diff --git a/tests/dwCheckApi.Tests/Helpers/CommonHelperTests.cs b/tests/dwCheckApi.Tests/Helpers/CommonHelperTests.cs
new file mode 100644
index 0000000..cfe5041
--- /dev/null
+++ b/tests/dwCheckApi.Tests/Helpers/CommonHelperTests.cs
@@ -0,0 +1,33 @@
+using dwCheckApi.Helpers;
+using Xunit;
+
+namespace dwCheckApi.Tests.Helpers
+{
+    public class CommonHelperTests
+    {
+        [Fact]
+        public void IncorrectUsageOfApi_Returns_NonNull_String()
+        {
+            // Arrange
+            
+            // Act
+            var response = CommonHelpers.IncorrectUsageOfApi();
+            
+            // Assert
+            Assert.NotEmpty(response);
+            Assert.Contains("Incorrect usage of API", response);
+        }
+
+        [Fact]
+        public void GetVersionNumber_Returns_NonNull_String()
+        {
+            // Arrange
+            
+            // Act
+            var response = CommonHelpers.GetVersionNumber();
+            
+            // Assert
+            Assert.NotEmpty(response);
+        }
+    }
+}
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