adding tests

jest/cssTransform.js

@@ -0,0 +1,8 @@
+module.exports = {
+  process() {
+    return 'module.exports = {};'
+  },
+  getCacheKey() {
+    return 'cssTransform'
+  },
+}

jest/fileTransform.js

@@ -0,0 +1,7 @@
+const path = require('path')
+
+module.exports = {
+  process(src, filename) {
+    return `module.exports = ${JSON.stringify(path.basename(filename))};`
+  },
+}

jest/setup.js

@@ -0,0 +1,4 @@
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+
+Enzyme.configure({ adapter: new Adapter() });