update build.gradle to work with junit5 (#12535)

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/build.gradle.mustache

@@ -134,6 +134,7 @@ dependencies {
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.mockito:mockito-core:3.12.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
 }
 
 javadoc {
@@ -166,3 +167,17 @@ spotless {
         importOrder()
     }
 }
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+
+}

samples/client/others/java/okhttp-gson-streaming/build.gradle

@@ -119,6 +119,7 @@ dependencies {
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.mockito:mockito-core:3.12.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
 }
 
 javadoc {
@@ -151,3 +152,17 @@ spotless {
         importOrder()
     }
 }
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+
+}

samples/client/petstore/java/okhttp-gson-dynamicOperations/build.gradle

@@ -121,6 +121,7 @@ dependencies {
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.mockito:mockito-core:3.12.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
 }
 
 javadoc {
@@ -153,3 +154,17 @@ spotless {
         importOrder()
     }
 }
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+
+}

samples/client/petstore/java/okhttp-gson-parcelableModel/build.gradle

@@ -120,6 +120,7 @@ dependencies {
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.mockito:mockito-core:3.12.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
 }
 
 javadoc {
@@ -152,3 +153,17 @@ spotless {
         importOrder()
     }
 }
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+
+}

samples/client/petstore/java/okhttp-gson/build.gradle

@@ -120,6 +120,7 @@ dependencies {
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.mockito:mockito-core:3.12.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
 }
 
 javadoc {
@@ -152,3 +153,17 @@ spotless {
         importOrder()
     }
 }
+
+test {
+    // Enable JUnit 5 (Gradle 4.6+).
+    useJUnitPlatform()
+
+    // Always run tests, even when nothing changed.
+    dependsOn 'cleanTest'
+
+    // Show test results.
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
+
+}