Examples with VertexLabelDefinition org.janusgraph.graphdb.schema.VertexLabelDefinition used on opensource projects

Example 1 with VertexLabelDefinition

use of org.janusgraph.graphdb.schema.VertexLabelDefinition in project janusgraph by JanusGraph.

the class JanusGraphTest method testSchemaTypes.

/* ==================================================================================
                            SCHEMA TESTS
     ==================================================================================*/
/**
 * Test the definition and inspection of various schema types and ensure their correct interpretation
 * within the graph
 */
@SuppressWarnings("unchecked")
@Test
public void testSchemaTypes() {
    // ---------- PROPERTY KEYS ----------------
    // Normal single-valued property key
    PropertyKey weight = makeKey("weight", Float.class);
    // Indexed unique property key
    PropertyKey uid = makeVertexIndexedUniqueKey("uid", String.class);
    // Indexed but not unique
    PropertyKey someId = makeVertexIndexedKey("someid", Object.class);
    // Set-valued property key
    PropertyKey name = mgmt.makePropertyKey("name").dataType(String.class).cardinality(Cardinality.SET).make();
    // List-valued property key with signature
    PropertyKey value = mgmt.makePropertyKey("value").dataType(Double.class).signature(weight).cardinality(Cardinality.LIST).make();
    // ---------- EDGE LABELS ----------------
    // Standard edge label
    EdgeLabel friend = mgmt.makeEdgeLabel("friend").make();
    // Unidirected
    EdgeLabel link = mgmt.makeEdgeLabel("link").unidirected().multiplicity(Multiplicity.MANY2ONE).make();
    // Signature label
    EdgeLabel connect = mgmt.makeEdgeLabel("connect").signature(uid).multiplicity(Multiplicity.SIMPLE).make();
    // Edge labels with different cardinalities
    EdgeLabel parent = mgmt.makeEdgeLabel("parent").multiplicity(Multiplicity.MANY2ONE).make();
    EdgeLabel child = mgmt.makeEdgeLabel("child").multiplicity(Multiplicity.ONE2MANY).make();
    EdgeLabel spouse = mgmt.makeEdgeLabel("spouse").multiplicity(Multiplicity.ONE2ONE).make();
    // ---------- VERTEX LABELS ----------------
    VertexLabel person = mgmt.makeVertexLabel("person").make();
    VertexLabel tag = mgmt.makeVertexLabel("tag").make();
    VertexLabel tweet = mgmt.makeVertexLabel("tweet").setStatic().make();
    long[] sig;
    // ######### INSPECTION & FAILURE ############
    assertTrue(mgmt.isOpen());
    assertEquals("weight", weight.toString());
    assertTrue(mgmt.containsRelationType("weight"));
    assertTrue(mgmt.containsPropertyKey("weight"));
    assertFalse(mgmt.containsEdgeLabel("weight"));
    assertTrue(mgmt.containsEdgeLabel("connect"));
    assertFalse(mgmt.containsPropertyKey("connect"));
    assertFalse(mgmt.containsRelationType("bla"));
    assertNull(mgmt.getPropertyKey("bla"));
    assertNull(mgmt.getEdgeLabel("bla"));
    assertNotNull(mgmt.getPropertyKey("weight"));
    assertNotNull(mgmt.getEdgeLabel("connect"));
    assertTrue(weight.isPropertyKey());
    assertFalse(weight.isEdgeLabel());
    assertEquals(Cardinality.SINGLE, weight.cardinality());
    assertEquals(Cardinality.SINGLE, someId.cardinality());
    assertEquals(Cardinality.SET, name.cardinality());
    assertEquals(Cardinality.LIST, value.cardinality());
    assertEquals(Object.class, someId.dataType());
    assertEquals(Float.class, weight.dataType());
    sig = ((InternalRelationType) value).getSignature();
    assertEquals(1, sig.length);
    assertEquals(weight.longId(), sig[0]);
    assertTrue(mgmt.getGraphIndex(uid.name()).isUnique());
    assertFalse(mgmt.getGraphIndex(someId.name()).isUnique());
    assertEquals("friend", friend.name());
    assertTrue(friend.isEdgeLabel());
    assertFalse(friend.isPropertyKey());
    assertEquals(Multiplicity.ONE2ONE, spouse.multiplicity());
    assertEquals(Multiplicity.ONE2MANY, child.multiplicity());
    assertEquals(Multiplicity.MANY2ONE, parent.multiplicity());
    assertEquals(Multiplicity.MULTI, friend.multiplicity());
    assertEquals(Multiplicity.SIMPLE, connect.multiplicity());
    assertTrue(link.isUnidirected());
    assertFalse(link.isDirected());
    assertFalse(child.isUnidirected());
    assertTrue(spouse.isDirected());
    assertFalse(((InternalRelationType) friend).isInvisibleType());
    assertTrue(((InternalRelationType) friend).isInvisible());
    assertEquals(0, ((InternalRelationType) friend).getSignature().length);
    sig = ((InternalRelationType) connect).getSignature();
