Implemented unit tests for <customresponse>

common/lib/capa/capa/tests/response_xml_factory.py

+from lxml import etree
+from abc import ABCMeta, abstractmethod
+
+class ResponseXMLFactory(object):
+    """ Abstract base class for capa response XML factories.
+    Subclasses override create_response_element and
+    create_input_element to produce XML of particular response types"""
+
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def create_response_element(self, **kwargs):
+        """ Subclasses override to return an etree element
+        representing the capa response XML
+        (e.g. <numericalresponse>).
+        
+        The tree should NOT contain any input elements
+        (such as <textline />) as these will be added later."""
+        return None
+
+    @abstractmethod
+    def create_input_element(self, **kwargs):
+        """ Subclasses override this to return an etree element
+        representing the capa input XML (such as <textline />)"""
+        return None
+
+    def build_xml(self, **kwargs):
+        """ Construct an XML string for a capa response 
+        based on **kwargs.
+
+        **kwargs is a dictionary that will be passed
+        to create_response_element() and create_input_element().
+        See the subclasses below for other keyword arguments
+        you can specify.
+
+        For all response types, **kwargs can contain:
+
+        'question_text': The text of the question to display,
+            wrapped in <p> tags.
+        
+        'explanation_text': The detailed explanation that will
+            be shown if the user answers incorrectly.
+
+        'script': The embedded Python script (a string)
+
+        'num_inputs': The number of input elements
+            to create [DEFAULT: 1]
+
+        Returns a string representation of the XML tree.
+        """
+
+        # Retrieve keyward arguments
+        question_text = kwargs.get('question_text', '')
+        explanation_text = kwargs.get('explanation_text')
+        script = kwargs.get('script', None)
+        num_inputs = kwargs.get('num_inputs', 1)
+
+        # The root is <problem>
+        root = etree.Element("problem")
+
+        # Add a script if there is one
+        if script:
+            script_element = etree.SubElement(root, "script")
+            script_element.set("type", "loncapa/python")
+            script_element.text = str(script)
+
+        # The problem has a child <p> with question text
+        question = etree.SubElement(root, "p")
+        question.text = question_text
+
+        # Add the response
+        response_element = self.create_response_element(**kwargs)
+        root.append(response_element)
+        
+        # Add input elements
+        for i in range(0, int(num_inputs)):
+            input_element = self.create_input_element(**kwargs)
+            response_element.append(input_element)
+
+        # The problem has an explanation of the solution
+        explanation = etree.SubElement(root, "solution")
+        explanation_div = etree.SubElement(explanation, "div")
+        explanation_div.set("class", "detailed-solution")
+        explanation_div.text = explanation_text
+
+        return etree.tostring(root)
+
+    @staticmethod
+    def textline_input_xml(**kwargs):
+        """ Create a <textline/> XML element
+
+        Uses **kwargs:
+
+        'math_display': If True, then includes a MathJax display of user input
+
+        'size': An integer representing the width of the text line
+        """
+        math_display = kwargs.get('math_display', False)
+        size = kwargs.get('size', None)
+
+        input_element = etree.Element('textline')
+
+        if math_display:
+            input_element.set('math', '1')
+
+        if size:
+            input_element.set('size', str(size))
+
+        return input_element
+
+class NumericalResponseXMLFactory(ResponseXMLFactory):
+    """ Factory for producing <numericalresponse> XML trees """
+
+    def create_response_element(self, **kwargs):
+        """ Create a <numericalresponse> XML element.
+        Uses **kwarg keys:
+
+        'answer': The correct answer (e.g. "5")
+
+        'tolerance': The tolerance within which a response
+        is considered correct.  Can be a decimal (e.g. "0.01")
+        or percentage (e.g. "2%")
+        """
+
+        answer = kwargs.get('answer', None)
+        tolerance = kwargs.get('tolerance', None)
+
+        response_element = etree.Element('numericalresponse')
+
+        if answer:
+            response_element.set('answer', str(answer))
+
+        if tolerance:
+            responseparam_element = etree.SubElement(response_element, 'responseparam')
+            responseparam_element.set('type', 'tolerance')
+            responseparam_element.set('default', str(tolerance))
+
+        return response_element
+
+    def create_input_element(self, **kwargs):
+        return ResponseXMLFactory.textline_input_xml(**kwargs)
+
+class CustomResponseXMLFactory(ResponseXMLFactory):
+    """ Factory for producing <customresponse> XML trees """
+
+    def create_response_element(self, **kwargs):
+        """ Create a <customresponse> XML element.
+
+        Use **kwargs:
+
+        'cfn': the Python code to run.  Can be inline code,
+        or the name of a function defined in earlier <script> tags.
+
+        Should have the form: cfn(expect, ans)
+        where expect is a value (see below) 
+        and ans is a list of values.
+
+        'expect': The value passed as the first argument to the function cfn
+
+        'answer': Inline script that calculates the answer
+        """
+        
+        # Retrieve **kwargs
+        cfn = kwargs.get('cfn', None)
+        expect = kwargs.get('expect', None)
+        answer = kwargs.get('answer', None)
+
+        # Create the response element
+        response_element = etree.Element("customresponse")
+
+        if cfn:
+            response_element.set('cfn', str(cfn))
+
+        if expect:
+            response_element.set('expect', str(expect))
+
+        if answer:
+            answer_element = etree.SubElement(response_element, "answer")
+            answer_element.text = str(answer)
+
+        return response_element
+
+    def create_input_element(self, **kwargs):
+        return ResponseXMLFactory.textline_input_xml(**kwargs)

