如何测试具有参数EditText和TextView的方法

Question

我有一个要测试的方法，该方法具有签名公共无效processBalance（EditText incomeField，HashMap yearsMappedToObjectYearsMap，boolean isPaymentCircleSet，TextView balanceLabel），并且位于util类MainActivityUtil中。 我的MainActivity是

public class MainActivity extends AppCompatActivity implements IHODClientCallback {

@Override
protected void onCreate(Bundle savedInstanceState) {

....

mainUtil = new MainActivityUtil(this);
incomeField = new EditText(this);
incomeField = (EditText) findViewById(R.id.incomeField); 
isPaymentCircleSet = sharedprefs.getBoolean(ISPAYMENTCIRCLE, false);
balanceLabel = new TextView(this);
balanceLabel = (TextView) findViewById(R.id.balanceView);

yearsMappedToObjectYearsMap = new HashMap<>();
yearsMappedToObjectYearsMap = util.readTheFile();

//and the method later is called

mainUtil.processBalance(incomeField, yearsMappedToObjectYearsMap,isPaymentCircleSet,balanceLabel);
}
}

我想编写一个Junit测试来测试此方法，我已经知道到目前为止我可以使用Mockito：

@RunWith(MockitoJUnitRunner.class)
public class MainActivityTests {
    @Mock
    private Context context;
    @Mock
    private EditText incomeField;
    @Mock
    MainActivity mMockMainActivity;
    @Test
    public void testProcessBalance(){

        MainActivityUtil mainUtil = new MainActivityUtil(context);
        incomeField = (EditText) mMockMainActivity.findViewById(R.id.incomeField);
        incomeField.setText(1000);
        HashMap<String, AnyYear> yearsMappedToObjectYearsMap = new HashMap<>();
        boolean isPaymentCircleSet = false;
        TextView balanceLabel = new TextView(context);
        mainUtil.processBalance(incomeField,yearsMappedToObjectYearsMap,isPaymentCircleSet,balanceLabel);

    }

我看到IncomeField为null，这是错误的。任何帮助将不胜感激。