Implements JsonReader (#2)

bonobo/util/testing.py

@@ -0,0 +1,9 @@
+from unittest.mock import MagicMock
+
+from bonobo.core.contexts import ComponentExecutionContext
+
+
+class CapturingComponentExecutionContext(ComponentExecutionContext):
+    def __init__(self, component, parent):
+        super().__init__(component, parent)
+        self.send = MagicMock()