| 1 | var RuleEngine = require('../index');
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| 2 | var expect = require("chai").expect;
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| 3 | describe("Rules", function() {
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| 4 | describe(".init()", function() {
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| 5 | it("should empty the existing rule array", function() {
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| 6 | var rules = [{
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| 7 | "condition": function(R) {
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| 8 | R.when(1);
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| 9 | },
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| 10 | "consequence": function(R) {
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| 11 | R.stop();
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| 12 | }
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| 13 | }];
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| 14 | var R = new RuleEngine(rules);
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| 15 | R.init();
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| 16 | expect(R.rules).to.eql([]);
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| 17 | });
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| 18 | });
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| 19 | describe(".register()", function() {
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| 20 | it("Rule should be turned on if the field - ON is absent in the rule", function() {
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| 21 | var rules = [{
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| 22 | "condition": function(R) {
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| 23 | R.when(1);
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| 24 | },
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| 25 | "consequence": function(R) {
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| 26 | R.stop();
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| 27 | }
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| 28 | }];
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| 29 | var R = new RuleEngine(rules);
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| 30 | expect(R.rules[0].on).to.eql(true);
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| 31 | });
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| 32 | it("Rule can be passed to register as both arrays and individual objects", function() {
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| 33 | var rule = {
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| 34 | "condition": function(R) {
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| 35 | R.when(1);
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| 36 | },
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| 37 | "consequence": function(R) {
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| 38 | R.stop();
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| 39 | }
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| 40 | };
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| 41 | var R1 = new RuleEngine(rule);
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| 42 | var R2 = new RuleEngine([rule]);
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| 43 | expect(R1.rules).to.eql(R2.rules);
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| 44 | });
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| 45 | it("Rules can be appended multiple times via register after creating rule engine instance", function() {
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| 46 | var rules = [{
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| 47 | "condition": function(R) {
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| 48 | R.when(1);
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| 49 | },
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| 50 | "consequence": function(R) {
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| 51 | R.stop();
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| 52 | }
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| 53 | }, {
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| 54 | "condition": function(R) {
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| 55 | R.when(0);
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| 56 | },
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| 57 | "consequence": function(R) {
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| 58 | R.stop();
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| 59 | }
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| 60 | }];
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| 61 | var R1 = new RuleEngine(rules);
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| 62 | var R2 = new RuleEngine(rules[0]);
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| 63 | R2.register(rules[1]);
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| 64 | expect(R1.rules).to.eql(R2.rules);
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| 65 | });
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| 66 | });
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| 67 | describe(".sync()", function() {
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| 68 | it("should only push active rules into active rules array", function() {
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| 69 | var rules = [{
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| 70 | "condition": function(R) {
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| 71 | R.when(1);
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| 72 | },
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| 73 | "consequence": function(R) {
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| 74 | R.stop();
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| 75 | },
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| 76 | "id": "one",
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| 77 | "on": true
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| 78 | }, {
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| 79 | "condition": function(R) {
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| 80 | R.when(0);
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| 81 | },
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| 82 | "consequence": function(R) {
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| 83 | R.stop();
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| 84 | },
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| 85 | "id": "one",
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| 86 | "on": false
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| 87 | }];
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| 88 | var R = new RuleEngine();
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| 89 | R.register(rules);
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| 90 | expect(R.activeRules).not.to.eql(R.rules);
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| 91 | });
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| 92 | it("should sort the rules accroding to priority, if priority is present", function() {
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| 93 | var rules = [{
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| 94 | "priority": 8,
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| 95 | "index": 1,
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| 96 | "condition": function(R) {
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| 97 | R.when(1);
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| 98 | },
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| 99 | "consequence": function(R) {
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| 100 | R.stop();
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| 101 | },
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| 102 | }, {
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| 103 | "priority": 6,
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| 104 | "index": 2,
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| 105 | "condition": function(R) {
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| 106 | R.when(1);
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| 107 | },
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| 108 | "consequence": function(R) {
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| 109 | R.stop();
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| 110 | },
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| 111 | }, {
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| 112 | "priority": 9,
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| 113 | "index": 0,
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| 114 | "condition": function(R) {
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| 115 | R.when(1);
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| 116 | },
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| 117 | "consequence": function(R) {
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| 118 | R.stop();
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| 119 | },
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| 120 | }];
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| 121 | var R = new RuleEngine();
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| 122 | R.register(rules);
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| 123 | expect(R.activeRules[2].index).to.eql(2);
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| 124 | });
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| 125 | });
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| 126 | describe(".exec()", function() {
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| 127 | it("should run consequnce when condition matches", function() {
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| 128 | var rule = {
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| 129 | "condition": function(R) {
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| 130 | R.when(this && (this.transactionTotal < 500));
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| 131 | },
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| 132 | "consequence": function(R) {
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| 133 | this.result = false;
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| 134 | R.stop();
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| 135 | }
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| 136 | };
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| 137 | var R = new RuleEngine(rule);
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| 138 | R.execute({
