### Question:
CharConverter implements Converter<Character, String> { public String convertToSap(Character javaValue) { if (javaValue == null) { return ""; } return "" + javaValue; }  Character convertToJava(String sapValue); String convertToSap(Character javaValue);  }### Answer:
@Test public void testConvertToSap() { assertEquals("", converter.convertToSap(null)); assertEquals(" ", converter.convertToSap(' ')); assertEquals("A", converter.convertToSap('A')); }