Constructors

The tester also allows the user to test whether a constructor invocation for the given class and with the given arguments throws the expected exception with the message the programmer expects. The tester will report every type of failure - when the constructor fails to throw exception, when the constructor throws and exception of a different type, when the constructor throws an exception of the correct type, but with a wrong message.

An example of such test is shown below:

// A test for exceptions
// -- this code is expected to throw an exception of the given type 
//  but with a different message - and the test should fail
public void testConstructorExceptions(Tester t){    
  /** A test that throws an exception */
  t.checkConstructorException(
    // the test name - information about this test
    "new Date(4000, 10, 29) \n" +     
    "The test should fail: we supplied a wrong message",

    // the expected exception and message
    new IllegalArgumentException(   
      "Invalid yeer in Date."),

    // the class name
    "MyDate",                           

    // the comma-separated argument list ( or no arguments)  
    4000, 10, 29             
    );
}

This tester reports the failure of this test as follows:

Error in test number 2

 correct exception: 
 class: java.lang.IllegalArgumentException
 incorrect message: 

 message produced: Invalid year in Date.
 message expected: Invalid yeer in Date.
 after invoking the constructor for the class MyDate

tester.ErrorReport: Error trace:
	at ExamplesDates.testWithin(Date.java:65)
	at ExamplesDates.main(Date.java:82)

Code sources

Tests for constructor exceptions are included with general exceptions tests.

Here is the source code for this test suite.

You can also download the entire souce code as a zip file.

Complete test results are shown here.