mungedb-aggregate/test/lib/pipeline/expressions/VariablesParseState_test.js

"use strict";
if (!module.parent) return require.cache[__filename] = 0, (new(require("mocha"))()).addFile(__filename).ui("exports").run(process.exit);
var assert = require("assert"),
	Variables = require("../../../../lib/pipeline/expressions/Variables"),
	VariablesIdGenerator = require("../../../../lib/pipeline/expressions/VariablesIdGenerator"),
	VariablesParseState = require("../../../../lib/pipeline/expressions/VariablesParseState");

module.exports = {

	"VariablesParseState": {

		"constructor": {

			"Should be able to construct": function canConstruct() {
				var idGen = new VariablesIdGenerator();
				new VariablesParseState(idGen);
			},

			"Should throw given invalid args": function throwsForArgs() {
				assert.throws(function() {
					new VariablesParseState();
				});
				assert.throws(function() {
					new VariablesParseState(1);
				});
				assert.throws(function() {
					new VariablesParseState("hi");
				});
				assert.throws(function() {
					new VariablesParseState({});
				});
				assert.throws(function() {
					new VariablesParseState([]);
				});
				assert.throws(function() {
					new VariablesParseState(new Date());
				});
			}

		},

		"#defineVariable": {

			"Cannot define ROOT variable": function noCanRootDef() {
				var idGen = new VariablesIdGenerator(),
					vps = new VariablesParseState(idGen);
				assert.throws(function() {
					vps.defineVariable("ROOT", 5);
				});
			},

			"Should return new ids": function returnsNewIds() {
				var idGen = new VariablesIdGenerator(),
					vps = new VariablesParseState(idGen),
					firstId = vps.defineVariable("hi", "bye"),
					secondId = vps.defineVariable("bye", "hi");
				assert.notEqual(firstId, secondId);
			}

		},

		"#getVariable": {

			"Can retrieve defined variables": function getVariable() {
				var idGen = new VariablesIdGenerator(),
					vps = new VariablesParseState(idGen),
					firstId = vps.defineVariable("hi", "bye"),
					firstVariable = vps.getVariable("hi");
				assert.equal(firstVariable, firstId);
			},

			"Can retrieve root id": function getVariable() {
				var idGen = new VariablesIdGenerator(),
					vps = new VariablesParseState(idGen),
					firstVariable = vps.getVariable("ROOT");
				assert.equal(firstVariable, Variables.ROOT_ID);
			}
		}

	}

};