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-rw-r--r--coverage/data.py4
-rw-r--r--tests/test_data.py2
2 files changed, 3 insertions, 3 deletions
diff --git a/coverage/data.py b/coverage/data.py
index adacaecc..be34da1b 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -147,10 +147,10 @@ class CoverageData(object):
# Create the file data.
file_data = {}
- file_data['lines'] = dict((f, list(lmap.keys())) for f, lmap in iitems(self._lines))
-
if self._arcs:
file_data['arcs'] = dict((f, list(amap.keys())) for f, amap in iitems(self._arcs))
+ else:
+ file_data['lines'] = dict((f, list(lmap.keys())) for f, lmap in iitems(self._lines))
if self._collector:
file_data['collector'] = self._collector
diff --git a/tests/test_data.py b/tests/test_data.py
index 734c3423..6278e36a 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -174,7 +174,7 @@ class DataFilesTest(DataTestHelpers, CoverageTest):
with open(".coverage", 'rb') as fdata:
data = pickle.load(fdata)
- self.assertCountEqual(data['lines'].keys(), [])
+ self.assertNotIn('lines', data)
arcs = data['arcs']
self.assertCountEqual(arcs['x.py'], X_PY_ARCS_3)
self.assertCountEqual(arcs['y.py'], Y_PY_ARCS_3)