Merge in latest from datadog/dd-trace-py (#1)

conftest.py

@@ -0,0 +1,55 @@
+"""
+This file configures a local pytest plugin, which allows us to configure plugin hooks to control the
+execution of our tests. Either by loading in fixtures, configuring directories to ignore, etc
+
+Local plugins: https://docs.pytest.org/en/3.10.1/writing_plugins.html#local-conftest-plugins
+Hook reference: https://docs.pytest.org/en/3.10.1/reference.html#hook-reference
+"""
+import os
+import re
+import sys
+
+import pytest
+
+PY_DIR_PATTERN = re.compile(r"^py[23][0-9]$")
+
+
+# Determine if the folder should be ignored
+# https://docs.pytest.org/en/3.10.1/reference.html#_pytest.hookspec.pytest_ignore_collect
+# DEV: We can only ignore folders/modules, we cannot ignore individual files
+# DEV: We must wrap with `@pytest.mark.hookwrapper` to inherit from default (e.g. honor `--ignore`)
+#      https://github.com/pytest-dev/pytest/issues/846#issuecomment-122129189
+@pytest.mark.hookwrapper
+def pytest_ignore_collect(path, config):
+    """
+    Skip directories defining a required minimum Python version
+
+    Example::
+
+        File: tests/contrib/vertica/py35/test.py
+        Python 2.7: Skip
+        Python 3.4: Skip
+        Python 3.5: Collect
+        Python 3.6: Collect
+    """
+    # Execute original behavior first
+    # DEV: We need to set `outcome.force_result(True)` if we need to override
+    #      these results and skip this directory
+    outcome = yield
+
+    # Was not ignored by default behavior
+    if not outcome.get_result():
+        # DEV: `path` is a `LocalPath`
+        path = str(path)
+        if not os.path.isdir(path):
+            path = os.path.dirname(path)
+        dirname = os.path.basename(path)
+
+        # Directory name match `py[23][0-9]`
+        if PY_DIR_PATTERN.match(dirname):
+            # Split out version numbers into a tuple: `py35` -> `(3, 5)`
+            min_required = tuple((int(v) for v in dirname.strip("py")))
+
+            # If the current Python version does not meet the minimum required, skip this directory
+            if sys.version_info[0:2] < min_required:
+                outcome.force_result(True)