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