pytest tests: Enhanced assertion for check_* methods.

Checking if some output is present or absent from standard streams was
done by simple string searching. Due to recent changes in FreeIPA, this
search is not effective due to capitalization differences in boolean
values output. Changing the string searching to regular expression
searches fixes this behavior for current and previous versions of
FreeIPA.

This patch also adds more information on the assert tests in case of an
error, so that it is easier to understand why the test failed.

tests/utils.py

@@ -21,6 +21,7 @@
 
 import os
 import pytest
+import re
 import subprocess
 import tempfile
 import testinfra
@@ -314,6 +315,10 @@ class AnsibleFreeIPATestCase(TestCase):
             expected_msg in result.stderr.decode("utf8")
         )
 
+    @staticmethod
+    def __is_text_on_data(text, data):
+        return re.search(text, data) is not None
+
     def check_details(self, expected_output, cmd, extra_cmds=None):
         cmd = "ipa " + cmd
         if extra_cmds:
@@ -322,10 +327,16 @@ class AnsibleFreeIPATestCase(TestCase):
         res = self.master.run(cmd)
         if res.rc != 0:
             for output in expected_output:
-                assert output in res.stderr
+                assert self.__is_text_on_data(output, res.stderr), (
+                    f"\n{'='*40}\nExpected: {output}\n{'='*40}\n"
+                    + f"Output:\n{res.stderr}{'='*40}\n"
+                )
         else:
             for output in expected_output:
-                assert output in res.stdout
+                assert self.__is_text_on_data(output, res.stdout), (
+                    f"\n{'='*40}\nExpected: {output}\n{'='*40}\n"
+                    + f"Output:\n{res.stdout}{'='*40}\n"
+                )
         kdestroy(self.master)
 
     def check_notexists(self, members, cmd, extra_cmds=None):
@@ -335,7 +346,10 @@ class AnsibleFreeIPATestCase(TestCase):
         kinit_admin(self.master)
         res = self.master.run(cmd)
         for member in members:
-            assert member not in res.stdout
+            assert not self.__is_text_on_data(member, res.stdout), (
+                f"\n{'='*40}\nExpected: {member}\n{'='*40}\n"
+                + f"Output:\n{res.stdout}{'='*40}\n"
+            )
         kdestroy(self.master)
 
     def mark_xfail_using_ansible_freeipa_version(self, version, reason):