public void SetValueOfPrivateProperty()
{
var transaction = new Transaction();
var expectedClientId = this.fixture.Create<string>();
#region SOLUTION (commented)
//var clientIdProperty = transaction.GetType().GetProperty("ClientId", BindingFlags.NonPublic | BindingFlags.Instance);
//clientIdProperty.SetValue(transaction, expectedClientId);
#endregion
transaction.GetClientId().Should().Be(expectedClientId);
}