diff --git a/src/file/document/body/section-properties/page-size/page-size.spec.ts b/src/file/document/body/section-properties/page-size/page-size.spec.ts
new file mode 100644
index 0000000000..4ebcf989c0
--- /dev/null
+++ b/src/file/document/body/section-properties/page-size/page-size.spec.ts
@@ -0,0 +1,26 @@
+import { expect } from "chai";
+
+import { Formatter } from "../../../../../export/formatter";
+import { PageSize } from "./page-size";
+
+describe("PageSize", () => {
+    describe("#constructor()", () => {
+        it("should create page size with portrait", () => {
+            const properties = new PageSize(100, 200, "portrait");
+            const tree = new Formatter().format(properties);
+
+            expect(Object.keys(tree)).to.deep.equal(["w:pgSz"]);
+            expect(tree["w:pgSz"]).to.be.an.instanceof(Array);
+            expect(tree["w:pgSz"][0]).to.deep.equal({ _attr: { "w:h": 200, "w:w": 100, "w:orient": "portrait" } });
+        });
+
+        it("should create page size with horizontal and invert the lengths", () => {
+            const properties = new PageSize(100, 200, "landscape");
+            const tree = new Formatter().format(properties);
+
+            expect(Object.keys(tree)).to.deep.equal(["w:pgSz"]);
+            expect(tree["w:pgSz"]).to.be.an.instanceof(Array);
+            expect(tree["w:pgSz"][0]).to.deep.equal({ _attr: { "w:h": 100, "w:w": 200, "w:orient": "landscape" } });
+        });
+    });
+});