    assertEquals(1, sig.length);
    assertEquals(uid.longId(), sig[0]);
    assertEquals(0, ((InternalRelationType) friend).getSortKey().length);
    assertEquals(Order.DEFAULT, ((InternalRelationType) friend).getSortOrder());
    assertEquals(SchemaStatus.ENABLED, ((InternalRelationType) friend).getStatus());
    assertEquals(5, Iterables.size(mgmt.getRelationTypes(PropertyKey.class)));
    assertEquals(6, Iterables.size(mgmt.getRelationTypes(EdgeLabel.class)));
    assertEquals(11, Iterables.size(mgmt.getRelationTypes(RelationType.class)));
    assertEquals(3, Iterables.size(mgmt.getVertexLabels()));
    assertEquals("tweet", tweet.name());
    assertTrue(mgmt.containsVertexLabel("person"));
    assertFalse(mgmt.containsVertexLabel("bla"));
    assertFalse(person.isPartitioned());
    assertFalse(person.isStatic());
    assertFalse(tag.isPartitioned());
    assertTrue(tweet.isStatic());
    // Failures
    try {
        // No data type
        mgmt.makePropertyKey("fid").make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // Already exists
        mgmt.makeEdgeLabel("link").unidirected().make();
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // signature and sort-key collide
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).sortKey(someId, weight).signature(someId).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // } catch (IllegalArgumentException e) {}
    try {
        // sort key requires the label to be non-constrained
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).multiplicity(Multiplicity.SIMPLE).sortKey(weight).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // sort key requires the label to be non-constrained
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).multiplicity(Multiplicity.MANY2ONE).sortKey(weight).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // Already exists
        mgmt.makeVertexLabel("tweet").make();
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // signature key must have non-generic data type
        mgmt.makeEdgeLabel("test").signature(someId).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // ######### END INSPECTION ############
    finishSchema();
    clopen();
    // Load schema types into current transaction
    weight = mgmt.getPropertyKey("weight");
    uid = mgmt.getPropertyKey("uid");
    someId = mgmt.getPropertyKey("someid");
    name = mgmt.getPropertyKey("name");
    value = mgmt.getPropertyKey("value");
    friend = mgmt.getEdgeLabel("friend");
    link = mgmt.getEdgeLabel("link");
    connect = mgmt.getEdgeLabel("connect");
    parent = mgmt.getEdgeLabel("parent");
    child = mgmt.getEdgeLabel("child");
    spouse = mgmt.getEdgeLabel("spouse");
    person = mgmt.getVertexLabel("person");
    tag = mgmt.getVertexLabel("tag");
    tweet = mgmt.getVertexLabel("tweet");
    // ######### INSPECTION & FAILURE (COPIED FROM ABOVE) ############
    assertTrue(mgmt.isOpen());
    assertEquals("weight", weight.toString());
    assertTrue(mgmt.containsRelationType("weight"));
    assertTrue(mgmt.containsPropertyKey("weight"));
    assertFalse(mgmt.containsEdgeLabel("weight"));
    assertTrue(mgmt.containsEdgeLabel("connect"));
    assertFalse(mgmt.containsPropertyKey("connect"));
    assertFalse(mgmt.containsRelationType("bla"));
    assertNull(mgmt.getPropertyKey("bla"));
    assertNull(mgmt.getEdgeLabel("bla"));
    assertNotNull(mgmt.getPropertyKey("weight"));
    assertNotNull(mgmt.getEdgeLabel("connect"));
    assertTrue(weight.isPropertyKey());
    assertFalse(weight.isEdgeLabel());
    assertEquals(Cardinality.SINGLE, weight.cardinality());
    assertEquals(Cardinality.SINGLE, someId.cardinality());
    assertEquals(Cardinality.SET, name.cardinality());
    assertEquals(Cardinality.LIST, value.cardinality());
    assertEquals(Object.class, someId.dataType());
    assertEquals(Float.class, weight.dataType());
    sig = ((InternalRelationType) value).getSignature();
    assertEquals(1, sig.length);
    assertEquals(weight.longId(), sig[0]);
    assertTrue(mgmt.getGraphIndex(uid.name()).isUnique());
    assertFalse(mgmt.getGraphIndex(someId.name()).isUnique());
    assertEquals("friend", friend.name());
    assertTrue(friend.isEdgeLabel());
    assertFalse(friend.isPropertyKey());
    assertEquals(Multiplicity.ONE2ONE, spouse.multiplicity());
    assertEquals(Multiplicity.ONE2MANY, child.multiplicity());
    assertEquals(Multiplicity.MANY2ONE, parent.multiplicity());
    assertEquals(Multiplicity.MULTI, friend.multiplicity());
