build response returned after start (#53)

#52

Author: pashidlos

src/main/java/io/visual_regression_tracker/sdk_java/VisualRegressionTracker.java

@@ -40,7 +40,7 @@ public VisualRegressionTracker(VisualRegressionTrackerConfig trackerConfig) {
         gson = new Gson();
     }
 
-    public void start() throws IOException {
+    public BuildResponse start() throws IOException {
         String projectName = configuration.getProject();
         String branch = configuration.getBranchName();
         String ciBuildId = configuration.getCiBuildId();
@@ -70,6 +70,7 @@ public void start() throws IOException {
 
         log.info("Visual Regression Tracker is started for project <{}>: buildId: <{}>, projectId: <{}>, ciBuildId: <{}>",
                  projectName, projectId, buildId, buildResponse.getCiBuildId());
+        return buildResponse;
     }
 
     public void stop() throws IOException {

src/test/java/io/visual_regression_tracker/sdk_java/VisualRegressionTrackerTest.java

@@ -100,13 +100,16 @@ public void shouldStartBuild() throws IOException, InterruptedException {
                                .setResponseCode(200)
                                .setBody(gson.toJson(buildResponse)));
 
-        vrt.start();
+        BuildResponse result = vrt.start();
 
         RecordedRequest recordedRequest = server.takeRequest();
         assertThat(recordedRequest.getHeader(VisualRegressionTracker.API_KEY_HEADER), is(config.getApiKey()));
         assertThat(recordedRequest.getBody().readUtf8(), is(gson.toJson(buildRequest)));
         assertThat(vrt.buildId, is(BUILD_ID));
         assertThat(vrt.projectId, is(PROJECT_ID));
+        assertThat(result.getId(), is(BUILD_ID));
+        assertThat(result.getProjectId(), is(PROJECT_ID));
+        assertThat(result.getCiBuildId(), is(CI_BUILD_ID));
     }
 
     @Test