add system test for the debuglet api

package.json

@@ -46,6 +46,7 @@
   },
   "scripts": {
     "test": "./bin/run-test.sh",
+    "system-test": "mocha system-test/*.js --no-timeouts --bail",
     "changelog": "./bin/run-changelog.sh",
     "coverage": "./bin/run-test.sh -c",
     "bump": "./bin/run-bump.sh",

system-test/test-debugletapi.js

@@ -0,0 +1,71 @@
+/**
+ * Copyright 2014 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+var assert = require('assert');
+var Logger = require('@google/cloud-diagnostics-common').logger;
+var logger = Logger.create();
+
+assert.ok(
+    process.env.GCLOUD_PROJECT,
+    'Need to have GCLOUD_PROJECT defined ' +
+        'along with valid application default credentials to be able to run this ' +
+        'test');
+
+var debug = require('../')();
+var DebugletApi = require('../src/debugletapi.js');
+
+describe('Debugletapi', function() {
+  var debugletApi = new DebugletApi({}, debug);
+  var debuggee = null;
+
+  before(function(done) {
+    debugletApi.init('test-uid', logger, function(err) {
+      assert.ifError(err, 'init should complete successfully');
+      done();
+    });
+  });
+
+  it('should register successfully', function(done) {
+    debugletApi.register(function(err, body) {
+      assert.ifError(err, 'should be able to register successfull');
+      assert.ok(body);
+      assert.ok(body.debuggee);
+      assert.ok(body.debuggee.id);
+      debuggee = body.debuggee;
+      done();
+    });
+  });
+
+  it('should list breakpoints', function(done) {
+    if (!debuggee) {
+      // Dependent on the previous test passing.
+      this.skip();
+      done();
+    }
+    debugletApi.listBreakpoints(function(err, response, body) {
+      assert.ifError(err, 'should successfully list breakpoints');
+      assert.ok(body);
+      assert.ok(body.nextWaitToken);
+      done();
+    });
+  });
+
+  // To be able to write the following test we need a service for adding a
+  // breakpoint (need the debugger API). TODO.
+  it('should update an active breakpoint');
+});