ChildrenTraverseProcessorImplTest.java

/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.stunner.core.graph.processing.traverse.content;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.kie.workbench.common.stunner.core.TestingGraphInstanceBuilder;
import org.kie.workbench.common.stunner.core.TestingGraphMockHandler;
import org.kie.workbench.common.stunner.core.graph.Node;
import org.kie.workbench.common.stunner.core.graph.processing.traverse.tree.TreeWalkTraverseProcessorImpl;
import org.mockito.ArgumentCaptor;
import org.mockito.runners.MockitoJUnitRunner;

import static org.junit.Assert.*;
import static org.mockito.Matchers.eq;
import static org.mockito.Mockito.*;

@RunWith(MockitoJUnitRunner.class)
public class ChildrenTraverseProcessorImplTest {

    private TestingGraphMockHandler graphTestHandler;
    private ChildrenTraverseProcessorImpl tested;

    @Before
    public void setup() {
        this.graphTestHandler = new TestingGraphMockHandler();
        this.tested = new ChildrenTraverseProcessorImpl(new TreeWalkTraverseProcessorImpl());
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testTraverseGraph1() {
        final TestingGraphInstanceBuilder.TestGraph1 result =
                TestingGraphInstanceBuilder.newGraph1(graphTestHandler);
        final ChildrenTraverseCallback callback = mock(ChildrenTraverseCallback.class);
        tested.traverse(result.graph,
                        callback);
        verify(callback,
               times(1)).startNodeTraversal(eq(result.startNode));
        verify(callback,
               times(1)).startNodeTraversal(eq(result.intermNode));
        verify(callback,
               times(1)).startNodeTraversal(eq(result.endNode));
    }

    @Test
    @SuppressWarnings("unchecked")
    public void testTraverseGraph2() {
        final TestingGraphInstanceBuilder.TestGraph2 result =
                TestingGraphInstanceBuilder.newGraph2(graphTestHandler);
        final ChildrenTraverseCallback callback = mock(ChildrenTraverseCallback.class);
        final ArgumentCaptor<List> cStartNodeParents = ArgumentCaptor.forClass(List.class);
        final ArgumentCaptor<List> cIntermNodeParents = ArgumentCaptor.forClass(List.class);
        final ArgumentCaptor<List> cEndNodeParents = ArgumentCaptor.forClass(List.class);
        tested.traverse(result.graph,
                        callback);
        verify(callback,
               never()).startGraphTraversal(eq(result.graph));
        verify(callback,
               times(1)).startNodeTraversal(eq(result.parentNode));
        verify(callback,
               times(1)).startNodeTraversal(cStartNodeParents.capture(),
                                            eq(result.startNode));
        verify(callback,
               times(1)).startNodeTraversal(cIntermNodeParents.capture(),
                                            eq(result.intermNode));
        verify(callback,
               times(1)).startNodeTraversal(cEndNodeParents.capture(),
                                            eq(result.endNode));
        final List<Node> startNodeParents = cStartNodeParents.getValue();
        final List<Node> intermNodeParents = cStartNodeParents.getValue();
        final List<Node> endNodeParents = cStartNodeParents.getValue();
        assertEquals(1,
                     startNodeParents.size());
        assertEquals(result.parentNode,
                     startNodeParents.get(0));
        assertEquals(1,
                     intermNodeParents.size());
        assertEquals(result.parentNode,
                     intermNodeParents.get(0));
        assertEquals(1,
                     endNodeParents.size());
        assertEquals(result.parentNode,
                     endNodeParents.get(0));
    }
}