fix various packaging issues

.gitignore

@@ -43,3 +43,5 @@ coverage.xml
 
 # Sphinx documentation
 docs/_build/
+
+all_expr_*.py

setup.cfg

@@ -35,6 +35,7 @@ zip_safe = True
 include_package_data = True
 packages = find:
 python_requires = >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
+tests_require = astunparse
 
 [options.packages.find]
 exclude = tests

tests/check_astunparse.py

@@ -5,7 +5,7 @@ try:
 except ImportError:
     import unittest
 
-import test_code_gen
+from . import test_code_gen
 
 import astunparse
 

tests/check_expressions.py

@@ -33,7 +33,7 @@ except ImportError:
         import all_expr_2_6 as mymod
     except ImportError:
         print("Expression list does not exist -- building")
-        import build_expressions
+        from . import build_expressions
         build_expressions.makelib()
         print("Expression list built")
         import all_expr_2_6 as mymod
@@ -44,7 +44,7 @@ else:
         mymod = importlib.import_module(mymodname)
     except ImportError:
         print("Expression list does not exist -- building")
-        import build_expressions
+        from . import build_expressions
         build_expressions.makelib()
         print("Expression list built")
         mymod = importlib.import_module(mymodname)