node-query/test/helpers_test.js

'use strict';

let chai = require('chai'),
	assert = chai.assert,
	expect = chai.expect,
	should = chai.should();

let helpers = require('../lib/helpers');

suite('Helper Module Tests', () => {
	suite('Type-checking methods', () => {
		suite('Object wrappers are listed as their native type', () => {
			test("Boolean Wrapper returns 'boolean' not 'object'", () => {
				let item = Boolean(true);
				expect(helpers.type(item)).to.deep.equal('boolean');
			});
			test("Number Wrapper returns 'number' not 'object", () => {
				let item = Number(4867);
				expect(helpers.type(item)).to.deep.equal('number');
			});
			test("String Wrapper returns 'string' not 'object'", () => {
				let item = String("Foo");
				expect(helpers.type(item)).to.deep.equal('string');
			});
		});
		suite('is..Method methods exist', () => {
			let types = ['Null','Undefined','Object','Array','String','Number','Boolean','Function','RegExp','NaN','Infinite'];

			types.forEach(type => {
				test(`is${type} method exists`, () => {
					assert.ok(helpers[`is${type}`]);
				});
			});
		});
		suite('isScalar', () => {
			let trueCases = {
				'Strings are scalar': 'foo',
				'Booleans are scalar': true,
				'Numbers are scalar': 545
			};
			Object.keys(trueCases).forEach(desc => {
				test(desc, () => {
					expect(helpers.isScalar(trueCases[desc])).to.be.true;
				});
			});

			let falseCases = {
				'Arrays are not scalar': [],
				'Objects are not scalar': [],
			};
			Object.keys(falseCases).forEach(desc => {
				test(desc, () => {
					expect(helpers.isScalar(falseCases[desc])).to.be.false;
				});
			});
		});
		suite('isInfinity', () => {
			test('The type of 1/0 is infinity', () => {
				expect(helpers.type(1/0)).to.equal('infinity');
			});
			test('isInfinity is the same as isInfinite', () => {
				expect(helpers.isInfinite(1/0)).to.be.true;
			});
		});
		suite('isNaN', () => {
			test('The type of 0 / 0 is NaN', () => {
				expect(helpers.type(0 / 0)).to.equal('nan');
			});
			test('isNaN method agrees with type', () => {
				expect(helpers.isNaN(0 / 0)).to.be.true;
			});
		});
	});
	suite('Other helper methods', () => {
		suite('stringTrim', () => {
			test('stringTrim method works as expected', () => {
				let orig = ['  x y ', 'z   ', ' q'];
				let ret = ['x y', 'z', 'q'];

				expect(orig.map(helpers.stringTrim)).to.be.deep.equal(ret);
			});
		});
		suite('arrayPluck', () => {
			let orig = [{
				foo: 1
			},{
				foo: 2,
				bar: 10
			},{
				foo: 3,
				bar: 15
			}];

			test('Finding members in all objects', () => {
				expect(helpers.arrayPluck(orig, 'foo')).to.be.deep.equal([1,2,3]);
			});
			test('Some members are missing in some objects', () => {
				expect(helpers.arrayPluck(orig, 'bar')).to.be.deep.equal([10, 15]);
			});
			test('Empty case', () => {
				expect(helpers.arrayPluck([], 'apple')).to.be.deep.equal([]);
			});
		});
		suite('regexInArray', () => {
			let orig = ['apple', ' string ', 6, 4, 7];

			let cases = [{
				'Dollar sign is not in any of the array items': /\$/,
				'None of the numbers in the array match /5/': /5/
			},{
				"' string ' matches /^ ?string/": /^ ?string/,
				"'apple' matches /APPLE/i": /APPLE/i
			}];

			[0, 1].forEach(i => {
				let boolCase = cases[i];
				Object.keys(boolCase).forEach(desc => {
					test(desc, () => {
						if (i) {
							expect(helpers.regexInArray(orig, boolCase[desc])).to.be.true;
						} else {
							expect(helpers.regexInArray(orig, boolCase[desc])).to.be.false;
						}
					});
				});
			});

			test('First argument is not an array', () => {
				expect(helpers.regexInArray(5, /5/)).to.be.false;
			});
			test('Array is empty', () => {
				expect(helpers.regexInArray([], /.*/)).to.be.false;
			});
		});
	});
});