From 574c053ebb757f5d61da0aca058f66f26111e0ff Mon Sep 17 00:00:00 2001
From: apolcyn <apolcyn@google.com>
Date: Fri, 1 Feb 2019 16:49:54 -0800
Subject: [PATCH] interop-testing:  Add GoogleDefaultCreds test case for java

---
 .../integration/AbstractInteropTest.java      | 21 +++++++++++++++++++
 .../grpc/testing/integration/TestCases.java   |  2 ++
 .../integration/TestServiceClient.java        | 13 ++++++++++++
 .../testing/integration/TestCasesTest.java    |  1 +
 4 files changed, 37 insertions(+)

diff --git a/interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java b/interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java
index a50dda5a86..7b6b7d19e8 100644
--- a/interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java
+++ b/interop-testing/src/main/java/io/grpc/testing/integration/AbstractInteropTest.java
@@ -1712,6 +1712,27 @@ public abstract class AbstractInteropTest {
     oauth2AuthToken(jsonKey, credentialsStream, oauthScope);
   }
 
+  /** Sends an unary rpc with "google default credentials". */
+  public void googleDefaultCredentials(
+      String defaultServiceAccount,
+      TestServiceGrpc.TestServiceBlockingStub googleDefaultStub) throws Exception {
+    final SimpleRequest request = SimpleRequest.newBuilder()
+        .setFillUsername(true)
+        .setResponseSize(314159)
+        .setPayload(Payload.newBuilder()
+            .setBody(ByteString.copyFrom(new byte[271828])))
+        .build();
+    final SimpleResponse response = googleDefaultStub.unaryCall(request);
+    assertEquals(defaultServiceAccount, response.getUsername());
+
+    final SimpleResponse goldenResponse = SimpleResponse.newBuilder()
+        .setUsername(defaultServiceAccount)
+        .setPayload(Payload.newBuilder()
+            .setBody(ByteString.copyFrom(new byte[314159])))
+        .build();
+    assertResponse(goldenResponse, response);
+  }
+
   protected static void assertSuccess(StreamRecorder<?> recorder) {
     if (recorder.getError() != null) {
       throw new AssertionError(recorder.getError());
diff --git a/interop-testing/src/main/java/io/grpc/testing/integration/TestCases.java b/interop-testing/src/main/java/io/grpc/testing/integration/TestCases.java
index 7ac02ad57d..c11580ca75 100644
--- a/interop-testing/src/main/java/io/grpc/testing/integration/TestCases.java
+++ b/interop-testing/src/main/java/io/grpc/testing/integration/TestCases.java
@@ -42,6 +42,8 @@ public enum TestCases {
   JWT_TOKEN_CREDS("JWT-based auth"),
   OAUTH2_AUTH_TOKEN("raw oauth2 access token auth"),
   PER_RPC_CREDS("per rpc raw oauth2 access token auth"),
+  GOOGLE_DEFAULT_CREDENTIALS(
+      "google default credentials, i.e. GoogleManagedChannel based auth"),
   CUSTOM_METADATA("unary and full duplex calls with metadata"),
   STATUS_CODE_AND_MESSAGE("request error code and message"),
   SPECIAL_STATUS_MESSAGE("special characters in status message"),
diff --git a/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java b/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
index b90eaa829f..2d88bfec6c 100644
--- a/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
+++ b/interop-testing/src/main/java/io/grpc/testing/integration/TestServiceClient.java
@@ -304,6 +304,19 @@ public class TestServiceClient {
         break;
       }
 
+      case GOOGLE_DEFAULT_CREDENTIALS: {
+        ManagedChannel channel = GoogleDefaultChannelBuilder.forAddress(
+            serverHost, serverPort).build();
+        try {
+          TestServiceGrpc.TestServiceBlockingStub googleDefaultStub =
+              TestServiceGrpc.newBlockingStub(channel);
+          tester.googleDefaultCredentials(defaultServiceAccount, googleDefaultStub);
+        } finally {
+          channel.shutdownNow();
+        }
+        break;
+      }
+
       case CUSTOM_METADATA: {
         tester.customMetadata();
         break;
diff --git a/interop-testing/src/test/java/io/grpc/testing/integration/TestCasesTest.java b/interop-testing/src/test/java/io/grpc/testing/integration/TestCasesTest.java
index cec02dde8a..2ce95b412f 100644
--- a/interop-testing/src/test/java/io/grpc/testing/integration/TestCasesTest.java
+++ b/interop-testing/src/test/java/io/grpc/testing/integration/TestCasesTest.java
@@ -56,6 +56,7 @@ public class TestCasesTest {
       "jwt_token_creds",
       "oauth2_auth_token",
       "per_rpc_creds",
+      "google_default_credentials",
       "custom_metadata",
       "status_code_and_message",
       "special_status_message",