How to inject ServletContext for JUnit tests with Spring?

In your unit test, you are probably going to want to create an instance of a MockServletContext.

You can then pass this instance to your service object through a setter method.

As of Spring 4, @WebAppConfiguration annotation on unit test class should be sufficient, see Spring reference documentation

@ContextConfiguration@WebAppConfigurationpublic class WebAppTest {    @Test    public void testMe() {}}

Probably you want to read resources with servletContext.getResourceAsStream or something like that, for this I've used Mockito like this:

 @BeforeClassvoid setupContext() {    ctx = mock(ServletContext.class);    when(ctx.getResourceAsStream(anyString())).thenAnswer(new Answer<InputStream>() {        String path = MyTestClass.class.getProtectionDomain().getCodeSource().getLocation().getPath()                + "../../src/main/webapp";        @Override        public InputStream answer(InvocationOnMock invocation) throws Throwable {            Object[] args = invocation.getArguments();            String relativePath = (String) args[0];            InputStream is = new FileInputStream(path + relativePath);            return is;        }    });}