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* Install test dependencies. * Add initial test files. These files were created using a simplistic AST manipulator using `recast` to preserve formatting. There's bound to be a huge chunk of errors, but this serves as a good start. QUnit was replaced with Mocha, with ES2015 imports running via `esm`. As far as possible, QUnit-specific syntax has been replaced with Mocha's `describe` and `it`, while the native Node.js `assert` module is used for assertions. Files in the `test` directory ending in `.test.js` will be treated as test files. * Add initial passing files to test run.
92 lines
3.5 KiB
JavaScript
92 lines
3.5 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { _, args, LARGE_ARRAY_SIZE, stubNaN } from './utils.js';
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describe('intersection methods', function() {
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lodashStable.each(['intersection', 'intersectionBy', 'intersectionWith'], function(methodName) {
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var func = _[methodName];
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it('`_.' + methodName + '` should return the intersection of two arrays', function() {
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var actual = func([2, 1], [2, 3]);
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assert.deepStrictEqual(actual, [2]);
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});
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it('`_.' + methodName + '` should return the intersection of multiple arrays', function() {
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var actual = func([2, 1, 2, 3], [3, 4], [3, 2]);
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assert.deepStrictEqual(actual, [3]);
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});
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it('`_.' + methodName + '` should return an array of unique values', function() {
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var actual = func([1, 1, 3, 2, 2], [5, 2, 2, 1, 4], [2, 1, 1]);
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assert.deepStrictEqual(actual, [1, 2]);
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});
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it('`_.' + methodName + '` should work with a single array', function() {
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var actual = func([1, 1, 3, 2, 2]);
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assert.deepStrictEqual(actual, [1, 3, 2]);
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});
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it('`_.' + methodName + '` should work with `arguments` objects', function() {
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var array = [0, 1, null, 3],
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expected = [1, 3];
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assert.deepStrictEqual(func(array, args), expected);
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assert.deepStrictEqual(func(args, array), expected);
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});
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it('`_.' + methodName + '` should treat `-0` as `0`', function() {
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var values = [-0, 0],
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expected = lodashStable.map(values, lodashStable.constant(['0']));
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var actual = lodashStable.map(values, function(value) {
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return lodashStable.map(func(values, [value]), lodashStable.toString);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('`_.' + methodName + '` should match `NaN`', function() {
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var actual = func([1, NaN, 3], [NaN, 5, NaN]);
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assert.deepStrictEqual(actual, [NaN]);
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});
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it('`_.' + methodName + '` should work with large arrays of `-0` as `0`', function() {
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var values = [-0, 0],
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expected = lodashStable.map(values, lodashStable.constant(['0']));
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var actual = lodashStable.map(values, function(value) {
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var largeArray = lodashStable.times(LARGE_ARRAY_SIZE, lodashStable.constant(value));
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return lodashStable.map(func(values, largeArray), lodashStable.toString);
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('`_.' + methodName + '` should work with large arrays of `NaN`', function() {
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var largeArray = lodashStable.times(LARGE_ARRAY_SIZE, stubNaN);
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assert.deepStrictEqual(func([1, NaN, 3], largeArray), [NaN]);
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});
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it('`_.' + methodName + '` should work with large arrays of objects', function() {
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var object = {},
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largeArray = lodashStable.times(LARGE_ARRAY_SIZE, lodashStable.constant(object));
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assert.deepStrictEqual(func([object], largeArray), [object]);
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assert.deepStrictEqual(func(lodashStable.range(LARGE_ARRAY_SIZE), [1]), [1]);
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});
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it('`_.' + methodName + '` should treat values that are not arrays or `arguments` objects as empty', function() {
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var array = [0, 1, null, 3];
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assert.deepStrictEqual(func(array, 3, { '0': 1 }, null), []);
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assert.deepStrictEqual(func(null, array, null, [2, 3]), []);
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assert.deepStrictEqual(func(array, null, args, null), []);
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});
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it('`_.' + methodName + '` should return a wrapped value when chaining', function() {
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var wrapped = _([1, 3, 2])[methodName]([5, 2, 1, 4]);
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assert.ok(wrapped instanceof _);
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assert.deepEqual(wrapped.value(), [1, 2]);
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});
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});
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});
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