Add more unit test

YesNt.Interpreter.Tests/CodeFowStatementsTests.cs

@@ -34,10 +34,4 @@ public class CodeFlowTests
         ];
         YesNtAssert.IsLastLineEqual(lines, "1");
     }
-
-    [TestMethod]
-    public void CalculationsTest()
-    {
-        YesNtAssert.IsLineEqual("10 * 10 !calc", 100.ToString());
-    }
 }

YesNt.Interpreter.Tests/ProcessingStatementsTests.cs

@@ -0,0 +1,43 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace YesNt.Interpreter.Tests;
+
+[TestClass]
+public class ProcessingStatementsTests
+{
+    [TestMethod]
+    public void MultiplicationTest()
+    {
+        YesNtAssert.IsLineEqual("10 * 10 !calc", "100");
+    }
+
+    [TestMethod]
+    public void DivisionTest()
+    {
+        YesNtAssert.IsLineEqual("90 / 4 !calc", "22.5");
+    }
+
+    [TestMethod]
+    public void AdditionTest()
+    {
+        YesNtAssert.IsLineEqual("10 + 10 !calc", "20");
+    }
+
+    [TestMethod]
+    public void SubtractionTest()
+    {
+        YesNtAssert.IsLineEqual("10 - 10 !calc", "0");
+    }
+
+    [TestMethod]
+    public void ModulusTest()
+    {
+        YesNtAssert.IsLineEqual("10 % 3 !calc", "1");
+    }
+
+    [TestMethod]
+    public void ExponentiationTest()
+    {
+        YesNtAssert.IsLineEqual("2 ^ 3 !calc", "8");
+    }
+}