My experience is that --run_test is not cumulative on the command line. Unless there is some accepted pattern that would match exactly and only the tests you're interested in running, you'd need to invoke the test from the command line once for each --run_test you wish (in this case, three times, I would guess).
If this particular aggregation of tests is common, then you could re-group your test cases such that they are in a single suite. It would be convenient if there were a way to create a suite that aggregates and refers to other cases/suites, though it's not clear to me how that would work in the general case where one just fires up the test to run--would those referred-to tests run multiple times, or just once?