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2021a58aec
The main intent of the test was to show the changed behavior on Windows; previously, `stream_select()` would return immediately there, reporting all pipes as ready; now, it only returns if at least one pipe is actually ready. The original test case was overspecified; of course, we cannot assume that the pipes are ready one after the other; depending on the concrete `select(2)` implementation and the system scheduler, minor differences are to be expected. Thus we relax the test expectations, and now require that not all pipes are reported ready after a single `stream_select()` call, and that the output contains all strings. We also ensure that `stream_select()` doesn't fail (for whatever reason). And in case of the test expectations not being met, we also output some diagnostics (most notably the output that has already been read).