Add cli tests

package.json

@@ -54,6 +54,7 @@
     "babel-cli": "^6.9.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.9.0",
+    "child-process-promise": "^2.0.2",
     "coveralls": "^2.11.9",
     "eslint": "^2.11.1",
     "eslint-config-lukechilds": "^1.5.1",

test/unit.js

@@ -1,9 +1,11 @@
 import test from 'ava';
 
 import { readFileSync } from 'fs';
+import { exec } from 'child-process-promise';
 import htconvert from '../dist/htconvert';
 
-const input = readFileSync('./fixtures/input', 'utf-8');
+const inputPath = './fixtures/input';
+const input = readFileSync(inputPath, 'utf-8');
 const output = readFileSync('./fixtures/output', 'utf-8');
 
 test('htconvert should export a function', t => {
@@ -13,3 +15,21 @@ test('htconvert should export a function', t => {
 test('htconvert should match input with output', t => {
   t.is(htconvert(input), output);
 });
+
+test('cli input with -f arg', t => {
+  return exec(`node ../dist/cli.js -f ${inputPath}`).then(result => {
+    t.is(result.stdout, output+'\n');
+  });
+});
+
+test('cli input with --file arg', t => {
+  return exec(`node ../dist/cli.js --file ${inputPath}`).then(result => {
+    t.is(result.stdout, output+'\n');
+  });
+});
+
+test('cli input from stdin', t => {
+  return exec(`echo "${input}" | node ../dist/cli.js`).then(result => {
+    t.is(result.stdout, output+'\n\n');
+  });
+});