added unit tests for changes

Author: SonOfSardaar

src/TestStack.BDDfy.Tests/Scanner/FluentScanner/AmbiguousHeaderMatchTests.cs

@@ -0,0 +1,33 @@
+using System.Reflection;
+using Shouldly;
+using Xunit;
+
+namespace TestStack.BDDfy.Tests.Scanner.FluentScanner
+{
+    public class AmbiguousHeaderMatchTests
+    {
+        private int _count;
+
+        [Fact]
+        public void ThrowsWhenMultipleHeadersMatchParameterName()
+        {
+            // Act & Assert
+            var exception = Should.Throw<AmbiguousMatchException>(() =>
+            {
+                this.Given(_ => GivenInput(_count))  // Will try to bind _count to both "count" and "Count" headers
+                    .WithExamples(new ExampleTable("count", "Count") // Deliberately ambiguous headers
+                    {
+                        { 5, 10 }
+                    })
+                    .BDDfy();
+            });
+
+            exception.Message.ShouldBe("More than one headers for examples, match the parameter 'count' provided for 'GivenInput'");
+        }
+
+        private void GivenInput(int count)
+        {
+            // The method exists just to trigger the ambiguous header match
+        }
+    }
+}