Upgrade JUnit4 to JUnit5

.github/workflows/ci-java-17-and-21.yml

@@ -0,0 +1,34 @@
+name: Java CI
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 17, 21 ]
+    name: Java ${{ matrix.java }} build
+    steps:
+      - uses: actions/checkout@v4
+      - name: Prepare multi-module build
+        run: |
+          git submodule update --init --recursive
+      - name: Set up Java
+        uses: actions/setup-java@v3
+        with:
+          distribution: liberica
+          java-version: ${{ matrix.java }}
+      - name: Cache Maven packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build with Maven
+        run: ./mvnw clean package -Dgpg.skip
+      - if: ${{ matrix.java != 8 }}
+        name: Check style with Spotless
+        run: ./mvnw spotless:check
+

.gitignore

@@ -1,9 +1,10 @@
 .idea/
+.vscode/
 target/
 bin/
 .project
 .classpath
 .settings/
 .factorypath
 .gradle
-.history
+.history/

cloudfoundry-client-reactor/pom.xml

@@ -50,10 +50,11 @@
             <groupId>com.github.zafarkhaja</groupId>
             <artifactId>java-semver</artifactId>
         </dependency>
-        <dependency>
-            <groupId>com.squareup.okhttp3</groupId>
-            <artifactId>mockwebserver</artifactId>
-            <scope>test</scope>
+    <dependency>
+      <groupId>com.squareup.okhttp3</groupId>
+      <artifactId>mockwebserver3-junit5</artifactId>
+      <scope>test</scope>
+      <version>5.0.0-alpha.11</version>
         </dependency>
         <dependency>
             <groupId>io.jsonwebtoken</groupId>
@@ -88,11 +89,6 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.junit.vintage</groupId>
-            <artifactId>junit-vintage-engine</artifactId>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>

cloudfoundry-client-reactor/src/test/java/org/cloudfoundry/reactor/AbstractRestTest.java

@@ -24,16 +24,12 @@
 import com.fasterxml.jackson.databind.JsonDeserializer;
 import com.fasterxml.jackson.databind.deser.DeserializationProblemHandler;
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Queue;
-import okhttp3.mockwebserver.Dispatcher;
-import okhttp3.mockwebserver.MockResponse;
-import okhttp3.mockwebserver.MockWebServer;
-import okhttp3.mockwebserver.RecordedRequest;
-import org.junit.After;
-import org.junit.ComparisonFailure;
+import java.util.*;
+import mockwebserver3.Dispatcher;
+import mockwebserver3.MockResponse;
+import mockwebserver3.MockWebServer;
+import mockwebserver3.RecordedRequest;
+import org.junit.jupiter.api.AfterEach;
 import org.slf4j.bridge.SLF4JBridgeHandler;
 import reactor.core.publisher.Mono;
 
@@ -68,12 +64,12 @@ protected AbstractRestTest() {
         this.root = Mono.just(this.mockWebServer.url("/").uri().toString());
     }
 
-    @After
+    @AfterEach
     public final void shutdown() throws IOException {
         this.mockWebServer.shutdown();
     }
 
-    @After
+    @AfterEach
     public final void verify() {
         this.multipleRequestDispatcher.verify();
     }
@@ -122,7 +118,7 @@ public MockResponse dispatch(RecordedRequest request) {
             try {
                 interactionContext.getRequest().assertEquals(request);
                 return interactionContext.getResponse().getMockResponse();
-            } catch (ComparisonFailure e) {
+            } catch (AssertionError e) {
                 e.printStackTrace();
                 return new MockResponse().setResponseCode(400);
             }

cloudfoundry-client-reactor/src/test/java/org/cloudfoundry/reactor/CustomRequestTagTest.java

@@ -23,11 +23,11 @@
 import java.util.Collections;
 import org.cloudfoundry.reactor.util.AbstractReactorOperations;
 import org.cloudfoundry.reactor.util.Operator;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 
-public final class CustomRequestTagTest extends AbstractRestTest {
+final class CustomRequestTagTest extends AbstractRestTest {
 
     private static final String CUSTOM_REQUEST_TAG_NAME = "test-header";
 
@@ -41,7 +41,7 @@ public final class CustomRequestTagTest extends AbstractRestTest {
                     .build();
 
     @Test
-    public void addCustomHttpHeader() {
+    void addCustomHttpHeader() {
         mockRequest(
                 InteractionContext.builder()
                         .request(

cloudfoundry-client-reactor/src/test/java/org/cloudfoundry/reactor/DefaultConnectionContextTest.java

@@ -25,13 +25,13 @@
 import java.net.InetSocketAddress;
 import java.time.Duration;
 import java.util.Optional;
-import org.junit.After;
-import org.junit.Test;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
 import reactor.netty.http.client.HttpClient;
 import reactor.netty.transport.ProxyProvider;
 import reactor.test.StepVerifier;
 
