1 files changed, 5 insertions, 0 deletions
diff --git a/coverage/data.py b/coverage/data.py
index 3250196d..3a2432b3 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -445,6 +445,11 @@ class CoverageJsonData(object):
 
         self._validate()
 
+    def set_context(self, context):
+        """Set the context. Not implemented for JSON storage."""
+        if context:
+            raise CoverageException("JSON storage doesn't support contexts")
+
     def write(self):
         """Write the collected coverage data to a file.