diff --git a/pyproject.toml b/pyproject.toml
index ac44995..dcff51d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "jcloud-docsgen"
 version = "0.1.0"
 description = "A project documentation generator"
-dependencies = ["docstring-parser"]
+dependencies = ["docstring-parser", "pytest-dir-equal"]
 license = "Apache-2.0"
 
 [project.scripts]
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
index 75a6ffc..88b17f6 100644
--- a/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator.py
@@ -14,8 +14,9 @@
 
 from src.jcloud_docsgen.core.python import PythonDocumentationGenerator
 from src.jcloud_docsgen.core.python.namespaces import PythonModuleNamespace, PythonPackageNamespace
-import pytest
 from src.jcloud_docsgen.utils import ExistingDirectory
+import pytest
+import pathlib
 
 @pytest.mark.parametrize('project_directory,docs_directory,expected_exception,expected_exception_msg', [
     (1, 1, TypeError, 'expected \'ExistingDirectory\', got \'int\''),
@@ -38,4 +39,24 @@ def test_PythonDocumentationGenerator_exceptions(project_directory, docs_directo
     (PythonDocumentationGenerator(ExistingDirectory('tests/unit/core/python/_core/test_project_dirs/pdir_3'), ExistingDirectory('tests/unit/core/python/_core/test_project_dirs/pdir_3/docs')), [PythonPackageNamespace('pkg', [PythonModuleNamespace('module'), PythonPackageNamespace('pkg', [PythonModuleNamespace('module2')])])]),
 ])
 def test_PythonDocumentationGenerator_collect_modules(python_documentation_generator: PythonDocumentationGenerator, expected):
-    assert python_documentation_generator.namespace() == expected
\ No newline at end of file
+    assert python_documentation_generator.namespace() == expected
+
+@pytest.mark.parametrize('dir', [
+    d.name
+    for d in pathlib.Path('tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/').iterdir()
+])
+def test_generate_documentation(dir, expectdir):
+    with expectdir('test_PythonDocumentationGenerator/test_generate_documentation/' + dir) as d:
+        PythonDocumentationGenerator(
+            ExistingDirectory(
+                str(
+                    pathlib.Path('tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/') /
+                    dir /
+                    'project'
+                )
+            ),
+            ExistingDirectory(str(d)),
+            allow_tables = True,
+            allow_html = False
+        ).generate_documentation(
+        ) # simplify the tests
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/expected/.gitkeep b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/expected/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/initial/.gitkeep b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/initial/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/project/src/.gitkeep b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case01/project/src/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/expected/pkg/module.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/expected/pkg/module.md
new file mode 100644
index 0000000..c95a23a
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/expected/pkg/module.md
@@ -0,0 +1,9 @@
+# Module `pkg.module`
+
+## Function `func`
+
+### Function signature
+
+```python
+func()
+```
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/src/pkg/module.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/src/pkg/module.py
new file mode 100644
index 0000000..6d54bce
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/src/pkg/module.py
@@ -0,0 +1 @@
+def func(): ...
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/exceptions.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/exceptions.md
new file mode 100644
index 0000000..92eaa35
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/exceptions.md
@@ -0,0 +1,37 @@
+# Module `user_management.exceptions`
+
+## Class `UserNotFoundError`
+
+User does not exist.
+
+### Base classes
+
+- `Exception`
+
+
+
+
+
+
+
+### Docstring
+
+User does not exist.
+
+## Class `InvalidEmailError`
+
+Email address is invalid.
+
+### Base classes
+
+- `Exception`
+
+
+
+
+
+
+
+### Docstring
+
+Email address is invalid.
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/models.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/models.md
new file mode 100644
index 0000000..5b9f54b
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/models.md
@@ -0,0 +1,21 @@
+# Module `user_management.models`
+
+## Class `User`
+
+Represents a user.
+
+
+
+
+
+### Decorators
+
+```python
+dataclass
+```
+
+
+
+### Docstring
+
+Represents a user.
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/service.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/service.md
new file mode 100644
index 0000000..1af12f0
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/service.md
@@ -0,0 +1,130 @@
+# Module `user_management.service`
+
+## Class `UserService`
+
+Central class for the user management.
+
+
+
+### Body
+
+#### Constructor (method `__init__`)
+
+##### Method signature
+
+```python
+__init__(self, storage: InMemoryUserStorage)
+```
+
+
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `storage` | `InMemoryUserStorage` | normal | -- | -- |
+
+#### Method `create_user`
+
+Creates and stores a new user.
+
+##### Method signature
+
+```python
+create_user(self, user_id: str, name: str, email: str, age: int | None = None) -> User
+```
+
+##### Returns
+
+Return type: `User`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user_id` | `str` | normal | -- | -- |
+| `name` | `str` | normal | -- | -- |
+| `email` | `str` | normal | -- | -- |
+| `age` | `int | None` | normal | `None` | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Creates and stores a new user.
+
+#### Method `get_user`
+
+Returns a user.
+
+##### Method signature
+
+```python
+get_user(self, user_id: str) -> User
+```
+
+##### Returns
+
+Return type: `User`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user_id` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Returns a user.
+
+#### Method `delete_user`
+
+Deletes a user.
+
+##### Method signature
+
+```python
+delete_user(self, user_id: str) -> None
+```
+
+##### Returns
+
+Return type: `None`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user_id` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Deletes a user.
+
+
+
+
+
+### Docstring
+
+Central class for the user management.
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/storage.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/storage.md
new file mode 100644
index 0000000..8753e51
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/storage.md
@@ -0,0 +1,158 @@
+# Module `user_management.storage`
+
+## Class `InMemoryUserStorage`
+
+A simple in-memory storage for users.
