tests: Factor out pyrun from gpython_test into golang_test

We'll need to use this utility in other places; golang_test is the
central place for testing utilities.

golang/golang_test.py

@@ -25,6 +25,7 @@ from golang import time
 from pytest import raises
 from os.path import dirname
 import os, sys, threading, inspect, subprocess
+from subprocess import Popen, PIPE
 from six.moves import range as xrange
 import gc, weakref
 
@@ -1016,6 +1017,15 @@ def bench_defer(b):
 
 # ---- misc ----
 
+# pyrun runs `sys.executable argv... <stdin` and returns its output.
+def pyrun(argv, stdin=None, **kw):
+    argv = [sys.executable] + argv
+    p = Popen(argv, stdin=(PIPE if stdin else None), stdout=PIPE, stderr=PIPE, **kw)
+    stdout, stderr = p.communicate(stdin)
+    if p.returncode:
+        raise RuntimeError(' '.join(argv) + '\n' + (stderr and str(stderr) or '(failed)'))
+    return stdout
+
 # panics is similar to pytest.raises and asserts that wrapped code panics with arg.
 class panics:
     def __init__(self, arg):

gpython/gpython_test.py

@@ -21,6 +21,7 @@
 from __future__ import print_function, absolute_import
 
 import sys, os, golang
+from golang.golang_test import pyrun
 from six import PY2
 from six.moves import builtins
 import pytest
@@ -84,16 +85,6 @@ def test_gevent_activated():
         assert patched('queue')
 
 
-# pyrun runs `sys.executable argv... <stdin` and returns its output.
-def pyrun(argv, stdin=None, **kw):
-    from subprocess import Popen, PIPE
-    argv = [sys.executable] + argv
-    p = Popen(argv, stdin=(PIPE if stdin else None), stdout=PIPE, stderr=PIPE, **kw)
-    stdout, stderr = p.communicate(stdin)
-    if p.returncode:
-        raise RuntimeError(' '.join(argv) + '\n' + (stderr and str(stderr) or '(failed)'))
-    return stdout
-
 @gpython_only
 def test_executable():
     # sys.executable must point to gpython and we must be able to execute it.