Orchard.ContentManagement.ContentPart.Weld C# (CSharp) Method

        public void Weld(ContentField field) {
            _fields.Add(field);
        }

        public void NullCheckingCanBeDoneOnProperties() {
            var contentItem = new ContentItem();
            var contentPart = new ContentPart { TypePartDefinition = new ContentTypePartDefinition(new ContentPartDefinition("FooPart"), new SettingsDictionary()) };
            var contentField = new ContentField { PartFieldDefinition = new ContentPartFieldDefinition(new ContentFieldDefinition("FooType"), "FooField", new SettingsDictionary()) };

            dynamic item = contentItem;
            dynamic part = contentPart;

            Assert.That(item.FooPart == null, Is.True);
            Assert.That(item.FooPart != null, Is.False);

            contentItem.Weld(contentPart);

            Assert.That(item.FooPart == null, Is.False);
            Assert.That(item.FooPart != null, Is.True);
            Assert.That(item.FooPart, Is.SameAs(contentPart));

            Assert.That(part.FooField == null, Is.True);
            Assert.That(part.FooField != null, Is.False);
            Assert.That(item.FooPart.FooField == null, Is.True);
            Assert.That(item.FooPart.FooField != null, Is.False);

            contentPart.Weld(contentField);

            Assert.That(part.FooField == null, Is.False);
            Assert.That(part.FooField != null, Is.True);
            Assert.That(item.FooPart.FooField == null, Is.False);
            Assert.That(item.FooPart.FooField != null, Is.True);
            Assert.That(part.FooField, Is.SameAs(contentField));
            Assert.That(item.FooPart.FooField, Is.SameAs(contentField));
        }