+Intended for testing purposes only.
+
+
+
+### Body
+
+#### Constructor (method `__init__`)
+
+##### Method signature
+
+```python
+__init__(self)
+```
+
+
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+
+#### Method `add`
+
+Adds a user.
+
+##### Method signature
+
+```python
+add(self, user: User) -> None
+```
+
+##### Returns
+
+Return type: `None`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user` | `User` | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Adds a user.
+
+#### Method `get`
+
+Returns a user based on their ID.
+
+##### Method signature
+
+```python
+get(self, user_id: str) -> User
+```
+
+##### Returns
+
+Return type: `User`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user_id` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Returns a user based on their ID.
+
+#### Method `delete`
+
+Deletes a user.
+
+##### Method signature
+
+```python
+delete(self, user_id: str) -> None
+```
+
+##### Returns
+
+Return type: `None`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+| `user_id` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Deletes a user.
+
+#### Method `list_all`
+
+Returns all users.
+
+##### Method signature
+
+```python
+list_all(self) -> List[User]
+```
+
+##### Returns
+
+Return type: `List[User]`
+
+##### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `self` | -- | normal | -- | -- |
+
+
+
+
+
+
+
+##### Docstring
+
+Returns all users.
+
+
+
+
+
+### Docstring
+
+A simple in-memory storage for users.
+Intended for testing purposes only.
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/utils.md b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/utils.md
new file mode 100644
index 0000000..e300902
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/expected/user_management/utils.md
@@ -0,0 +1,61 @@
+# Module `user_management.utils`
+
+## Function `is_valid_email`
+
+Checks whether an email address is valid.
+
+### Function signature
+
+```python
+is_valid_email(email: str) -> bool
+```
+
+### Returns
+
+Return type: `bool`
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `email` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+### Docstring
+
+Checks whether an email address is valid.
+
+## Function `normalize_name`
+
+Removes extra spaces and formats the name.
+
+### Function signature
+
+```python
+normalize_name(name: str) -> str
+```
+
+### Returns
+
+Return type: `str`
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `name` | `str` | normal | -- | -- |
+
+
+
+
+
+
+
+### Docstring
+
+Removes extra spaces and formats the name.
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/exceptions.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/exceptions.py
new file mode 100644
index 0000000..6d29928
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/exceptions.py
@@ -0,0 +1,8 @@
+class UserNotFoundError(Exception):
+    """User does not exist."""
+    pass
+
+
+class InvalidEmailError(Exception):
+    """Email address is invalid."""
+    pass
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/models.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/models.py
new file mode 100644
index 0000000..1f7cc5f
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/models.py
@@ -0,0 +1,13 @@
+from dataclasses import dataclass
+from typing import Optional
+
+
+@dataclass
+class User:
+    """
+    Represents a user.
+    """
+    id: str
+    name: str
+    email: str
+    age: Optional[int] = None
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/service.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/service.py
new file mode 100644
index 0000000..67c2f61
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/service.py
@@ -0,0 +1,48 @@
+from .models import User
+from .storage import InMemoryUserStorage
+from .exceptions import UserNotFoundError, InvalidEmailError
+from .utils import is_valid_email, normalize_name
+
+
+class UserService:
+    """
+    Central class for the user management.
+    """
+
+    def __init__(self, storage: InMemoryUserStorage):
+        self.storage = storage
+
+    def create_user(self, user_id: str, name: str, email: str, age: int | None = None) -> User:
+        """
+        Creates and stores a new user.
+        """
+        if not is_valid_email(email):
+            raise InvalidEmailError(f"Invalid email: {email}")
+
+        user = User(
+            id=user_id,
+            name=normalize_name(name),
+            email=email,
+            age=age
+        )
+
+        self.storage.add(user)
+        return user
+
+    def get_user(self, user_id: str) -> User:
+        """
+        Returns a user.
+        """
+        try:
+            return self.storage.get(user_id)
+        except KeyError:
+            raise UserNotFoundError(user_id)
+
+    def delete_user(self, user_id: str) -> None:
+        """
+        Deletes a user.
+        """
+        try:
+            self.storage.delete(user_id)
+        except KeyError:
+            raise UserNotFoundError(user_id)
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/storage.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/storage.py
new file mode 100644
index 0000000..29ff61d
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/storage.py
@@ -0,0 +1,28 @@
+from typing import Dict, List
+from .models import User
+
+
+class InMemoryUserStorage:
+    """
+    A simple in-memory storage for users.
+    Intended for testing purposes only.
+    """
+
+    def __init__(self):
+        self._users: Dict[str, User] = {}
+
+    def add(self, user: User) -> None:
+        """Adds a user."""
+        self._users[user.id] = user
+
+    def get(self, user_id: str) -> User:
+        """Returns a user based on their ID."""
+        return self._users[user_id]
+
+    def delete(self, user_id: str) -> None:
+        """Deletes a user."""
+        del self._users[user_id]
+
+    def list_all(self) -> List[User]:
+        """Returns all users."""
+        return list(self._users.values())
\ No newline at end of file
diff --git a/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/utils.py b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/utils.py
new file mode 100644
index 0000000..5ca8309
--- /dev/null
+++ b/tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case03/project/src/user_management/utils.py
@@ -0,0 +1,16 @@
+import re
+
+
+def is_valid_email(email: str) -> bool:
+    """
+    Checks whether an email address is valid.
+    """
+    pattern = r"^[\w\.-]+@[\w\.-]+\.\w+$"
+    return re.match(pattern, email) is not None
+
+
+def normalize_name(name: str) -> str:
+    """
+    Removes extra spaces and formats the name.
+    """
+    return " ".join(name.strip().split()).title()
\ No newline at end of file