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| 139 | "transactionTotal": 200
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| 140 | }, function(result) {
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| 141 | expect(result.result).to.eql(false);
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| 142 | });
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| 143 | });
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| 144 | it("should chain rules and find result with next()", function() {
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| 145 | var rule = [{
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| 146 | "condition": function(R) {
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| 147 | R.when(this && (this.card == "VISA"));
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| 148 | },
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| 149 | "consequence": function(R) {
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| 150 | R.stop();
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| 151 | this.result = "Custom Result";
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| 152 | },
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| 153 | "priority": 4
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| 154 | }, {
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| 155 | "condition": function(R) {
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| 156 | R.when(this && (this.transactionTotal < 1000));
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| 157 | },
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| 158 | "consequence": function(R) {
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| 159 | R.next();
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| 160 | },
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| 161 | "priority": 8
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| 162 | }];
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| 163 | var R = new RuleEngine(rule);
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| 164 | R.execute({
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| 165 | "transactionTotal": 200,
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| 166 | "card": "VISA"
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| 167 | }, function(result) {
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| 168 | expect(result.result).to.eql("Custom Result");
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| 169 | });
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| 170 | });
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| 171 | it("should provide access to rule definition properties via rule()", function() {
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| 172 | var rule = {
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| 173 | "name": "sample rule name",
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| 174 | "id": "xyzzy",
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| 175 | "condition": function(R) {
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| 176 | R.when(this && (this.input === true));
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| 177 | },
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| 178 | "consequence": function(R) {
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| 179 | this.result = true;
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| 180 | this.ruleName = R.rule().name;
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| 181 | this.ruleID = R.rule().id;
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| 182 | R.stop();
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| 183 | }
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| 184 | };
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| 185 | var R = new RuleEngine(rule);
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| 186 | R.execute({
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| 187 | "input": true
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| 188 | }, function(result) {
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| 189 | expect(result.ruleName).to.eql(rule.name);
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| 190 | expect(result.ruleID).to.eql(rule.id);
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| 191 | });
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| 192 | });
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| 193 | it("should include the matched rule path", function() {
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| 194 | var rules = [
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| 195 | {
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| 196 | "name": "rule A",
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| 197 | "condition": function(R) {
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| 198 | R.when(this && (this.x === true));
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| 199 | },
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| 200 | "consequence": function(R) {
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| 201 | R.next();
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| 202 | }
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| 203 | },
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| 204 | {
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| 205 | "name": "rule B",
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| 206 | "condition": function(R) {
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| 207 | R.when(this && (this.y === true));
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| 208 | },
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| 209 | "consequence": function(R) {
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| 210 | R.next();
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| 211 | }
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| 212 | },
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| 213 | {
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| 214 | "id": "rule C",
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| 215 | "condition": function(R) {
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| 216 | R.when(this && (this.x === true && this.y === false));
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| 217 | },
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| 218 | "consequence": function(R) {
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| 219 | R.next();
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| 220 | }
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| 221 | },
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| 222 | {
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| 223 | "id": "rule D",
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| 224 | "condition": function(R) {
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| 225 | R.when(this && (this.x === false && this.y === false));
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| 226 | },
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| 227 | "consequence": function(R) {
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| 228 | R.next();
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| 229 | }
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| 230 | },
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| 231 | {
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| 232 | "condition": function(R) {
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| 233 | R.when(this && (this.x === true && this.y === false));
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| 234 | },
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| 235 | "consequence": function(R) {
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| 236 | R.next();
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| 237 | }
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| 238 | }
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| 239 | ];
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| 240 | var lastMatch = 'index_' + ((rules.length)-1).toString();
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| 241 | var R = new RuleEngine(rules);
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| 242 | R.execute({
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| 243 | "x": true,
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| 244 | "y": false
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| 245 | }, function(result) {
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| 246 | expect(result.matchPath).to.eql([rules[0].name, rules[2].id, lastMatch]);
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| 247 | });
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| 248 | });
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| 249 |
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| 250 | it("should support fact as optional second parameter for es6 compatibility", function() {
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| 251 | var rule = {
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| 252 | "condition": function(R, fact) {
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| 253 | R.when(fact && (fact.transactionTotal < 500));
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| 254 | },
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| 255 | "consequence": function(R, fact) {
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| 256 | fact.result = false;
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| 257 | R.stop();
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| 258 | }
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| 259 | };
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| 260 | var R = new RuleEngine(rule);
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| 261 | R.execute({
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| 262 | "transactionTotal": 200
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| 263 | }, function(result) {
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| 264 | expect(result.result).to.eql(false);
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| 265 | });
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| 266 | });
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| 267 |
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| 268 | });
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| 269 | describe(".findRules()", function() {
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| 270 | var rules = [{
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| 271 | "condition": function(R) {
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| 272 | R.when(1);
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| 273 | },
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| 274 | "consequence": function(R) {
