Unit Testing in Java

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1711 Unit Testing
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In the JavaScript world, the best candidate on which to perform testing are object methods Methods usually contain a relatively small amount of code (or at least should), and they return a single object for a set of input parameters A single unit test should execute a single method for a given set of parameters and can then be compared to a single result By testing at this fine-grained level we can make our output comparison very simple, and the test either fails or succeeds Understanding the results of the test becomes straightforward
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1712 DOH The Dojo Unit Testing Framework
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All right, so unit testing is a good thing But how do we do it Remember, we re from Dojo, and we re here to help Dojo provides an excellent framework for helping us define and run unit testsThis framework is named doh It is pronounced like Homer Simpson s famous exclamation: Doh! (often accompanied by a smack to the forehead) The Dojo team eats their own dog food That is, in industry parlance, they use doh for testing Dojo is delivered with an entire suite of unit test scripts that were run on the various components of Dojo using doh And we can also use the doh testing framework to test custom JavaScript code that we write ourselves 17121 Create a New Unit Test Unit tests typically follow a pattern Following are the steps that occur inside almost all unit test methods:
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Create the object whose method is to be tested Execute the method under test with appropriate parameters and get back a result Compare that result to an expected result
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Sometimes these separate steps are combined together in a line of code, but we can still think of them as distinct Let s see an actual example of creating a unit test First we
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171 Testing
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need an object and method to testWe ll create an object called StringUtils that has a method countLetters, which can count the number of occurrences of a letter within a given string Following is the code to create the constructor for this object:
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function StringUtils() { thiscountLetters = function( string, char ) { var count = 0; for (i=1; i<=stringlength; i++) { if (string[i] == char) count++; } return count; } }
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This code could be included within the <script> tag of a page or in an included JavaScript fileTo create an instance of the object, we would use the new keyword on the constructor
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var su = new StringUtils();
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We can now test the utility method by running it and seeing what results we get
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result = sucountLetters("hello","o");
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The value of result should be 1 because there is one occurrence of the letter o in the string "hello"We could just display the result using an alert box But instead of using this informal approach to testing, we ll create the test as a doh unit test
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var testCase = { runTest: function() { var su = new StringUtils(); result = sucountLetters("hello","o"); dohassertEqual(1,result);} }
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We ve created a new object called testCase that contains a function called runTest Note that a unit test in doh is actually a JavaScript object itselfThe object must contain certain properties, one of which must be a function called runTestThis is the function that will be run by doh and contains the test case itselfThere are also other possible properties such as setUp and tearDown, which are run before and after the test methods, respectively, and can create and remove objects and other resources that the test method might need The last line of code in the preceding example is especially interestingThis is known as an assert method and is a standard unit test function that compares the output to the expected results For the test to succeed, the assert method must evaluate as true Sometimes this results in tests that might appear backwards at first For example, imagine that our string utility also has a method called hasLetter that returns a true or false depending on whether a given letter is in a string Not only do we want to test for the true condition when looking for a letter we expect to find, but we also want to test for
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