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package com.diasparsoftware.util.junit;
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import java.util.*;
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import junit.framework.*;
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7
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import org.apache.commons.collections.*;
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import com.diasparsoftware.java.util.*;
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public abstract class ValueObjectEqualsTest extends TestCase {
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private Object control;
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private Map differentObjects = new HashMap();
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private Object equalToControl;
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private Object equalToControl2;
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private static final int NUM_ITERATIONS = 20;
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protected abstract Object createControlInstance() throws Exception;
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protected abstract Object createInstanceDiffersIn(String keyPropertyName)
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throws Exception;
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protected abstract List keyPropertyNames();
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128
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protected void setUp() throws Exception {
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super.setUp();
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control = createControlInstance();
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equalToControl = createControlInstance();
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equalToControl2 = createControlInstance();
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128
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CollectionUtil
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.forEachDo(keyPropertyNames(), new ExceptionalClosure() {
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384
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public Object execute(Object each) throws Exception {
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384
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String eachName = (String) each;
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384
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differentObjects.put(
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each,
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createInstanceDiffersIn(eachName));
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384
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return null;
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}
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});
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128
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try {
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128
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assertNotNull(
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"createControlInstance() returned null",
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control);
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128
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assertNotNull(
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"2nd createControlInstance() returned null",
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equalToControl);
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assertNotNull(
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"3rd createControlInstance() returned null",
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equalToControl2);
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eachDifferentObjectDo(new MapEntryClosure() {
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384
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public void eachMapEntry(Object key, Object value) {
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384
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assertNotNull(nameOf(key) + "returned null", value);
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}
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});
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Assert.assertNotSame(control, equalToControl);
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Assert.assertNotSame(control, equalToControl2);
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eachDifferentObjectDo(new MapEntryClosure() {
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384
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public void eachMapEntry(Object key, Object value) {
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384
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Assert.assertNotSame(
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nameOf(key) + " same as control",
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control,
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value);
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384
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Assert.assertNotSame(
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nameOf(key) + " same as equalToControl",
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equalToControl,
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value);
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384
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Assert.assertNotSame(
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nameOf(key) + " same as equalToControl2",
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equalToControl2,
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value);
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}
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});
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Assert.assertNotSame(equalToControl, equalToControl2);
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assertEquals(
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"1st and 2nd equal instances of different classes",
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control.getClass(),
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equalToControl.getClass());
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128
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assertEquals(
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"1st and 3rd equal instances of different classes",
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control.getClass(),
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equalToControl2.getClass());
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eachDifferentObjectDo(new MapEntryClosure() {
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384
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public void eachMapEntry(Object key, Object value) {
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384
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assertEquals(
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"control instance and "
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+ nameOf(key)
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+ " of different classes",
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control.getClass(),
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value.getClass());
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}
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});
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}
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catch (AssertionFailedError ex) {
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0
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throw new IllegalArgumentException(ex.getMessage());
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}
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}
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128
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336
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public final void testEqualsAgainstNewObject() {
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336
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final Object o = new Object();
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assertNotEquals(o, control);
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assertNotEquals(o, equalToControl);
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assertNotEquals(o, equalToControl2);
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336
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eachDifferentObjectDo(new MapEntryClosure() {
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1008
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public void eachMapEntry(Object key, Object value) {
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1008
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assertNotEquals(o, value);
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}
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});
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}
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145
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146
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147
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336
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public final void testEqualsAgainstNull() {
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336
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assertNotEquals("null vs. 1st", null, control);
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assertNotEquals("null vs. 2nd", null, equalToControl);
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assertNotEquals("null vs. 3rd", null, equalToControl2);
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eachDifferentObjectDo(new MapEntryClosure() {
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1008
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public void eachMapEntry(Object key, Object value) {
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1008
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assertNotEquals("null vs. " + nameOf(key), null, value);
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}
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});
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}
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159
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336
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public final void testEqualsAgainstUnequalObjects() {
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336
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eachDifferentObjectDo(new MapEntryClosure() {
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1008
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public void eachMapEntry(Object key, Object value) {
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1008
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assertNotEquals(
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"1st vs. " + nameOf(key),
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control,
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value);
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1008
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assertNotEquals(
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"2nd vs. " + nameOf(key),
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equalToControl,
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value);
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1008
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assertNotEquals(
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"3rd vs. " + nameOf(key),
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equalToControl2,
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value);
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1008
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assertNotEquals(
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nameOf(key) + " vs. 1st",
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value,
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control);
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1008
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assertNotEquals(
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nameOf(key) + " vs. 2nd",
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value,
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equalToControl);
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1008
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assertNotEquals(
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nameOf(key) + " vs. 3rd",
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value,
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equalToControl2);
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}
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});
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}
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196
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197
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198
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16
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public final void testEqualsIsConsistentAcrossInvocations() {
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16
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for (int i = 0; i < NUM_ITERATIONS; ++i) {
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320
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testEqualsAgainstNewObject();
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320
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testEqualsAgainstNull();
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320
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testEqualsAgainstUnequalObjects();
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320
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testEqualsIsReflexive();
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320
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testEqualsIsSymmetricAndTransitive();
