/
matchers-toContain.property.test.ts
49 lines (46 loc) · 1.52 KB
/
matchers-toContain.property.test.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 fc from 'fast-check';
import {
anythingSettings,
assertSettings,
} from './__arbitraries__/sharedSettings';
import expect from '..';
describe('toContain', () => {
it('should always find the value when inside the array', () => {
fc.assert(
fc.property(
fc.array(fc.anything(anythingSettings)),
fc.array(fc.anything(anythingSettings)),
fc.anything(anythingSettings).filter(v => !Number.isNaN(v)),
(startValues, endValues, v) => {
// Given: startValues, endValues arrays and v value (not NaN)
expect([...startValues, v, ...endValues]).toContain(v);
},
),
assertSettings,
);
});
it('should not find the value if it has been cloned into the array', () => {
fc.assert(
fc.property(
fc.array(fc.anything(anythingSettings)),
fc.array(fc.anything(anythingSettings)),
fc.dedup(fc.anything(anythingSettings), 2),
(startValues, endValues, [a, b]) => {
// Given: startValues, endValues arrays
// and [a, b] equal, but not the same values
// with `typeof a === 'object && a !== null`
fc.pre(typeof a === 'object' && a !== null);
expect([...startValues, a, ...endValues]).not.toContain(b);
},
),
assertSettings,
);
});
});