Fix import errors with ``python -m unittest``.

Running standard unittest on the test suite resulted in 89 ImportErrors
because ``import DocutilsTestSupport was used to set up sys.path()
but the module could not be found on the original sys.path().

git-svn-id: https://svn.code.sf.net/p/docutils/code/trunk@9274 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

1 files changed, 6 insertions, 0 deletions

diff --git a/docutils/test/test_functional.py b/docutils/test/test_functional.py
index 17a81bb50..d1a1d5f17 100755
--- a/docutils/test/test_functional.py
+++ b/docutils/test/test_functional.py
@@ -13,8 +13,14 @@ __ ../../docs/dev/testing.html#functional
 
 from pathlib import Path
 import shutil
+import sys
 import unittest
 
+if __name__ == '__main__':
+    # prepend the "docutils root" to the Python library path
+    # so we import the local `docutils` package.
+    sys.path.insert(0, str(Path(__file__).parents[1]))
+
 from docutils import core, SettingsSpec
 
 FUNCTIONAL = Path('functional')