chore: use Junit5 in java core

gapic-generator-java-pom-parent/pom.xml

@@ -37,6 +37,7 @@
     <errorprone.version>2.27.1</errorprone.version>
     <j2objc-annotations.version>3.0.0</j2objc-annotations.version>
     <threetenbp.version>1.6.9</threetenbp.version>
+    <junit.version>5.10.2</junit.version>
   </properties>
 
   <developers>

java-core/google-cloud-core-grpc/pom.xml

@@ -56,8 +56,18 @@
     </dependency>
 
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
+      <groupId>org.junit.platform</groupId>
+      <artifactId>junit-platform-launcher</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.vintage</groupId>
+      <artifactId>junit-vintage-engine</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>

java-core/google-cloud-core-grpc/src/test/java/com/google/cloud/grpc/BaseGrpcServiceExceptionTest.java

@@ -20,10 +20,10 @@
 import static org.easymock.EasyMock.expect;
 import static org.easymock.EasyMock.replay;
 import static org.easymock.EasyMock.verify;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.api.gax.grpc.GrpcStatusCode;
 import com.google.api.gax.rpc.InternalException;
@@ -33,16 +33,16 @@
 import java.io.IOException;
 import java.net.SocketException;
 import java.net.SocketTimeoutException;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class BaseGrpcServiceExceptionTest {
+class BaseGrpcServiceExceptionTest {
 
   private static final String MESSAGE = "some message";
   private static final boolean NOT_RETRYABLE = false;
   private static final boolean IDEMPOTENT = true;
 
   @Test
-  public void testBaseServiceException() {
+  void testBaseServiceException() {
     BaseGrpcServiceException serviceException = null;
 
     IOException exception = new SocketTimeoutException();
@@ -86,7 +86,7 @@ public void testBaseServiceException() {
   }
 
   @Test
-  public void testTranslateAndThrow() throws Exception {
+  void testTranslateAndThrow() throws Exception {
     IOException exception = new SocketTimeoutException();
     BaseGrpcServiceException cause = new BaseGrpcServiceException(exception, IDEMPOTENT);
     RetryHelper.RetryHelperException exceptionMock =

java-core/google-cloud-core-grpc/src/test/java/com/google/cloud/grpc/GrpcTransportOptionsTest.java

@@ -16,18 +16,18 @@
 
 package com.google.cloud.grpc;
 
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNotEquals;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.cloud.grpc.GrpcTransportOptions.DefaultExecutorFactory;
 import com.google.cloud.grpc.GrpcTransportOptions.ExecutorFactory;
 import java.util.concurrent.ScheduledExecutorService;
 import org.easymock.EasyMock;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class GrpcTransportOptionsTest {
+class GrpcTransportOptionsTest {
 
   private static final ExecutorFactory MOCK_EXECUTOR_FACTORY =
       EasyMock.createMock(ExecutorFactory.class);
@@ -38,13 +38,13 @@ public class GrpcTransportOptionsTest {
   private static final GrpcTransportOptions OPTIONS_COPY = OPTIONS.toBuilder().build();
 
   @Test
-  public void testBuilder() {
+  void testBuilder() {
     assertSame(MOCK_EXECUTOR_FACTORY, OPTIONS.getExecutorFactory());
     assertTrue(DEFAULT_OPTIONS.getExecutorFactory() instanceof DefaultExecutorFactory);
   }
 
   @Test
-  public void testBaseEquals() {
+  void testBaseEquals() {
     assertEquals(OPTIONS, OPTIONS_COPY);
     assertNotEquals(DEFAULT_OPTIONS, OPTIONS);
     GrpcTransportOptions options =
@@ -53,7 +53,7 @@ public void testBaseEquals() {
   }
 
   @Test
-  public void testBaseHashCode() {
+  void testBaseHashCode() {
     assertEquals(OPTIONS.hashCode(), OPTIONS_COPY.hashCode());
     assertNotEquals(DEFAULT_OPTIONS.hashCode(), OPTIONS.hashCode());
     GrpcTransportOptions options =
@@ -62,7 +62,7 @@ public void testBaseHashCode() {
   }
 
   @Test
-  public void testDefaultExecutorFactory() {
+  void testDefaultExecutorFactory() {
     ExecutorFactory<ScheduledExecutorService> executorFactory = new DefaultExecutorFactory();
     ScheduledExecutorService executorService = executorFactory.get();
     assertSame(executorService, executorFactory.get());

java-core/google-cloud-core-grpc/src/test/java/com/google/cloud/grpc/SharedResourceHolderTest.java

@@ -16,8 +16,19 @@
 
 package com.google.cloud.grpc;
 
