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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.
78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
import assert from 'assert';
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import lodashStable from 'lodash';
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import { falsey, stubArray, LARGE_ARRAY_SIZE } from './utils.js';
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import tail from '../tail.js';
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describe('tail', function() {
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var array = [1, 2, 3];
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it('should accept a falsey `array`', function() {
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var expected = lodashStable.map(falsey, stubArray);
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var actual = lodashStable.map(falsey, function(array, index) {
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try {
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return index ? tail(array) : tail();
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} catch (e) {}
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});
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assert.deepStrictEqual(actual, expected);
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});
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it('should exclude the first element', function() {
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assert.deepStrictEqual(tail(array), [2, 3]);
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});
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it('should return an empty when querying empty arrays', function() {
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assert.deepStrictEqual(tail([]), []);
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});
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it('should work as an iteratee for methods like `_.map`', function() {
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var array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
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actual = lodashStable.map(array, tail);
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assert.deepStrictEqual(actual, [[2, 3], [5, 6], [8, 9]]);
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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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values = [];
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var actual = _(array).tail().filter(function(value) {
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values.push(value);
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return false;
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})
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.value();
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assert.deepEqual(actual, []);
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assert.deepEqual(values, array.slice(1));
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values = [];
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actual = _(array).filter(function(value) {
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values.push(value);
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return isEven(value);
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})
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.tail()
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.value();
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assert.deepEqual(actual, tail(_.filter(array, isEven)));
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assert.deepEqual(values, array);
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});
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it('should not execute subsequent iteratees on an empty array in a lazy sequence', function() {
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var array = lodashStable.range(LARGE_ARRAY_SIZE),
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iteratee = function() { pass = false; },
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pass = true,
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actual = _(array).slice(0, 1).tail().map(iteratee).value();
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assert.ok(pass);
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assert.deepEqual(actual, []);
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pass = true;
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actual = _(array).filter().slice(0, 1).tail().map(iteratee).value();
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assert.ok(pass);
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assert.deepEqual(actual, []);
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});
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});
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