TestItem 
    An item shown in the "test explorer" view.
A TestItem can represent either a test suite or a test itself, since they both have similar capabilities.
Properties
Link copied to clipboard
                  Indicates whether this test item may have children discovered by resolving.
Link copied to clipboard
                  The children of this test item. For a test suite, this may contain the individual test cases or nested suites.
Link copied to clipboard
                  Optional description that appears next to the label.
Link copied to clipboard
                  The parent of this item. It's set automatically, and is undefined top-level items in the TestController.items and for items that aren't yet included in another item's children.
Link copied to clipboard
                  Tags associated with this test item. May be used in combination with tags, or simply as an organizational feature.