@Test
public void handleImage2CssExceptionShouldShowExceptionMessage() {
final String formattedExceptionMessage = "formattedExceptionMessage";
final String exceptionMessage = "exceptionMessage";
final Image2CssException image2CssException = mock(Image2CssException.class);
when(image2CssException.getMessage())
.thenReturn(exceptionMessage);
doReturn(formattedExceptionMessage)
.when(exceptionHandler)
.format(exceptionMessageTemplate, exceptionMessage);