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}
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}
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209
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210
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211
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336
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public final void testEqualsIsReflexive() {
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336
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assertEquals("1st equal instance", control, control);
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336
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assertEquals(
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"2nd equal instance",
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equalToControl,
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equalToControl);
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336
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assertEquals(
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"3rd equal instance",
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equalToControl2,
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equalToControl2);
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336
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eachDifferentObjectDo(new MapEntryClosure() {
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1008
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public void eachMapEntry(Object key, Object value) {
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1008
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assertEquals(nameOf(key) + " instance", value, value);
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}
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});
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}
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230
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231
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232
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233
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234
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336
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public final void testEqualsIsSymmetricAndTransitive() {
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336
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assertEquals("1st vs. 2nd", control, equalToControl);
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336
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assertEquals("2nd vs. 1st", equalToControl, control);
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237
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238
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336
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assertEquals("1st vs. 3rd", control, equalToControl2);
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336
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assertEquals("3rd vs. 1st", equalToControl2, control);
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240
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241
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336
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assertEquals("2nd vs. 3rd", equalToControl, equalToControl2);
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336
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assertEquals("3rd vs. 2nd", equalToControl2, equalToControl);
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}
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245
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246
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247
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248
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16
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public final void testHashCodeContract() {
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249
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16
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assertEquals(
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"1st vs. 2nd",
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control.hashCode(),
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equalToControl.hashCode());
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253
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16
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assertEquals(
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"1st vs. 3rd",
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control.hashCode(),
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equalToControl2.hashCode());
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257
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16
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assertEquals(
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258
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"2nd vs. 3rd",
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equalToControl.hashCode(),
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260
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equalToControl2.hashCode());
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261
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}
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262
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263
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264
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265
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266
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16
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public final void testHashCodeIsConsistentAcrossInvocations() {
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267
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16
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int eq1Hash = control.hashCode();
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268
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16
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int eq2Hash = equalToControl.hashCode();
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269
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16
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int eq3Hash = equalToControl2.hashCode();
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270
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271
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16
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final Map differentObjectsHashes = new HashMap();
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272
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273
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16
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eachDifferentObjectDo(new MapEntryClosure() {
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274
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48
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public void eachMapEntry(Object key, Object value) {
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275
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48
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differentObjectsHashes.put(
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276
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key,
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277
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new Integer(value.hashCode()));
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278
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}
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279
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});
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280
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281
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16
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for (int i = 0; i < NUM_ITERATIONS; ++i) {
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282
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320
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assertEquals(
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283
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"1st equal instance",
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284
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eq1Hash,
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285
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control.hashCode());
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286
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320
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assertEquals(
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287
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"2nd equal instance",
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288
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eq2Hash,
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289
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equalToControl.hashCode());
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290
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320
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assertEquals(
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291
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"3rd equal instance",
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eq3Hash,
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293
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equalToControl2.hashCode());
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294
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295
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320
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eachDifferentObjectDo(new MapEntryClosure() {
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296
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960
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public void eachMapEntry(Object key, Object value) {
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297
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960
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assertEquals(
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298
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nameOf(key) + " instance",
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299
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((Integer) differentObjectsHashes.get(key))
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300
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.intValue(),
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301
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value.hashCode());
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302
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}
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303
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});
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304
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}
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305
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}
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306
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307
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2016
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protected static void assertNotEquals(Object lhs, Object rhs) {
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308
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2016
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assertNotEquals(null, lhs, rhs);
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309
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}
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310
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311
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10080
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protected static void assertNotEquals(
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312
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String failureMessage,
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313
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Object lhs,
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314
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Object rhs) {
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315
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10080
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if (lhs != null)
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316
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8064
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assertFalse(failureMessage, lhs.equals(rhs));
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317
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}
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318
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319
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2064
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private void eachDifferentObjectDo(Closure closure) {
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320
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2064
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CollectionUtils.forAllDo(differentObjects.entrySet(), closure);
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321
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}
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322
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323
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10944
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private final String nameOf(Object key) {
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324
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10944
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return "objectDiffersBy('" + key + "')";
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325
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}
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326
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}
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