Add test for drag and drop handler

src/test/dragAndDropHandler/index.test.ts

@@ -0,0 +1,131 @@
+import { mockElementBoundingClientRect } from "jsdom-testing-mocks";
+
+import { DragAndDropHandler } from "../../dragAndDropHandler";
+import { Node } from "../../node";
+import NodeElement from "../../nodeElement";
+import { Position } from "../../position";
+
+describe(".refresh", () => {
+    it("generates hit areas if there is a current item", () => {
+        const getNodeElementForNode = jest.fn();
+        const getScrollLeft = jest.fn();
+        const openNode = jest.fn();
+        const refreshElements = jest.fn();
+        const triggerEvent = jest.fn();
+
+        const elementForTree = document.createElement("div");
+        document.body.append(elementForTree);
+
+        jest.spyOn(elementForTree, "clientHeight", "get").mockReturnValue(50);
+        jest.spyOn(elementForTree, "clientWidth", "get").mockReturnValue(40);
+
+        const elementForNode1 = document.createElement("div");
+        elementForTree.append(elementForNode1);
+        const elementForNode2 = document.createElement("div");
+        elementForTree.append(elementForNode2);
+
+        jest.spyOn(elementForNode1, "offsetParent", "get").mockReturnValue(
+            elementForTree,
+        );
+        jest.spyOn(elementForNode2, "offsetParent", "get").mockReturnValue(
+            elementForTree,
+        );
+
+        mockElementBoundingClientRect(elementForTree, {
+            height: 40,
+            width: 50,
+            x: 0,
+            y: 0,
+        });
+
+        mockElementBoundingClientRect(elementForNode1, {
+            height: 20,
+            width: 50,
+            x: 0,
+            y: 0,
+        });
+
+        mockElementBoundingClientRect(elementForNode2, {
+            height: 20,
+            width: 50,
+            x: 0,
+            y: 20,
+        });
+
+        const tree = new Node({ isRoot: true });
+
+        const node1 = new Node({ name: "node1" });
+        node1.element = elementForNode1;
+        tree.addChild(node1);
+
+        const node2 = new Node({ name: "node2" });
+        node2.element = elementForNode2;
+        tree.addChild(node2);
+
+        const nodeElement1 = new NodeElement({
+            getScrollLeft,
+            node: node1,
+            treeElement: elementForTree,
+        });
+
+        const nodeElement2 = new NodeElement({
+            getScrollLeft,
+            node: node2,
+            treeElement: elementForTree,
+        });
+
+        const getNodeElement = jest.fn((element) => {
+            if (element == elementForNode1) {
+                return nodeElement1;
+            } else if (element == elementForNode2) {
+                return nodeElement2;
+            } else {
+                return null;
+            }
+        });
+
+        const getTree = jest.fn(() => tree);
+
+        const dragAndDropHandler = new DragAndDropHandler({
+            getNodeElement,
+            getNodeElementForNode,
+            getScrollLeft,
+            getTree,
+            openFolderDelay: false,
+            openNode,
+            refreshElements,
+            slide: false,
+            treeElement: elementForTree,
+            triggerEvent,
+        });
+
+        // Set current item
+        const positionInfo = {
+            originalEvent: new Event("click"),
+            pageX: 10,
+            pageY: 10,
+            target: elementForNode1,
+        };
+
+        dragAndDropHandler.mouseCapture(positionInfo);
+        expect(dragAndDropHandler.currentItem).toBe(nodeElement1);
+
+        // Call refresh
+        dragAndDropHandler.refresh();
+
+        expect(dragAndDropHandler.hitAreas).toMatchObject([
+            expect.objectContaining({
+                bottom: 43,
+                node: node2,
+                position: Position.Inside,
+                top: 20,
+            }),
+            expect.objectContaining({
+                bottom: 66,
+                node: node2,
+                position: Position.After,
+                top: 43,
+            }),
+        ]);
+    });
+});