test(man): fix inactive "required_cmd"

Fixes the test failure of `test_10' (test_man.py).

The decorator `@pytest.mark.complete(require_cmd=True)' is referenced
only when the fixture `completion' is requested.  Since `completion'
was not requested by `test_10', `require_cmd=True' was ignored.  Now
`test_10' checks the command (non-)existence on its own for test
skipping.

Author: akinomyoga

test/t/test_man.py

@@ -4,6 +4,7 @@
     assert_bash_exec,
     assert_complete,
     bash_env_saved,
+    is_bash_type,
     prepare_fixture_dir,
 )
 
@@ -105,8 +106,9 @@ def test_8(self, completion):
     def test_9(self, bash, completion):
         assert self.assumed_present in completion
 
-    @pytest.mark.complete(require_cmd=True)
     def test_10(self, request, bash, colonpath):
+        if not is_bash_type(bash, "man"):
+            pytest.skip("Command not found")
         with bash_env_saved(bash) as bash_env:
             bash_env.write_env(
                 "MANPATH",