test: add cli test

Author: KnisterPeter

package-lock.json

@@ -40,6 +40,7 @@
     "@knisterpeter/standard-tslint": "^1.6.0",
     "@types/babel-generator": "^6.25.0",
     "@types/diff": "^3.2.2",
+    "@types/execa": "0.8.0",
     "@types/node": "^8.0.50",
     "@types/prop-types": "15.5.2",
     "@types/react": "^16.0.21",
@@ -52,6 +53,7 @@
     "coveralls": "^3.0.0",
     "cz-conventional-changelog": "2.1.0",
     "diff": "3.4.0",
+    "execa": "0.8.0",
     "nyc": "11.3.0",
     "prop-types": "15.6.0",
     "react": "^16.0.0",

package.json

@@ -0,0 +1,27 @@
+import test from 'ava';
+import { shell } from 'execa';
+import * as fs from 'fs';
+
+function normalize(input: string): string {
+  return input
+    .replace(/\s+/g, ' ')
+    .replace(/ => /g, '=>');
+}
+
+test('cli should read from stdin', async t => {
+  const expected = fs.readFileSync('./tests/import-react-component.d.ts').toString();
+
+  const result = await shell(
+    `cat ./tests/import-react-component.jsx |${process.argv[0]} ./cli.js --module-name component`);
+
+  t.is(normalize(result.stdout), normalize(expected));
+});
+
+test('cli should read from file', async t => {
+  const expected = fs.readFileSync('./tests/import-react-component.d.ts').toString();
+
+  const result = await shell(
+    `${process.argv[0]} ./cli.js --module-name component --file ./tests/import-react-component.jsx`);
+
+  t.is(normalize(result.stdout), normalize(expected));
+});