added unit tests

20250221/UnitTests/UnitTestsTests/Feladat2Tests.cs

@@ -0,0 +1,46 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using UnitTests;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace UnitTests.Tests
+{
+    [TestClass()]
+    public class Feladat2Tests
+    {
+        Feladat2 feladat2 = new Feladat2();
+
+        [TestMethod()]
+        public void ConcatTest()
+        {
+            Assert.AreEqual(feladat2.Concat("a", "b"), ("a" + "b"));
+        }
+
+        [TestMethod()]
+        public void GetLengthTest()
+        {
+            Assert.AreEqual(3, feladat2.GetLength("asd"));
+        }
+
+        [TestMethod()]
+        public void GetNullStringTest()
+        {
+            Assert.IsNull(feladat2.GetNullString());
+        }
+
+        [TestMethod()]
+        public void GetStringInstanceTest()
+        {
+            Assert.AreEqual("", feladat2.GetStringInstance());
+        }
+
+        [TestMethod()]
+        public void IsEmptyTest()
+        {
+            Assert.IsTrue(feladat2.IsEmpty(""));
+        }
+    }
+}