Python: Move tests outside of src directory

Tests shouldn't be shipped with the Python NVTX package.
With this commit, test_profiler.pyx is not included in the wheel
anymore.

More information about test layout: https://docs.pytest.org/en/7.1.x/explanation/goodpractices.html#choosing-a-test-layout-import-rules

.github/workflows/cibw.yml

@@ -65,8 +65,8 @@ jobs:
         CIBW_ARCHS_LINUX: ${{ matrix.cibw_archs_linux }}
         CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
         CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
-        CIBW_TEST_COMMAND: "pytest {package}/nvtx/tests"
-        CIBW_TEST_REQUIRES: "pytest"
+        CIBW_TEST_COMMAND: "pytest {package}/tests"
+        CIBW_TEST_REQUIRES: "pytest Cython"
         CIBW_REPAIR_WHEEL_COMMAND_LINUX: 'auditwheel repair -w {dest_dir} {wheel}'
         CIBW_ENVIRONMENT: "C_INCLUDE_PATH=$(pwd)/c/include"
       with:

python/tests/conftest.py

@@ -0,0 +1,21 @@
+from Cython.Build import cythonize
+from Cython.Build.Cythonize import run_distutils
+from pathlib import Path
+from setuptools.extension import Extension
+
+
+def build_cython():
+    """Compile Cython files inside tests/cython"""
+    tests_dir = Path(__file__).parent
+    cython_dir = tests_dir / 'cython'
+    include_dir = tests_dir.parent.parent / 'c' / 'include'
+    run_distutils((
+        str(cython_dir),
+        cythonize(
+            Extension('*', sources=[str(cython_dir / '*.pyx')], include_dirs=[str(include_dir)]),
+            compiler_directives=dict(language_level=3, embedsignature=True, profile=True))
+    ))
+
+
+def pytest_configure(config):
+    build_cython()

python/tests/test_profiler.py

@@ -0,0 +1,5 @@
+from .cython.test_profiler import test_profiler_message as _test_profiler_message
+
+
+def test_profiler():
+    _test_profiler_message()