diff --git a/tests/unit/core/python/_core/test_PythonDefinitionDocumentationGenerator.py b/tests/unit/core/python/_core/test_PythonDefinitionDocumentationGenerator.py
index b4ec9b5..4f44a6c 100644
--- a/tests/unit/core/python/_core/test_PythonDefinitionDocumentationGenerator.py
+++ b/tests/unit/core/python/_core/test_PythonDefinitionDocumentationGenerator.py
@@ -131,7 +131,7 @@ def _signature_section(signature: str) -> str:
                     [],
                 ),
             ),
-            "a(a = '42') -> str",
+            "a(a='42') -> str",
         ),
         (
             PythonDefinitionDocumentationGenerator(
@@ -249,6 +249,46 @@ def _signature_section(signature: str) -> str:
                 'allow_html: bool = True, level: int = 1) -> None'
             ),
         ),
+        (
+            PythonDefinitionDocumentationGenerator(
+                PythonFunctionDefinition(
+                    '__init__',
+                    [
+                        PythonFunctionArgument(
+                            'self',
+                            PythonArgumentKind.NORMAL,
+                            None,
+                            None,
+                        ),
+                        PythonFunctionArgument(
+                            'definition',
+                            PythonArgumentKind.NORMAL,
+                            None,
+                            'PythonDefinition',
+                        ),
+                        PythonFunctionArgument(
+                            'allow_html',
+                            PythonArgumentKind.KEYWORD_ONLY,
+                            'True',
+                            'bool',
+                        ),
+                        PythonFunctionArgument(
+                            'level',
+                            PythonArgumentKind.KEYWORD_ONLY,
+                            '1',
+                            None,
+                        ),
+                    ],
+                    'None',
+                    None,
+                    [],
+                ),
+            ),
+            (
+                '__init__(self, definition: PythonDefinition, *, '
+                'allow_html: bool = True, level=1) -> None'
+            ),
+        ),
     ],
 )
 def test_PythonDefinitionDocumentationGenerator_generate_signature(
@@ -371,7 +411,7 @@ def test_PythonDefinitionDocumentationGenerator_generate_signature_exceptions(
                     [],
                 ),
             ),
-            "a(a = '42') -> str",
+            "a(a='42') -> str",
         ),
         (
             PythonDefinitionDocumentationGenerator(
@@ -1796,7 +1836,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -1938,7 +1978,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2081,7 +2121,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2191,7 +2231,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2301,7 +2341,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2446,7 +2486,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2592,7 +2632,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
@@ -2705,7 +2745,7 @@ Very long ...
 ## Function signature
 
 ```python
-a(hello: int, /, world = 1, *, something: str = 'something', **value) -> bool
+a(hello: int, /, world=1, *, something: str = 'something', **value) -> bool
 ```
 
 ## Returns
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
index c95a23a..113810a 100644
--- 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
@@ -6,4 +6,34 @@
 
 ```python
 func()
-```
\ No newline at end of file
+```
+
+## Function `func2`
+
+### Function signature
+
+```python
+func2(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `a` | `int` | normal | -- | -- |
+| `b` | `int` | normal | `42` | -- |
+| `c` | `int` | normal | `42` | -- |
+| `d` | -- | normal | `42` | -- |
+
+
+
+
+
+
+
+### Docstring
+
+:param c:
+:type c: int
\ 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
index 30a3b59..1af50fe 100644
--- 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
@@ -1 +1,8 @@
 def func(): ...
+
+
+def func2(a: int, b: int = 42, c=42, d=42):
+    """
+    :param c:
+    :type c: int
+    """
diff --git a/tests/unit/core/python/_core/test_PythonModuleDocumentationGenerator.py b/tests/unit/core/python/_core/test_PythonModuleDocumentationGenerator.py
index d922136..c601d26 100644
--- a/tests/unit/core/python/_core/test_PythonModuleDocumentationGenerator.py
+++ b/tests/unit/core/python/_core/test_PythonModuleDocumentationGenerator.py
@@ -241,6 +241,36 @@ def test_PythonModuleDocumentationGenerator_exceptions(
 
 A test module.
