Add unit tests for "server start" command.

Change-Id: I19060419a17b8e081e8f51c08959f24b84e7e570
Implements: blueprint osc-unit-test-framework-improvement

Author: tang-chen

openstackclient/tests/compute/v2/test_server.py

@@ -799,6 +799,26 @@ def test_server_resume_multi_servers(self):
         self.run_method_with_servers('resume', 3)
 
 
+class TestServerStart(TestServer):
+
+    def setUp(self):
+        super(TestServerStart, self).setUp()
+
+        # Get the command object to test
+        self.cmd = server.StartServer(self.app, None)
+
+        # Set methods to be tested.
+        self.methods = {
+            'start': None,
+        }
+
+    def test_server_start_one_server(self):
+        self.run_method_with_servers('start', 1)
+
+    def test_server_start_multi_servers(self):
+        self.run_method_with_servers('start', 3)
+
+
 class TestServerSuspend(TestServer):
 
     def setUp(self):