add test dependency

.moban.d/tests/requirements.txt

@@ -1,5 +1,6 @@
 {% extends 'tests/requirements.txt.jj2' %}
 {%block extras %}
+psutil
 pyexcel
 pyexcel-xls
 {%endblock%}

tests/requirements.txt

@@ -3,5 +3,6 @@ mock;python_version<"3"
 codecov
 coverage
 flake8
+psutil
 pyexcel
 pyexcel-xls

tests/test_writer.py

@@ -19,10 +19,10 @@ class TestNativeODSWriter:
         reader = Reader()
         reader.open(self.testfile)
         content = reader.read_all()
-        reader.close()
         for key in content.keys():
             content[key] = list(content[key])
         assert content == self.content
+        reader.close()
 
     def tearDown(self):
         if os.path.exists(self.testfile):