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[FLINK-35490] Migrate tests to JUnit 5 and AssertJ #3742

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This is a sequel PR based on @morazow's great work in #3395.

Currently, there are way too many unit tests and assertion frameworks, including JUnit-4 style Assert, JUnit-5 style Assertions, Hamcrest Matchers, AssertJ fluent assertions. JUnit 4, 5 (Jupier and Vintage) test frameworks are also used altogether, which is prone to mistakes.

Among all these solutions, AssertJ is generally regarded as the most readable and expressive, and used as the assertion standard in many other projects like Apache Iceberg.

This PR migrates all existing test cases to JUnit 5 + AssertJ combination, with an enforced rule defined in spotless style check to forbid using any other testing / asserting frameworks.

@yuxiqian yuxiqian force-pushed the FLINK-35490 branch 4 times, most recently from b746ddd to 2fbac7e Compare January 16, 2025 08:54
@yuxiqian
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yuxiqian commented Jan 20, 2025

Rebased and resolved conflicts again. Maybe we can work on this right after cutting branch to minimize the rebase chore. @leonardBang

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lvyanquan commented Feb 18, 2025

I think it's a good time to complete this(before the open of a large number of other PRs), could @yuxiqian help to resolve the conflict?

@yuxiqian
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Thanks for Kunni's proposal, rebased with master and migrated a few newly added test cases.

<source>8</source>
<target>8</target>
</configuration>
</plugin>
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is it necessary or added by accident?

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Should be an unintentional change, reverted.

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LGTM.

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Hi @leonardBang @ruanhang1993, could you help to check about this?

Signed-off-by: yuxiqian <[email protected]>

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-elasticsearch/pom.xml
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-starrocks/pom.xml
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-db2-cdc/src/test/java/org/apache/flink/cdc/connectors/db2/table/Db2ConnectorITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/table/MongoDBConnectorITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/table/MongoDBRegexFilterITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/table/MySqlConnectorITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-oracle-cdc/src/test/java/org/apache/flink/cdc/connectors/oracle/table/OracleConnectorITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/table/PostgreSQLConnectorITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/table/PostgreSQLSavepointITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-sqlserver-cdc/src/test/java/org/apache/flink/cdc/connectors/sqlserver/table/SqlServerConnectorITCase.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/pom.xml
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/utils/PipelineTestEnvironment.java
#	flink-cdc-e2e-tests/flink-cdc-source-e2e-tests/src/test/java/org/apache/flink/cdc/connectors/tests/utils/FlinkContainerTestEnvironment.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/table/MySqlConnectorITCase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/assigners/state/PendingSplitsStateSerializerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-oceanbase-cdc/src/test/java/org/apache/flink/cdc/connectors/oceanbase/table/OceanBaseMySQLModeITCase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/source/assigner/state/PendingSplitsStateSerializerTest.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/GenericConnectionPoolTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/MySqlChangeEventSourceExampleTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/source/assigner/state/PendingSplitsStateSerializerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/source/meta/split/SourceSplitSerializerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/test/java/org/apache/flink/cdc/connectors/base/testutils/UniqueDatabase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/assigners/state/PendingSplitsStateSerializerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/source/fetch/PostgresScanFetchTaskTest.java
#	flink-cdc-e2e-tests/flink-cdc-source-e2e-tests/src/test/java/org/apache/flink/cdc/connectors/tests/OracleE2eITCase.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/parser/JaninoCompilerTest.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/parser/TransformParserTest.java

# Conflicts:
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/MysqlE2eITCase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlPipelineITCase.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/RouteE2eITCase.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/utils/PipelineTestEnvironment.java
#	flink-cdc-migration-tests/flink-cdc-migration-testcases/src/test/java/org/apache/flink/cdc/migration/tests/SchemaManagerMigrationTest.java
#	flink-cdc-migration-tests/flink-cdc-migration-testcases/src/test/java/org/apache/flink/cdc/migration/tests/SchemaRegistryMigrationTest.java
#	flink-cdc-migration-tests/flink-cdc-migration-testcases/src/test/java/org/apache/flink/cdc/migration/tests/TableChangeInfoMigrationTest.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/operators/schema/coordinator/SchemaDerivationTest.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/operators/schema/regular/SchemaEvolveTest.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/operators/schema/regular/SchemaOperatorTest.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/PaimonMetadataApplierTest.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/v2/PaimonSinkITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-oceanbase-cdc/src/test/java/org/apache/flink/cdc/connectors/oceanbase/table/OceanBaseMySQLModeITCase.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/pom.xml

