Fix test_bigquery_graph_missing_spanner_deps.

The mock query result must contain valid json so that the visualizer attempts to get launched, in order for the code path we're trying to test to get reached.

Author: ericfe-google

tests/unit/test_bigquery.py

@@ -949,7 +949,18 @@ def test_bigquery_graph_missing_spanner_deps(monkeypatch):
         "google.cloud.bigquery_storage.BigQueryReadClient", bqstorage_mock
     )
     sql = "SELECT graph_json FROM t"
-    result = pandas.DataFrame([], columns=["graph_json"])
+    graph_json_rows = [
+        """
+        [{"identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQI=","kind":"node","labels":["Person"],"properties":{"birthday":"1991-12-21T08:00:00Z","city":"Adelaide","country":"Australia","id":1,"name":"Alex"}},{"destination_node_identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEO","identifier":"mUZpbkdyYXBoLlBlcnNvbk93bkFjY291bnQAeJECkQ6ZRmluR3JhcGguUGVyc29uAHiRAplGaW5HcmFwaC5BY2NvdW50AHiRDg==","kind":"edge","labels":["Owns"],"properties":{"account_id":7,"create_time":"2020-01-10T14:22:20.222Z","id":1},"source_node_identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQI="},{"identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEO","kind":"node","labels":["Account"],"properties":{"create_time":"2020-01-10T14:22:20.222Z","id":7,"is_blocked":false,"nick_name":"Vacation Fund"}}]
+        """,
+        """
+        [{"identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQY=","kind":"node","labels":["Person"],"properties":{"birthday":"1986-12-07T08:00:00Z","city":"Kollam","country":"India","id":3,"name":"Lee"}},{"destination_node_identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEg","identifier":"mUZpbkdyYXBoLlBlcnNvbk93bkFjY291bnQAeJEGkSCZRmluR3JhcGguUGVyc29uAHiRBplGaW5HcmFwaC5BY2NvdW50AHiRIA==","kind":"edge","labels":["Owns"],"properties":{"account_id":16,"create_time":"2020-02-18T13:44:20.655Z","id":3},"source_node_identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQY="},{"identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEg","kind":"node","labels":["Account"],"properties":{"create_time":"2020-01-28T01:55:09.206Z","id":16,"is_blocked":true,"nick_name":"Vacation Fund"}}]
+        """,
+        """
+        [{"identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQQ=","kind":"node","labels":["Person"],"properties":{"birthday":"1980-10-31T08:00:00Z","city":"Moravia","country":"Czech_Republic","id":2,"name":"Dana"}},{"destination_node_identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEo","identifier":"mUZpbkdyYXBoLlBlcnNvbk93bkFjY291bnQAeJEEkSiZRmluR3JhcGguUGVyc29uAHiRBJlGaW5HcmFwaC5BY2NvdW50AHiRKA==","kind":"edge","labels":["Owns"],"properties":{"account_id":20,"create_time":"2020-01-28T01:55:09.206Z","id":2},"source_node_identifier":"mUZpbkdyYXBoLlBlcnNvbgB4kQQ="},{"identifier":"mUZpbkdyYXBoLkFjY291bnQAeJEo","kind":"node","labels":["Account"],"properties":{"create_time":"2020-02-18T13:44:20.655Z","id":20,"is_blocked":false,"nick_name":"Rainy Day Fund"}}]
+        """,
+    ]
+    result = pandas.DataFrame(graph_json_rows, columns=["graph_json"])
     run_query_patch = mock.patch("bigquery_magics.bigquery._run_query", autospec=True)
     display_patch = mock.patch("IPython.display.display", autospec=True)
     query_job_mock = mock.create_autospec(