ansible-test - Allow target prefixes to use `_` (#80021)

Integration test target prefixes defined in a `tests/integration/target-prefixes.{group}` file can now contain an underscore (`_`) character.

changelogs/fragments/ansible-test-integration-target-prefixes.yml

@@ -0,0 +1,4 @@
+bugfixes:
+  - ansible-test - Integration test target prefixes defined in a ``tests/integration/target-prefixes.{group}`` file
+                   can now contain an underscore (``_``) character.
+                   Resolves issue https://github.com/ansible/ansible/issues/79225

test/integration/targets/ansible-test-integration-targets/ansible_collections/ns/col/tests/integration/target-prefixes.something

@@ -0,0 +1,2 @@
+one-part
+two_part

test/integration/targets/ansible-test-integration-targets/test.py

@@ -31,5 +31,17 @@ class OptionsTest(unittest.TestCase):
                     raise Exception(f'{ex}:\n>>> Standard Output:\n{ex.stdout}\n>>> Standard Error:\n{ex.stderr}') from ex
 
 
+class PrefixesTest(unittest.TestCase):
+    def test_prefixes(self):
+        try:
+            command = ['ansible-test', 'integration', '--list-targets']
+
+            something = subprocess.run([*command, 'something/'], text=True, capture_output=True, check=True)
+
+            self.assertEqual(something.stdout.splitlines(), ['one-part_test', 'two_part_test'])
+        except subprocess.CalledProcessError as ex:
+            raise Exception(f'{ex}:\n>>> Standard Output:\n{ex.stdout}\n>>> Standard Error:\n{ex.stderr}') from ex
+
+
 if __name__ == '__main__':
     unittest.main()

test/lib/ansible_test/_internal/target.py

@@ -610,13 +610,9 @@ class IntegrationTarget(CompletionTarget):
         if 'needs/httptester' in groups:
             groups.append('cloud/httptester')  # backwards compatibility for when it was not a cloud plugin
 
-        if '_' in self.name:
+        for prefix, group in prefixes.items():
-            prefix = self.name[:self.name.find('_')]
+            if not self.name.startswith(f'{prefix}_'):
-        else:
+                continue
-            prefix = None
-
-        if prefix in prefixes:
-            group = prefixes[prefix]
 
             if group != prefix:
                 group = '%s/%s' % (group, prefix)