Add test suite

package.json

@@ -7,10 +7,11 @@
   "module": "dist/index.esm.js",
   "scripts": {
     "clean": "rm -rf dist",
-    "lint": "eslint src/ && flow check",
+    "lint": "eslint src/ test/ && flow check",
     "prebuild": "npm run clean && npm run lint",
     "build": "rollup -c && cp src/clipboard-copy-element.js.flow dist/index.esm.js.flow && cp src/clipboard-copy-element.js.flow dist/index.umd.js.flow",
-    "test": "npm run lint",
+    "pretest": "npm run build",
+    "test": "karma start test/karma.config.js",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
@@ -25,9 +26,16 @@
     "babel-plugin-transform-custom-element-classes": "^0.1.0",
     "babel-preset-es2015-rollup": "^3.0.0",
     "babel-preset-flow": "^6.23.0",
+    "chai": "^4.1.2",
     "eslint": "^4.19.0",
     "eslint-plugin-github": "^0.24.0",
     "flow-bin": "^0.68.0",
+    "karma": "^2.0.0",
+    "karma-chai": "^0.1.0",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-mocha": "^1.3.0",
+    "karma-mocha-reporter": "^2.2.5",
+    "mocha": "^5.1.0",
     "rollup": "^0.57.1",
     "rollup-plugin-babel": "^3.0.3"
   }

test/.eslintrc.json

@@ -0,0 +1,12 @@
+{
+  "rules": {
+    "flowtype/require-valid-file-annotation": "off"
+  },
+  "env": {
+    "mocha": true
+  },
+  "globals": {
+    "assert": true
+  },
+  "extends": "../.eslintrc.json"
+}

test/karma.config.js

@@ -0,0 +1,14 @@
+module.exports = function(config) {
+  config.set({
+    frameworks: ['mocha', 'chai'],
+    files: ['../dist/index.umd.js', 'test.js'],
+    reporters: ['mocha'],
+    port: 9876,
+    colors: true,
+    logLevel: config.LOG_INFO,
+    browsers: ['ChromeHeadless'],
+    autoWatch: false,
+    singleRun: true,
+    concurrency: Infinity
+  })
+}

test/test.js

@@ -0,0 +1,14 @@
+describe('clipboard-copy element', function() {
+  describe('element creation', function() {
+    it('creates from document.createElement', function() {
+      const el = document.createElement('clipboard-copy')
+      assert.equal('CLIPBOARD-COPY', el.nodeName)
+      assert(el instanceof window.ClipboardCopyElement)
+    })
+
+    it('creates from constructor', function() {
+      const el = new window.ClipboardCopyElement()
+      assert.equal('CLIPBOARD-COPY', el.nodeName)
+    })
+  })
+})