Major refactor

MathEngine/EngineTests/Expression/ExpressionTests.cs

@@ -0,0 +1,30 @@
+using Xunit;
+
+namespace EngineTests.Expression
+{
+    public class ExpressionTests
+    {
+        /// <summary>
+        /// Test that Evaluate returns valid output
+        /// </summary>
+        [Fact]
+        public void TestTokenizeBasicExpressionEvalutesToCorrectResult()
+        {
+            MathEngine.Expression.Expression test_expression = new("1+1");
+            MathEngine.Expression.Expression expected_result = new("2");
+            Assert.Equivalent(expected_result, test_expression.Evaluate(), true);
+        }
+
+
+        /// <summary>
+        /// Test that Expression involing all basic operators returns valid reuslt
+        /// </summary>
+        [Fact]
+        public void TestTokenizeBasicExpressionAllOperatorsEvalutesToCorrectResult()
+        {
+            MathEngine.Expression.Expression test_expression = new("1+1-2*3/4");
+            MathEngine.Expression.Expression expected_result = new("0.5");
+            Assert.Equivalent(expected_result, test_expression.Evaluate(), true);
+        }
+    }
+}