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| 275 | R.stop();
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| 276 | },
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| 277 | "id": "one"
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| 278 | }, {
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| 279 | "condition": function(R) {
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| 280 | R.when(0);
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| 281 | },
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| 282 | "consequence": function(R) {
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| 283 | R.stop();
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| 284 | },
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| 285 | "id": "two"
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| 286 | }];
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| 287 | var R = new RuleEngine(rules);
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| 288 | it("find selector function for rules should exact number of matches", function() {
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| 289 | expect(R.findRules({
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| 290 | "id": "one"
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| 291 | }).length).to.eql(1);
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| 292 | });
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| 293 | it("find selector function for rules should give the correct match as result", function() {
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| 294 | expect(R.findRules({
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| 295 | "id": "one"
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| 296 | })[0].id).to.eql("one");
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| 297 | });
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| 298 | it("find without condition works fine", function() {
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| 299 | expect(R.findRules().length).to.eql(2);
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| 300 | });
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| 301 | });
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| 302 | describe(".turn()", function() {
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| 303 | var rules = [{
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| 304 | "condition": function(R) {
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| 305 | R.when(1);
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| 306 | },
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| 307 | "consequence": function(R) {
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| 308 | R.stop();
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| 309 | },
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| 310 | "id": "one"
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| 311 | }, {
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| 312 | "condition": function(R) {
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| 313 | R.when(0);
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| 314 | },
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| 315 | "consequence": function(R) {
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| 316 | R.stop();
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| 317 | },
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| 318 | "id": "two",
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| 319 | "on": false
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| 320 | }];
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| 321 | var R = new RuleEngine(rules);
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| 322 | it("checking whether turn off rules work as expected", function() {
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| 323 | R.turn("OFF", {
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| 324 | "id": "one"
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| 325 | });
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| 326 | expect(R.findRules({
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| 327 | "id": "one"
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| 328 | })[0].on).to.eql(false);
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| 329 | });
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| 330 | it("checking whether turn on rules work as expected", function() {
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| 331 | R.turn("ON", {
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| 332 | "id": "two"
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| 333 | });
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| 334 | expect(R.findRules({
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| 335 | "id": "two"
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| 336 | })[0].on).to.eql(true);
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| 337 | });
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| 338 | });
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| 339 | describe(".prioritize()", function() {
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| 340 | var rules = [{
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| 341 | "condition": function(R) {
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| 342 | R.when(1);
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| 343 | },
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| 344 | "consequence": function(R) {
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| 345 | R.stop();
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| 346 | },
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| 347 | "id": "two",
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| 348 | "priority": 1
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| 349 | }, {
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| 350 | "condition": function(R) {
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| 351 | R.when(0);
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| 352 | },
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| 353 | "consequence": function(R) {
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| 354 | R.stop();
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| 355 | },
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| 356 | "id": "zero",
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| 357 | "priority": 8
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| 358 | }, {
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| 359 | "condition": function(R) {
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| 360 | R.when(0);
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| 361 | },
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| 362 | "consequence": function(R) {
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| 363 | R.stop();
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| 364 | },
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| 365 | "id": "one",
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| 366 | "priority": 4
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| 367 | }];
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| 368 | var R = new RuleEngine(rules);
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| 369 | it("checking whether prioritize work", function() {
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| 370 | R.prioritize(10, {
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| 371 | "id": "one"
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| 372 | });
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| 373 | expect(R.findRules({
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| 374 | "id": "one"
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| 375 | })[0].priority).to.eql(10);
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| 376 | });
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| 377 | it("checking whether rules reorder after prioritize", function() {
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| 378 | R.prioritize(10, {
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| 379 | "id": "one"
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| 380 | });
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| 381 | expect(R.activeRules[0].id).to.eql("one");
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| 382 | });
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| 383 | });
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| 384 | describe("ignoreFactChanges", function() {
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| 385 | var rules = [{
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| 386 | "name": "rule1",
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| 387 | "condition": function(R) {
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| 388 | R.when(this.value1 > 5);
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| 389 | },
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| 390 | "consequence": function(R) {
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| 391 | this.result = false;
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| 392 | this.errors = this.errors || [];
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| 393 | this.errors.push('must be less than 5');
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| 394 | R.next();
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| 395 | }
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| 396 | }];
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| 397 |
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| 398 | var fact = {
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| 399 | "value1": 6
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| 400 | };
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| 401 |
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| 402 | it("doesn't rerun when a fact changes if ignoreFactChanges is true", function(done) {
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| 403 | var R = new RuleEngine(rules, { ignoreFactChanges: true });
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| 404 |
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| 405 | R.execute(fact, function(result) {
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| 406 | expect(result.errors).to.have.length(1);
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| 407 | done();
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| 408 | });
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| 409 | });
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| 410 | });
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| 411 | });
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