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40 lines
1.2 KiB
40 lines
1.2 KiB
'use strict';
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module.exports = function (numberIsNaN, t) {
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t.test('not NaN', function (st) {
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st.test('primitives', function (sst) {
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sst.notOk(numberIsNaN(), 'undefined is not NaN');
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sst.notOk(numberIsNaN(null), 'null is not NaN');
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sst.notOk(numberIsNaN(false), 'false is not NaN');
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sst.notOk(numberIsNaN(true), 'true is not NaN');
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sst.notOk(numberIsNaN(0), 'positive zero is not NaN');
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sst.notOk(numberIsNaN(Infinity), 'Infinity is not NaN');
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sst.notOk(numberIsNaN(-Infinity), '-Infinity is not NaN');
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sst.notOk(numberIsNaN('foo'), 'string is not NaN');
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sst.notOk(numberIsNaN('NaN'), 'string NaN is not NaN');
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sst.end();
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});
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st.notOk(numberIsNaN([]), 'array is not NaN');
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st.notOk(numberIsNaN({}), 'object is not NaN');
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st.notOk(numberIsNaN(function () {}), 'function is not NaN');
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st.test('valueOf', function (vt) {
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var obj = {
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valueOf: function () {
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return NaN;
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}
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};
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vt.ok(numberIsNaN(Number(obj)), 'object with valueOf of NaN, converted to Number, is NaN');
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vt.notOk(numberIsNaN(obj), 'object with valueOf of NaN is not NaN');
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vt.end();
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});
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st.end();
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});
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t.test('NaN literal', function (st) {
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st.ok(numberIsNaN(NaN), 'NaN is NaN');
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st.end();
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});
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};
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