added docstring checker test

tests/test_docstrings.py

@@ -0,0 +1,126 @@
+import inspect
+from types import ModuleType, FunctionType
+from typing import List
+import pytest
+import roiextractors
+
+
+def traverse_class(class_object: type, parent: str) -> List[FunctionType]:
+    """Traverse the class dictionary and return the methods overridden by this module.
+
+    Parameters
+    ----------
+    class_object : type
+        The class to traverse.
+    parent : str
+        The parent package name.
+
+    Returns
+    -------
+    class_methods : List[FunctionType]
+        A list of all methods defined in the given class.
+    """
+    class_methods = []
+    for attribute_name, attribute_value in class_object.__dict__.items():
+        if isinstance(attribute_value, FunctionType) and attribute_value.__module__.startswith(parent):
+            if attribute_name.startswith("__") and attribute_name.endswith("__"):
+                continue
+            class_methods.append(attribute_value)
+    return class_methods
+
+
+def traverse_module(module: ModuleType, parent: str) -> List:
+    """Traverse the module and return all classes and functions defined along the way.
+
+    Parameters
+    ----------
+    module : ModuleType
+        The module to traverse.
+    parent : str
+        The parent package name.
+
+    Returns
+    -------
+    local_classes_and_functions : List
+        A list of all classes and functions defined in the given module.
+    """
+    local_classes_and_functions = []
+
+    for name in dir(module):
+        if name.startswith("__") and name.endswith("__"):  # skip all magic methods
+            continue
+
+        object_ = getattr(module, name)
+
+        if isinstance(object_, type) and object_.__module__.startswith(parent):  # class
+            class_object = object_
+            class_functions = traverse_class(class_object=class_object, parent=parent)
+            local_classes_and_functions.append(class_object)
+            local_classes_and_functions.extend(class_functions)
+
+        elif isinstance(object_, FunctionType) and object_.__module__.startswith(parent):
+            function = object_
+            local_classes_and_functions.append(function)
+
+    return local_classes_and_functions
+
+
+def traverse_package(package: ModuleType, parent: str) -> List[ModuleType]:
+    """Traverse the package and return all subpackages and modules defined along the way.
+
+    Parameters
+    ----------
+    package : ModuleType
+        The package, subpackage, or module to traverse.
+    parent : str
+        The parent package name.
+
+    Returns
+    -------
+    local_packages_and_modules : List[ModuleType]
+        A list of all subpackages and modules defined in the given package.
+    """
+    local_packages_and_modules = []
+
+    for name in dir(package):
+        if name.startswith("__") and name.endswith("__"):  # skip all magic methods
+            continue
+
+        object_ = getattr(package, name)
+
+        if (
+            isinstance(object_, ModuleType)
+            and object_.__file__[-11:] == "__init__.py"
+            and object_.__package__.startswith(parent)
+        ):
+            subpackage = object_
+            subpackage_members = traverse_package(package=subpackage, parent=parent)
+            local_packages_and_modules.append(subpackage)
+            local_packages_and_modules.extend(subpackage_members)
+
+        elif isinstance(object_, ModuleType) and object_.__package__.startswith(parent):
+            module = object_
+            module_members = traverse_module(module=module, parent=parent)
+            local_packages_and_modules.append(module)
+            local_packages_and_modules.extend(module_members)
+
+    return local_packages_and_modules
+
+
+objs = traverse_package(roiextractors, "roiextractors")
+
+
+@pytest.mark.parametrize("obj", objs)
+def test_has_docstring(obj):
+    """Check if an object has a docstring."""
+    doc = inspect.getdoc(obj)
+    if inspect.ismodule(obj):
+        msg = f"{obj.__name__} has no docstring."
+    else:
+        msg = f"{obj.__module__}.{obj.__qualname__} has no docstring."
+    assert doc is not None, msg
+
+
+if __name__ == "__main__":
+    for obj in objs:
+        test_has_docstring(obj)