text: import concatMut from "../src/concat-mut";
  
  it("concatenates arrays into with an existing array", () => {
  	const arr = [1, 2, 3],
  		concatenated = concatMut(arr, [4, 5, 6], [7, 8, 9]);
  
  	expect(concatenated).toBe(arr);
  	expect(concatenated).toStrictEqual([1, 2, 3, 4, 5, 6, 7, 8, 9]);
  });
  
  it("concatenates non-array arguments as individual components", () => {
  	expect(concatMut([], 1, 2, [3, 4, 5], 6)).toStrictEqual([1, 2, 3, 4, 5, 6]);
  });
  