Try to set up coverage

Author: rhpvorderman

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+plugins = Cython.Coverage

setup.py

@@ -23,13 +23,18 @@
 
 from setuptools import Extension, find_packages, setup
 
-EXTENSION_OPTS = {}
+EXTENSION_OPTS = dict(compiler_directives={})
 
 # Make sure conda prefix is loaded if installed in a conda environment.
 CONDA_PREFIX = os.environ.get("CONDA_PREFIX")
 if CONDA_PREFIX:
     EXTENSION_OPTS["include_dirs"] = [os.path.join(CONDA_PREFIX, "include")]
 
+CYTHON_COVERAGE=os.environ.get("CYTHON_COVERAGE", False)
+if CYTHON_COVERAGE:
+    EXTENSION_OPTS["compiler_directives"]["linetrace"] = True
+    EXTENSION_OPTS["define_macros"] = [("CYTHON_TRACE", 1)]
+
 setup(
     name="isal",
     version="0.1.0-dev",
@@ -45,7 +50,7 @@
     zip_safe=False,
     packages=find_packages('src'),
     package_dir={'': 'src'},
-    package_data={'isal': ['*.pxd']},
+    package_data={'isal': ['*.pxd', '*.pyx']},
     url="https://github.com/rhpvorderman/python-isal",
     classifiers=[
         "Programming Language :: Python :: 3 :: Only",

src/isal/isal_zlib.pyx

@@ -20,6 +20,7 @@
 
 # cython: language_level=3
 
+
 import warnings
 import zlib
 

tox.ini

@@ -3,13 +3,20 @@
 # python3 interpreter of the user.
 envlist=py3
 [testenv]
+setenv=
+    CYTHON_COVERAGE=True
 deps=coverage
      pytest
+     cython
+allowlist_externals=
+    cp
 commands =
     # Create HTML coverage report for humans and xml coverage report for external services.
-    coverage run --source=isal -m py.test -v tests
+    coverage run --source={envsitepackagesdir}/isal -m py.test -v tests
     coverage html
     coverage xml
+    cython  --annotate-coverage coverage.xml  {envsitepackagesdir}/isal/isal_zlib.pyx
+    cp {envsitepackagesdir}/isal/isal_zlib.html htmlcov/
 
 [testenv:lint]
 deps=flake8