Add tests and clean up code

src/file/document/body/section-properties/footer-reference/footer-reference.spec.ts

@@ -0,0 +1,42 @@
+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+import { FooterReference } from "./footer-reference";
+import { FooterReferenceType } from "./footer-reference-attributes";
+
+describe("footerReference", () => {
+    it("should create", () => {
+        const footer = new FooterReference({
+            footerType: FooterReferenceType.DEFAULT,
+            footerId: 1,
+        });
+
+        const tree = new Formatter().format(footer);
+
+        expect(tree).to.deep.equal({
+            "w:footerReference": {
+                _attr: {
+                    "r:id": "rId1",
+                    "w:type": "default",
+                },
+            },
+        });
+    });
+
+    it("should create without a footer type", () => {
+        const footer = new FooterReference({
+            footerId: 1,
+        });
+
+        const tree = new Formatter().format(footer);
+
+        expect(tree).to.deep.equal({
+            "w:footerReference": {
+                _attr: {
+                    "r:id": "rId1",
+                    "w:type": "default",
+                },
+            },
+        });
+    });
+});