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dashboard/src/App.test.js

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+import { cleanup, render, screen } from '@testing-library/react';
+import App from './App';
+
+afterEach(cleanup)
+
+test('render cohort panel', () => {
+  render(<App />);
+  const cohortElem = screen.getByText("Cohort");
+  expect(cohortElem).toHaveClass("btn-primary");
+});
+
+test('render individual panel', () => {
+    render(<App />);
+    const individualElem = screen.getByText("Individual");
+    expect(individualElem).toHaveClass("btn-secondary");
+  });