Write tests

src/file/paragraph/run/page-number.spec.ts

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+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+
+import { NumberOfPages, Page } from "./page-number";
+
+describe("Page", () => {
+    describe("#constructor()", () => {
+        it("uses the font name for both ascii and hAnsi", () => {
+            const tree = new Formatter().format(new Page());
+            expect(tree).to.deep.equal({ "w:instrText": [{ _attr: { "xml:space": "preserve" } }, "PAGE"] });
+        });
+    });
+});
+
+describe("NumberOfPages", () => {
+    describe("#constructor()", () => {
+        it("uses the font name for both ascii and hAnsi", () => {
+            const tree = new Formatter().format(new NumberOfPages());
+            expect(tree).to.deep.equal({ "w:instrText": [{ _attr: { "xml:space": "preserve" } }, "NUMPAGES"] });
+        });
+    });
+});