Release/2.0.0 - Add tests for EventArgs serialization (#25940)

src/System.Runtime.Serialization.Formatters/tests/BinaryFormatterTestData.cs

@@ -809,6 +809,10 @@ private static IEnumerable<object[]> SerializableObjects()
             yield return new object[] { (int?)1, new string[] { "AAEAAAD/////AQAAAAAAAAAEAQAAAAxTeXN0ZW0uSW50MzIBAAAAB21fdmFsdWUACAEAAAAL", "AAEAAAD/////AQAAAAAAAAAEAQAAAAxTeXN0ZW0uSW50MzIBAAAAB21fdmFsdWUACAEAAAAL" } };
             yield return new object[] { (StructWithIntField?)new StructWithIntField() { X = 42 }, new string[] { "AAEAAAD/////AQAAAAAAAAAMAgAAAHBTeXN0ZW0uUnVudGltZS5TZXJpYWxpemF0aW9uLkZvcm1hdHRlcnMuVGVzdHMsIFZlcnNpb249NC4wLjIuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj05ZDc3Y2M3YWQzOWI2OGViBQEAAABAU3lzdGVtLlJ1bnRpbWUuU2VyaWFsaXphdGlvbi5Gb3JtYXR0ZXJzLlRlc3RzLlN0cnVjdFdpdGhJbnRGaWVsZAEAAAABWAAIAgAAACoAAAAL", "AAEAAAD/////AQAAAAAAAAAMAgAAAHBTeXN0ZW0uUnVudGltZS5TZXJpYWxpemF0aW9uLkZvcm1hdHRlcnMuVGVzdHMsIFZlcnNpb249NC4wLjMuMCwgQ3VsdHVyZT1uZXV0cmFsLCBQdWJsaWNLZXlUb2tlbj05ZDc3Y2M3YWQzOWI2OGViBQEAAABAU3lzdGVtLlJ1bnRpbWUuU2VyaWFsaXphdGlvbi5Gb3JtYXR0ZXJzLlRlc3RzLlN0cnVjdFdpdGhJbnRGaWVsZAEAAAABWAAIAgAAACoAAAAL" } };
 
+            // EventArgs
+            yield return new object[] { EventArgs.Empty, new string[] { "AAEAAAD/////AQAAAAAAAAAEAQAAABBTeXN0ZW0uRXZlbnRBcmdzAAAAAAs=", "AAEAAAD/////AQAAAAAAAAAEAQAAABBTeXN0ZW0uRXZlbnRBcmdzAAAAAAs=" } };
+            yield return new object[] { new EventArgs(), new string[] { "AAEAAAD/////AQAAAAAAAAAEAQAAABBTeXN0ZW0uRXZlbnRBcmdzAAAAAAs=", "AAEAAAD/////AQAAAAAAAAAEAQAAABBTeXN0ZW0uRXZlbnRBcmdzAAAAAAs=" } };
+
             // Nullable equality comparer roundtrips as opposed to other equality comparers which serialize to ObjectEqualityComparer
             yield return new object[] { EqualityComparer<int>.Default, new string[] { "AAEAAAD/////AQAAAAAAAAAEAQAAAJEBU3lzdGVtLkNvbGxlY3Rpb25zLkdlbmVyaWMuR2VuZXJpY0VxdWFsaXR5Q29tcGFyZXJgMVtbU3lzdGVtLkludDMyLCBtc2NvcmxpYiwgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODldXQAAAAAL", "AAEAAAD/////AQAAAAAAAAAEAQAAAJEBU3lzdGVtLkNvbGxlY3Rpb25zLkdlbmVyaWMuR2VuZXJpY0VxdWFsaXR5Q29tcGFyZXJgMVtbU3lzdGVtLkludDMyLCBtc2NvcmxpYiwgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODldXQAAAAAL" } };
             yield return new object[] { EqualityComparer<long>.Default, new string[] { "AAEAAAD/////AQAAAAAAAAAEAQAAAJEBU3lzdGVtLkNvbGxlY3Rpb25zLkdlbmVyaWMuR2VuZXJpY0VxdWFsaXR5Q29tcGFyZXJgMVtbU3lzdGVtLkludDY0LCBtc2NvcmxpYiwgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODldXQAAAAAL", "AAEAAAD/////AQAAAAAAAAAEAQAAAJEBU3lzdGVtLkNvbGxlY3Rpb25zLkdlbmVyaWMuR2VuZXJpY0VxdWFsaXR5Q29tcGFyZXJgMVtbU3lzdGVtLkludDY0LCBtc2NvcmxpYiwgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODldXQAAAAAL" } };

src/System.Runtime.Serialization.Formatters/tests/EqualityExtensions.cs

@@ -1151,6 +1151,12 @@ public static bool IsEqual(this SqlException @this, SqlException other)
                 CheckEquals(@this.InnerException, other.InnerException);
         }
 
+        public static void IsEqual(this EventArgs @this, EventArgs other)
+        {
+            Assert.NotNull(@this);
+            Assert.NotNull(other);
+        }
+
         public class ReferenceComparer<T> : IEqualityComparer<T> where T: class
         {
             public bool Equals(T x, T y)