Add travis ci

.travis.yml

@@ -0,0 +1,7 @@
+language: node_js
+node_js: 14
+dist: bionic
+cache: yarn
+script:
+  - yarn build
+  - yarn lint

package.json

@@ -36,6 +36,7 @@
     "build": "react-scripts build",
     "test": "react-scripts test",
     "eject": "react-scripts eject",
+    "lint": "prettier src/** --check",
     "lint:fix": "prettier src/** -w",
     "deploy": "gh-pages -d build/"
   },

src/App.test.tsx

@@ -1,9 +1,7 @@
 import React from "react";
-import { render, screen } from "@testing-library/react";
+import { render } from "@testing-library/react";
 import App from "./App";
 
 test("renders learn react link", () => {
   render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
 });