@Test
public void testRomanSystemConvertion() {
// Arrange
numberConverter.setArabicToRomanConverter(mockedArabicToRomanConverter);
// Stubbing
when(mockedArabicToRomanConverter.convert(1)).thenReturn("I");
// Act
String result = numberConverter.convert(1, "ROMAN");
// Assert
verify(mockedArabicToRomanConverter).convert(1);
assertEquals("I", result);
}
