Adding tests and support for comparing arrow functions.

index.js

@@ -4,6 +4,7 @@ var ObjectPrototype = Object.prototype;
 var toString = ObjectPrototype.toString;
 var has = ObjectPrototype.hasOwnProperty;
 var isGenerator = require('is-generator-function');
+var isArrowFunction = require('is-arrow-function');
 
 var getPrototypeOf = Object.getPrototypeOf;
 if (!getPrototypeOf) {
@@ -74,6 +75,10 @@ module.exports = function isEqual(value, other) {
 		var otherIsGen = isGenerator(other);
 		if (valueIsGen !== otherIsGen) { return false; }
 
+		var valueIsArrow = isArrowFunction(value);
+		var otherIsArrow = isArrowFunction(other);
+		if (valueIsArrow !== otherIsArrow) { return false; }
+
 		return isEqual(String(value), String(other));
 	}
 

package.json

@@ -27,13 +27,15 @@
 		"equality"
 	],
 	"dependencies": {
+		"is-arrow-function": "~2.0.0",
 		"is-generator-function": "~1.0.0"
 	},
 	"devDependencies": {
 		"tape": "~3.0.3",
 		"covert": "1.0.0",
 		"jscs": "~1.8.1",
 		"foreach": "~2.0.5",
+		"make-arrow-function": "~1.0.0",
 		"make-generator-function": "~1.0.0"
 	},
 	"testling": {

test.js

@@ -3,6 +3,8 @@
 var test = require('tape');
 var isEqual = require('./');
 var hasGeneratorSupport = typeof require('make-generator-function') === 'function';
+var arrowFunctions = require('make-arrow-function').list();
+var hasArrowFunctionSupport = arrowFunctions.length > 0;
 
 var forEach = require('foreach');
 var copyFunction = function (fn) {
@@ -161,6 +163,15 @@ test('functions', function (t) {
 		st.end();
 	});
 
+	t.test('arrow functions', { skip: !hasArrowFunctionSupport }, function (st) {
+		forEach(arrowFunctions, function (fn) {
+			st.notOk(isEqual(fnNoSpace, fn), fn + ' not equal to ' + fnNoSpace);
+			st.ok(isEqual(fn, fn), fn + ' equal to itself');
+			st.ok(isEqual(fn, copyFunction(fn)), fn + ' equal to copyFunction(fn)');
+		});
+		st.end();
+	});
+
 	t.end();
 });