Step 3: Unit testing

Step 3: Unit testing
	Chapter 3. Basic concepts and concepts for more reliable code

Unit testing is without any doubts one of the most effective ways to detect bugs early and to write more reliable and maintainable code. Unit testing is therefore fully integrated in Obix and easy to use.

To check whether factory fa_contribution works as it is supposed to work we should now write a unit test. Proceed as follows:

Edit file fa_contribution.osc which you created in the previous chapter
.

Insert the following test script just before the last line of code (just before the last end instruction):

   test
      script
         // create a 'contribution' object and assign it to constant 'c'
         const contribution c = fa_contribution.create ( &
            identifier = 123 &
            first_name = "Albert" &
            last_name = "Newton" &
            random_number = 5 &
            date_time = fa_local_date_time.create ( "2011-08-27T16:16:30"~ ) )
            
         // verify all attributes
         verify c.identifier =v 123
         verify c.first_name =v "Albert"
         verify c.last_name =v "Newton"
         verify c.random_number =v 5
         verify c.date_time.to_string =v "2011-08-27T16:16:30"

         // verify the value returned by the 'to_string' command
         verify c.to_string =v "Albert Newton contributed '5' on 2011-08-27T16:16:30"
      end
   end

Compile and build the project again (by executing the compile_and_build system file).
Now execute the unit test by executing the run_tests system file which is located in your projects root directory (i.e. run_tests.sh on Linux systems and run_tests.bat on Windows systems).
If everything went fine the following is displayed on your system console:
```
Running unit tests in random_arcs
testing random_arcs.contribution.fa_contribution
1 object has been tested.

BRAVO AND CONGRATULATIONS!
All tests passed without errors.
```


Step 2: Creating objects		Advantages (so far)