Fix the testing of extension module names in test_signatures

Previously names that were both in the extension module and the main namespace
were only tested in the extension module both times. Now the two are tested
separately. Extension module names are also more explicit in the test
parameterizations as a result.

Author: asmeurer

array_api_tests/test_signatures.py

@@ -21,12 +21,12 @@ def stub_module(name):
 def extension_module(name):
     return name in submodules and name in function_stubs.__all__
 
-extension_module_names = {}
+extension_module_names = []
 for n in function_stubs.__all__:
     if extension_module(n):
-        extension_module_names.update({i: n for i in getattr(function_stubs, n).__all__})
+        extension_module_names.extend([f'{n}.{i}' for i in getattr(function_stubs, n).__all__])
 
-all_names = function_stubs.__all__ + list(extension_module_names)
+all_names = function_stubs.__all__ + extension_module_names
 
 def array_method(name):
     return stub_module(name) == 'array_object'
@@ -134,8 +134,8 @@ def example_argument(arg, func_name, dtype):
 def test_has_names(name):
     if extension_module(name):
         assert hasattr(mod, name), f'{mod_name} is missing the {name} extension'
-    elif name in extension_module_names:
-        extension_mod = extension_module_names[name]
+    elif '.' in name:
+        extension_mod, name = name.split('.')
         assert hasattr(getattr(mod, extension_mod), name), f"{mod_name} is missing the {function_category(name)} extension function {name}()"
     elif array_method(name):
         arr = ones((1, 1))
@@ -178,9 +178,10 @@ def test_function_positional_args(name):
         else:
             _mod = example_argument('self', name, dtype)
         stub_func = getattr(function_stubs, name)
-    elif name in extension_module_names:
-        _mod = getattr(mod, extension_module_names[name])
-        stub_func = getattr(getattr(function_stubs, extension_module_names[name]), name)
+    elif '.' in name:
+        extension_module_name, name = name.split('.')
+        _mod = getattr(mod, extension_module_name)
+        stub_func = getattr(getattr(function_stubs, extension_module_name), name)
     else:
         _mod = mod
         stub_func = getattr(function_stubs, name)
@@ -230,9 +231,10 @@ def test_function_keyword_only_args(name):
     if array_method(name):
         _mod = ones((1, 1))
         stub_func = getattr(function_stubs, name)
-    elif name in extension_module_names:
-        _mod = getattr(mod, extension_module_names[name])
-        stub_func = getattr(getattr(function_stubs, extension_module_names[name]), name)
+    elif '.' in name:
+        extension_module_name, name = name.split('.')
+        _mod = getattr(mod, extension_module_name)
+        stub_func = getattr(getattr(function_stubs, extension_module_name), name)
     else:
         _mod = mod
         stub_func = getattr(function_stubs, name)