Function test_while_loop

pythonwhat/test_funcs/test_compound_statement.py:144–202

Test parts of the while loop. This test function will allow you to extract parts of a specific while loop and perform a set of tests specifically on these parts. A while loop generally consists of two parts: the condition test, :code:`test`, which is the condition that is tested each lo

(state, index=1, test=None, body=None, orelse=None)

def test_while_loop(state, index=1, test=None, body=None, orelse=None):
    """Test parts of the while loop.

    This test function will allow you to extract parts of a specific while loop and perform a set of tests
    specifically on these parts. A while loop generally consists of two parts: the condition test, :code:`test`,
    which is the condition that is tested each loop, and the :code:`body`. A for while can have a else part as well,
    :code:`orelse`, but this is almost never used.::

        a = 10
        while a < 5:
            print(a)
            a -= 1

    Has :code:`a < 5` as the condition test and `print(i)` as the body.

    Args:
        index (int): index of the function call to be checked. Defaults to 1.
        test: this argument holds the part of code that will be ran to check the condition test of the while loop.
          It should be passed as a lambda expression or a function definition. The functions that are ran should
          be other pythonwhat test functions, and they will be tested specifically on only the condition test of
          the while loop.
        body: this argument holds the part of code that will be ran to check the body of the while loop.
          It should be passed as a lambda expression or a function definition. The functions that are ran should
          be other pythonwhat test functions, and they will be tested specifically on only the body of
          the while loop.
        orelse: this argument holds the part of code that will be ran to check the else part of the while loop.
          It should be passed as a lambda expression or a function definition. The functions that are ran should
          be other pythonwhat test functions, and they will be tested specifically on only the else part of
          the while loop.

    :Example:

        Student code::

            a = 10
            while a < 5:
                print(a)
                a -= 1

        Solution code::

            a = 20
            while a < 5:
                print(a)
                a -= 1

        SCT::

            test_while_loop(1,
                    test = test_expression_result({"a": 5}),
                    body = test_expression_output({"a": 5}))

      This SCT will evaluate to True as condition test will have thes same result in student
      and solution code and `test_exression_output()` will pass on the body code.
    """
    state = check_node(state, "whiles", index - 1, "{{ordinal}} while loop")
    multi(check_part(state, "test", "condition"), test)
    multi(check_part(state, "body", "body"), body)