ansible-test - Fix traceback when mixing sources (#80801)

* ansible-test - Fix traceback when mixing sources

* ansible-test - Refactor layout error handling

1 files changed, 15 insertions, 0 deletions

diff --git a/test/lib/ansible_test/_internal/provider/layout/ansible.py b/test/lib/ansible_test/_internal/provider/layout/ansible.py
index d2f8cc818a..3ee818a5b5 100644
--- a/test/lib/ansible_test/_internal/provider/layout/ansible.py
+++ b/test/lib/ansible_test/_internal/provider/layout/ansible.py
@@ -8,6 +8,11 @@ from . import (
     LayoutProvider,
 )
 
+from ...util import (
+    ANSIBLE_SOURCE_ROOT,
+    ANSIBLE_TEST_ROOT,
+)
+
 
 class AnsibleLayout(LayoutProvider):
     """Layout provider for Ansible source."""
@@ -26,6 +31,15 @@ class AnsibleLayout(LayoutProvider):
             module_utils='lib/ansible/module_utils',
         )
 
+        errors: list[str] = []
+
+        if root != ANSIBLE_SOURCE_ROOT:
+            errors.extend((
+                f'Cannot test "{root}" with ansible-test from "{ANSIBLE_TEST_ROOT}".',
+                '',
+                f'Did you intend to run "{root}/bin/ansible-test" instead?',
+            ))
+
         return ContentLayout(
             root,
             paths,
@@ -43,4 +57,5 @@ class AnsibleLayout(LayoutProvider):
             unit_module_path='test/units/modules',
             unit_module_utils_path='test/units/module_utils',
             unit_messages=None,
+            unsupported=errors,
         )