python: Fix tests on MinGW

Add the directories containing required DLLs with os.add_dll_directory
to make tests work on MinGW.

python/tests/Makefile.am

@@ -21,7 +21,7 @@ check-local: $(TESTSPY)
           fi; \
 	  for test in $(TESTSPY) ; do \
 	    echo "-- $$test" ; \
-	    $(PYTHON) $(srcdir)/$$test; \
+	    LIBXML_SRC="$(LIBXML_SRC)" $(PYTHON) $(srcdir)/$$test; \
 	  done)
 endif
 

python/tests/basic.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 import os
 import sys
+import setup_test
 import libxml2
 # Memory debug specific
 libxml2.debugMemory(1)

python/tests/exslt.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 import sys
+import setup_test
 import libxml2
 # Memory debug specific
 libxml2.debugMemory(1)

python/tests/extelem.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 import sys
 import string
+import setup_test
 import libxml2
 # Memory debug specific
 libxml2.debugMemory(1)

python/tests/extfunc.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 import sys
 import string
+import setup_test
 import libxml2
 # Memory debug specific
 libxml2.debugMemory(1)

python/tests/setup_test.py

@@ -0,0 +1,8 @@
+import os
+
+if hasattr(os, 'add_dll_directory'):
+    os.add_dll_directory(os.path.join(os.getcwd(), '..', '..', 'libxslt', '.libs'))
+    os.add_dll_directory(os.path.join(os.getcwd(), '..', '..', 'libexslt', '.libs'))
+    libxml_src = os.getenv('LIBXML_SRC')
+    if libxml_src is not None and libxml_src != '':
+        os.add_dll_directory(os.path.join(libxml_src, '.libs'))