add test to make sure a destination is set

... for an UploadSet

modified:   CHANGES.rst
modified:   tests/test_flask_reuploaded.py
modified:   tox.ini

CHANGES.rst

@@ -3,7 +3,7 @@ Changelog
 
 unreleased
 ----------
-- nothing yet
+- improve coverage
 
 
 0.5.0

tests/test_flask_reuploaded.py

@@ -17,6 +17,7 @@
 from flask_uploads import UploadNotAllowed
 from flask_uploads import UploadSet
 from flask_uploads import addslash
+from flask_uploads import config_for_set
 from flask_uploads import configure_uploads
 from flask_uploads import extension
 from flask_uploads import lowercase_ext
@@ -355,3 +356,11 @@ def test_url_based(self):
             url = uset.url('foo.txt')
             assert url == 'http://localhost:5001/foo.txt'
         assert '_uploads' not in app.blueprints
+
+
+def test_configure_for_set_throws_runtimeerror():
+    """when there is no destination for an UploadSet"""
+    upload_set = UploadSet("files")
+    app = Flask(__name__)
+    with pytest.raises(RuntimeError):
+        config_for_set(upload_set, app)

tox.ini

@@ -10,6 +10,7 @@ envlist =
 
 [testenv]
 extras = test
+deps = pdbpp
 commands = pytest {posargs}
 
 [testenv:coverage]