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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity
{
using System.Data.Common;
using Xunit;
public class ConnectionEventsTracker
{
private int countOpenClose;
private int countCloseOpen;
private int countOtherConnectionStates;
public ConnectionEventsTracker(DbConnection connection)
{
if (connection == null)
{
throw new ArgumentException("Cannot track events for a null connection!");
}
connection.StateChange += OnStateChange;
}
/// <summary>
/// Verifies the no connection events were fired.
/// </summary>
public void VerifyNoConnectionEventsWereFired()
{
Assert.True(countOpenClose == 0);
Assert.True(countCloseOpen == 0);
Assert.True(countOtherConnectionStates == 0);
}
/// <summary>
/// Verifies the connection open and close events were fired.
/// </summary>
public void VerifyConnectionOpenCloseEventsWereFired()
{
Assert.True(countCloseOpen == 1);
Assert.True(countOpenClose == 1);
Assert.True(countOtherConnectionStates == 0);
}
/// <summary>
/// Verifies the connection opened event was fired.
/// </summary>
public void VerifyConnectionOpenedEventWasFired()
{
Assert.True(countCloseOpen == 1);
Assert.True(countOpenClose == 0);
Assert.True(countOtherConnectionStates == 0);
}
/// <summary>
/// Verifies the connection closed event was fired.
/// </summary>
public void VerifyConnectionClosedEventWasFired()
{
Assert.True(countOpenClose == 1);
Assert.True(countCloseOpen == 0);
Assert.True(countOtherConnectionStates == 0);
}
public void ResetEventCounters()
{
countOpenClose = countCloseOpen = countOtherConnectionStates = 0;
}
private void OnStateChange(object sender, StateChangeEventArgs args)
{
if (args.OriginalState == ConnectionState.Closed
&& args.CurrentState == ConnectionState.Open)
{
countCloseOpen++;
}
else if (args.OriginalState == ConnectionState.Open
&& args.CurrentState == ConnectionState.Closed)
{
countOpenClose++;
}
else
{
countOtherConnectionStates++;
}
}
}
}
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