Added tests and native Map fallback

Author: Sharon Rolel

src/simple-map.js

@@ -1,9 +1,13 @@
-export default class SimpleMap {
+export class SimpleMap {
     constructor () {
         this.keys = [];
         this.values = [];
     }
 
+    get size () {
+        return this.keys.length;
+    }
+
     get (key) {
         const index = this.keys.indexOf(key);
 
@@ -17,3 +21,7 @@ export default class SimpleMap {
         return value;
     }
 }
+
+const exportedMap = typeof Map === 'undefined' ? SimpleMap : Map;
+
+export default exportedMap;

tests/simple-map.js

@@ -0,0 +1,35 @@
+import {
+    expect
+} from 'chai';
+import {SimpleMap} from './../src/simple-map';
+
+const getTests = (map) => {
+    return () => {
+        const values = [
+            [1, 'something'],
+            ['1', 'somethingElse'],
+            [{}, []],
+            [null, null]
+        ];
+
+        it('should set', () => {
+            values.forEach(([key, value]) => {
+                map.set(key, value);
+            });
+            expect(map.size).to.equal(values.length);
+        });
+
+        it('should get', () => {
+            values.forEach(([key, value]) => {
+                expect(map.get(key)).to.equal(value);
+            });
+        });
+    };
+};
+
+describe('SimpleMap', () => {
+    context('simple map with primitive or object as keys', getTests(new SimpleMap()));
+    if (typeof Map !== 'undefined') {
+        context('sanity - running tests against native Map', getTests(new Map()));
+    }
+});