CI: fix failing script/tests

Makefile

@@ -1,4 +1,4 @@
-.PHONY : develop build clean clean_pyc doc lint-diff black
+.PHONY : develop build clean clean_pyc doc lint-diff black test-scripts
 
 all: develop
 
@@ -25,3 +25,6 @@ doc:
 	cd doc; \
 	python make.py clean; \
 	python make.py html
+
+test-scripts:
+	pytest scripts

scripts/tests/test_inconsistent_namespace_check.py

@@ -1,6 +1,6 @@
 import pytest
 
-from scripts.check_for_inconsistent_pandas_namespace import (
+from ..check_for_inconsistent_pandas_namespace import (
     check_for_inconsistent_pandas_namespace,
 )
 

scripts/tests/test_validate_docstrings.py

@@ -2,7 +2,8 @@
 import textwrap
 
 import pytest
-import validate_docstrings
+
+from .. import validate_docstrings
 
 
 class BadDocstrings:
@@ -162,7 +163,9 @@ def test_bad_class(self, capsys):
             (
                 "BadDocstrings",
                 "indentation_is_not_a_multiple_of_four",
-                ("flake8 error: E111 indentation is not a multiple of four",),
+                # with flake8 3.9.0, the message ends with four spaces,
+                #  whereas in earlier versions, it ended with "four"
+                ("flake8 error: E111 indentation is not a multiple of     ",),
             ),
             (
                 "BadDocstrings",

scripts/tests/test_validate_unwanted_patterns.py

@@ -1,7 +1,8 @@
 import io
 
 import pytest
-import validate_unwanted_patterns
+
+from .. import validate_unwanted_patterns
 
 
 class TestBarePytestRaises: