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23 lines
546 B
23 lines
546 B
5 years ago
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export const tests = []
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const t = (f) => tests.push(f)
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// obj is declared and of type object
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t(() => obj.constructor === Object)
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// obj is constant and can not be re-assigned
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t(({ fail }) => obj && fail(() => (obj = 10)))
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// obj.str is of type string
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t(() => typeof obj.str === 'string')
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// obj.num is of type number
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t(() => typeof obj.num === 'number')
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// obj.bool is of type boolean
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t(() => typeof obj.bool === 'boolean')
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// obj.undef is of type undefined
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t(() => 'undef' in obj && typeof obj.undef === 'undefined')
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Object.freeze(tests)
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