43 lines
1.0 KiB
Java
43 lines
1.0 KiB
Java
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package com.iluwatar.nullobject;
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import org.junit.Test;
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import org.mockito.Mockito;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.Assert.assertSame;
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/**
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* Date: 12/26/15 - 11:47 PM
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*
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* @author Jeroen Meulemeester
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*/
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public class NullNodeTest extends StdOutTest {
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/**
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* Verify if {@link NullNode#getInstance()} actually returns the same object instance
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*/
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@Test
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public void testGetInstance() {
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final NullNode instance = NullNode.getInstance();
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assertNotNull(instance);
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assertSame(instance, NullNode.getInstance());
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}
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@Test
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public void testFields() {
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final NullNode node = NullNode.getInstance();
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assertEquals(0, node.getTreeSize());
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assertNull(node.getName());
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assertNull(node.getLeft());
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assertNull(node.getRight());
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}
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@Test
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public void testWalk() throws Exception {
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NullNode.getInstance().walk();
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Mockito.verifyZeroInteractions(getStdOutMock());
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}
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}
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