69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var getProto = require('../');
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test('getProto', function (t) {
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t.equal(typeof getProto, 'function', 'is a function');
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t.test('can get', { skip: !getProto }, function (st) {
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if (getProto) { // TS doesn't understand tape's skip
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var proto = { b: 2 };
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st.equal(getProto(proto), Object.prototype, 'proto: returns the [[Prototype]]');
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st.test('nullish value', function (s2t) {
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// @ts-expect-error
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s2t['throws'](function () { return getProto(undefined); }, TypeError, 'undefined is not an object');
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// @ts-expect-error
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s2t['throws'](function () { return getProto(null); }, TypeError, 'null is not an object');
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s2t.end();
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});
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// @ts-expect-error
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st['throws'](function () { getProto(true); }, 'throws for true');
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// @ts-expect-error
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st['throws'](function () { getProto(false); }, 'throws for false');
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// @ts-expect-error
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st['throws'](function () { getProto(42); }, 'throws for 42');
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// @ts-expect-error
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st['throws'](function () { getProto(NaN); }, 'throws for NaN');
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// @ts-expect-error
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st['throws'](function () { getProto(0); }, 'throws for +0');
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// @ts-expect-error
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st['throws'](function () { getProto(-0); }, 'throws for -0');
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// @ts-expect-error
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st['throws'](function () { getProto(Infinity); }, 'throws for ∞');
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// @ts-expect-error
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st['throws'](function () { getProto(-Infinity); }, 'throws for -∞');
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// @ts-expect-error
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st['throws'](function () { getProto(''); }, 'throws for empty string');
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// @ts-expect-error
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st['throws'](function () { getProto('foo'); }, 'throws for non-empty string');
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st.equal(getProto(/a/g), RegExp.prototype);
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st.equal(getProto(new Date()), Date.prototype);
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st.equal(getProto(function () {}), Function.prototype);
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st.equal(getProto([]), Array.prototype);
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st.equal(getProto({}), Object.prototype);
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var nullObject = { __proto__: null };
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if ('toString' in nullObject) {
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st.comment('no null objects in this engine');
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st.equal(getProto(nullObject), Object.prototype, '"null" object has Object.prototype as [[Prototype]]');
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} else {
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st.equal(getProto(nullObject), null, 'null object has null [[Prototype]]');
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}
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}
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st.end();
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});
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t.test('can not get', { skip: !!getProto }, function (st) {
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st.equal(getProto, null);
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st.end();
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});
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t.end();
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});
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