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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/isSubrelationOf/IsSubrelationOfTest1.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/isSubrelationOf/IsSubrelationOfTest1.java
new file mode 100644
index 000000000..592bf4ca3
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+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/readGraph/isSubrelationOf/IsSubrelationOfTest1.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.tests.api.readGraph.isSubrelationOf;
+
+import org.junit.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.common.request.ReadRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.testing.base.SimpleBase;
+import org.simantics.layer0.Layer0;
+
+public class IsSubrelationOfTest1 extends SimpleBase {
+	@Test
+    public void testSubrelationOf() throws DatabaseException {
+        getSession().syncRequest(new ReadRequest() {
+            @Override
+            public void run(ReadGraph g) throws DatabaseException {
+                Layer0 l0 = Layer0.getInstance(g);
+                /*
+                 * Null arguments are not allowed but are not checked. The
+                 * behavior in this case is unspecified and can't be tested.
+                 */
+//                assertFalse(g.isSubrelationOf(null, null));
+//                assertFalse(g.isSubrelationOf(rl, null));
+                // Current implementation doesn't check if argument is relation.
+                assertTrue(g.isSubrelationOf(rl, rl));
+                // By definition returns true if the two resources are equal.
+                assertTrue(g.isSubrelationOf(l0.Relation, l0.Relation));
+                assertFalse(g.isSubrelationOf(rl, l0.Relation));
+                assertFalse(g.isSubrelationOf(rl, l0.Entity));
+                assertFalse(g.isSubrelationOf(rl, l0.Library));
+                assertFalse(g.isSubrelationOf(l0.IsRelatedTo, l0.Relation));
+                assertFalse(g.isSubrelationOf(l0.FunctionalRelation, l0.Relation));
+                assertTrue(g.isSubrelationOf(l0.InverseOf, l0.DependsOn));
+                assertTrue(g.isSubrelationOf(l0.InverseOf, l0.IsRelatedTo));
+                assertTrue(g.isSubrelationOf(l0.InverseOf, l0.IsWeaklyRelatedTo));
+                assertFalse(g.isSubrelationOf(l0.InverseOf, l0.Relation));
+                assertFalse(g.isSubrelationOf(l0.InverseOf, l0.FunctionalRelation));
+                assertFalse(g.isSubrelationOf(l0.InverseOf, l0.Relation));
+                assertTrue(g.isSubrelationOf(l0.SubrelationOf, l0.DependsOn));
+            }
+        });
+    }
+}
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