Set up mocks for Java Servlet API?
- Tabassum Ansari (Unlicensed)
The App Engine Testing Stubs provide a way to mock and simulate the behavior of the App Engine services, including the Servlet API. With the App Engine Testing Stubs, you can create a mock HttpServletRequest object for unit testing your servlets or web applications without the need for a full App Engine environment.
Here's an example of how you can mock an HttpServletRequest using the App Engine Testing Stubs:
import com.google.appengine.tools.development.testing.LocalServiceTestHelper;
import com.google.appengine.tools.development.testing.LocalAppIdentityServiceTestConfig;
import com.google.apphosting.api.ApiProxy;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import javax.servlet.http.HttpServletRequest;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
public class MyServletTest {
private final LocalServiceTestHelper testHelper = new LocalServiceTestHelper(new LocalAppIdentityServiceTestConfig());
@Before
public void setUp() {
testHelper.setUp();
}
@After
public void tearDown() {
testHelper.tearDown();
}
@Test
public void testMyServlet() {
// Create a mock HttpServletRequest
HttpServletRequest request = mock(HttpServletRequest.class);
// Set up the desired behavior of the request
when(request.getParameter("param")).thenReturn("value");
// Call your servlet or web application with the mock request
// ...
// Assert the expected behavior
// ...
}
}
In the example above, the LocalServiceTestHelper is used to set up and tear down the local App Engine services. Then, a mock HttpServletRequest is created using Mockito. You can use Mockito to define the desired behavior of the mock request, such as returning specific parameter values when getParameter() is called.
By using the App Engine Testing Stubs and Mockito, you can effectively mock and simulate the behavior of HttpServletRequest in your unit tests for servlets or web applications.
Here's an example of how you can mock an HttpSession using the App Engine Testing Stubs:
you can mock the HttpSession object using the App Engine stubs provided by the appengine-testing library. The App Engine stubs allow you to simulate the behavior of the App Engine environment, including HTTP requests and sessions, during unit testing.
In your unit test class, set up the App Engine environment using the LocalServiceTestHelper provided by the appengine-testing library. This will initialize the necessary stubs.
import com.google.appengine.tools.development.testing.LocalServiceTestHelper;
public class MyHttpSessionTest {
private final LocalServiceTestHelper helper = new LocalServiceTestHelper();
@BeforeEach
public void setup() {
helper.setUp();
}
@AfterEach
public void tearDown() {
helper.tearDown();
}
// Your test methods...
}
Within your test methods, you can mock the HttpSession object using the AppEngineHttpSession class provided by the appengine-testing library. You can create a new instance of AppEngineHttpSession and set it as the current session.
import com.google.appengine.tools.development.testing.AppEngineHttpSession;
@Test
public void testMyMethod() {
// Create a new instance of AppEngineHttpSession
HttpSession session = new AppEngineHttpSession();
// Set it as the current session
helper.setEnvIsLoggedIn(true).setEnvIsAdmin(true).setEnvAttributes(
ImmutableMap.of("javax.servlet.http.HttpSession", session)
);
// Your test logic...
}
By mocking the HttpSession object using the App Engine stubs, you can simulate different session-related scenarios and test your code accordingly.