Example 1

Example 1: some simple math

Suppose we want to write a test for a function called multiplyAndAddFive(value1, value2) which multiplies value1 and value2 together, adds five, and returns the result. Also suppose that this function lives in a file called "myJsScripts.js". Assume that if non-numeric values are passed in, the function should return null. A suitable Test Page would look like the following:

<html>
 <head>
  <title>Test Page for multiplyAndAddFive(value1, value2)</title>
  <script language="javascript" src="jsUnitCore.js"></script>
  <script language="javascript" src="myJsScripts.js"></script>
 </head>
 <body>
  <script language="javascript">
    function testWithValidArgs() {
        assertEquals("2 times 3 plus 5 is 11", 11, multiplyAndAddFive(2, 3));
        assertEquals("Should work with negative numbers", -15, multiplyAndAddFive(-4, 5));
    }
    function testWithInvalidArgs() {
        assertNull("A null argument should result in null", multiplyAndAddFive(2, null));
        assertNull("A string argument should result in null", multiplyAndAddFive(2, "a string"));
    }
    function testStrictReturnType() {
        assertNotEquals("Should return a number, not a string", "11", multiplyAndAddFive(2, 3));
    }
    function testWithUndefinedValue() {
        assertNull("An undefined argument should result in null", multiplyAndAddFive(2, JSUNIT_UNDEFINED_VALUE));
    }
  </script>
 </body>
</html>