### Question:
WSDLImport { public static Boolean isValidString(String importValue) { String[] importParts = splitImportString(importValue); if (importParts.length != 3) { return false; } if (!importParts[0].equals(IDENTIFIER)) { return false; } if (importParts[1].isEmpty()) { return false; } if (importParts[2].isEmpty()) { return false; } return true; } WSDLImport();  WSDLImport(@MapsTo("location") final String location,
                      @MapsTo("namespace") final String namespace); static Boolean isValidString(String importValue); static WSDLImport fromString(String importValue); String getLocation(); void setLocation(final String location); String getNamespace(); void setNamespace(final String namespace); @Override String toString();  }### Answer:
@Test public void isValidString() { String validString = IDENTIFIER + DELIMITER + LOCATION + DELIMITER + NAMESPACE; assertTrue(WSDLImport.isValidString(validString)); String invalidString1 = IDENTIFIER + DELIMITER + LOCATION; assertFalse(WSDLImport.isValidString(invalidString1)); String invalidString2 = IDENTIFIER + DELIMITER + LOCATION + DELIMITER + NAMESPACE + DELIMITER + "invalid"; assertFalse(WSDLImport.isValidString(invalidString2)); String invalidString3 = "invalid" + DELIMITER + LOCATION + DELIMITER + NAMESPACE; assertFalse(WSDLImport.isValidString(invalidString3)); String invalidString4 = IDENTIFIER + DELIMITER + STRING_EMPTY + DELIMITER + STRING_EMPTY; assertFalse(WSDLImport.isValidString(invalidString4)); String invalidString5 = IDENTIFIER + DELIMITER + STRING_EMPTY + DELIMITER + NAMESPACE; assertFalse(WSDLImport.isValidString(invalidString5)); String invalidString6 = IDENTIFIER + DELIMITER + LOCATION + DELIMITER + STRING_EMPTY; assertFalse(WSDLImport.isValidString(invalidString6)); }