 
+## Function `fn`
+
+### Function signature
+
+```python
+fn(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `a` | `int` | normal | -- | -- |
+| `b` | `int` | normal | `42` | -- |
+| `c` | `int` | normal | `42` | -- |
+| `d` | -- | normal | `42` | -- |
+
+
+
+
+
+
+
+### Docstring
+
+:param c:
+:type c: int
+
 ## Function `add`
 
 Adds two numbers.
@@ -422,6 +452,36 @@ A dog.""",
 
 A test module.
 
+## Function `fn`
+
+### Function signature
+
+```python
+fn(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `a` | `int` | normal | -- | -- |
+| `b` | `int` | normal | `42` | -- |
+| `c` | `int` | normal | `42` | -- |
+| `d` | -- | normal | `42` | -- |
+
+
+
+
+
+
+
+### Docstring
+
+:param c:
+:type c: int
+
 ## Function `add`
 
 Adds two numbers.
@@ -604,6 +664,35 @@ A dog.""",
 
 A test module.
 
+## Function `fn`
+
+### Function signature
+
+```python
+fn(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+| Parameter | Type | Kind | Default value | Description |
+| --- | --- | --- | --- | --- |
+| `a` | `int` | normal | -- | -- |
+| `b` | `int` | normal | `42` | -- |
+| `c` | `int` | normal | `42` | -- |
+| `d` | -- | normal | `42` | -- |
+
+
+
+
+
+
+
+<details><summary><h3 style="display:inline">Docstring</h3></summary>"""
+                """:param c:
+:type c: int</details>
+
 ## Function `add`
 
 Adds two numbers.
@@ -782,6 +871,68 @@ Return type: `None`
 
 A test module.
 
+## Function `fn`
+
+### Function signature
+
+```python
+fn(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+- Parameter: `a`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: --
+
+  Description: --
+
+- Parameter: `b`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+- Parameter: `c`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+- Parameter: `d`
+
+  Type: --
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+
+
+
+
+
+
+<details><summary><h3 style="display:inline">Docstring</h3></summary>"""
+                """:param c:
+:type c: int</details>
+
 ## Function `add`
 
 Adds two numbers.
@@ -1001,6 +1152,69 @@ Return type: `None`
 
 A test module.
 
+## Function `fn`
+
+### Function signature
+
+```python
+fn(a: int, b: int = 42, c=42, d=42)
+```
+
+
+
+### Parameters
+
+- Parameter: `a`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: --
+
+  Description: --
+
+- Parameter: `b`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+- Parameter: `c`
+
+  Type: `int`
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+- Parameter: `d`
+
+  Type: --
+
+  Kind: normal
+
+  Default value: `42`
+
+  Description: --
+
+
+
+
+
+
+
+### Docstring
+
+:param c:
+:type c: int
+
 ## Function `add`
 
 Adds two numbers.
diff --git a/tests/unit/core/python/_core/test__signature_argument_list.py b/tests/unit/core/python/_core/test__signature_argument_list.py
index b381864..0297b18 100644
--- a/tests/unit/core/python/_core/test__signature_argument_list.py
+++ b/tests/unit/core/python/_core/test__signature_argument_list.py
@@ -341,6 +341,17 @@ from src.jcloud_docsgen.core.python.arguments import (
             ],
             ['a: int = 1'],
         ),
+        (
+            [
+                PythonFunctionArgument(
+                    'a',
+                    PythonArgumentKind.NORMAL,
+                    '1',
+                    None,
+                ),
+            ],
+            ['a=1'],
+        ),
     ],
 )
 def test__signature_argument_list(argument_list, expected):
diff --git a/tests/unit/core/python/_core/test_project_dirs/pdir_2/src/pkg/module.py b/tests/unit/core/python/_core/test_project_dirs/pdir_2/src/pkg/module.py
index 7da0ee4..91ee326 100644
--- a/tests/unit/core/python/_core/test_project_dirs/pdir_2/src/pkg/module.py
+++ b/tests/unit/core/python/_core/test_project_dirs/pdir_2/src/pkg/module.py
@@ -3,6 +3,13 @@ A test module.
