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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.
97 lines
2.8 KiB
JavaScript
97 lines
2.8 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { slice, LARGE_ARRAY_SIZE } from './utils.js';
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import takeRightWhile from '../takeRightWhile.js';
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describe('takeRightWhile', function() {
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var array = [1, 2, 3, 4];
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var objects = [
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{ 'a': 0, 'b': 0 },
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{ 'a': 1, 'b': 1 },
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{ 'a': 2, 'b': 2 }
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];
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it('should take elements while `predicate` returns truthy', function() {
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var actual = takeRightWhile(array, function(n) {
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return n > 2;
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});
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assert.deepStrictEqual(actual, [3, 4]);
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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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takeRightWhile(array, function() {
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args = slice.call(arguments);
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});
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assert.deepStrictEqual(args, [4, 3, array]);
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});
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it('should work with `_.matches` shorthands', function() {
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assert.deepStrictEqual(takeRightWhile(objects, { 'b': 2 }), objects.slice(2));
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});
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it('should work with `_.matchesProperty` shorthands', function() {
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assert.deepStrictEqual(takeRightWhile(objects, ['b', 2]), objects.slice(2));
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});
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it('should work with `_.property` shorthands', function() {
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assert.deepStrictEqual(takeRightWhile(objects, 'b'), objects.slice(1));
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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 > 2; },
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expected = takeRightWhile(array, predicate),
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wrapped = _(array).takeRightWhile(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 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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var expected = [
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square(LARGE_ARRAY_SIZE),
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LARGE_ARRAY_SIZE - 1,
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lodashStable.map(array.slice(1), square)
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];
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_(array).slice(1).takeRightWhile(function(value, index, array) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, [LARGE_ARRAY_SIZE, LARGE_ARRAY_SIZE - 1, array.slice(1)]);
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_(array).slice(1).map(square).takeRightWhile(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).takeRightWhile(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).takeRightWhile(function(index) {
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args = slice.call(arguments);
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}).value();
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assert.deepEqual(args, [square(LARGE_ARRAY_SIZE)]);
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_(array).slice(1).map(square).takeRightWhile(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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