Merge fb8747e into 23610d4

.coveragerc

@@ -11,6 +11,7 @@ omit =
     cf_units/etc/*
     cf_units/tests/*
     .eggs
+plugins = Cython.Coverage
 
 
 [report]

.travis.yml

@@ -25,16 +25,18 @@ install:
   - conda create --name $ENV_NAME python=$TRAVIS_PYTHON_VERSION udunits2 --file requirements.txt --file requirements-dev.txt
   - source activate $ENV_NAME
 
+  # Enable coverage of cython.
+  - export CYTHON_COVERAGE=1
+
   # Output debug info.
   - conda list
   - conda info -a
 
-  # cf_units.
+  # Install cf_units.
   - PREFIX=$HOME/miniconda/envs/$ENV_NAME
-
   - pip install -e .
 
 script:
-  - coverage run -m pytest cf_units cf_units
+    - pytest --pyargs --cov
 
 after_success: coveralls

setup.py

@@ -45,6 +45,11 @@ def read(*parts):
     extra_extension_args = dict(
         runtime_library_dirs=library_dirs)
 
+# Enable cython coverage
+cython_coverage_enabled = os.environ.get('CYTHON_COVERAGE', None)
+if cython_coverage_enabled:
+    extra_extension_args.update({'define_macros': [('CYTHON_TRACE_NOGIL', '1')]})
+
 ext = 'pyx' if cythonize else 'c'
 
 udunits_ext = Extension('cf_units._udunits2',
@@ -55,7 +60,7 @@ def read(*parts):
                         **extra_extension_args)
 
 if cythonize:
-    [udunits_ext] = cythonize(udunits_ext)
+    [udunits_ext] = cythonize(udunits_ext, compiler_directives={'linetrace': True})
 
 cmdclass = {}
 cmdclass.update(versioneer.get_cmdclass())