Fix broken sample and add test for sample (GoogleCloudPlatform#1216)

Author: nnegrey

video/cloud-client/resources/cat.mp4

@@ -179,13 +179,11 @@ public static void analyzeLabelsFile(String filePath) throws Exception {
       // Read file and encode into Base64
       Path path = Paths.get(filePath);
       byte[] data = Files.readAllBytes(path);
-      byte[] encodedBytes = Base64.encodeBase64(data);
 
       AnnotateVideoRequest request = AnnotateVideoRequest.newBuilder()
-          .setInputContent(ByteString.copyFrom(encodedBytes))
+          .setInputContent(ByteString.copyFrom(data))
           .addFeatures(Feature.LABEL_DETECTION)
           .build();
-
       // Create an operation that will contain the response when the operation completes.
       OperationFuture<AnnotateVideoResponse, AnnotateVideoProgress> response =
           client.annotateVideoAsync(request);

video/cloud-client/src/main/java/com/example/video/Detect.java

@@ -33,7 +33,8 @@ public class DetectIT {
   private ByteArrayOutputStream bout;
   private PrintStream out;
 
-  static final String LABEL_FILE_LOCATION = "gs://demomaker/cat.mp4";
+  static final String LABEL_GCS_LOCATION = "gs://demomaker/cat.mp4";
+  static final String LABEL_FILE_LOCATION = "./resources/cat.mp4";
   static final String SHOTS_FILE_LOCATION = "gs://demomaker/gbikes_dinosaur.mp4";
   static final String EXPLICIT_CONTENT_LOCATION =  "gs://demomaker/cat.mp4";
 
@@ -51,7 +52,16 @@ public void tearDown() {
 
   @Test
   public void testLabels() throws Exception {
-    String[] args = {"labels", LABEL_FILE_LOCATION};
+    String[] args = {"labels", LABEL_GCS_LOCATION};
+    Detect.argsHelper(args);
+    String got = bout.toString();
+    // Test that the video with a cat has the whiskers label (may change).
+    assertThat(got.toUpperCase()).contains("WHISKERS");
+  }
+
+  @Test
+  public void testLabelsFile() throws Exception {
+    String[] args = {"labels-file", LABEL_FILE_LOCATION};
     Detect.argsHelper(args);
     String got = bout.toString();
     // Test that the video with a cat has the whiskers label (may change).