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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/request/external/CachingExternalReads.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/request/external/CachingExternalReads.java
new file mode 100644
index 000000000..087dba232
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/api/request/external/CachingExternalReads.java
@@ -0,0 +1,69 @@
+package org.simantics.db.tests.api.request.external;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+import org.simantics.Simantics;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Session;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.request.ExternalRead;
+import org.simantics.db.testing.cases.FreshDatabaseTest;
+
+public class CachingExternalReads extends FreshDatabaseTest {
+
+    public static final String RESULT = "Hello World!";
+
+    static class MyExternalRead implements ExternalRead<String> {
+
+        int registerCount = 0;
+
+        @Override
+        public void register(ReadGraph graph, Listener<String> procedure) {
+            if (DEBUG)
+                System.out.println("register");
+            ++registerCount;
+            procedure.execute(RESULT);            
+        }
+
+        @Override
+        public void unregistered() {
+            if (DEBUG)
+                System.out.println("unregistered");
+        }
+
+        public int getRegisterCount() {
+            return registerCount;
+        }        
+    };
+
+    @Test
+    public void test() throws Exception {
+        Session session = Simantics.getSession();
+        
+        MyExternalRead read = new MyExternalRead();
+        
+        for(int i=0;i<10;++i) {
+            session.syncRequest(read, new Listener<String>() {
+                @Override
+                public void execute(String result) {
+                    if (DEBUG)
+                        System.out.println("=> " + result);
+                }
+
+                @Override
+                public void exception(Throwable t) {
+                    t.printStackTrace();
+                }
+
+                @Override
+                public boolean isDisposed() {
+                    return false;
+                }
+                
+            });
+        }
+
+        Assert.assertEquals(1, read.registerCount);
+    }
+}