public void TestMakeReadOnly()
{
var serviceCollection = new ServiceCollection();
var descriptor = new ServiceDescriptor(typeof(IFakeService), new FakeService());
serviceCollection.Add(descriptor);
serviceCollection.MakeReadOnly();
var descriptor2 = new ServiceDescriptor(typeof(IFakeEveryService), new FakeService());
Assert.Throws <InvalidOperationException>(() => serviceCollection[0] = descriptor2);
Assert.Throws <InvalidOperationException>(() => serviceCollection.Clear());
Assert.Throws <InvalidOperationException>(() => serviceCollection.Remove(descriptor));
Assert.Throws <InvalidOperationException>(() => serviceCollection.Add(descriptor2));
Assert.Throws <InvalidOperationException>(() => serviceCollection.Insert(0, descriptor2));
Assert.Throws <InvalidOperationException>(() => serviceCollection.RemoveAt(0));
Assert.True(serviceCollection.IsReadOnly);
Assert.Equal(1, serviceCollection.Count);
foreach (ServiceDescriptor d in serviceCollection)
{
Assert.Equal(descriptor, d);
}
Assert.Equal(descriptor, serviceCollection[0]);
Assert.True(serviceCollection.Contains(descriptor));
Assert.Equal(0, serviceCollection.IndexOf(descriptor));
ServiceDescriptor[] copyArray = new ServiceDescriptor[1];
serviceCollection.CopyTo(copyArray, 0);
Assert.Equal(descriptor, copyArray[0]);
// ensure MakeReadOnly can be called twice, and it is just ignored
serviceCollection.MakeReadOnly();
Assert.True(serviceCollection.IsReadOnly);
}
