Apache Flink Tests

// Test utilities and base classes
import org.apache.flink.test.checkpointing.utils.SnapshotMigrationTestBase;
import org.apache.flink.test.checkpointing.utils.MigrationTestUtils;
import org.apache.flink.test.recovery.SimpleRecoveryITCaseBase;
import org.apache.flink.test.util.JobGraphRunningUtil;

// Test data and operators
import org.apache.flink.test.operators.util.CollectionDataStreams;
import org.apache.flink.runtime.operators.lifecycle.graph.TestJobBuilders;

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-tests</artifactId>
    <version>2.1.0</version>
    <type>test-jar</type>
    <scope>test</scope>
</dependency>

import org.apache.flink.test.checkpointing.utils.SnapshotMigrationTestBase;
import org.apache.flink.test.operators.util.CollectionDataStreams;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.api.java.tuple.Tuple3;

// Example: Using standard test data
public class MyFlinkTest {
    
    @Test
    public void testWithStandardData() throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        
        DataStreamSource<Tuple3<Integer, Long, String>> testData = 
            CollectionDataStreams.get3TupleDataSet(env);
        
        // Use test data in your Flink job
        DataStream<Integer> result = testData
            .map(t -> t.f0)
            .filter(x -> x > 5);
        
        // Add sink and execute
        result.print();
        env.execute("Test Job");
    }
}

// Example: Testing migration scenarios
public class MigrationTest extends SnapshotMigrationTestBase {
    
    @Test
    public void testStateMigration() throws Exception {
        // Create and execute job with state
        JobGraph job = createJobWithOperatorState();
        SnapshotSpec snapshot = executeAndSnapshot(job);
        
        // Restore and validate in new version
        JobGraph restoredJob = createUpdatedJob();
        restoreAndExecute(restoredJob, snapshot);
    }
}

public abstract class SnapshotMigrationTestBase {
    protected SnapshotSpec executeAndSnapshot(JobGraph job) throws Exception;
    protected void restoreAndExecute(JobGraph job, SnapshotSpec snapshot) throws Exception;
    
    public static class SnapshotSpec {
        public String getSnapshotPath();
        public String getSnapshotVersion();
    }
}

public abstract class SimpleRecoveryITCaseBase {
    protected void runAndCancelJob(JobGraph jobGraph) throws Exception;
    
    public static class FailingMapper1 implements MapFunction<Integer, Integer>;
    public static class FailingMapper2 implements MapFunction<Integer, Integer>;
}

public class TestJobBuilders {
    public static final TestJobBuilder SIMPLE_GRAPH_BUILDER;
    public static final TestJobBuilder COMPLEX_GRAPH_BUILDER;
}

public class OneInputTestStreamOperator extends AbstractStreamOperator<TestDataElement> 
    implements OneInputStreamOperator<TestDataElement, TestDataElement>;

public class TestEventQueue {
    public void add(TestEvent event);
    public List<TestEvent> getEvents();
}

public abstract class AbstractOperatorRestoreTestBase {
    protected void testRestore() throws Exception;
}

public abstract class SavepointStateBackendSwitchTestBase {
    protected void testSwitchingStateBackend() throws Exception;
}

public class CollectionDataStreams {
    public static DataSet<Tuple3<Integer, Long, String>> get3TupleDataSet(ExecutionEnvironment env);
    public static DataSet<Tuple3<Integer, Long, String>> getSmall3TupleDataSet(ExecutionEnvironment env);
}

public class JobGraphRunningUtil {
    public static void execute(JobGraph jobGraph, MiniCluster miniCluster) throws Exception;
}

public abstract class CancelingTestBase {
    protected void runAndCancelJob(JobGraph jobGraph, long cancelAfterMs) throws Exception;
}

public class EventGeneratorFactory {
    public static SessionEventGenerator create(SessionConfiguration config);
}

public class SessionEvent {
    public String getSessionId();
    public long getTimestamp();
    public TestEventPayload getPayload();
}

public abstract class PluginTestBase {
    protected void testPluginLoading() throws Exception;
}

public class JobGraphRunningUtil {
    public static void execute(JobGraph jobGraph, MiniCluster miniCluster) throws Exception;
    public static JobExecutionResult executeWithTimeout(JobGraph jobGraph, MiniCluster miniCluster, long timeoutMs) throws Exception;
}

public class TestEnvironmentUtil {
    public static Configuration createTestClusterConfig(int parallelism, int numTaskManagers);
    public static StreamExecutionEnvironment createTestStreamEnv(int parallelism, boolean checkpointingEnabled);
}

// Core test data types
public class CustomType {
    public String myString;
    public int myInt;
    public CustomType(String myString, int myInt);
}

public class POJO {
    public int number;
    public String str;
    public POJO();
    public POJO(int number, String str);
}

public class NestedPojo {
    public POJO nested;
    public long longField;
    public NestedPojo(POJO nested, long longField);
}

public class CrazyNested {
    public NestedPojo nestedPojo;
    public POJO simplePojo;
    public String stringField;
    public CrazyNested(NestedPojo nestedPojo, POJO simplePojo, String stringField);
}

public class PojoWithDateAndEnum {
    public Date dateField;
    public TestEnum enumField;
    public String stringField;
    public PojoWithDateAndEnum(Date dateField, TestEnum enumField, String stringField);
    
    public enum TestEnum { VALUE1, VALUE2, VALUE3 }
}

public class PojoWithCollectionGeneric {
    public List<String> stringList;
    public Map<String, Integer> stringIntMap;
    public Set<Long> longSet;
    public PojoWithCollectionGeneric(List<String> stringList, Map<String, Integer> stringIntMap, Set<Long> longSet);
}

// Fault tolerance types
public class PrefixCount {
    public String prefix;
    public Integer value;
    public Long count;
    public PrefixCount(String prefix, Integer value, Long count);
}

// Migration testing types
public class SnapshotSpec {
    public String getSnapshotPath();
    public String getSnapshotVersion();
}

// Event system types  
public interface TestEvent {
    String getOperatorId();
    long getTimestamp();
}

public class OperatorStartedEvent implements TestEvent;
public class OperatorFinishedEvent implements TestEvent;
public class CheckpointStartedEvent implements TestEvent;
public class CheckpointCompletedEvent implements TestEvent;
public class InputEndedEvent implements TestEvent;
public class WatermarkReceivedEvent implements TestEvent;
public class TestCommandAckEvent implements TestEvent;

// Command system types
public interface TestCommand {
    void execute(StreamOperator<?> operator);
    String getCommandType();
}

public enum TestCommandScope {
    ALL_SUBTASKS, SINGLE_SUBTASK
}

// Test data element
public class TestDataElement {
    public String value;
    public long timestamp;
    public TestDataElement(String value, long timestamp);
}

// Session window testing types
public class SessionEvent {
    public String getSessionId();
    public long getTimestamp();
    public TestEventPayload getPayload();
}

public class TestEventPayload {
    public String data;
    public Map<String, Object> properties;
}

// Enumeration types
public enum FailoverStrategy {
    RestartAllFailoverStrategy,
    RestartPipelinedRegionFailoverStrategy
}

public enum ExecutionMode {
    CREATE_SNAPSHOT,
    VERIFY_SNAPSHOT
}

public enum SnapshotType {
    SAVEPOINT_CANONICAL,
    SAVEPOINT_NATIVE,
    CHECKPOINT
}

// Configuration types
public class SessionConfiguration {
    public long sessionTimeout;
    public long sessionGap;
    public int maxConcurrentSessions;
}

public class TestConfiguration {
    public int parallelism;
    public long checkpointInterval;
    public boolean enableCheckpointing;
}