added tests for requirer

interfaces/grafana_datasource_exchange/v0/interface_tests/test_provider.py

@@ -1,5 +1,3 @@
-import json
-
 from interface_tester import Tester
 from scenario import State, Relation
 

interfaces/grafana_datasource_exchange/v0/interface_tests/test_requirer.py

@@ -1,2 +1,20 @@
-# given that this interface is symmetric, and we expect each provider
-# to also be a requirer, we omit the requirer tests.
+from interface_tester import Tester
+from scenario import State, Relation
+
+
+def test_datasource_exchange():
+    # GIVEN the grafana_datasource interface has shared one or more source UIDs
+    source_exchange = Relation(
+        endpoint='grafana-source-exchange',
+        interface='grafana_datasource_exchange',
+        remote_app_name='bar'
+    )
+    tester = Tester(state_in=State(
+        relations=[
+            source_exchange
+        ]
+    ))
+    # WHEN the requirer processes any relation event
+    tester.run('grafana-source-exchange-relation-changed')
+    # THEN the requirer publishes valid data
+    tester.assert_schema_valid()