Clarify reasons for skipped tests

Author: MarkusG

EntityFramework.Exceptions.Tests/OracleTests.cs

@@ -13,8 +13,7 @@ public OracleTests(OracleTestContextFixture fixture) : base(fixture.DemoContext)
     }
 
 #if BULK_OPERATIONS
-    // TODO support ORA-01407: cannot update (string) to NULL 
-    [Fact(Skip = "Oracle has differing error codes for inserting null and updating to null")]
+    [Fact(Skip = "Skipping until ORA-01407 is supported")]
     public override Task RequiredColumnViolationThrowsCannotInsertNullExceptionThroughExecuteUpdate()
     {
         return Task.CompletedTask;

EntityFramework.Exceptions.Tests/SqliteTests.cs

@@ -42,8 +42,7 @@ public override Task NumericOverflowViolationThrowsNumericOverflowException()
         }
 
 #if BULK_OPERATIONS
-        // TODO figure this out
-        [Fact(Skip = "Skipping because SQLite appears to not check this")]
+        [Fact(Skip = "Skipping due to an EF Core bug fixed in EF Core 9")]
         public override Task MaxLengthViolationThrowsMaxLengthExceededExceptionThroughExecuteUpdate()
         {
             return Task.CompletedTask;