In Shell Oil Co. v. Leftwich, 212 Va. 715, 187 S.E.2d 162 (1972), the Supreme Court set forth the test the Court must use in determining whether claimant was engaged in Hilltop's trade, business, or occupation: "The test is not one of whether the subcontractor's activity is useful, necessary, or even absolutely indispensable to the statutory employer's business, since, after all, this could be said of practically any repair, construction or transportation service. The test (except in cases where the work is obviously a subcontracted fraction of a main contract) is whether this indispensable activity is, in the business, normally carried on through employees rather than independent contractors." Id. at 722, 187 S.E.2d at 167.