fix: disable tolerance for multiple answers

As tolerance was being only applied to first correct answer. So, disable tolerance and do not apply it in case of multiple correct answers for Numerical input problem type according to the given documentation: https://docs.openedx.org/en/latest/educators/how-tos/course_development/exercise_tools/manage_numerical_input_problem.html#add-a-tolerance:~:text=hints%20to%20problems.-,Add%20Multiple%20Correct%20Responses%20via%20the%20Advanced%20Editor,text%20string%20as%20correct%20answers.

Author: Muhammad Faraz Maqsood

src/editors/containers/ProblemEditor/components/EditProblemView/SettingsWidget/index.jsx

@@ -77,6 +77,7 @@ const SettingsWidget = ({
               updateSettings={updateSettings}
               answers={answers}
               tolerance={settings.tolerance}
+              correctAnswerCount={correctAnswerCount}
             />
           </div>
           )}

src/editors/containers/ProblemEditor/components/EditProblemView/SettingsWidget/settingsComponents/Tolerance/index.jsx

@@ -50,12 +50,20 @@ const ToleranceCard = ({
   tolerance,
   answers,
   updateSettings,
+  correctAnswerCount,
   // inject
   intl,
 }) => {
   const isAnswerRange = isAnswerRangeSet({ answers });
+  const hasMultipleCorrectAnswers = correctAnswerCount > 1;
   let summary = getSummary({ tolerance, intl });
   useEffect(() => { summary = getSummary({ tolerance, intl }); }, [tolerance]);
+  useEffect(() => {
+    if (hasMultipleCorrectAnswers) {
+      updateSettings({ tolerance: { value: null, type: ToleranceTypes.none.type } });
+    }
+  }, [tolerance, hasMultipleCorrectAnswers]);
+
   return (
     <SettingsOption
       title={intl.formatMessage(messages.toleranceSettingTitle)}
@@ -70,6 +78,16 @@ const ToleranceCard = ({
          <FormattedMessage {...messages.toleranceAnswerRangeWarning} />
        </Alert>
        )}
+      {
+        hasMultipleCorrectAnswers
+        && (
+          <Alert
+            variant="info"
+          >
+            <FormattedMessage {...messages.toleranceMultipleAnswersWarning} />
+          </Alert>
+        )
+      }
       <div className="mb-3">
         <span>
           <FormattedMessage {...messages.toleranceSettingText} />
@@ -79,7 +97,7 @@ const ToleranceCard = ({
         <Form.Control
           as="select"
           onChange={handleToleranceTypeChange({ updateSettings, tolerance, answers })}
-          disabled={isAnswerRange}
+          disabled={isAnswerRange || hasMultipleCorrectAnswers}
           value={tolerance.type}
         >
           {Object.keys(ToleranceTypes).map((toleranceType) => (
@@ -91,7 +109,7 @@ const ToleranceCard = ({
             </option>
           ))}
         </Form.Control>
-        { tolerance?.type !== ToleranceTypes.none.type && !isAnswerRange
+        { tolerance?.type !== ToleranceTypes.none.type && (!isAnswerRange || !hasMultipleCorrectAnswers)
           && (
           <Form.Control
             className="mt-4"
@@ -114,6 +132,7 @@ ToleranceCard.propTypes = {
     type: PropTypes.string,
     value: PropTypes.oneOfType([PropTypes.number, PropTypes.any]),
   }).isRequired,
+  correctAnswerCount: PropTypes.number.isRequired,
   answers: PropTypes.arrayOf(PropTypes.shape({
     correct: PropTypes.bool,
     id: PropTypes.string,

src/editors/containers/ProblemEditor/components/EditProblemView/SettingsWidget/settingsComponents/Tolerance/index.test.jsx

@@ -110,6 +110,40 @@ describe('ToleranceCard', () => {
       expect(NumberText).toBeDefined();
       expect(screen.getByTestId('select').getAttributeNames().includes('disabled')).toBeTruthy();
     });
+    it('If there are multiple correct answers, show multiple correct answers warning message and disable dropdown.', () => {
+      const rangeprops = {
+        answers: [{
+          id: 'A',
+          correct: true,
+          selectedFeedback: '',
+          title: 'An Answer A',
+          isAnswerRange: false,
+          unselectedFeedback: '',
+        },
+        {
+          id: 'B',
+          correct: true,
+          selectedFeedback: '',
+          title: 'An Answer B',
+          isAnswerRange: false,
+          unselectedFeedback: '',
+        },
+        ],
+        updateSettings: jest.fn(),
+        intl: {
+          formatMessage,
+        },
+      };
+
+      render(<ToleranceCard
+        tolerance={mockToleranceNumber}
+        correctAnswerCount={2}
+        {...rangeprops}
+      />);
+      const warningMessage = screen.getByText(messages.toleranceMultipleAnswersWarning.defaultMessage);
+      expect(warningMessage).toBeDefined();
+      expect(screen.getByTestId('select').getAttributeNames().includes('disabled')).toBeTruthy();
+    });
   });
   describe('Type Select', () => {
     it('Renders the types for selection', async () => {

src/editors/containers/ProblemEditor/components/EditProblemView/SettingsWidget/settingsComponents/Tolerance/messages.js

@@ -24,7 +24,12 @@ const messages = defineMessages({
   toleranceAnswerRangeWarning: {
     id: 'problemEditor.settings.tolerance.answerrangewarning',
     defaultMessage: 'Tolerance cannot be applied to an answer range',
-    description: 'a warning to users that tolerance cannot be aplied to an answer range.',
+    description: 'a warning to users that tolerance cannot be applied to an answer range.',
+  },
+  toleranceMultipleAnswersWarning: {
+    id: 'problemEditor.settings.tolerance.toleranceMultipleAnswersWarning',
+    defaultMessage: 'Tolerance cannot be applied to multiple correct answers',
+    description: 'a warning to users that tolerance cannot be applied to multiple correct answers.',
   },
   typesPercentage: {
     id: 'problemEditor.settings.tolerance.type.percent',