add basic basic basic test

Author: meriadec

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "build": "babel src -d lib",
     "lint": "eslint src test",
-    "prettier": "prettier --write \"{src,test}/**/*.js\""
+    "prettier": "prettier --write \"{src,test}/**/*.js\"",
+    "test": "jest test/"
   },
   "keywords": [],
   "author": "Nicolas Garnier",
@@ -26,6 +27,7 @@
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-config-prettier": "^2.6.0",
     "eslint-plugin-import": "^2.8.0",
+    "jest": "^21.2.1",
     "prettier": "^1.7.4"
   }
 }

test/.eslintrc

@@ -0,0 +1,6 @@
+{
+  "globals": {
+    "test": 0,
+    "expect": 0,
+  }
+}

tests/styleguide.json test/fixtures/styleguide.json

@@ -0,0 +1,13 @@
+import fs from 'fs'
+import path from 'path'
+
+import json2mjml from '../src/json2mjml'
+
+const fakeJSON = fs.readFileSync(path.resolve(__dirname, 'fixtures', 'styleguide.json'))
+
+test('converts JSON input to mjml', () => {
+  const input = JSON.parse(fakeJSON)
+  const result = json2mjml(input)
+  expect(typeof result).toBe('string')
+  expect(result.startsWith('<mjml>')).toBe(true)
+})