| 1 | 'use strict';
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| 2 |
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| 3 | var all = require('../src/all'),
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| 4 | assert = require('chai').assert;
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| 5 |
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| 6 | describe('all', function() {
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| 7 | var TRUE_PREDICATE = function() {
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| 8 | return true;
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| 9 | },
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| 10 | FALSE_PREDICATE = function() {
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| 11 | return false;
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| 12 | };
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| 13 |
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| 14 | it('returns a function', function() {
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| 15 | assert.ok(all(TRUE_PREDICATE, FALSE_PREDICATE) instanceof Function);
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| 16 | });
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| 17 |
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| 18 | it('throws error if not every predicate is a function', function() {
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| 19 | assert.throws(function() {
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| 20 | all(TRUE_PREDICATE, 'definitely not a function');
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| 21 | });
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| 22 | });
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| 23 |
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| 24 | it('throws error if zero or only one predicate provided', function() {
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| 25 | assert.throws(function() {
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| 26 | all();
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| 27 | }, Error, 'need to provide at least two predicates');
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| 28 |
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| 29 | assert.throws(function() {
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| 30 | all(TRUE_PREDICATE);
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| 31 | }, Error, 'need to provide at least two predicates');
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| 32 |
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| 33 | assert.doesNotThrow(function() {
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| 34 | all(TRUE_PREDICATE, FALSE_PREDICATE);
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| 35 | });
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| 36 | });
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| 37 |
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| 38 | it('calls predicates in order', function() {
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| 39 | var counter = 0;
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| 40 | all(function() {
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| 41 | assert.strictEqual(counter, 0);
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| 42 | counter++;
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| 43 | return true;
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| 44 | }, function() {
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| 45 | assert.strictEqual(counter, 1);
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| 46 | counter++;
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| 47 | return true;
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| 48 | }, function() {
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| 49 | assert.strictEqual(counter, 2);
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| 50 | counter++;
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| 51 | return true;
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| 52 | })('value');
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| 53 | assert.strictEqual(counter, 3, 'Not all predicates have been called');
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| 54 | });
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| 55 |
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| 56 | it('calls predicates with correct context and arguments', function() {
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| 57 | var args = [1, 2, 3, 4],
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| 58 | context = {example: 'context'},
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| 59 | predicate = function(arg1, arg2, arg3, arg4, arg5) {
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| 60 | assert.strictEqual(context, this);
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| 61 | assert.strictEqual(arg1, 1);
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| 62 | assert.strictEqual(arg2, 2);
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| 63 | assert.strictEqual(arg3, 3);
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| 64 | assert.strictEqual(arg4, 4);
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| 65 | assert.strictEqual(arg5, undefined);
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| 66 | return false;
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| 67 | },
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| 68 | testPredicate = all(predicate, predicate, predicate, predicate);
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| 69 |
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| 70 | assert.ok(!testPredicate.apply(context, args));
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| 71 | });
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| 72 |
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| 73 | it('checks whether all predicates are satisfied', function() {
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| 74 | assert.ok(all(TRUE_PREDICATE, TRUE_PREDICATE, TRUE_PREDICATE)('value'));
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| 75 | assert.ok(all(TRUE_PREDICATE, FALSE_PREDICATE)('value') === false);
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| 76 | });
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| 77 |
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| 78 | it('does not call all predicates if one of them has not been satisfied earlier', function() {
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| 79 | assert.ok(all(FALSE_PREDICATE, function() {
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| 80 | throw new Error('Last predicate should not be called');
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| 81 | })('value') === false);
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| 82 | });
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| 83 | });
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