test(Form): cover onSubmit w/ unit tests

packages/vkui/src/components/Form/Form.test.tsx

@@ -1,6 +1,46 @@
+import * as React from 'react';
+import { createEvent, fireEvent, render } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
 import { baselineComponent } from '../../testing/utils';
+import { Button } from '../Button/Button';
 import { Form } from './Form';
 
 describe('Form', () => {
   baselineComponent(Form);
+
+  describe('checks e.preventDefault()', () => {
+    const handlePreventDefault = (preventDefault = true) => {
+      const { getByTestId } = render(
+        <Form data-testid="form" preventDefault={preventDefault}>
+          <Button type="submit">__submit__</Button>
+        </Form>,
+      );
+      const form = getByTestId('form');
+      const submitForm = createEvent.submit(form);
+
+      fireEvent(form, submitForm);
+      expect(submitForm.defaultPrevented).toBe(preventDefault);
+    };
+
+    it('if preventDefault={true} call e.preventDefault()', () => {
+      return handlePreventDefault(true);
+    });
+
+    it("if preventDefault={false} DON'T call e.preventDefault()", () => {
+      return handlePreventDefault(false);
+    });
+  });
+
+  it('calls passed onSubmit()', () => {
+    const onSubmit = jest.fn();
+
+    const { getByText } = render(
+      <Form onSubmit={onSubmit}>
+        <Button type="submit">__submit__</Button>
+      </Form>,
+    );
+
+    userEvent.click(getByText('__submit__'));
+    expect(onSubmit).toBeCalledTimes(1);
+  });
 });