public void RequiredFieldsInExtensions()
{
var message = new TestAllExtensions();
Assert.True(message.IsInitialized());
message.SetExtension(TestRequired.Extensions.Single, new TestRequired());
Assert.False(message.IsInitialized());
var extensionMessage = message.GetExtension(TestRequired.Extensions.Single);
extensionMessage.A = 1;
extensionMessage.B = 2;
extensionMessage.C = 3;
Assert.True(message.IsInitialized());
message.GetOrInitializeExtension(TestRequired.Extensions.Multi);
Assert.True(message.IsInitialized());
message.GetExtension(TestRequired.Extensions.Multi).Add(new TestRequired());
Assert.False(message.IsInitialized());
extensionMessage = message.GetExtension(TestRequired.Extensions.Multi)[0];
extensionMessage.A = 1;
extensionMessage.B = 2;
extensionMessage.C = 3;
Assert.True(message.IsInitialized());
message.SetExtension(UnittestExtensions.OptionalBoolExtension, true);
Assert.True(message.IsInitialized());
message.GetOrInitializeExtension(UnittestExtensions.RepeatedBoolExtension).Add(true);
Assert.True(message.IsInitialized());
}