excalidraw/src/tests/move.test.tsx

import React from "react";
import ReactDOM from "react-dom";
import { render, fireEvent } from "./test-utils";
import { App } from "../components/App";
import * as Renderer from "../renderer/renderScene";
import { reseed } from "../random";

// Unmount ReactDOM from root
ReactDOM.unmountComponentAtNode(document.getElementById("root")!);

const renderScene = jest.spyOn(Renderer, "renderScene");
beforeEach(() => {
  localStorage.clear();
  renderScene.mockClear();
  reseed(7);
});

const { h } = window;

describe("move element", () => {
  it("rectangle", () => {
    const { getByToolName, container } = render(<App />);
    const canvas = container.querySelector("canvas")!;

    {
      // create element
      const tool = getByToolName("rectangle");
      fireEvent.click(tool);
      fireEvent.pointerDown(canvas, { clientX: 30, clientY: 20 });
      fireEvent.pointerMove(canvas, { clientX: 60, clientY: 70 });
      fireEvent.pointerUp(canvas);

      expect(renderScene).toHaveBeenCalledTimes(4);
      expect(h.state.selectionElement).toBeNull();
      expect(h.elements.length).toEqual(1);
      expect(h.state.selectedElementIds[h.elements[0].id]).toBeTruthy();
      expect([h.elements[0].x, h.elements[0].y]).toEqual([30, 20]);

      renderScene.mockClear();
    }

    fireEvent.pointerDown(canvas, { clientX: 50, clientY: 20 });
    fireEvent.pointerMove(canvas, { clientX: 20, clientY: 40 });
    fireEvent.pointerUp(canvas);

    expect(renderScene).toHaveBeenCalledTimes(3);
    expect(h.state.selectionElement).toBeNull();
    expect(h.elements.length).toEqual(1);
    expect([h.elements[0].x, h.elements[0].y]).toEqual([0, 40]);

    h.elements.forEach((element) => expect(element).toMatchSnapshot());
  });
});

describe("duplicate element on move when ALT is clicked", () => {
  it("rectangle", () => {
    const { getByToolName, container } = render(<App />);
    const canvas = container.querySelector("canvas")!;

    {
      // create element
      const tool = getByToolName("rectangle");
      fireEvent.click(tool);
      fireEvent.pointerDown(canvas, { clientX: 30, clientY: 20 });
      fireEvent.pointerMove(canvas, { clientX: 60, clientY: 70 });
      fireEvent.pointerUp(canvas);

      expect(renderScene).toHaveBeenCalledTimes(4);
      expect(h.state.selectionElement).toBeNull();
      expect(h.elements.length).toEqual(1);
      expect(h.state.selectedElementIds[h.elements[0].id]).toBeTruthy();
      expect([h.elements[0].x, h.elements[0].y]).toEqual([30, 20]);

      renderScene.mockClear();
    }

    fireEvent.pointerDown(canvas, { clientX: 50, clientY: 20, altKey: true });
    fireEvent.pointerMove(canvas, { clientX: 20, clientY: 40 });
    fireEvent.pointerUp(canvas);

    expect(renderScene).toHaveBeenCalledTimes(3);
    expect(h.state.selectionElement).toBeNull();
    expect(h.elements.length).toEqual(2);

    // previous element should stay intact
    expect([h.elements[0].x, h.elements[0].y]).toEqual([30, 20]);
    expect([h.elements[1].x, h.elements[1].y]).toEqual([0, 40]);

    h.elements.forEach((element) => expect(element).toMatchSnapshot());
  });
});