1 files changed, 38 insertions, 0 deletions

diff --git a/subprojects/store-query-viatra/src/test/java/tools/refinery/store/query/viatra/QueryTest.java b/subprojects/store-query-viatra/src/test/java/tools/refinery/store/query/viatra/QueryTest.java
index 8ecbe11a..8e945731 100644
--- a/subprojects/store-query-viatra/src/test/java/tools/refinery/store/query/viatra/QueryTest.java
+++ b/subprojects/store-query-viatra/src/test/java/tools/refinery/store/query/viatra/QueryTest.java
@@ -110,6 +110,44 @@ class QueryTest {
         }
 
         @QueryEngineTest
+        void isConstantTest(QueryEvaluationHint hint) {
+                var predicate = Query.of("RelationConstraint", (builder, p1, p2) -> builder.clause(
+                                personView.call(p1),
+                                p1.isConstant(1),
+                                friendMustView.call(p1, p2)
+                ));
+
+                var store = ModelStore.builder()
+                                .symbols(person, friend)
+                                .with(ViatraModelQueryAdapter.builder()
+                                                .defaultHint(hint)
+                                                .queries(predicate))
+                                .build();
+
+                var model = store.createEmptyModel();
+                var personInterpretation = model.getInterpretation(person);
+                var friendInterpretation = model.getInterpretation(friend);
+                var queryEngine = model.getAdapter(ModelQueryAdapter.class);
+                var predicateResultSet = queryEngine.getResultSet(predicate);
+
+                personInterpretation.put(Tuple.of(0), true);
+                personInterpretation.put(Tuple.of(1), true);
+                personInterpretation.put(Tuple.of(2), true);
+
+                friendInterpretation.put(Tuple.of(0, 1), TruthValue.TRUE);
+                friendInterpretation.put(Tuple.of(1, 0), TruthValue.TRUE);
+                friendInterpretation.put(Tuple.of(1, 2), TruthValue.TRUE);
+
+                queryEngine.flushChanges();
+                assertResults(Map.of(
+                                Tuple.of(0, 1), false,
+                                Tuple.of(1, 0), true,
+                                Tuple.of(1, 2), true,
+                                Tuple.of(2, 1), false
+                ), predicateResultSet);
+        }
+
+        @QueryEngineTest
         void existTest(QueryEvaluationHint hint) {
                 var predicate = Query.of("Exists", (builder, p1) -> builder.clause((p2) -> List.of(
                                 personView.call(p1),