Tests: features and options checks improved.

Now version output evaluates only once.
OpenSSL checks more carefully.

test/conftest.py

@@ -176,6 +176,9 @@ def pytest_sessionstart(session):
     option.available = {'modules': {}, 'features': {}}
 
     unit = unit_run()
+    output_version = subprocess.check_output(
+        [unit['unitd'], '--version'], stderr=subprocess.STDOUT
+    ).decode()
 
     # read unit.log
 
@@ -202,10 +205,10 @@ def pytest_sessionstart(session):
 
     # discover modules from check
 
-    option.available['modules']['openssl'] = check_openssl(unit['unitd'])
     option.available['modules']['go'] = check_go()
     option.available['modules']['node'] = check_node(option.current_dir)
-    option.available['modules']['regex'] = check_regex(unit['unitd'])
+    option.available['modules']['openssl'] = check_openssl(output_version)
+    option.available['modules']['regex'] = check_regex(output_version)
 
     # remove None values
 

test/unit/check/regex.py

@@ -1,13 +1,8 @@
 import re
-import subprocess
 
 
-def check_regex(unitd):
-    output = subprocess.check_output(
-        [unitd, '--version'], stderr=subprocess.STDOUT
-    )
-
-    if re.search('--no-regex', output.decode()):
+def check_regex(output_version):
+    if re.search('--no-regex', output_version):
         return False
 
     return True

test/unit/check/tls.py

@@ -2,12 +2,11 @@ import re
 import subprocess
 
 
-def check_openssl(unitd):
+def check_openssl(output_version):
+    try:
         subprocess.check_output(['which', 'openssl'])
+    except subprocess.CalledProcessError:
+        return None
 
-    output = subprocess.check_output(
-        [unitd, '--version'], stderr=subprocess.STDOUT
-    )
-
-    if re.search('--openssl', output.decode()):
+    if re.search('--openssl', output_version):
         return True