Add py.test wizardry for running a subset of file tests. Fixes #134.

1 files changed, 36 insertions, 0 deletions

diff --git a/scss/tests/conftest.py b/scss/tests/conftest.py
new file mode 100644
index 0000000..9a3b73b
--- /dev/null
+++ b/scss/tests/conftest.py
@@ -0,0 +1,36 @@
+"""py.test plugin configuration."""
+
+import glob
+import os.path
+import re
+
+FILES_DIR = os.path.join(os.path.dirname(__file__), 'files')
+
+def pytest_generate_tests(metafunc):
+    """Inject the test files as parametrizations.
+
+    Relies on the command-line option `--test-file-filter`, set by the root
+    conftest.py.
+    """
+
+    scss_files = glob.glob(os.path.join(FILES_DIR, '*/*.scss'))
+    test_file_filter = metafunc.config.getoption('test_file_filter')
+    if test_file_filter:
+        file_filters = [
+            re.compile(filt)
+            for filt in test_file_filter.split(',')
+        ]
+
+        filtered_scss_files = []
+        for fn in scss_files:
+            relfn = os.path.relpath(fn, FILES_DIR)
+            for rx in file_filters:
+                if rx.search(relfn):
+                    filtered_scss_files.append(fn)
+                    break
+
+        scss_files = filtered_scss_files
+
+    metafunc.parametrize(
+        'scss_file_pair',
+        [(fn, fn[:-5] + '.css') for fn in scss_files])