 """
 
 
+def fn(a: int, b: int = 42, c=42, d=42):
+    """
+    :param c:
+    :type c: int
+    """
+
+
 def add(a: int | float, b: int | float) -> int | float:
     """
     Adds two numbers.
diff --git a/tests/unit/core/python/arguments/test_PythonASTArgumentsListParser.py b/tests/unit/core/python/arguments/test_PythonASTArgumentsListParser.py
index 7af0d65..f6a00ec 100644
--- a/tests/unit/core/python/arguments/test_PythonASTArgumentsListParser.py
+++ b/tests/unit/core/python/arguments/test_PythonASTArgumentsListParser.py
@@ -685,7 +685,7 @@ def argument_list(argument_list: str) -> ast.arguments:
         ),
         (
             argument_list(
-                "a = 1, b = 'a', /, *args, c = None, d = True, **kwargs",
+                "a=1, b='a', /, *args, c=None, d=True, **kwargs",
             ),
             [
                 PythonFunctionArgument(
@@ -727,9 +727,7 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list(
-                "a, b = 'a', /, *args, c = None, d = True, **kwargs"
-            ),
+            argument_list("a, b='a', /, *args, c=None, d=True, **kwargs"),
             [
                 PythonFunctionArgument(
                     'a',
@@ -767,7 +765,7 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list('a, b , /, *args, c = None, d = True, **kwargs'),
+            argument_list('a, b , /, *args, c=None, d=True, **kwargs'),
             [
                 PythonFunctionArgument(
                     'a',
@@ -808,7 +806,7 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list('a, b , /, *args, c, d = True, **kwargs'),
+            argument_list('a, b , /, *args, c, d=True, **kwargs'),
             [
                 PythonFunctionArgument(
                     'a',
@@ -890,7 +888,7 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list('a, b , /, *args, c = None, d, **kwargs'),
+            argument_list('a, b , /, *args, c=None, d, **kwargs'),
             [
                 PythonFunctionArgument(
                     'a',
@@ -931,7 +929,7 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list('a = 1'),
+            argument_list('a=1'),
             [
                 PythonFunctionArgument(
                     'a',
diff --git a/tests/unit/core/python/arguments/test_PythonFunctionArgument.py b/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
index 0652165..52014e0 100644
--- a/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
+++ b/tests/unit/core/python/arguments/test_PythonFunctionArgument.py
@@ -362,7 +362,7 @@ from src.jcloud_docsgen.exceptions import (
             '1',
             None,
             PythonArgumentStructureError,
-            '* or ** arguments cannot have default values: *a = 1',
+            '* or ** arguments cannot have default values: *a=1',
         ),
         (
             'a',
@@ -370,7 +370,7 @@ from src.jcloud_docsgen.exceptions import (
             '1',
             None,
             PythonArgumentStructureError,
-            '* or ** arguments cannot have default values: **a = 1',
+            '* or ** arguments cannot have default values: **a=1',
         ),
     ],
 )
@@ -498,7 +498,7 @@ def test_PythonFunctionArgument_asterik(name, kind, annotation):
                 '1',
                 None,
             ),
-            'a = 1',
+            'a=1',
         ),
         (
             PythonFunctionArgument(
@@ -531,7 +531,7 @@ def test_PythonFunctionArgument_asterik(name, kind, annotation):
                 '1',
                 None,
             ),
-            'a = 1',
+            'a=1',
         ),
         (
             PythonFunctionArgument(
@@ -567,7 +567,7 @@ def test_PythonFunctionArgument_asterik(name, kind, annotation):
                 '1',
                 None,
             ),
-            'a = 1',
+            'a=1',
         ),
         (
             PythonFunctionArgument(