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67 lines
2.7 KiB
TypeScript
67 lines
2.7 KiB
TypeScript
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import { CompositeComparer } from "@/utils/comparison/composite-comparer";
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describe("CompositeComparer", () => {
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describe("create", () => {
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test("creates a new instance from the given comparer", () => {
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const comparer = CompositeComparer.create((a: number, b: number) => a - b);
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expect(comparer).toBeInstanceOf(CompositeComparer);
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});
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});
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describe("compare", () => {
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test("compares two numbers using the original comparer", () => {
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const comparer = CompositeComparer.create((a: number, b: number) => a - b);
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expect(comparer.compare(5, 3)).toBeGreaterThan(0);
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expect(comparer.compare(3, 5)).toBeLessThan(0);
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expect(comparer.compare(5, 5)).toEqual(0);
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});
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});
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describe("__invoke__", () => {
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test("can be used as a function", () => {
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const comparer = CompositeComparer.create((a: number, b: number) => a - b);
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expect(comparer(5, 3)).toBeGreaterThan(0);
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expect(comparer(3, 5)).toBeLessThan(0);
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expect(comparer(5, 5)).toEqual(0);
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});
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});
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describe("thenBy", () => {
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test("chains comparers in the right order", () => {
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const firstCompare = (a: [number, string], b: [number, string]) => a[0] - b[0];
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const secondCompare = (a: [number, string], b: [number, string]) => a[1].localeCompare(b[1]);
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const comparer = CompositeComparer.create(firstCompare).thenBy(secondCompare);
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expect(comparer.compare([1, "b"], [2, "a"])).toBeLessThan(0);
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expect(comparer.compare([2, "a"], [1, "b"])).toBeGreaterThan(0);
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expect(comparer.compare([1, "a"], [1, "b"])).toBeLessThan(0);
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expect(comparer.compare([1, "b"], [1, "a"])).toBeGreaterThan(0);
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expect(comparer.compare([1, "a"], [1, "a"])).toEqual(0);
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});
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});
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describe("invert", () => {
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test("inverts comparisons", () => {
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const comparer = CompositeComparer.create((a: number, b:number) => a - b).invert();
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expect(comparer.compare(5, 3)).toBeLessThan(0);
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expect(comparer.compare(3, 5)).toBeGreaterThan(0);
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expect(comparer.compare(5, 5)).toEqual(0);
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});
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});
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describe("asEqualityComparer", () => {
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test("returns an equality comparer that returns true when the original comparer would return 0", () => {
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const comparer = CompositeComparer.create((a: number, b: number) => a - b).asEqualityComparer();
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expect(comparer(5, 5)).toEqual(true);
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expect(comparer(3, 5)).toEqual(false);
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expect(comparer(5, 3)).toEqual(false);
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});
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});
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});
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