std::size_t expectedPaletteEntries = 0;
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for (const SaveChunkRecord& record : original.chunks)
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expectedPaletteEntries += distinctBlocks(record.blocks);
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SaveMigrator migrator;
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MigrationResult result = migrator.migrateToCurrent(legacy);
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CHECK(result.ok);
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CHECK_EQ(result.paletteEntriesCreated, expectedPaletteEntries);
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CHECK_EQ(result.lightCellsInitialized, static_cast<std::size_t>(3 * chunkVolume));
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CHECK_EQ(result.metadataRecordsCreated, static_cast<std::size_t>(3));
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}
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VF_TEST(migratorHonoursItsConfiguredDefaults) {
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SaveContainer original = buildContainer(SaveVersion::V2, 2);
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ByteBuffer buffer = writeSaveContainer(original);
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SaveMigrator migrator;
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migrator.skyLightForNewPlanes = 7;
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migrator.metadataDefaults.inhabitedTicks = 1234;
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migrator.metadataDefaults.lastSavedTick = 9999;
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migrator.metadataDefaults.generationStage = 1;
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MigrationResult result = migrator.migrateToCurrent(buffer);
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CHECK(result.ok);
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SaveContainer lifted;
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CHECK(readSaveContainer(result.output.data(), result.output.size(), lifted));
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for (const SaveChunkRecord& record : lifted.chunks) {
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CHECK(record.light == defaultChunkLight(record.blocks, 7));
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CHECK_EQ(record.meta.inhabitedTicks, static_cast<uint64_t>(1234));
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CHECK_EQ(record.meta.lastSavedTick, static_cast<uint64_t>(9999));
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CHECK_EQ(record.meta.generationStage, static_cast<uint8_t>(1));
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}
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}
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VF_TEST(migratorCanCompressTheFinalHopAndStillReadItBack) {
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SaveContainer original = buildContainer(SaveVersion::V1, 3);
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ByteBuffer legacy = writeSaveContainer(original);
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SaveMigrator plain;
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MigrationResult loose = plain.migrateToCurrent(legacy);
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CHECK(loose.ok);
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SaveMigrator packing;
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packing.compressMigratedPayloads = true;
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MigrationResult tight = packing.migrateToCurrent(legacy);
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CHECK(tight.ok);
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CHECK(tight.output.size() < loose.output.size());
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SaveContainer reloaded;
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CHECK(readSaveContainer(tight.output.data(), tight.output.size(), reloaded));
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CHECK(reloaded.compressPayloads);
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for (const SaveChunkRecord& before : original.chunks) {
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const SaveChunkRecord* after = reloaded.find(before.coord);
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CHECK(after != nullptr);
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if (after != nullptr) CHECK(sameBlocks(before.blocks, after->blocks));
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}
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SaveScanner scanner;
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CHECK(scanner.scan(tight.output).clean());
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}
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VF_TEST(migrationRefusesAHeaderItCannotIdentify) {
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SaveContainer original = buildContainer(SaveVersion::V1, 2);
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ByteBuffer buffer = writeSaveContainer(original);
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saveWriteU32At(buffer.data(), buffer.size(), 4, 7u);
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SaveMigrator migrator;
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MigrationResult result = migrator.migrateToCurrent(buffer);
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CHECK(!result.ok);
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CHECK(result.output.empty());
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CHECK(result.failure.find("header") != std::string::npos);
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ByteBuffer stump(20, 0);
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MigrationResult tiny = migrator.migrateToCurrent(stump);
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CHECK(!tiny.ok);
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}
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VF_TEST(peekVersionReadsTheHeaderWithoutTheBody) {
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SaveContainer original = buildContainer(SaveVersion::V3, 2);
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ByteBuffer buffer = writeSaveContainer(original);
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ByteBuffer headerOnly(buffer.begin(), buffer.begin() + saveHeaderBytes);
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