Add tests for bundlebuilder

Makefile.am

@@ -1,6 +1,9 @@
 ACLOCAL_AMFLAGS = -I m4
 DISTCHECK_CONFIGURE_FLAGS = --enable-introspection
 
+TESTS_TMPDIR=$(abs_builddir)/tests-tmp
+TESTS_PYTHONPATH=$(abs_srcdir)/src:$(PYTHONPATH)
+
 DISTCLEANFILES =		\
 	intltool-extract	\
 	intltool-merge		\
@@ -17,4 +20,7 @@ check: test
 
 test:
 	cd $(top_srcdir)/tests && \
-	python -m unittest discover
+    mkdir -p $(TESTS_TMPDIR) && \
+    TMPDIR=$(TESTS_TMPDIR) PYTHONPATH=$(TESTS_PYTHONPATH) \
+    python -m unittest discover && \
+    rm -rf $(TESTS_TMPDIR)