Example 1

Example 2: a zip code validator

Suppose we want to write a JavaScript function that takes a variable and returns whether or not the variable is a string representing a 5 digit US zip code ( and let us assume here that any 5 digit number is valid). Assume our function is called isValidZipCode(proposedZipCode) and, again, that it lives in myJsScripts.js. A suitable Test Page would look like the following:

<html>
 <head>
  <title>Test Page for isValidZipCode(proposedZipCode)</title>
  <script language="javascript" src="jsUnitCore.js"></script>
  <script language="javascript" src="myJsScripts.js"></script>
 </head>
 <body>
  <script language="javascript">
    function testValidZipCode() {
      assert(isValidZipCode("90210"));
      assert(isValidZipCode("94114"));
    }

    function testInvalidZipCode() {
      assert(!isValidZipCode("foo"));
      assert(!isValidZipCode("9021"));
    }

  </script>
 </body>
</html>