-public final class DefaultConnectionContextTest extends AbstractRestTest {
+final class DefaultConnectionContextTest extends AbstractRestTest {
 
     private final DefaultConnectionContext connectionContext =
             DefaultConnectionContext.builder()
@@ -40,13 +40,13 @@ public final class DefaultConnectionContextTest extends AbstractRestTest {
                     .secure(false)
                     .build();
 
-    @After
-    public void dispose() {
+    @AfterEach
+    void dispose() {
         this.connectionContext.dispose();
     }
 
     @Test
-    public void getInfo() {
+    void getInfo() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -77,7 +77,7 @@ public void getInfo() {
     }
 
     @Test
-    public void multipleInstances() {
+    void multipleInstances() {
         DefaultConnectionContext first =
                 DefaultConnectionContext.builder().apiHost("test-host").build();
 
@@ -92,7 +92,7 @@ public void multipleInstances() {
     }
 
     @Test
-    public void configurationAlwaysApplied() {
+    void configurationAlwaysApplied() {
         DefaultConnectionContext ctx =
                 DefaultConnectionContext.builder()
                         .connectionPoolSize(24)

cloudfoundry-client-reactor/src/test/java/org/cloudfoundry/reactor/DelegatingRootProviderTest.java

@@ -22,10 +22,10 @@
 
 import io.netty.handler.codec.http.HttpResponseStatus;
 import java.time.Duration;
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 import reactor.test.StepVerifier;
 
-public final class DelegatingRootProviderTest extends AbstractRestTest {
+final class DelegatingRootProviderTest extends AbstractRestTest {
 
     private final DelegatingRootProvider rootProvider =
             DelegatingRootProvider.builder()
@@ -36,7 +36,7 @@ public final class DelegatingRootProviderTest extends AbstractRestTest {
                     .build();
 
     @Test
-    public void getRoot() {
+    void getRoot() {
         this.rootProvider
                 .getRoot(CONNECTION_CONTEXT)
                 .as(StepVerifier::create)
@@ -46,7 +46,7 @@ public void getRoot() {
     }
 
     @Test
-    public void getRootCloudFoundryClientV2() {
+    void getRootCloudFoundryClientV2() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -68,7 +68,7 @@ public void getRootCloudFoundryClientV2() {
     }
 
     @Test
-    public void getRootCloudFoundryClientV2Fallback() {
+    void getRootCloudFoundryClientV2Fallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -88,7 +88,7 @@ public void getRootCloudFoundryClientV2Fallback() {
     }
 
     @Test
-    public void getRootCloudFoundryClientV3() {
+    void getRootCloudFoundryClientV3() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -110,7 +110,7 @@ public void getRootCloudFoundryClientV3() {
     }
 
     @Test
-    public void getRootCloudFoundryClientV3Fallback() {
+    void getRootCloudFoundryClientV3Fallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -130,7 +130,7 @@ public void getRootCloudFoundryClientV3Fallback() {
     }
 
     @Test
-    public void getRootDopplerClient() {
+    void getRootDopplerClient() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -150,7 +150,7 @@ public void getRootDopplerClient() {
     }
 
     @Test
-    public void getRootDopplerClientFallback() {
+    void getRootDopplerClientFallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -180,7 +180,7 @@ public void getRootDopplerClientFallback() {
     }
 
     @Test
-    public void getRootKeyNoKey() {
+    void getRootKeyNoKey() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -209,7 +209,7 @@ public void getRootKeyNoKey() {
     }
 
     @Test
-    public void getRootKeyNoValue() {
+    void getRootKeyNoValue() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -238,7 +238,7 @@ public void getRootKeyNoValue() {
     }
 
     @Test
-    public void getRootNetworkingClient() {
+    void getRootNetworkingClient() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -261,7 +261,7 @@ public void getRootNetworkingClient() {
     }
 
     @Test
-    public void getRootRoutingClientFallback() {
+    void getRootRoutingClientFallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -291,7 +291,7 @@ public void getRootRoutingClientFallback() {
     }
 
     @Test
-    public void getRootTokenProviderFallback() {
+    void getRootTokenProviderFallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -321,7 +321,7 @@ public void getRootTokenProviderFallback() {
     }
 
     @Test
-    public void getRootUaaClient() {
+    void getRootUaaClient() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -342,7 +342,7 @@ public void getRootUaaClient() {
     }
 
     @Test
-    public void getRootUaaClientFallback() {
+    void getRootUaaClientFallback() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())
@@ -372,7 +372,7 @@ public void getRootUaaClientFallback() {
     }
 
     @Test
-    public void getWithInvalidRoot() {
+    void getWithInvalidRoot() {
         mockRequest(
                 InteractionContext.builder()
                         .request(TestRequest.builder().method(GET).path("/").build())