Tests: refactored prerequisites model.

test/unit/applications/tls.py

@@ -1,4 +1,5 @@
 import os
+import re
 import ssl
 import subprocess
 from unit.applications.proto import TestApplicationProto
@@ -12,6 +13,27 @@ class TestApplicationTLS(TestApplicationProto):
         self.context.check_hostname = False
         self.context.verify_mode = ssl.CERT_NONE
 
+    @classmethod
+    def setUpClass(cls, complete_check=True):
+        unit = super().setUpClass(complete_check=False)
+
+        # check tls module
+
+        try:
+            subprocess.check_output(['which', 'openssl'])
+
+            output = subprocess.check_output(
+                [unit.unitd, '--version'], stderr=subprocess.STDOUT
+            )
+
+            if re.search('--openssl', output.decode()):
+                cls.available['modules']['openssl'] = []
+
+        except:
+            pass
+
+        return unit if not complete_check else unit.complete()
+
     def certificate(self, name='default', load=True):
         self.openssl_conf()