fix: Remove retry button in LTI Proctorio exams

src/instructions/practice_exam/SubmittedPracticeExamInstructions.jsx

@@ -1,12 +1,15 @@
 import React from 'react';
-import { useDispatch } from 'react-redux';
+import { useDispatch, useSelector } from 'react-redux';
 import { FormattedMessage } from '@edx/frontend-platform/i18n';
 import { Button } from '@openedx/paragon';
 
 import { resetExam } from '../../data';
 
 const SubmittedPracticeExamInstructions = () => {
   const dispatch = useDispatch();
+  const { exam } = useSelector(state => state.specialExams);
+
+  const examHasLtiProvider = !exam?.attempt?.use_legacy_attempt_api;
 
   return (
     <div>
@@ -23,16 +26,18 @@ const SubmittedPracticeExamInstructions = () => {
           + 'completed this practice exam and can continue with your course work.'}
         />
       </p>
-      <Button
-        data-testid="retry-exam-button"
-        variant="primary"
-        onClick={() => dispatch(resetExam())}
-      >
-        <FormattedMessage
-          id="exam.SubmittedPracticeExamInstructions.retryExamButton"
-          defaultMessage="Retry my exam"
-        />
-      </Button>
+      {!examHasLtiProvider ? (
+        <Button
+          data-testid="retry-exam-button"
+          variant="primary"
+          onClick={() => dispatch(resetExam())}
+        >
+          <FormattedMessage
+            id="exam.SubmittedPracticeExamInstructions.retryExamButton"
+            defaultMessage="Retry my exam"
+          />
+        </Button>
+      ) : null}
     </div>
   );
 };

src/instructions/practice_exam/SubmittedPracticeExamInstructions.test.jsx

@@ -0,0 +1,85 @@
+import React from 'react';
+import { SubmittedPracticeExamInstructions } from './index';
+import {
+  render, screen, initializeTestStore, fireEvent,
+} from '../../setupTest';
+
+const mockresetReturn = {};
+const mockDispatch = jest.fn();
+
+jest.mock('react-redux', () => ({
+  ...jest.requireActual('react-redux'),
+  useDispatch: () => mockDispatch,
+}));
+
+jest.mock('../../data', () => ({
+  ...jest.requireActual('../../data'),
+  resetExam: () => mockresetReturn,
+}));
+
+describe('ExamTimerBlock', () => {
+  afterEach(() => {
+    jest.resetAllMocks();
+  });
+
+  describe('when no LTI provider is used', () => {
+    beforeEach(() => {
+      const preloadedState = {
+        specialExams: {
+          exam: {
+            attempt: {
+              use_legacy_attempt_api: true,
+            },
+          },
+        },
+      };
+      initializeTestStore(preloadedState);
+
+      render(
+        <SubmittedPracticeExamInstructions />,
+      );
+    });
+
+    it('renders the component correctly', async () => {
+      expect(screen.getByText('You have submitted this practice proctored exam')).toBeInTheDocument();
+      expect(screen.getByText(
+        'Practice exams do not affect your grade. You have '
+        + 'completed this practice exam and can continue with your course work.',
+      )).toBeInTheDocument();
+      expect(screen.queryByTestId('retry-exam-button')).toBeInTheDocument();
+    });
+
+    it('calls resetExam() when clicking the retry button', () => {
+      expect(mockDispatch).not.toHaveBeenCalled();
+
+      fireEvent.click(screen.getByTestId('retry-exam-button'));
+
+      expect(mockDispatch).toHaveBeenCalledTimes(1);
+      expect(mockDispatch).toHaveBeenCalledWith(mockresetReturn);
+    });
+  });
+
+  describe('when an LTI provider is used', () => {
+    beforeEach(() => {
+      const preloadedState = {
+        specialExams: {
+          exam: {},
+        },
+      };
+      initializeTestStore(preloadedState);
+
+      render(
+        <SubmittedPracticeExamInstructions />,
+      );
+    });
+
+    it('doesn\'t show the button if it has an LTI provider', async () => {
+      expect(screen.getByText('You have submitted this practice proctored exam')).toBeInTheDocument();
+      expect(screen.getByText(
+        'Practice exams do not affect your grade. You have '
+        + 'completed this practice exam and can continue with your course work.',
+      )).toBeInTheDocument();
+      expect(screen.queryByTestId('retry-exam-button')).not.toBeInTheDocument();
+    });
+  });
+});