66 lines
2.5 KiB
JavaScript
66 lines
2.5 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var utils = require('../lib/utils');
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test('merge()', function (t) {
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t.deepEqual(utils.merge(null, true), [null, true], 'merges true into null');
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t.deepEqual(utils.merge(null, [42]), [null, 42], 'merges null into an array');
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t.deepEqual(utils.merge({ a: 'b' }, { a: 'c' }), { a: ['b', 'c'] }, 'merges two objects with the same key');
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var oneMerged = utils.merge({ foo: 'bar' }, { foo: { first: '123' } });
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t.deepEqual(oneMerged, { foo: ['bar', { first: '123' }] }, 'merges a standalone and an object into an array');
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var twoMerged = utils.merge({ foo: ['bar', { first: '123' }] }, { foo: { second: '456' } });
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t.deepEqual(twoMerged, { foo: { 0: 'bar', 1: { first: '123' }, second: '456' } }, 'merges a standalone and two objects into an array');
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var sandwiched = utils.merge({ foo: ['bar', { first: '123', second: '456' }] }, { foo: 'baz' });
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t.deepEqual(sandwiched, { foo: ['bar', { first: '123', second: '456' }, 'baz'] }, 'merges an object sandwiched by two standalones into an array');
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var nestedArrays = utils.merge({ foo: ['baz'] }, { foo: ['bar', 'xyzzy'] });
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t.deepEqual(nestedArrays, { foo: ['baz', 'bar', 'xyzzy'] });
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var noOptionsNonObjectSource = utils.merge({ foo: 'baz' }, 'bar');
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t.deepEqual(noOptionsNonObjectSource, { foo: 'baz', bar: true });
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t.test(
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'avoids invoking array setters unnecessarily',
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{ skip: typeof Object.defineProperty !== 'function' },
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function (st) {
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var setCount = 0;
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var getCount = 0;
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var observed = [];
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Object.defineProperty(observed, 0, {
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get: function () {
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getCount += 1;
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return { bar: 'baz' };
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},
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set: function () { setCount += 1; }
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});
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utils.merge(observed, [null]);
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st.equal(setCount, 0);
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st.equal(getCount, 1);
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observed[0] = observed[0]; // eslint-disable-line no-self-assign
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st.equal(setCount, 1);
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st.equal(getCount, 2);
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st.end();
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}
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);
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t.end();
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});
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test('assign()', function (t) {
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var target = { a: 1, b: 2 };
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var source = { b: 3, c: 4 };
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var result = utils.assign(target, source);
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t.equal(result, target, 'returns the target');
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t.deepEqual(target, { a: 1, b: 3, c: 4 }, 'target and source are merged');
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t.deepEqual(source, { b: 3, c: 4 }, 'source is untouched');
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t.end();
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});
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