Add minimal karma setup

Author: fredj

package.json

@@ -14,10 +14,20 @@
   "author": "Andreas Hocevar",
   "license": "BSD-2-Clause",
   "scripts": {
+    "karma": "karma start test/karma.conf.js",
     "lint": "eslint *.js"
   },
   "devDependencies": {
     "eslint": "^5.15.0",
-    "eslint-config-openlayers": "^11.0.0"
+    "eslint-config-openlayers": "^11.0.0",
+    "karma": "^4.0.1",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-mocha": "^1.3.0",
+    "karma-webpack": "^3.0.5",
+    "mocha": "^6.0.2",
+    "puppeteer": "^1.13.0",
+    "should": "^13.2.3",
+    "sinon": "^7.2.7",
+    "webpack": "^4.29.6"
   }
 }

test/index.test.js

@@ -0,0 +1,14 @@
+import should from 'should';
+import parseFont from '../index';
+
+describe('mapbox-to-css-font', function() {
+
+  describe('parseFont', function() {
+    it('handle font-weight', function() {
+      should(parseFont('Noto Sans', 16)).eql('normal 400 16px "Noto Sans"');
+      should(parseFont('Noto Sans Bold', 16)).eql('normal 700 16px "Noto Sans"');
+      should(parseFont('Noto Sans SemiBold Italic', 16)).eql('italic 600 16px "Noto Sans"');
+    });
+  });
+
+});

test/karma.conf.js

@@ -0,0 +1,17 @@
+const path = require('path');
+
+module.exports = function(karma) {
+  karma.set({
+    frameworks: ['mocha'],
+    files: [{
+      pattern: path.resolve(__dirname, './index.test.js')
+    }],
+    preprocessors: {
+      '**/*.js': ['webpack']
+    },
+    webpack: {
+      mode: 'development'
+    },
+    browsers: ['ChromeHeadless']
+  });
+};