    assertEquals(Multiplicity.SIMPLE, connect.multiplicity());
    assertTrue(link.isUnidirected());
    assertFalse(link.isDirected());
    assertFalse(child.isUnidirected());
    assertTrue(spouse.isDirected());
    assertFalse(((InternalRelationType) friend).isInvisibleType());
    assertTrue(((InternalRelationType) friend).isInvisible());
    assertEquals(0, ((InternalRelationType) friend).getSignature().length);
    sig = ((InternalRelationType) connect).getSignature();
    assertEquals(1, sig.length);
    assertEquals(uid.longId(), sig[0]);
    assertEquals(0, ((InternalRelationType) friend).getSortKey().length);
    assertEquals(Order.DEFAULT, ((InternalRelationType) friend).getSortOrder());
    assertEquals(SchemaStatus.ENABLED, ((InternalRelationType) friend).getStatus());
    assertEquals(5, Iterables.size(mgmt.getRelationTypes(PropertyKey.class)));
    assertEquals(6, Iterables.size(mgmt.getRelationTypes(EdgeLabel.class)));
    assertEquals(11, Iterables.size(mgmt.getRelationTypes(RelationType.class)));
    assertEquals(3, Iterables.size(mgmt.getVertexLabels()));
    assertEquals("tweet", tweet.name());
    assertTrue(mgmt.containsVertexLabel("person"));
    assertFalse(mgmt.containsVertexLabel("bla"));
    assertFalse(person.isPartitioned());
    assertFalse(person.isStatic());
    assertFalse(tag.isPartitioned());
    assertTrue(tweet.isStatic());
    // Failures
    try {
        // No data type
        mgmt.makePropertyKey("fid").make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // Already exists
        mgmt.makeEdgeLabel("link").unidirected().make();
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // signature and sort-key collide
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).sortKey(someId, weight).signature(someId).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // } catch (IllegalArgumentException e) {}
    try {
        // sort key requires the label to be non-constrained
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).multiplicity(Multiplicity.SIMPLE).sortKey(weight).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // sort key requires the label to be non-constrained
        ((StandardEdgeLabelMaker) mgmt.makeEdgeLabel("other")).multiplicity(Multiplicity.MANY2ONE).sortKey(weight).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    try {
        // Already exists
        mgmt.makeVertexLabel("tweet").make();
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // signature key must have non-generic data type
        mgmt.makeEdgeLabel("test").signature(someId).make();
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // ######### END INSPECTION ############
    /*
          ####### Make sure schema semantics are honored in transactions ######
        */
    clopen();
    JanusGraphTransaction tx2;
    // shouldn't exist
    assertEmpty(tx.query().has("uid", "v1").vertices());
    JanusGraphVertex v = tx.addVertex();
    // test property keys
    v.property("uid", "v1");
    v.property("weight", 1.5);
    v.property("someid", "Hello");
    v.property("name", "Bob");
    v.property("name", "John");
    VertexProperty p = v.property("value", 11);
    p.property("weight", 22);
    v.property("value", 33.3, "weight", 66.6);
    // same values are supported for list-properties
    v.property("value", 11, "weight", 22);
    // test edges
    JanusGraphVertex v12 = tx.addVertex("person"), v13 = tx.addVertex("person");
    v12.property("uid", "v12");
    v13.property("uid", "v13");
    v12.addEdge("parent", v, "weight", 4.5);
    v13.addEdge("parent", v, "weight", 4.5);
    v.addEdge("child", v12);
    v.addEdge("child", v13);
    v.addEdge("spouse", v12);
    v.addEdge("friend", v12);
    // supports multi edges
    v.addEdge("friend", v12);
    v.addEdge("connect", v12, "uid", "e1");
    v.addEdge("link", v13);
    JanusGraphVertex v2 = tx.addVertex("tweet");
    v2.addEdge("link", v13);
    v12.addEdge("connect", v2);
    JanusGraphEdge edge;
    // ######### INSPECTION & FAILURE ############
    assertEquals(v, getOnlyElement(tx.query().has("uid", Cmp.EQUAL, "v1").vertices()));
    v = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v1"));
    v12 = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v12"));
    v13 = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v13"));
    try {
        // Invalid data type
        v.property("weight", "x");
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // Only one "John" should be allowed
