Add test

packages/examples/packages/preinstalled/src/index.test.tsx

@@ -0,0 +1,64 @@
+import { expect } from '@jest/globals';
+import { installSnap } from '@metamask/snaps-jest';
+
+import { Dialog, Result } from './components';
+
+describe('onRpcRequest', () => {
+  it('throws an error if the requested method does not exist', async () => {
+    const { request } = await installSnap();
+
+    const response = await request({
+      method: 'foo',
+    });
+
+    expect(response).toRespondWithError({
+      code: -32601,
+      message: 'The method does not exist / is not available.',
+      stack: expect.any(String),
+      data: {
+        method: 'foo',
+        cause: null,
+      },
+    });
+  });
+
+  describe('showDialog', () => {
+    it('closes the dialog when clicking cancel, and resolves with `null`', async () => {
+      const { request } = await installSnap();
+
+      const response = request({
+        method: 'showDialog',
+      });
+
+      const formScreen = await response.getInterface();
+      expect(formScreen).toRender(<Dialog />);
+
+      await formScreen.clickElement('cancel');
+
+      const result = await response;
+      expect(result).toRespondWith(null);
+    });
+
+    it('shows the result when clicking confirm, and resolves with the result', async () => {
+      const { request } = await installSnap();
+
+      const response = request({
+        method: 'showDialog',
+      });
+
+      const formScreen = await response.getInterface();
+      expect(formScreen).toRender(<Dialog />);
+
+      await formScreen.typeInField('custom-input', 'foo bar');
+      await formScreen.clickElement('confirm');
+
+      const resultScreen = await response.getInterface();
+      expect(resultScreen).toRender(<Result value="foo bar" />);
+
+      await resultScreen.clickElement('ok');
+
+      const result = await response;
+      expect(result).toRespondWith('foo bar');
+    });
+  });
+});