Add e2e test

Author: captain-yossarian

.vscode/settings.json

@@ -5,7 +5,7 @@
     "**/node_modules": true,
     "**/build": true
   },
-  "editor.formatOnSave": false,
+  "editor.formatOnSave": true,
   "flow.useNPMPackagedFlow": true,
   "javascript.validate.enable": false,
   "jest.pathToJest": "yarn jest --",

e2e/__tests__/__snapshots__/watchModePatterns.test.js.snap

@@ -13,6 +13,57 @@ Pattern Mode Usage
 
 
 
+`;
+
+exports[`can press "p" to filter by file name with invalid regexp 1`] = `
+
+Pattern Mode Usage
+ › Press Esc to exit pattern mode.
+ › Press Enter to filter by a filenames regex pattern.
+
+ pattern › 
+ pattern › *
+
+Please provide valid RegExp
+ pattern › 
+ pattern › [
+
+Please provide valid RegExp
+ pattern › 
+ pattern › b
+ pattern › ba
+ pattern › bar
+
+
+
+`;
+
+exports[`can press "p" to filter by file name with invalid regexp: test results 1`] = `
+"PASS __tests__/bar.spec.js
+PASS __tests__/foo.spec.js"
+`;
+
+exports[`can press "p" to filter by file name with invalid regexp: test results 2`] = `
+"PASS __tests__/bar.spec.js
+  ✓ bar 1
+  ✓ bar 2
+"
+`;
+
+exports[`can press "p" to filter by file name with invalid regexp: test summary 1`] = `
+"Test Suites: 2 passed, 2 total
+Tests:       4 passed, 4 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites."
+`;
+
+exports[`can press "p" to filter by file name with invalid regexp: test summary 2`] = `
+"Test Suites: 1 passed, 1 total
+Tests:       2 passed, 2 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites matching /bar/i."
 `;
 
 exports[`can press "p" to filter by file name: test results 1`] = `

e2e/__tests__/watchModePatterns.test.js

@@ -63,6 +63,28 @@ test('can press "p" to filter by file name', () => {
   expect(status).toBe(0);
 });
 
+test('can press "p" to filter by file name with invalid regexp', () => {
+  const input = [
+    {keys: ['p', '*', '\r', '[', '\r', 'b', 'a', 'r', '\r']},
+    {keys: ['q']},
+  ];
+
+  setupFiles(input);
+  const {status, stdout, stderr} = runJest(DIR, [
+    '--no-watchman',
+    '--watchAll',
+  ]);
+
+  const results = extractSummaries(stderr);
+  expect(stdout).toMatchSnapshot();
+  expect(results).toHaveLength(2);
+  results.forEach(({rest, summary}) => {
+    expect(rest).toMatchSnapshot('test results');
+    expect(summary).toMatchSnapshot('test summary');
+  });
+  expect(status).toBe(0);
+});
+
 test('can press "t" to filter by test name', () => {
   const input = [{keys: ['t', '2', '\r']}, {keys: ['q']}];
   setupFiles(input);