1 files changed, 12 insertions, 6 deletions
diff --git a/src/System.Runtime.InteropServices/tests/System/Runtime/InteropServices/ProgIdAttributeTests.cs b/src/System.Runtime.InteropServices/tests/System/Runtime/InteropServices/ProgIdAttributeTests.cs
index a0e00935cd..402fb5569f 100644
--- a/src/System.Runtime.InteropServices/tests/System/Runtime/InteropServices/ProgIdAttributeTests.cs
+++ b/src/System.Runtime.InteropServices/tests/System/Runtime/InteropServices/ProgIdAttributeTests.cs
@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-using System.Linq;
-using System.Reflection;
 using Xunit;
 
 namespace System.Runtime.InteropServices.Tests
@@ -14,10 +12,18 @@ namespace System.Runtime.InteropServices.Tests
         [Fact]
         public void Exists()
         {
-            var type = typeof(ProgIdAttributeTests);
-            var attr = type.GetCustomAttributes(typeof(ProgIdAttribute), false).OfType<ProgIdAttribute>().SingleOrDefault();
-            Assert.NotNull(attr);
-            Assert.Equal("pizza", attr.Value);
+            Type type = typeof(ProgIdAttributeTests);
+            ProgIdAttribute attribute = Assert.IsType<ProgIdAttribute>(Assert.Single(type.GetCustomAttributes(typeof(ProgIdAttribute), false)));
+            Assert.Equal("pizza", attribute.Value);
+        }
+
+        [Theory]
+        [InlineData(null)]
+        [InlineData("ProgId")]
+        public void Ctor_ProgId(string progId)
+        {
+            var attribute = new ProgIdAttribute(progId);
+            Assert.Equal(progId, attribute.Value);
         }
     }
 }