diff --git a/s-pipes-core/src/main/java/cz/cvut/spipes/modules/RetrievePrefixesModule.java b/s-pipes-core/src/main/java/cz/cvut/spipes/modules/RetrievePrefixesModule.java
index 679bb96b..3052009b 100644
--- a/s-pipes-core/src/main/java/cz/cvut/spipes/modules/RetrievePrefixesModule.java
+++ b/s-pipes-core/src/main/java/cz/cvut/spipes/modules/RetrievePrefixesModule.java
@@ -58,4 +58,8 @@ public String getTypeURI() {
     @Override
     public void loadConfiguration() {
     }
+
+    void setOntologyDocumentManager(OntologyDocumentManager ontologyDocumentManager) {
+        this.ontologyDocumentManager = ontologyDocumentManager;
+    }
 }
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diff --git a/s-pipes-core/src/test/java/cz/cvut/spipes/modules/RetrievePrefixesModuleTest.java b/s-pipes-core/src/test/java/cz/cvut/spipes/modules/RetrievePrefixesModuleTest.java
index 11a91cd7..f26d5f61 100644
--- a/s-pipes-core/src/test/java/cz/cvut/spipes/modules/RetrievePrefixesModuleTest.java
+++ b/s-pipes-core/src/test/java/cz/cvut/spipes/modules/RetrievePrefixesModuleTest.java
@@ -2,29 +2,90 @@
 
 import cz.cvut.spipes.engine.ExecutionContext;
 import cz.cvut.spipes.engine.ExecutionContextFactory;
-import cz.cvut.spipes.manager.OntoDocManager;
 import cz.cvut.spipes.manager.OntologyDocumentManager;
+import org.apache.jena.ontology.OntDocumentManager;
+import org.apache.jena.ontology.OntModel;
+import org.apache.jena.ontology.OntModelSpec;
+import org.apache.jena.rdf.model.ModelFactory;
+import org.apache.jena.util.FileManager;
 import org.apache.jena.util.FileUtils;
-import org.junit.jupiter.api.Disabled;
+import org.apache.jena.vocabulary.OWL;
+import org.apache.jena.vocabulary.RDF;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
 
-import java.nio.file.Path;
-import java.nio.file.Paths;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
 
+import static org.mockito.BDDMockito.given;
+
+@ExtendWith(MockitoExtension.class)
 class RetrievePrefixesModuleTest {
 
-    @Disabled
+    @Mock
+    OntologyDocumentManager ontoDocManager;
+
+    private final static String[] ontologyResourcePaths = new String[]{
+        "/manager/import-closure/indirect-import.ttl",
+        "/manager/import-closure/direct-import.ttl"
+    };
+
+    HashMap<String, OntModel> uri2ontModel;
+
+    @BeforeEach
+    void setUp() {
+        uri2ontModel = new LinkedHashMap<>();
+        for (String ontologyPath : ontologyResourcePaths) {
+            OntModel model = loadOntModel(ontologyPath);
+            String iri = getOntologyIri(model);
+            uri2ontModel.put(
+                iri,
+                model
+            );
+        }
+    }
+
     @Test
-    void testGetPrefixesFromFile() {
+    void testExecuteSelf() {
+        given(ontoDocManager.getRegisteredOntologyUris()).willReturn(uri2ontModel.keySet());
+        uri2ontModel.forEach((key, value) -> given(ontoDocManager.getOntology(key)).willReturn(value));
+
         ExecutionContext inputExecutionContext = ExecutionContextFactory.createEmptyContext();
-        OntologyDocumentManager ontDocManager = OntoDocManager.getInstance();
-        Path ontologiesDir = Paths.get("/home/blcha/projects/kbss/git/s-pipes/s-pipes-core/src/test/resources/manager");
-        ontDocManager.registerDocuments(ontologiesDir);
 
         RetrievePrefixesModule retrievePrefixesModule = new RetrievePrefixesModule();
+        retrievePrefixesModule.setOntologyDocumentManager(ontoDocManager);
         retrievePrefixesModule.setInputContext(inputExecutionContext);
         ExecutionContext outputExecutionContext = retrievePrefixesModule.executeSelf();
 
         outputExecutionContext.getDefaultModel().write(System.out, FileUtils.langTurtle, null);
     }
+
+
+    private static String getOntologyIri(OntModel model) {
+        return model.listResourcesWithProperty(RDF.type, OWL.Ontology).nextResource().toString();
+    }
+
+    private static OntModel loadOntModel(String resourcePath) {
+        InputStream is = RetrievePrefixesModuleTest.class.getResourceAsStream(resourcePath);
+
+        if (is == null) {
+            throw new IllegalArgumentException("Resource " + resourcePath + " not found.");
+        }
+        return loadOntModel(is);
+    }
+
+    private static OntModel loadOntModel(InputStream inputStream) {
+        OntModel ontModel = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
+
+        OntDocumentManager dm = OntDocumentManager.getInstance();
+        dm.setFileManager(FileManager.get());
+
+        ontModel.read(inputStream, null, FileUtils.langTurtle);
+        dm.loadImports(ontModel);
+        return ontModel;
+    }
 }
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