import "jest";
import { isFileDragEvent } from "../dom";

describe(isFileDragEvent.name, () => {
  const dragEventConstructor = jest.fn().mockImplementation((type, types) => {
    return { type, bubbles: true, dataTransfer: { types } };
  });

  it("returns true for valid drag events", () => {
    expect(isFileDragEvent(dragEventConstructor("dragstart", ["Files"]))).toBeTruthy();
    expect(isFileDragEvent(dragEventConstructor("dragend", ["Files"]))).toBeTruthy();
    expect(isFileDragEvent(dragEventConstructor("drag", ["Files"]))).toBeTruthy();
    expect(isFileDragEvent(dragEventConstructor("dragover", ["Files"]))).toBeTruthy();
  });

  it("returns false for invalid drag events", () => {
    expect(isFileDragEvent(dragEventConstructor("dragstart", []))).toBeFalsy();
    expect(isFileDragEvent(dragEventConstructor("dragend", []))).toBeFalsy();
    expect(isFileDragEvent(dragEventConstructor("drag", []))).toBeFalsy();
    expect(isFileDragEvent(dragEventConstructor("dragover", []))).toBeFalsy();
    expect(isFileDragEvent(dragEventConstructor("bob", ["Files"]))).toBeFalsy();
  });
});