Inital Commit

MathEngine/EngineTests/Parser Tests/ExpressionTreeTests.cs

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+using MathEngine.Parser.Tokeniser;
+using MathEngine.Parser.Parser;
+namespace EngineTests
+{
+    /// <summary>
+    /// Class for testing the ExpressionTree Class
+    /// </summary>
+    [TestClass]
+    public class ExpressionTreeTests
+    {
+
+        /// <summary>
+        /// Test to see if a simple expression is constructed correctly
+        /// </summary>
+        [TestMethod]
+        public void TestExpressionTreeSimpleExpression()
+        {
+            string testExp = "3+4";
+            TreeNode exptectedTree = new(Token.Plus);
+            Token tokfour = new("4", Token.Type.Numeric, Token.NumericType.Decimal, 0);
+            Token tokthree = new("3", Token.Type.Numeric, Token.NumericType.Decimal, 0);
+            TreeNode four = new(tokfour);
+            TreeNode three = new(tokthree);
+            exptectedTree.AddChildNode(four);
+            exptectedTree.AddChildNode(three);
+            ExpressionTree returnedTree = new ExpressionTree(testExp);
+            Assert.IsTrue(returnedTree.Equals(exptectedTree));
+        }
+
+        /// <summary>
+        /// Test to see if a simple expression is evaluated correctly
+        /// </summary>
+        [TestMethod]
+        public void TestExpressionTreeSimpleExpressionEvaluation()
+        {
+            string testExp = "3+4*7";
+            Token tok31 = new("31", Token.Type.Numeric, Token.NumericType.Decimal, 0);
+            TreeNode exptectedTree = new(tok31);
+            ExpressionTree returnedTree = new ExpressionTree(testExp);
+            ExpressionTree evaluatedTree = returnedTree.Evaluate();
+            Assert.IsTrue(evaluatedTree.Equals(exptectedTree));
+        }
+
+        /// <summary>
+        /// Test to see if a simple expression using all base operators (+,-,*,/) is evaluated correctly
+        /// </summary>
+        [TestMethod]
+        public void TestExpressionTreeSimpleExpressionAllBaseOperatorsEvaluation()
+        {
+            string testExp = "3+4*7-8/7";
+            decimal testValue = decimal.Divide(209 , 7);
+            Token tok31 = new(testValue.ToString(), Token.Type.Numeric, Token.NumericType.Decimal, 0);
+            TreeNode exptectedTree = new(tok31);
+            ExpressionTree returnedTree = new ExpressionTree(testExp);
+            ExpressionTree evaluatedTree = returnedTree.Evaluate();
+            Assert.IsTrue(evaluatedTree.Equals(exptectedTree));
+        }
+    }
+}