wrote lots of tests

ts/tests/docx/run/tabTests.ts

@@ -0,0 +1,22 @@
+import {Tab} from "../../../docx/run/tab";
+import {assert} from "chai";
+
+function jsonify(obj: Object) {
+    let stringifiedJson = JSON.stringify(obj);
+    return JSON.parse(stringifiedJson);
+}
+
+describe("Tab", () => {
+    let tab: Tab;
+
+    beforeEach(() => {
+        tab = new Tab();
+    });
+
+    describe("#constructor()", () => {
+        it("should create a Tab with correct root key", () => {
+            let newJson = jsonify(tab);
+            assert.equal(newJson.rootKey, "w:tab");
+        });
+    });
+});