common/lib/capa/capa/tests/test_responsetypes.py

@@ -493,3 +493,119 @@ class NumericalResponseTest(unittest.TestCase):
         for input_str in incorrect_answers:
             result = problem.grade_answers({'1_2_1': input_str}).get_correctness('1_2_1')
             self.assertEqual(result, 'incorrect')
+
+from response_xml_factory import CustomResponseXMLFactory
+class CustomResponseTest(unittest.TestCase):
+
+    def setUp(self):
+        self.xml_factory = CustomResponseXMLFactory()
+
+    def test_inline_code(self):
+
+        # For inline code, we directly modify global context variables
+        # 'answers' is a list of answers provided to us
+        # 'correct' is a list we fill in with True/False
+        # 'expect' is given to us (if provided in the XML)
+        inline_script = """correct[0] = 'correct' if (answers['1_2_1'] == expect) else 'incorrect'"""
+
+        xml = self.xml_factory.build_xml(answer=inline_script, expect="42")
+
+        problem = lcp.LoncapaProblem(xml, '1', system=test_system)
+
+        # Correct answer
+        input_dict = {'1_2_1': '42'}
+        result = problem.grade_answers(input_dict).get_correctness('1_2_1')
+        self.assertEqual(result, 'correct')
+
+        # Incorrect answer
+        input_dict = {'1_2_1': '0'}
+        result = problem.grade_answers(input_dict).get_correctness('1_2_1')
+        self.assertEqual(result, 'incorrect')
+
+    def test_inline_message(self):
+
+        # Inline code can update the global messages list
+        # to pass messages to the CorrectMap for a particular input
+        inline_script = """messages[0] = "Test Message" """
+
+        xml = self.xml_factory.build_xml(answer=inline_script)
+        problem = lcp.LoncapaProblem(xml, '1', system=test_system)
+
+        input_dict = {'1_2_1': '0'}
+        msg = problem.grade_answers(input_dict).get_msg('1_2_1')
+        self.assertEqual(msg, "Test Message")
+
+    def test_function_code(self):
+
+        # For function code, we pass in three arguments:
+        # 
+        #   'expect' is the expect attribute of the <customresponse>
+        #
+        #   'answer_given' is the answer the student gave (if there is just one input)
+        #       or an ordered list of answers (if there are multiple inputs)
+        #   
+        #   'student_answers' is a dictionary of answers by input ID
+        #
+        #
+        # The function should return a dict of the form 
+        # { 'ok': BOOL, 'msg': STRING }
+        #
+        script = """def check_func(expect, answer_given, student_answers):
+    return {'ok': answer_given == expect, 'msg': 'Message text'}"""
+
+        xml = self.xml_factory.build_xml(script=script, cfn="check_func", expect="42")
+        problem = lcp.LoncapaProblem(xml, '1', system=test_system)
+
+        # Correct answer
+        input_dict = {'1_2_1': '42'}
+        correct_map = problem.grade_answers(input_dict)
+
+        correctness = correct_map.get_correctness('1_2_1')
+        msg = correct_map.get_msg('1_2_1')
+
+        self.assertEqual(correctness, 'correct')
+        self.assertEqual(msg, "Message text\n")
+
+        # Incorrect answer
+        input_dict = {'1_2_1': '0'}
+        correct_map = problem.grade_answers(input_dict)
+
+        correctness = correct_map.get_correctness('1_2_1')
+        msg = correct_map.get_msg('1_2_1')
+
+        self.assertEqual(correctness, 'incorrect')
+        self.assertEqual(msg, "Message text\n")
+
+    def test_multiple_inputs(self):
+        # When given multiple inputs, the 'answer_given' argument
+        # to the check_func() is a list of inputs
+        # The sample script below marks the problem as correct
+        # if and only if it receives answer_given=[1,2,3]
+        # (or string values ['1','2','3'])
+        script = """def check_func(expect, answer_given, student_answers):
+    check1 = (int(answer_given[0]) == 1)
+    check2 = (int(answer_given[1]) == 2)
+    check3 = (int(answer_given[2]) == 3)
+    return {'ok': (check1 and check2 and check3),  'msg': 'Message text'}"""
+
+        xml = self.xml_factory.build_xml(script=script, 
+                                        cfn="check_func", num_inputs=3)
+        problem = lcp.LoncapaProblem(xml, '1', system=test_system)
+
+        # Grade the inputs (one input incorrect)
+        input_dict = {'1_2_1': '-999', '1_2_2': '2', '1_2_3': '3' }
+        correct_map = problem.grade_answers(input_dict)
+
+        # Everything marked incorrect
+        self.assertEqual(correct_map.get_correctness('1_2_1'), 'incorrect')
+        self.assertEqual(correct_map.get_correctness('1_2_2'), 'incorrect')
+        self.assertEqual(correct_map.get_correctness('1_2_3'), 'incorrect')
+
+        # Grade the inputs (everything correct)
+        input_dict = {'1_2_1': '1', '1_2_2': '2', '1_2_3': '3' }
+        correct_map = problem.grade_answers(input_dict)
+
+        # Everything marked incorrect
+        self.assertEqual(correct_map.get_correctness('1_2_1'), 'correct')
+        self.assertEqual(correct_map.get_correctness('1_2_2'), 'correct')
+        self.assertEqual(correct_map.get_correctness('1_2_3'), 'correct')