        v.property(VertexProperty.Cardinality.list, "name", "John");
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // Cannot set a property as edge
        v.property("link", v);
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // Only one property for weight allowed
    v.property(single, "weight", 1.0);
    assertCount(1, v.properties("weight"));
    v.property(VertexProperty.Cardinality.single, "weight", 0.5);
    assertEquals(0.5, v.<Float>value("weight").doubleValue(), 0.00001);
    assertEquals("v1", v.value("uid"));
    assertCount(2, v.properties("name"));
    for (Object prop : v.query().labels("name").properties()) {
        String nameString = ((JanusGraphVertexProperty<String>) prop).value();
        assertTrue(nameString.equals("Bob") || nameString.equals("John"));
    }
    assertTrue(Iterators.size(v.properties("value")) >= 3);
    for (Object o : v.query().labels("value").properties()) {
        JanusGraphVertexProperty<Double> prop = (JanusGraphVertexProperty<Double>) o;
        double prec = prop.value();
        assertEquals(prec * 2, prop.<Number>value("weight").doubleValue(), 0.00001);
    }
    // Ensure we can add additional values
    p = v.property("value", 44.4, "weight", 88.8);
    assertEquals(v, getOnlyElement(tx.query().has("someid", Cmp.EQUAL, "Hello").vertices()));
    // ------- EDGES -------
    try {
        // multiplicity violation
        v12.addEdge("parent", v13);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v13.addEdge("child", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v13.addEdge("spouse", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v.addEdge("spouse", v13);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    assertCount(2, v.query().direction(Direction.IN).labels("parent").edges());
    assertCount(1, v12.query().direction(Direction.OUT).labels("parent").has("weight").edges());
    assertCount(1, v13.query().direction(Direction.OUT).labels("parent").has("weight").edges());
    assertEquals(v12, getOnlyElement(v.query().direction(Direction.OUT).labels("spouse").vertices()));
    edge = Iterables.getOnlyElement(v.query().direction(Direction.BOTH).labels("connect").edges());
    assertEquals(1, edge.keys().size());
    assertEquals("e1", edge.value("uid"));
    try {
        // connect is simple
        v.addEdge("connect", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    // Make sure "link" is unidirected
    assertCount(1, v.query().direction(Direction.BOTH).labels("link").edges());
    assertCount(0, v13.query().direction(Direction.BOTH).labels("link").edges());
    // Assert we can add more friendships
    v.addEdge("friend", v12);
    v2 = Iterables.getOnlyElement(v12.query().direction(Direction.OUT).labels("connect").vertices());
    assertEquals(v13, getOnlyElement(v2.query().direction(Direction.OUT).labels("link").vertices()));
    assertEquals(BaseVertexLabel.DEFAULT_VERTEXLABEL.name(), v.label());
    assertEquals("person", v12.label());
    assertEquals("person", v13.label());
    assertCount(4, tx.query().vertices());
    // ######### END INSPECTION & FAILURE ############
    clopen();
    // ######### INSPECTION & FAILURE (copied from above) ############
    assertEquals(v, getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v1")));
    v = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v1"));
    v12 = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v12"));
    v13 = getOnlyVertex(tx.query().has("uid", Cmp.EQUAL, "v13"));
    try {
        // Invalid data type
        v.property("weight", "x");
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // Only one "John" should be allowed
        v.property(VertexProperty.Cardinality.list, "name", "John");
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // Cannot set a property as edge
        v.property("link", v);
        fail();
    } catch (IllegalArgumentException ignored) {
    }
    // Only one property for weight allowed
    v.property(VertexProperty.Cardinality.single, "weight", 1.0);
    assertCount(1, v.properties("weight"));
    v.property(VertexProperty.Cardinality.single, "weight", 0.5);
    assertEquals(0.5, v.<Float>value("weight").doubleValue(), 0.00001);
    assertEquals("v1", v.value("uid"));
    assertCount(2, v.properties("name"));
    for (Object o : v.query().labels("name").properties()) {
        JanusGraphVertexProperty<String> prop = (JanusGraphVertexProperty<String>) o;
        String nameString = prop.value();
        assertTrue(nameString.equals("Bob") || nameString.equals("John"));
