/
toBeWithinRange.ts
51 lines (46 loc) · 1.16 KB
/
toBeWithinRange.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {expect} from '@jest/globals';
import type {MatcherFunction} from 'expect';
const toBeWithinRange: MatcherFunction<[floor: number, ceiling: number]> = (
actual: unknown,
floor: unknown,
ceiling: unknown,
) => {
if (
typeof actual !== 'number' ||
typeof floor !== 'number' ||
typeof ceiling !== 'number'
) {
throw new Error('These must be of type number!');
}
const pass = actual >= floor && actual <= ceiling;
if (pass) {
return {
message: () =>
`expected ${actual} not to be within range ${floor} - ${ceiling}`,
pass: true,
};
} else {
return {
message: () =>
`expected ${actual} to be within range ${floor} - ${ceiling}`,
pass: false,
};
}
};
expect.extend({
toBeWithinRange,
});
declare module 'expect' {
interface AsymmetricMatchers {
toBeWithinRange(a: number, b: number): void;
}
interface Matchers<R> {
toBeWithinRange(a: number, b: number): R;
}
}