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/debezium/reader/SnapshotSplitReaderTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlSourceTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/assigners/MySqlHybridSplitAssignerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/assigners/MySqlSnapshotSplitAssignerTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/table/MySqlTableSourceFactoryTest.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/utils/PipelineTestEnvironment.java
#	flink-cdc-pipeline-model/src/test/java/org/apache/flink/cdc/runtime/model/TestOpenAIChatModel.java
#	flink-cdc-pipeline-model/src/test/java/org/apache/flink/cdc/runtime/model/TestOpenAIEmbeddingModel.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-doris/src/test/java/org/apache/flink/cdc/connectors/doris/sink/DorisMetadataApplierITCase.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-elasticsearch/src/test/java/org/apache/flink/cdc/connectors/elasticsearch/sink/ElasticsearchDataSinkFactoryTest.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/v2/PaimonSinkITCase.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-starrocks/src/test/java/org/apache/flink/cdc/connectors/starrocks/sink/StarRocksMetadataApplierITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/source/PostgresSourceITCase.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/MySqlToDorisE2eITCase.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/parser/TransformParserTest.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/serializer/SerializerTestBase.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/serializer/schema/DataTypeSerializerTest.java
#	tools/maven/checkstyle.xml

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-doris/src/test/java/org/apache/flink/cdc/connectors/doris/sink/DorisRowConverterTest.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlDataSourceFactoryTest.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlFullTypesITCase.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlMetadataAccessorITCase.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlPipelineITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/table/MySqlTableSourceFactoryTest.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/LegacyMySqlSourceITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlSourceITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/SpecificStartingOffsetITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxSourceTestBase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/LegacyMongoDBTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/LegacyMySqlTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxSourceTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-oceanbase-cdc/src/test/java/org/apache/flink/cdc/connectors/oceanbase/OceanBaseTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/PostgresTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-sqlserver-cdc/src/test/java/org/apache/flink/cdc/connectors/sqlserver/SqlServerTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-sqlserver-cdc/src/test/java/org/apache/flink/cdc/connectors/sqlserver/source/reader/fetch/SqlServerScanFetchTaskTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-tidb-cdc/src/test/java/org/apache/flink/cdc/connectors/tidb/TiDBTestBase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-vitess-cdc/src/test/java/org/apache/flink/cdc/connectors/vitess/VitessTestBase.java
#	flink-cdc-runtime/src/test/java/org/apache/flink/cdc/runtime/serializer/SerializerTestBase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-db2-cdc/src/test/java/org/apache/flink/cdc/connectors/db2/table/Db2TableSourceFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/table/MongoDBTableFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlSourceITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/source/assigners/MySqlChunkSplitterTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/mysql/table/MySqlTableSourceFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxCharsetITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxSourceITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-oracle-cdc/src/test/java/org/apache/flink/cdc/connectors/oracle/table/OracleTableSourceFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/table/PostgreSQLTableFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-sqlserver-cdc/src/test/java/org/apache/flink/cdc/connectors/sqlserver/table/SqlServerTableFactoryTest.java
#	flink-cdc-e2e-tests/flink-cdc-pipeline-e2e-tests/src/test/java/org/apache/flink/cdc/pipeline/tests/utils/PipelineTestEnvironment.java
#	flink-cdc-e2e-tests/flink-cdc-source-e2e-tests/src/test/java/org/apache/flink/cdc/connectors/tests/utils/FlinkContainerTestEnvironment.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxCharsetITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxSourceITCase.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/test/java/org/apache/flink/cdc/connectors/polardbx/PolardbxSourceTestBase.java

# Conflicts:
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/PaimonHashFunctionTest.java
#	flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-paimon/src/test/java/org/apache/flink/cdc/connectors/paimon/sink/PaimonMetadataApplierTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/table/MongoDBTableFactoryTest.java
#	flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/test/java/org/apache/flink/cdc/connectors/postgres/table/PostgreSQLTableFactoryTest.java
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