44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
import { expect, it } from "./deps.testing.ts";
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import { always, and, never, not, or } from "./predicates.ts";
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it("always", () => {
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expect(always()).toBe(true);
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expect(always(true)).toBe(true);
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expect(always(false)).toBe(true);
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});
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it("never", () => {
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expect(never()).toBe(false);
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expect(never(true)).toBe(false);
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expect(never(false)).toBe(false);
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});
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it("not", () => {
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const iseven = (x: number) => x % 2 == 0;
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const isodd = not(iseven);
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expect(iseven(0)).toBe(true);
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expect(isodd(0)).toBe(false);
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expect(iseven(1)).toBe(false);
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expect(isodd(1)).toBe(true);
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expect(iseven(2)).toBe(true);
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expect(isodd(2)).toBe(false);
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});
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it("and", () => {
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const f = and((x: number) => x % 2 == 0, (x: number) => x > 5);
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expect(f(0)).toBe(false);
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expect(f(2)).toBe(false);
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expect(f(8)).toBe(true);
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expect(f(9)).toBe(false);
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expect(f(10)).toBe(true);
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});
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it("or", () => {
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const f = or((x: number) => x % 2 == 0, (x: number) => x > 5);
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expect(f(0)).toBe(true);
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expect(f(1)).toBe(false);
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expect(f(2)).toBe(true);
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expect(f(8)).toBe(true);
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expect(f(9)).toBe(true);
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});
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