Increase verbosity for tests on CI, enable stderr on error

infracheck/checks/ssh-fingerprint

@@ -43,8 +43,13 @@ class SshFingerprintScan:
 
     @staticmethod
     def _get_fingerprint(domain: str, method: str, port: int) -> str:
-        out = subprocess.check_output(['ssh-keyscan', '-t', method, '-p', str(port), domain], stderr=subprocess.DEVNULL)
-        return out.decode('utf-8')
+        try:
+            out = subprocess.check_output(['ssh-keyscan', '-t', method, '-p', str(port), domain],
+                                          stderr=subprocess.PIPE)
+
+            return out.decode('utf-8')
+        except subprocess.CalledProcessError as err:
+            return err.stderr.decode('utf-8') + "\n" + err.stdout.decode('utf-8')
 
 
 if __name__ == '__main__':

tests/functional_test_ssh_fingerprint_check.py

@@ -39,3 +39,13 @@ def test_missing_host_parameter(self):
 
         self.assertIn('You need to provide a HOST', result.output.strip())
         self.assertFalse(result.exit_status)
+
+    def test_reports_stderr_messages(self):
+        result = run_check('ssh-fingerprint', {
+            'HOST': 'non-existing-host',
+            'PORT': 3222,
+            'EXPECTED_FINGERPRINT': 'BAKUNIN'
+        }, {})
+
+        self.assertIn('getaddrinfo non-existing-host: Name or service not known', result.output.strip())
+        self.assertFalse(result.exit_status)