integration tests: use session and module fixtures

tests/integration/rancherostest/conftest.py

@@ -0,0 +1,8 @@
+import os
+import pytest
+
+
+@pytest.fixture(scope="session", autouse=True)
+def my_own_session_run_at_beginning():
+    os.chdir('../..')
+    print('\nChdir to project root dir')

tests/integration/rancherostest/test_system.py

@@ -1,21 +1,25 @@
-import os
+import pytest
 import string
 import subprocess
-import pytest
+
+
+@pytest.fixture(scope="module")
+def qemu(request):
+    p = subprocess.Popen('./scripts/run', stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+
+    def fin():
+        p.stdout.close()
+        p.terminate()
+
+    request.addfinalizer(fin)
+    return p
 
 
 @pytest.mark.timeout(20)
-def test_system_boot():
-    os.chdir('../..')
-    p = subprocess.Popen('./scripts/run', stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-    try:
-        for ln in iter(p.stdout.readline, ''):
-            l = string.strip(ln)
-            ros_booted_substr = string.find(l, 'RancherOS v0.3.1-rc2 started')
-            if ros_booted_substr > -1:
-                assert True
-                return
-    finally:
-        p.stdout.close()
-        p.terminate()
-        p.wait()
+def test_system_boot(qemu):
+    for ln in iter(qemu.stdout.readline, ''):
+        l = string.strip(ln)
+        ros_booted_substr = string.find(l, 'RancherOS v0.3.1-rc2 started')
+        if ros_booted_substr > -1:
+            assert True
+            return