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Tham khảo tài liệu 'phát triển javascript - part 50', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 17.1 Improving Readability 463 Keep names as short as possible without sacrificing clarity. Group-related tests in separate test cases and indicate the relation in the test case name thus avoiding the same prefix in a large number of tests. Never state what code is expected to do using the word and doing so indicates the test is not specific enough i.e. it is likely trying to test more than one aspect of the target method. Focus on the what and why not the how. 17.1.1.2 Breaking Free of Technical Limitations All of the tests in Part III Real-World Test-Driven Development in JavaScript were written using libraries that consider any method whose name starts with test to be a test. This leaves room for adding other properties on the test case that are not run as tests. In the interest of using libraries without modification we have rolled with this ending up with a bunch of tests with names starting with test should which is a bit of a smell. Because we can easily add helper functions in a closure surrounding the test case there really is no need for the test case to reserve space for helper methods i.e. function properties whose names do not start with the obligatory test . By considering any function-valued property a test test cases could allow more flexibility in the naming of tests. Luckily wrapping e.g. JsTestDriver s TestCase function to do just that is simple. Listing 17.1 shows an enhanced test case function. It works just like the original only all functions except setup and tearDown are considered tests. Listing 17.1 Enhancing JsTestDriver s test case function function testCaseEnhanced name tests var testMethods var property for var testName in tests property tests testName if typeof property function A setUp tearDown .test testName testName test testName testMethods testName property return TestCase name testMethods Download from www.eBookTM.com 464 Writing Good Unit Tests The function simply loops all the properties of the test object prepends function .
