### Question:
ByteArrayExtractors { static String getQualifier(String valueExpression) { return splitFamilyAndQualifier(valueExpression)[1]; }  static ByteArrayExtractor getExtractor(String fieldValueExpression, ValueSource valueSource);  }### Answer:
@Test public void testGetQualifier() { assertEquals("qualifier", ByteArrayExtractors.getQualifier("colfam:qualifier")); }
@Test(expected = IllegalArgumentException.class) public void testGetQualifier_NoColon() { ByteArrayExtractors.getQualifier("qualifier"); }