Cython project for test coverage

app._api.pyx

cdef int func_1():
    return 1

cdef int func_any():
    return 10


def cy_func(num:int) -> int:
    if num == 1:
        return func_1()
    else:
        return func_any()

app.core.py

def func_1():
    return 1


def func_any():
    return 10


def py_func(num: int) -> int:
    if num == 1:
        return func_1()
    else:
        return func_any()

pyproject.toml

[build-system]
requires = [
    "setuptools>=58.2.0", 
    "wheel", 
    "Cython>=0.29.23", 
    "numpy>=1.23.4", 
]
build-backend = "setuptools.build_meta"

[project]
name = "app"
version = "0.0.1"
description = "..."
readme = "README.md"
requires-python = ">=3.10"

[tool.coverage.run]
plugins = [
    "Cython.Coverage"
]
omit = [
    "*/__init__.py",
    "tests/*",
]
source = [
    "app",
]

[tool.coverage.report]
exclude_lines = [
    "pragma: no cover",
    "def __repr__",
    "def _html_repr_",
    "@(abc\\.)?abstractmethod",
]

[tool.pytest]
testpaths = "tests/"

run.sh

python setup.py build_ext --inplace
coverage run -m pytest
coverage report -m
  
# tests/app_test.py ..                            [100%]

# ================== 2 passed in 0.02s ==================

# Name           Stmts   Miss  Cover   Missing
# --------------------------------------------
# app/_api.pyx       8      2    75%   5, 12
# app/core.py        8      0   100%
# --------------------------------------------
# TOTAL             16      2    88%

setup.py

import os
from setuptools import Extension, setup
from Cython.Build import cythonize

os.environ["TEST"] = "TRUE"
TEST = bool(os.environ.get("TEST", False))

compiler_directives: dict[str, int | bool] = {"language_level": 3}
define_macros: list[tuple[str, str]] = [
    ("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION")
]

if TEST:
    # inorder to compile the cython code for test coverage
    # we need to include the following compiler directives...
    compiler_directives.update({"linetrace": True, "profile": True})
    # and include the following trace macros
    define_macros.extend([("CYTHON_TRACE", "1"), ("CYTHON_TRACE_NOGIL", "1")])

ext_modules = cythonize(
    [
        Extension("app._api", ["app/_api.pyx"], define_macros=define_macros),
    ],
    compiler_directives=compiler_directives,
)

setup(
    ext_modules=ext_modules,
)

tests.app_test.py

from app.core import py_func
from app._api import cy_func



def test_cy():
    assert cy_func(1) == 1
    
def test_py():
    assert py_func(1) == 1
    assert py_func(2) == 10

Thanks!

Thanks!

glad it could help. 🐍