Add OutlineLevel Paragraph property

src/file/paragraph/links/outline-level.spec.ts

@@ -0,0 +1,23 @@
+import { assert } from "chai";
+
+import { Utility } from "tests/utility";
+
+import { OutlineLevel } from "./outline-level";
+
+describe("ParagraphOutlineLevel", () => {
+    let outlineLevel: OutlineLevel;
+
+    describe("#constructor()", () => {
+        it("should create an outlineLevel with given value", () => {
+            outlineLevel = new OutlineLevel("0");
+            const newJson = Utility.jsonify(outlineLevel);
+            assert.equal(newJson.root[0].root.val, "0");
+        });
+
+        it("should create an outlineLevel with blank val", () => {
+            outlineLevel = new OutlineLevel("");
+            const newJson = Utility.jsonify(outlineLevel);
+            assert.equal(newJson.root[0].root.val, "");
+        });
+    });
+});