Add test for Component.Disposed event.

Author: bgrainger

src/AdoNet.Specification.Tests/ConnectionTestBase.cs

@@ -230,6 +230,28 @@ public virtual void Dispose_can_be_called_more_than_once()
 		connection.Dispose();
 	}
 
+	[Fact]
+	public virtual void Dispose_raises_Disposed()
+	{
+		var connection = CreateOpenConnection();
+		var disposedCount = 0;
+		connection.Disposed += (s, e) => disposedCount++;
+		connection.Dispose();
+		Assert.Equal(1, disposedCount);
+	}
+
+#if NETSTANDARD2_1_OR_GREATER
+	[Fact]
+	public virtual async Task DisposeAsync_raises_Disposed()
+	{
+		var connection = CreateOpenConnection();
+		var disposedCount = 0;
+		connection.Disposed += (s, e) => disposedCount++;
+		await connection.DisposeAsync().ConfigureAwait(false);
+		Assert.Equal(1, disposedCount);
+	}
+#endif
+
 	[Fact]
 	public virtual void CreateCommand_returns_command()
 	{