vue-select/tests/unit/OptionComparator.spec.js

import Select from "../../src/components/Select";

describe("Comparing Options", () => {
  const comparator = Select.methods.optionComparator.bind({
    getOptionKey: Select.props.getOptionKey.default
  });

  it("can compare numbers", () => {
    expect(comparator(1, 2)).toBeFalsy();
    expect(comparator(1, 1)).toBeTruthy();
  });

  it("can compare strings", () => {
    expect(comparator("one", "one")).toBeTruthy();
    expect(comparator("one", "two")).toBeFalsy();
  });

  it("can compare objects", () => {
    //  compare ID keys
    expect(
      comparator({ label: "halo", id: 1 }, { label: "halo", id: 2 })
    ).toBeFalsy();
    //  compare objects
    expect(
      comparator({ label: "halo", value: 1 }, { label: "halo", value: 1 })
    ).toBeTruthy();
    //  compare objects with different orders
    expect(
      comparator({ value: 1, label: "halo" }, { label: "halo", value: 1 })
    ).toBeTruthy();
  });
});