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This test is real time based as it also tests the `:earlier` and `:later` commands with time arguments (using `:sleep`). This can sometimes case the test to fail on systems that are under heavy load or where the time interval between creating the expected buffer state and the `:earlier` or `:later` command that tries to jump to it changes. To be system independent we use nvim's `:sleep` command and `wait()` for it in the test suit. The legacy vim test writes to test.out a lot with `:.w >>test.out`. This does currently not work in the lua test suite so the test is modernized to use busted's assertions instead of the output file. This test was treated special in the legacy Makefile but after the conversion the related code can be removed.