Testing methods including the context and etc

Issue

How to test method that accesses the app context, for example in order to get a string from resources.

Code:

public String getString(Context context) {
    String string = context.getResources().getString(R.id.string);
    return string;
}

Test code:

MyClass myClass;

Context context; // ???

@Before
public void setUp(){
     myClass = new MyClass();
}

@Test
public void convertToMessage() throws Exception  {
    String myString = "My string";
    String gettedString = myClass.getString(context);
    assertEquals(myString, gettedString);
}

What to do with the context?

Solution

@Before
public void setUp(){
     myClass = new MyClass();
     context = InstrumentationRegistry.getTargetContext();
}

See also the Android testing documentation and the InstrumentationRegistry JavaDocs.

Answered By - CommonsWare