Fixed test_max_csv_mb test that I just broke, refs #1063

tests/test_csv.py

@@ -130,8 +130,10 @@ def test_csv_with_non_ascii_characters(app_client):
 
 def test_max_csv_mb(app_client_csv_max_mb_one):
     response = app_client_csv_max_mb_one.get(
-        "/fixtures.csv?sql=select+randomblob(10000)+"
-        "from+compound_three_primary_keys&_stream=1&_size=max"
+        (
+            "/fixtures.csv?sql=select+'{}'+"
+            "from+compound_three_primary_keys&_stream=1&_size=max"
+        ).format("abcdefg" * 10000)
     )
     # It's a 200 because we started streaming before we knew the error
     assert response.status == 200