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- scripts/docstring_generator.py: CLI tool that detects functions missing docstrings and generates Google-style docstrings from function signature and body. Supports --dry-run, --json, -v flags. Inserts docstrings in place using AST. - tests/test_docstring_generator.py: Unit tests (14 tests, all pass) covering core logic. Detects 129 undocumented functions across 27 files; can process 20+ per run. Closes #96
129 lines
4.0 KiB
Python
129 lines
4.0 KiB
Python
"""Tests for docstring_generator module (Issue #96)."""
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import ast
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import sys
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import tempfile
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from pathlib import Path
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import pytest
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sys.path.insert(0, str(Path(__file__).parent.parent / "scripts"))
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from docstring_generator import (
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name_to_title,
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extract_body_hint,
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generate_docstring,
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process_source,
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iter_python_files,
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)
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class TestNameToTitle:
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def test_snake_to_title(self):
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assert name_to_title("validate_fact") == "Validate Fact"
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assert name_to_title("docstring_generator") == "Docstring Generator"
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assert name_to_title("main") == "Main"
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assert name_to_title("__init__") == "Init"
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class TestExtractBodyHint:
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def test_assignment_hint(self):
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body = [ast.parse("result = compute()").body[0]]
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hint = extract_body_hint(body)
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assert hint == "Compute or return compute()"
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def test_return_hint(self):
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body = [ast.parse("return data").body[0]]
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hint = extract_body_hint(body)
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assert hint == "Return data"
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def test_no_hint(self):
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body = [ast.parse("pass").body[0]]
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assert extract_body_hint(body) is None
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class TestGenerateDocstring:
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def test_simple_function(self):
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src = "def add(a, b):\n return a + b\n"
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tree = ast.parse(src)
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func = tree.body[0]
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doc = generate_docstring(func)
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assert 'Add' in doc
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assert 'a' in doc and 'b' in doc
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assert 'Args:' in doc
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assert 'Returns:' in doc
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def test_typed_function(self):
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src = "def greet(name: str) -> str:\n return f'Hello {name}'\n"
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tree = ast.parse(src)
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func = tree.body[0]
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doc = generate_docstring(func)
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assert 'name (str)' in doc
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assert 'str' in doc
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def test_async_function(self):
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src = "async def fetch():\n pass\n"
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tree = ast.parse(src)
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func = tree.body[0]
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doc = generate_docstring(func)
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assert 'Fetch' in doc
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def test_self_skipped(self):
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src = "class C:\n def method(self, x):\n return x\n"
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tree = ast.parse(src)
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cls = tree.body[0]
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method = cls.body[0]
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doc = generate_docstring(method)
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# 'self' should not appear in Args section
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args_start = doc.find('Args:')
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if args_start >= 0:
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args_section = doc[args_start:]
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assert '(self)' not in args_section
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class TestProcessSource:
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def test_adds_docstrings(self):
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src = "def foo(x):\n return x * 2\n"
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new_src, funcs = process_source(src, "test.py")
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assert len(funcs) == 1 and funcs[0] == "foo"
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assert '"""' in new_src
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assert 'Foo' in new_src
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def test_preserves_existing_docstrings(self):
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src = 'def bar():\n """Already documented."""\n return 1\n'
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new_src, funcs = process_source(src, "test.py")
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assert len(funcs) == 0
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assert new_src == src
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def test_multiple_functions(self):
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src = "def a(): pass\ndef b(): pass\ndef c(): pass\n"
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new_src, funcs = process_source(src, "test.py")
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assert len(funcs) == 3
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assert '"""' in new_src
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def test_dry_run_no_write(self, tmp_path):
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file = tmp_path / "t.py"
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file.write_text("def f(): pass\n")
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original_mtime = file.stat().st_mtime
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new_src, funcs = process_source(file.read_text(), str(file))
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assert funcs # detected
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# When caller handles write, dry-run leaves file unchanged
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current_mtime = file.stat().st_mtime
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assert current_mtime == original_mtime
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class TestIterPythonFiles:
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def test_single_file(self, tmp_path):
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f = tmp_path / "single.py"
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f.write_text("x = 1")
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files = iter_python_files([str(f)])
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assert len(files) == 1
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assert files[0].name == "single.py"
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def test_directory_recursion(self, tmp_path):
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(tmp_path / "sub").mkdir()
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(tmp_path / "sub" / "a.py").write_text("a=1")
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(tmp_path / "b.py").write_text("b=2")
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files = iter_python_files([str(tmp_path)])
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assert len(files) == 2
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