Fixed math processor and added tests

Math/MathProcessor.js

@@ -28,12 +28,14 @@
             }
         }
 
-        return stack.pop();
+        const result = stack.pop();
+
+        return !isNaN(parseFloat(result)) && isFinite(result) ? result : null;
     };
 
     jsOMS.parseValue = function(value)
     {
-        return value.indexOf('.') === -1 ? parseInt(value) : parseFloat(value);
+        return typeof value === 'string' ? (value.indexOf('.') === -1 ? parseInt(value) : parseFloat(value)) : value;
     }
 
     jsOMS.shuntingYard = function(equation)
@@ -41,8 +43,8 @@
         const stack     = [];
         const operators = {
             '^': {precedence: 4, order: 1},
-            '/': {precedence: 3, order: -1},
             '*': {precedence: 3, order: -1},
+            '/': {precedence: 3, order: -1},
             '+': {precedence: 2, order: -1},
             '-': {precedence: 2, order: -1},
         };
@@ -51,9 +53,11 @@
         equation = equation.replace(/\s+/g, '');
         equation = equation.split(/([\+\-\*\/\^\(\)])/).filter(function (n) { return n !== '' });
 
-        let length = equation.length;
+        const length = equation.length;
+        let token;
+
         for (let i = 0; i < length; ++i) {
-            let token = equation[i];
+            token = equation[i];
 
             if (!isNaN(parseFloat(token)) && isFinite(token)) {
                 output.push(token);

tests/Math/MathProcessorTest.js

@@ -2,11 +2,12 @@ describe('MathProcessorTest', function ()
 {
     "use strict";
 
-    beforeEach(function ()
+    describe('testEvaluation', function ()
     {
+        it('Testing formula evaluation', function ()
+        {
+            expect(jsOMS.mathEvaluate('3 + 4 * 2 / ( 1 - 5 ) ^ 2 ^ 3 + 1.5')).toBeCloseTo(4.5, 2);
+            expect(jsOMS.mathEvaluate('invalid')).toBe(null);
+        });
     });
-
+});
-    afterEach(function ()
-    {
-    });
-});

tests/SpecRunner.html

@@ -25,10 +25,9 @@
     <script src="../Account/AccountType.js"></script>
 
     <script src="../Config/Options.js"></script>
-
     <script src="../DataStorage/LocalStorage.js"></script>
-
     <script src="../Event/EventManager.js"></script>
+    <script src="../Math/MathProcessor.js"></script>
 
     <script src="../Uri/Http.js"></script>
     <script src="../Uri/UriFactory.js"></script>
@@ -41,10 +40,9 @@
     <script src="Account/AccountTypeTest.js"></script>
 
     <script src="Config/OptionsTest.js"></script>
-
     <script src="DataStorage/LocalStorageTest.js"></script>
-
     <script src="Event/EventManagerTest.js"></script>
+    <script src="Math/MathProcessorTest.js"></script>
 
     <script src="Uri/HttpTest.js"></script>
     <script src="Uri/UriFactoryTest.js"></script>