Unit Testing - Revision history

Arif Iqbal at 06:06, 15 August 2007

2007-08-15T06:06:50Z

Arif Iqbal: added wikipedia link

2007-08-15T06:05:41Z

added wikipedia link

Arif Iqbal at 05:42, 15 August 2007

2007-08-15T05:42:46Z

Arif Iqbal: Document started

2007-08-15T05:27:55Z

Document started

New page

Unit Testing means testing small chunks of code. We want to be sure that when we write any software we are really [[DoneDone]]. [[TestDrivenDevelopment]] says that you should write your tests before writing any code as the tests gives you insights into what exactly you want to do. Then incrementally you keep on passing the test cases and when you have passed all the test cases, you are then confident that the code works

Following is a small example of unit testing in [[Ruby]]. We have made a new class named MyClass and have written a small unit test named TestMyClass to test this class

require 'test/unit'
class MyClass
def square(val)
return val*val
end
def double(val)
return val
end
end
class TestMyClass < Test::Unit::TestCase
def setup
@myclass = MyClass.new
end
def teardown
end
def test_square
assert_equal(9, @myclass.square(3))
end
def test_first
assert_equal(6, @myclass.square(3))
end
end

setup is used to initialize any variables for the tests. All the test cases start with the test keyword like test_square etc. when we run this test we get

Loaded suite testing_example
Started
F.
Finished in 0.007477 seconds.
1) Failure:
test_first(TestMyClass) [testing_example.rb:25]:
<6> expected but was
<9>.
2 tests, 2 assertions, 1 failures, 0 errors

← Older revision		Revision as of 06:06, 15 August 2007
Line 39:		Line 39:

	As the last line in the output shows that one test(test_double) failed out of the two tests.		As the last line in the output shows that one test(test_double) failed out of the two tests.
		+	----
	http://en.wikipedia.org/wiki/Unit_testing		http://en.wikipedia.org/wiki/Unit_testing

← Older revision		Revision as of 06:05, 15 August 2007
Line 39:		Line 39:

	As the last line in the output shows that one test(test_double) failed out of the two tests.		As the last line in the output shows that one test(test_double) failed out of the two tests.
		+	http://en.wikipedia.org/wiki/Unit_testing

@@ Line 21: / Line 21: @@
       assert_equal(9, @myclass.square(3))
     end
-    def test_first
+    def test_double
       assert_equal(6, @myclass.square(3))
     end
   end
-setup is used to initialize any variables for the tests. All the test cases start with the test keyword like test_square etc. when we run this test we get
+setup is used to initialize any variables for the tests. All the test cases start with the test keyword like test_square etc. assert_equal input parameters are expected output and the actual output i.e. assert_equal(expected_output, actual_output). when we run this test we get
   Loaded suite testing_example
@@ Line 33: / Line 33: @@
   Finished in 0.007477 seconds.
 ) Failure:
-  test_first(TestMyClass) [testing_example.rb:25]:
+  test_double(TestMyClass) [testing_example.rb:25]:
   <6> expected but was
   <9>.
 tests, 2 assertions, 1 failures, 0 errors