-import static org.easymock.EasyMock.*;
-import static org.junit.Assert.*;
+import static org.easymock.EasyMock.anyLong;
+import static org.easymock.EasyMock.anyObject;
+import static org.easymock.EasyMock.createNiceMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.replay;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import java.util.LinkedList;
 import java.util.concurrent.Delayed;
@@ -26,20 +37,17 @@
 import java.util.concurrent.TimeUnit;
 import org.easymock.EasyMock;
 import org.easymock.IAnswer;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 /**
  * This class was copied from grpc-core to prevent dependence on an unstable API that may be subject
- * to changes
- * (https://github.com/grpc/grpc-java/blob/d07ecbe037d2705a1c9f4b6345581f860e505b56/core/src/test/java/io/grpc/internal/SharedResourceHolderTest.java)
+ * to changes (<a
+ * href="https://github.com/grpc/grpc-java/blob/d07ecbe037d2705a1c9f4b6345581f860e505b56/core/src/test/java/io/grpc/internal/SharedResourceHolderTest.java">SharedResourceHolderTest</a>)
  *
  * <p>Unit tests for {@link SharedResourceHolder}.
  */
-@RunWith(JUnit4.class)
-public class SharedResourceHolderTest {
+class SharedResourceHolderTest {
 
   private final LinkedList<MockScheduledFuture<?>> scheduledDestroyTasks = new LinkedList<>();
 
@@ -67,13 +75,13 @@ public void close(ResourceInstance instance) {
   private static final SharedResourceHolder.Resource<ResourceInstance> SHARED_BAR =
       new ResourceFactory();
 
-  @Before
-  public void setUp() {
+  @BeforeEach
+  void setUp() {
     holder = new SharedResourceHolder(new MockExecutorFactory());
   }
 
   @Test
-  public void destroyResourceWhenRefCountReachesZero() {
+  void destroyResourceWhenRefCountReachesZero() {
     ResourceInstance foo1 = holder.getInternal(SHARED_FOO);
     ResourceInstance sharedFoo = foo1;
     ResourceInstance foo2 = holder.getInternal(SHARED_FOO);
@@ -121,7 +129,7 @@ public void destroyResourceWhenRefCountReachesZero() {
   }
 
   @Test
-  public void cancelDestroyTask() {
+  void cancelDestroyTask() {
     ResourceInstance foo1 = holder.getInternal(SHARED_FOO);
     ResourceInstance sharedFoo = foo1;
     holder.releaseInternal(SHARED_FOO, foo1);
@@ -148,7 +156,7 @@ public void cancelDestroyTask() {
   }
 
   @Test
-  public void releaseWrongInstance() {
+  void releaseWrongInstance() {
     ResourceInstance uncached = new ResourceInstance();
     try {
       holder.releaseInternal(SHARED_FOO, uncached);
@@ -167,7 +175,7 @@ public void releaseWrongInstance() {
   }
 
   @Test
-  public void overreleaseInstance() {
+  void overreleaseInstance() {
     ResourceInstance foo1 = holder.getInternal(SHARED_FOO);
     holder.releaseInternal(SHARED_FOO, foo1);
     try {
@@ -179,7 +187,7 @@ public void overreleaseInstance() {
   }
 
   @Test
-  public void handleInstanceCloseError() {
+  void handleInstanceCloseError() {
     class ExceptionOnCloseResource implements SharedResourceHolder.Resource<ResourceInstance> {
       @Override
       public ResourceInstance create() {

java-core/google-cloud-core-http/pom.xml

@@ -77,8 +77,18 @@
 
     <!-- Test dependencies -->
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
+      <groupId>org.junit.platform</groupId>
+      <artifactId>junit-platform-launcher</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.vintage</groupId>
+      <artifactId>junit-vintage-engine</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>

java-core/google-cloud-core-http/src/test/java/com/google/cloud/http/BaseHttpServiceExceptionTest.java

@@ -21,10 +21,10 @@
 import static org.easymock.EasyMock.expect;
 import static org.easymock.EasyMock.replay;
 import static org.easymock.EasyMock.verify;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.api.client.googleapis.json.GoogleJsonError;
 import com.google.cloud.BaseServiceException;
@@ -35,9 +35,9 @@
 import java.net.SocketTimeoutException;
 import java.util.Collections;
 import java.util.Set;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
-public class BaseHttpServiceExceptionTest {
+class BaseHttpServiceExceptionTest {
 
   private static final int CODE = 1;
   private static final int CODE_NO_REASON = 2;
@@ -53,7 +53,7 @@ private static class CustomServiceException extends BaseHttpServiceException {
 
     private static final long serialVersionUID = -195251309124875103L;
 
-    public CustomServiceException(int code, String message, String reason, boolean idempotent) {
+    CustomServiceException(int code, String message, String reason, boolean idempotent) {
       super(code, message, reason, idempotent, RETRYABLE_ERRORS);
     }
 
@@ -63,7 +63,7 @@ public CustomServiceException(int code, String message, String reason, boolean i
   }
 
   @Test
-  public void testBaseServiceException() {
+  void testBaseServiceException() {
     BaseServiceException serviceException =
         new BaseHttpServiceException(CODE, MESSAGE, REASON, IDEMPOTENT, EMPTY_RETRYABLE_ERRORS);
     assertEquals(CODE, serviceException.getCode());
@@ -145,7 +145,7 @@ public void testBaseServiceException() {
   }
 
   @Test
-  public void testTranslateAndThrow() throws Exception {
+  void testTranslateAndThrow() throws Exception {
     BaseServiceException cause =
         new BaseHttpServiceException(CODE, MESSAGE, REASON, IDEMPOTENT, EMPTY_RETRYABLE_ERRORS);
     RetryHelper.RetryHelperException exceptionMock =