Add failing and skipped test

Author: bkoelman

test/TestBuildingBlocks/DummyTest.cs

@@ -1,3 +1,4 @@
+using FluentAssertions;
 using Xunit;
 
 namespace TestBuildingBlocks;
@@ -10,4 +11,16 @@ public void Empty()
         // This dummy test exists solely to suppress the warning
         // during test runs that no tests were found in this project.
     }
+
+    [Fact]
+    public void FailAlways()
+    {
+        true.Should().BeFalse();
+    }
+
+    [Fact(Skip = "Test updated GHA")]
+    public void SkipAlways()
+    {
+        true.Should().BeFalse();
+    }
 }