Add showcase tests for custom error details

Author: blakeli0

java-showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITUnaryCallable.java

@@ -20,12 +20,15 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import com.google.api.gax.grpc.GrpcStatusCode;
+import com.google.api.gax.rpc.ApiException;
 import com.google.api.gax.rpc.CancelledException;
 import com.google.api.gax.rpc.StatusCode;
 import com.google.rpc.Status;
 import com.google.showcase.v1beta1.EchoClient;
 import com.google.showcase.v1beta1.EchoRequest;
 import com.google.showcase.v1beta1.EchoResponse;
+import com.google.showcase.v1beta1.FailEchoWithDetailsRequest;
+import com.google.showcase.v1beta1.PoetryError;
 import com.google.showcase.v1beta1.it.util.TestClientInitializer;
 import java.util.concurrent.TimeUnit;
 import org.junit.jupiter.api.AfterAll;
@@ -72,6 +75,31 @@ void testGrpc_serverResponseError_throwsException() {
     assertThat(exception.getStatusCode().getCode()).isEqualTo(GrpcStatusCode.Code.CANCELLED);
   }
 
+  @Test
+  void grpc_failEchoWithDetails() {
+    FailEchoWithDetailsRequest request =
+            FailEchoWithDetailsRequest.newBuilder().build();
+    try {
+      grpcClient.failEchoWithDetails(request);
+    } catch (ApiException e) {
+      System.out.println(e.getErrorDetails().getMessage(PoetryError.class));
+      System.out.println(e.getErrorDetails().getLocalizedMessage());
+      System.out.println(e.getErrorDetails().getHelp());
+    }
+  }
+
+  @Test
+  void http_failEchoWithDetails() {
+    FailEchoWithDetailsRequest request =
+            FailEchoWithDetailsRequest.newBuilder().build();
+    try {
+      httpjsonClient.failEchoWithDetails(request);
+    } catch (ApiException e) {
+      e.printStackTrace();
+      System.out.println(e.getErrorDetails());
+    }
+  }
+
   @Test
   void testHttpJson_receiveContent() {
     assertThat(echoHttpJson("http-echo?")).isEqualTo("http-echo?");