@VisibleForTesting 
public String getTextInputData() { 
    return mInputDateEditText.getText().toString(); 
} 

@VisibleForTesting 
public String getTextResult() { 
    return mResultTextView.getText().toString(); 
} 

@VisibleForTesting 
public Button getAddButton() { 
    return mAddButton; 
} 

@VisibleForTesting 
public EditText getInputDataEditText() { 
    return mInputDateEditText; 
} 

@VisibleForTesting 
public Button getCleanButton() { 
    return mCleanButton; 
} 

@VisibleForTesting 
public Button getCalculateButton() { 
    return mCalculateButton; 
}