add support for floating drawings

- added need elements and test for them

src/file/drawing/floating/horizontal-position.spec.ts

@@ -0,0 +1,41 @@
+import { assert } from "chai";
+
+import { HorizontalPosition } from "./horizontal-position";
+import { Utility } from "../../../tests/utility";
+import { HorizontalPositionRelativeFrom, HorizontalPositionAlign } from ".";
+
+describe("HorizontalPosition", () => {
+    describe("#constructor()", () => {
+        it("should create a element with position align", () => {
+            const newJson = Utility.jsonify(
+                new HorizontalPosition({
+                    relative: HorizontalPositionRelativeFrom.MARGIN,
+                    align: HorizontalPositionAlign.CENTER,
+                }),
+            );
+            assert.equal(newJson.rootKey, "wp:positionH");
+            assert.include(newJson.root[0].root, {
+                relativeFrom: "margin",
+            });
+
+            assert.equal(newJson.root[1].rootKey, "wp:align");
+            assert.include(newJson.root[1].root, "center");
+        });
+
+        it("should create a element with offset", () => {
+            const newJson = Utility.jsonify(
+                new HorizontalPosition({
+                    relative: HorizontalPositionRelativeFrom.MARGIN,
+                    offset: 40,
+                }),
+            );
+            assert.equal(newJson.rootKey, "wp:positionH");
+            assert.include(newJson.root[0].root, {
+                relativeFrom: "margin",
+            });
+
+            assert.equal(newJson.root[1].rootKey, "wp:posOffset");
+            assert.include(newJson.root[1].root[0], 40);
+        });
+    });
+});