Add unit test example to java-maven-quarkus

There are two tests, one that uses `@RestateTest` and one the uses `@QuarkusTest` with `RestateRunner`.

Author: djarnis73

java/templates/java-maven-quarkus/README.md

@@ -12,4 +12,10 @@ To start the service, simply run:
 
 ```shell
 $ quarkus dev
-```
+```
+
+## Unit testing
+
+The restate `RestateExtension` junit extension does currently not work together with quarkus CDI, so you cannot combine 
+`@RestateTest` with `@QuarkusTest`, so if you want to use `@Inject` in unit test with restate services, you must use 
+the `RestateRunner` directly as shown in the `GreeterCdiTest`.

java/templates/java-maven-quarkus/pom.xml

@@ -39,13 +39,24 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-vertx</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-junit5</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>dev.restate</groupId>
             <artifactId>sdk-java-http</artifactId>
             <version>${restate.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>dev.restate</groupId>
+            <artifactId>sdk-testing</artifactId>
+            <version>${restate.version}</version>
+            <scope>test</scope>
+        </dependency>
+
         <!-- This is usually not needed, but fails without it with CNFE -->
         <dependency>
             <groupId>com.google.protobuf</groupId>

java/templates/java-maven-quarkus/src/test/java/org/acme/GreeterCdiTest.java

@@ -0,0 +1,44 @@
+package org.acme;
+
+import dev.restate.client.Client;
+import dev.restate.sdk.endpoint.Endpoint;
+import dev.restate.sdk.testing.RestateRunner;
+import io.quarkus.test.junit.QuarkusTest;
+import jakarta.inject.Inject;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@QuarkusTest
+public class GreeterCdiTest {
+
+    @Inject
+    Greeter greeter;
+
+    static RestateRunner restateRunner;
+
+    @BeforeEach
+    void beforeEach() {
+        if (restateRunner == null) {
+            restateRunner = RestateRunner.from(Endpoint.builder().bind(greeter).build()).build();
+            restateRunner.start();
+        }
+    }
+
+    @AfterAll
+    static void afterAll() {
+        if (restateRunner != null && restateRunner.getRestateContainer().isRunning()) {
+            restateRunner.stop();
+        }
+    }
+
+    @Test
+    void test() {
+        var ingressClient = Client.connect(restateRunner.getRestateUrl().toString());
+        var c = GreeterClient.fromClient(ingressClient);
+        var response = c.greet(new Greeter.Greeting("John Doe"));
+        assertEquals("You said hi to John Doe!", response.message());
+    }
+}

java/templates/java-maven-quarkus/src/test/java/org/acme/GreeterTest.java

@@ -0,0 +1,24 @@
+package org.acme;
+
+import dev.restate.client.Client;
+import dev.restate.sdk.testing.BindService;
+import dev.restate.sdk.testing.RestateClient;
+import dev.restate.sdk.testing.RestateTest;
+import org.acme.Greeter.GreetingResponse;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@RestateTest
+public class GreeterTest {
+
+    @BindService
+    Greeter greeter = new Greeter();
+
+    @Test
+    void test(@RestateClient Client ingressClient) {
+        GreeterClient.IngressClient c = GreeterClient.fromClient(ingressClient);
+        GreetingResponse response = c.greet(new Greeter.Greeting("John Doe"));
+        assertEquals("You said hi to John Doe!", response.message());
+    }
+}