diff --git a/tests/enum_completion.cpp b/tests/enum_completion.cpp
index 29f23a7..c6b31d8 100644
--- a/tests/enum_completion.cpp
+++ b/tests/enum_completion.cpp
@@ -8,6 +8,7 @@
  */
 
 #include "trompeloeil_doctest.h"
+#include "datastoreaccess_mock.hpp"
 #include "parser.hpp"
 #include "pretty_printers.hpp"
 #include "static_schema.hpp"
@@ -22,7 +23,16 @@
     schema->addList("/", "mod:list", {"number"});
     schema->addLeaf("/mod:list", "mod:number", yang::LeafDataTypes::Int32);
     schema->addLeafEnum("/mod:list", "mod:leafInList", {"ano", "anoda", "ne", "katoda"});
-    Parser parser(schema);
+    auto mockDatastore = std::make_shared<MockDatastoreAccess>();
+    // The parser will use DataQuery for key value completion, but I'm not testing that here, so I don't return anything.
+    ALLOW_CALL(*mockDatastore, listInstances("/mod:list"))
+        .RETURN(std::vector<ListInstance>{});
+
+    // DataQuery gets the schema from DatastoreAccess once
+    auto expectation = NAMED_REQUIRE_CALL(*mockDatastore, schema())
+        .RETURN(schema);
+    auto dataQuery = std::make_shared<DataQuery>(*mockDatastore);
+    Parser parser(schema, dataQuery);
     std::string input;
     std::ostringstream errorStream;