42   file read_end, write_end;  in open_file()  local
43   file::pipe(read_end, write_end);  in open_file()
44   write_end.write(FILE_CONTENT, std::strlen(FILE_CONTENT));  in open_file()
45   write_end.close();  in open_file()
297   file read_end, write_end;  in TEST()  local
298   file::pipe(read_end, write_end);  in TEST()
299   write(write_end, "test");  in TEST()
300   write_end.close();  in TEST()
359   file read_end, write_end;  in TEST()  local
360   file::pipe(read_end, write_end);  in TEST()
362   EXPECT_NE(-1, write_end.descriptor());  in TEST()
363   write(write_end, "test");  in TEST()
368   file read_end, write_end;  in TEST()  local
369   file::pipe(read_end, write_end);  in TEST()