    }
    assertTrue(Iterables.size(v.query().labels("value").properties()) >= 3);
    for (Object o : v.query().labels("value").properties()) {
        JanusGraphVertexProperty<Double> prop = (JanusGraphVertexProperty<Double>) o;
        double prec = prop.value();
        assertEquals(prec * 2, prop.<Number>value("weight").doubleValue(), 0.00001);
    }
    // Ensure we can add additional values
    p = v.property("value", 44.4, "weight", 88.8);
    assertEquals(v, getOnlyElement(tx.query().has("someid", Cmp.EQUAL, "Hello").vertices()));
    // ------- EDGES -------
    try {
        // multiplicity violation
        v12.addEdge("parent", v13);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v13.addEdge("child", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v13.addEdge("spouse", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        // multiplicity violation
        v.addEdge("spouse", v13);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    assertCount(2, v.query().direction(Direction.IN).labels("parent").edges());
    assertCount(1, v12.query().direction(Direction.OUT).labels("parent").has("weight").edges());
    assertCount(1, v13.query().direction(Direction.OUT).labels("parent").has("weight").edges());
    assertEquals(v12, getOnlyElement(v.query().direction(Direction.OUT).labels("spouse").vertices()));
    edge = Iterables.getOnlyElement(v.query().direction(Direction.BOTH).labels("connect").edges());
    assertEquals(1, edge.keys().size());
    assertEquals("e1", edge.value("uid"));
    try {
        // connect is simple
        v.addEdge("connect", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    // Make sure "link" is unidirected
    assertCount(1, v.query().direction(Direction.BOTH).labels("link").edges());
    assertCount(0, v13.query().direction(Direction.BOTH).labels("link").edges());
    // Assert we can add more friendships
    v.addEdge("friend", v12);
    v2 = Iterables.getOnlyElement(v12.query().direction(Direction.OUT).labels("connect").vertices());
    assertEquals(v13, getOnlyElement(v2.query().direction(Direction.OUT).labels("link").vertices()));
    assertEquals(BaseVertexLabel.DEFAULT_VERTEXLABEL.name(), v.label());
    assertEquals("person", v12.label());
    assertEquals("person", v13.label());
    assertCount(4, tx.query().vertices());
    // ######### END INSPECTION & FAILURE ############
    // Ensure index uniqueness enforcement
    tx2 = graph.newTransaction();
    try {
        JanusGraphVertex vx = tx2.addVertex();
        try {
            // property is unique
            vx.property(VertexProperty.Cardinality.single, "uid", "v1");
            fail();
        } catch (SchemaViolationException ignored) {
        }
        vx.property(VertexProperty.Cardinality.single, "uid", "unique");
        JanusGraphVertex vx2 = tx2.addVertex();
        try {
            // property unique
            vx2.property(VertexProperty.Cardinality.single, "uid", "unique");
            fail();
        } catch (SchemaViolationException ignored) {
        }
    } finally {
        tx2.rollback();
    }
    // Ensure that v2 is really static
    v2 = getV(tx, v2);
    assertEquals("tweet", v2.label());
    try {
        v2.property(VertexProperty.Cardinality.single, "weight", 11);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    try {
        v2.addEdge("friend", v12);
        fail();
    } catch (SchemaViolationException ignored) {
    }
    // Ensure that unidirected edges keep pointing to deleted vertices
    getV(tx, v13).remove();
    assertCount(1, v.query().direction(Direction.BOTH).labels("link").edges());
    // Finally, test the schema container
    SchemaContainer schemaContainer = new SchemaContainer(graph);
    assertTrue(schemaContainer.containsRelationType("weight"));
    assertTrue(schemaContainer.containsRelationType("friend"));
    assertTrue(schemaContainer.containsVertexLabel("person"));
    VertexLabelDefinition vld = schemaContainer.getVertexLabel("tag");
    assertFalse(vld.isPartitioned());
    assertFalse(vld.isStatic());
    PropertyKeyDefinition pkd = schemaContainer.getPropertyKey("name");
    assertEquals(Cardinality.SET, pkd.getCardinality());
    assertEquals(String.class, pkd.getDataType());
    EdgeLabelDefinition eld = schemaContainer.getEdgeLabel("child");
    assertEquals("child", eld.getName());
    assertEquals(child.longId(), eld.getLongId());
    assertEquals(Multiplicity.ONE2MANY, eld.getMultiplicity());
    assertFalse(eld.isUnidirected());
}