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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.
103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { slice, LARGE_ARRAY_SIZE, square } from './utils.js';
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import takeWhile from '../takeWhile.js';
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describe('takeWhile', function() {
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var array = [1, 2, 3, 4];
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var objects = [
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{ 'a': 2, 'b': 2 },
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{ 'a': 1, 'b': 1 },
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{ 'a': 0, 'b': 0 }
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];
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it('should take elements while `predicate` returns truthy', function() {
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var actual = takeWhile(array, function(n) {
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return n < 3;
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});
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assert.deepStrictEqual(actual, [1, 2]);
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});
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it('should provide correct `predicate` arguments', function() {
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var args;
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takeWhile(array, function() {
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args = slice.call(arguments);
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});
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assert.deepStrictEqual(args, [1, 0, array]);
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});
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it('should work with `_.matches` shorthands', function() {
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assert.deepStrictEqual(takeWhile(objects, { 'b': 2 }), objects.slice(0, 1));
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});
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it('should work with `_.matchesProperty` shorthands', function() {
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assert.deepStrictEqual(takeWhile(objects, ['b', 2]), objects.slice(0, 1));
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});
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it('should work with `_.property` shorthands', function() {
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assert.deepStrictEqual(takeWhile(objects, 'b'), objects.slice(0, 2));
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});
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it('should work in a lazy sequence', function() {
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var array = lodashStable.range(LARGE_ARRAY_SIZE),
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predicate = function(n) { return n < 3; },
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expected = takeWhile(array, predicate),
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wrapped = _(array).takeWhile(predicate);
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assert.deepEqual(wrapped.value(), expected);
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assert.deepEqual(wrapped.reverse().value(), expected.slice().reverse());
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assert.strictEqual(wrapped.last(), _.last(expected));
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});
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it('should work in a lazy sequence with `take`', function() {
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var array = lodashStable.range(LARGE_ARRAY_SIZE);
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var actual = _(array)
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.takeWhile(function(n) { return n < 4; })
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.take(2)
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.takeWhile(function(n) { return n == 0; })
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.value();
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assert.deepEqual(actual, [0]);
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});
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it('should provide correct `predicate` arguments in a lazy sequence', function() {
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var args,
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array = lodashStable.range(LARGE_ARRAY_SIZE + 1),
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expected = [1, 0, lodashStable.map(array.slice(1), square)];
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_(array).slice(1).takeWhile(function(value, index, array) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, [1, 0, array.slice(1)]);
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_(array).slice(1).map(square).takeWhile(function(value, index, array) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, expected);
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_(array).slice(1).map(square).takeWhile(function(value, index) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, expected);
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_(array).slice(1).map(square).takeWhile(function(value) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, [1]);
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_(array).slice(1).map(square).takeWhile(function() {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, expected);
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});
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});
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