Size the checks' terminals before the program starts

The live terminal checks forked a pty, started Vega's TUI, and only then
set the window size and sent SIGWINCH. A TUI that read the size first
drew its opening frames at the pty's default size, and replaying them
into the smaller screen failed now and then (one run in about eleven).
The child now sets the size on its own terminal before it starts.

1 files changed, 3 insertions, 4 deletions

diff --git a/tests/check.py b/tests/check.py
index 116121d..b63a728 100644
--- a/tests/check.py
+++ b/tests/check.py
@@ -639,9 +639,9 @@ def timing(vega, module):
     # The terminal, on the clock: start it, and a second and more later it shows that.
     pid, fd = pty.fork()
     if pid == 0:
+        # the size before the program starts: set after, its first frames could be drawn at the pty's default
+        fcntl.ioctl(0, termios.TIOCSWINSZ, struct.pack('HHHH', 8, 30, 0, 0))
         os.execv(str(vega), [str(vega), 'tui', str(module)])
-    fcntl.ioctl(fd, termios.TIOCSWINSZ, struct.pack('HHHH', 8, 30, 0, 0))
-    os.kill(pid, 28)
     screen = b''
 
     def read_for(seconds):
@@ -769,10 +769,9 @@ def interactive(vega, module, store=None, replace=None):
     import fcntl, pty, select, struct, termios, time
     pid, fd = pty.fork()
     if pid == 0:
+        fcntl.ioctl(0, termios.TIOCSWINSZ, struct.pack('HHHH', 10, 40, 0, 0))  # before it starts: no race
         os.execv(str(vega), [str(vega), 'tui', str(module)] + (['--store', str(store)] if store else []) +
                  (['--watch'] if replace else []))
-    fcntl.ioctl(fd, termios.TIOCSWINSZ, struct.pack('HHHH', 10, 40, 0, 0))
-    os.kill(pid, 28)  # SIGWINCH: take the size
 
     def read_for(seconds):
         data, end = b'', time.time() + seconds