gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/lambda/ElementValueTraversalTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.tinkerpop.gremlin.process.traversal.lambda;

import org.apache.tinkerpop.gremlin.process.traversal.traverser.B_O_Traverser;
import org.apache.tinkerpop.gremlin.structure.Edge;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class ElementValueTraversalTest {

    @Test
    public void shouldWorkOnVertex() {
        final ElementValueTraversal<Integer> t = new ElementValueTraversal<>("age");
        final Vertex v = mock(Vertex.class);
        when(v.value("age")).thenReturn(29);
        t.addStart(new B_O_Traverser(v, 1).asAdmin());
        assertEquals(29, t.next().intValue());
    }

    @Test
    public void shouldWorkOnEdge() {
        final ElementValueTraversal<Double> t = new ElementValueTraversal<>("weight");
        final Edge e = mock(Edge.class);
        when(e.value("weight")).thenReturn(1.0d);
        t.addStart(new B_O_Traverser(e, 1).asAdmin());
        assertEquals(1.0d, t.next(), 0.00001d);
    }

    @Test
    public void shouldWorkOnVertexProperty() {
        final ElementValueTraversal<Integer> t = new ElementValueTraversal<>("age");
        final VertexProperty vp = mock(VertexProperty.class);
        when(vp.value("age")).thenReturn(29);
        t.addStart(new B_O_Traverser(vp, 1).asAdmin());
        assertEquals(29, t.next().intValue());
    }

    @Test
    public void shouldWorkOnMap() {
        final ElementValueTraversal<Integer> t = new ElementValueTraversal<>("age");
        final Map<String,Integer> m = new HashMap<>();
        m.put("age", 29);
        t.addStart(new B_O_Traverser(m, 1).asAdmin());
        assertEquals(29, t.next().intValue());
    }

    @Test(expected = IllegalStateException.class)
    public void shouldThrowExceptionWhenTryingUnsupportedType() {
        final ElementValueTraversal<Integer> t = new ElementValueTraversal<>("age");
        t.addStart(new B_O_Traverser(29, 1).asAdmin());
        t.next();
    }
}