test: fix check_required_by (#84153)

* Update the documentation for check_required_by
* Fix return value for check_required_by (now returns empty list on success)

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/module_utils/common/validation.py

@@ -185,7 +185,7 @@ def check_required_by(requirements, parameters, options_context=None):
     :kwarg options_context: List of strings of parent key names if ``requirements`` are
         in a sub spec.
 
-    :returns: Empty dictionary or raises :class:`TypeError` if the
+    :returns: Empty dictionary or raises :class:`TypeError` if the check fails.
     """
 
     result = {}
@@ -195,22 +195,15 @@ def check_required_by(requirements, parameters, options_context=None):
     for (key, value) in requirements.items():
         if key not in parameters or parameters[key] is None:
             continue
-        result[key] = []
         # Support strings (single-item lists)
         if isinstance(value, string_types):
             value = [value]
-        for required in value:
-            if required not in parameters or parameters[required] is None:
-                result[key].append(required)
-
-    if result:
-        for key, missing in result.items():
-            if len(missing) > 0:
-                msg = "missing parameter(s) required by '%s': %s" % (key, ', '.join(missing))
-                if options_context:
-                    msg = "{0} found in {1}".format(msg, " -> ".join(options_context))
-                raise TypeError(to_native(msg))
 
+        if missing := [required for required in value if required not in parameters or parameters[required] is None]:
+            msg = f"missing parameter(s) required by '{key}': {', '.join(missing)}"
+            if options_context:
+                msg = f"{msg} found in {' -> '.join(options_context)}"
+            raise TypeError(to_native(msg))
     return result
 
 

test/units/module_utils/common/validation/test_check_required_by.py

@@ -4,10 +4,10 @@
 
 from __future__ import annotations
 
+import re
 
 import pytest
 
-from ansible.module_utils.common.text.converters import to_native
 from ansible.module_utils.common.validation import check_required_by
 
 
@@ -19,9 +19,7 @@ def path_arguments_terms():
 
 
 def test_check_required_by():
-    arguments_terms = {}
+    assert check_required_by({}, {}) == {}
-    params = {}
-    assert check_required_by(arguments_terms, params) == {}
 
 
 def test_check_required_by_missing():
@@ -30,12 +28,9 @@ def test_check_required_by_missing():
     }
     params = {"force": True}
     expected = "missing parameter(s) required by 'force': force_reason"
-
+    with pytest.raises(TypeError, match=re.escape(expected)):
-    with pytest.raises(TypeError) as e:
         check_required_by(arguments_terms, params)
 
-    assert to_native(e.value) == expected
-
 
 def test_check_required_by_multiple(path_arguments_terms):
     params = {
@@ -43,21 +38,17 @@ def test_check_required_by_multiple(path_arguments_terms):
     }
     expected = "missing parameter(s) required by 'path': mode, owner"
 
-    with pytest.raises(TypeError) as e:
+    with pytest.raises(TypeError, match=re.escape(expected)):
         check_required_by(path_arguments_terms, params)
 
-    assert to_native(e.value) == expected
-
 
 def test_check_required_by_single(path_arguments_terms):
     params = {"path": "/foo/bar", "mode": "0700"}
     expected = "missing parameter(s) required by 'path': owner"
 
-    with pytest.raises(TypeError) as e:
+    with pytest.raises(TypeError, match=re.escape(expected)):
         check_required_by(path_arguments_terms, params)
 
-    assert to_native(e.value) == expected
-
 
 def test_check_required_by_missing_none(path_arguments_terms):
     params = {
@@ -65,7 +56,7 @@ def test_check_required_by_missing_none(path_arguments_terms):
         "mode": "0700",
         "owner": "root",
     }
-    assert check_required_by(path_arguments_terms, params)
+    assert check_required_by(path_arguments_terms, params) == {}
 
 
 def test_check_required_by_options_context(path_arguments_terms):
@@ -75,11 +66,9 @@ def test_check_required_by_options_context(path_arguments_terms):
 
     expected = "missing parameter(s) required by 'path': owner found in foo_context"
 
-    with pytest.raises(TypeError) as e:
+    with pytest.raises(TypeError, match=re.escape(expected)):
         check_required_by(path_arguments_terms, params, options_context)
 
-    assert to_native(e.value) == expected
-
 
 def test_check_required_by_missing_multiple_options_context(path_arguments_terms):
     params = {
@@ -91,7 +80,5 @@ def test_check_required_by_missing_multiple_options_context(path_arguments_terms
         "missing parameter(s) required by 'path': mode, owner found in foo_context"
     )
 
-    with pytest.raises(TypeError) as e:
+    with pytest.raises(TypeError, match=re.escape(expected)):
         check_required_by(path_arguments_terms, params, options_context)
-
-    assert to_native(e.value) == expected