Fix incorrect test results.

If ExecuteReader doesn't throw, it may need to be disposed to prevent a different failure later.

Author: bgrainger

src/AdoNet.Specification.Tests/CommandTestBase.cs

@@ -158,7 +158,12 @@ public virtual void ExecuteReader_throws_when_transaction_required()
 
 				using (connection.BeginTransaction())
 				{
-					Assert.Throws<InvalidOperationException>(() => command.ExecuteReader());
+					Assert.Throws<InvalidOperationException>(() =>
+					{
+						using (command.ExecuteReader())
+						{
+						}
+					});
 				}
 			}
 		}
@@ -176,7 +181,12 @@ public virtual void ExecuteReader_throws_when_transaction_mismatched()
 				{
 					command.Transaction = otherTransaction;
 
-					Assert.Throws<InvalidOperationException>(() => command.ExecuteReader());
+					Assert.Throws<InvalidOperationException>(() =>
+					{
+						using (command.ExecuteReader())
+						{
+						}
+					});
 				}
 			}
 		}