44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
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'use strict';
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var inspect = require('object-inspect');
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var forEach = require('for-each');
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module.exports = function (flatMap, t) {
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t.test('callback function', function (st) {
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forEach([[], {}, true, false, 42, 'foo', /a/g, null], function (nonFunction) {
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st['throws'](
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function () { flatMap([], nonFunction); },
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TypeError,
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inspect(nonFunction) + ' is not a function'
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);
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});
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st.end();
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});
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t.test('flatMaps', function (st) {
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var mapped = flatMap([1, [2], [3, 4]], function (x, i) {
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return [x, i];
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});
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var expected = [1, 0, [2], 1, [3, 4], 2];
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st.deepEqual(mapped, expected, 'array is flattened and mapped to tuples of item/index');
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st.equal(mapped.length, expected.length, 'array has expected length');
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var context = {};
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var actual;
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flatMap([1], function () { actual = this; }, context);
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st.equal(actual, context, 'thisArg works as expected');
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st.end();
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});
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t.test('sparse arrays', function (st) {
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var identity = function (x) { return x; };
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// eslint-disable-next-line no-sparse-arrays
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st.deepEqual(flatMap([, [1]], identity), flatMap([[], [1]], identity), 'an array hole is treated the same as an empty array');
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st.end();
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});
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};
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