diff --git a/USqlCSharpUdoUnitTestProject1/UnitTest1.cs b/USqlCSharpUdoUnitTestProject1/UnitTest1.cs
index dcb81d2..5c8fa70 100644
--- a/USqlCSharpUdoUnitTestProject1/UnitTest1.cs
+++ b/USqlCSharpUdoUnitTestProject1/UnitTest1.cs
@@ -178,6 +178,35 @@ namespace USqlCSharpUdoUnitTestProject1
             double result3 = 9;
             double result4 = 0.69444444444444444444444444444444;
 
+            Assert.AreEqual(Calculator1.Addiction(x, y), result1);
+            Assert.AreEqual(Calculator1.Subtraction(x, y), result2);
+            Assert.AreEqual(Calculator1.Multipliction(x, y), result3);
+            Assert.AreEqual(Calculator1.Division(x, y), result4);
+        }
+        [TestMethod]
+        public void TestMethod9()
+        {
+            double large = double.MaxValue;
+
+            double result1 = 0;
+            double result2 = 1;
+
+            Assert.IsTrue(double.IsInfinity(Calculator1.Addiction(large, large)));
+            Assert.IsTrue(double.IsInfinity(Calculator1.Multipliction(large, large)));
+            Assert.AreEqual(Calculator1.Subtraction(large, large), result1);
+            Assert.AreEqual(Calculator1.Division(large, large), result2);
+        }
+        [TestMethod]
+        public void TestMethod10()
+        {
+            double x = 1e-308;
+            double y = 2e-308;
+
+            double result1 = 1e-320;
+            double result2 = -1e-308;
+            double result3 = 0;
+            double result4 = 0.5;
+
             Assert.AreEqual(Calculator1.Addiction(x, y), result1);
             Assert.AreEqual(Calculator1.Subtraction(x, y), result2);
             Assert.AreEqual(Calculator1.Multipliction(x, y), result3);