MapAbstractTest.java
/*
* Copyright (c) 2008, Harald Kuhr
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/*
* Copyright 2001-2004 The Apache Software Foundation
*
* 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
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package com.twelvemonkeys.util;
import java.util.*;
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;
/**
* Abstract test class for {@link java.util.Map} methods and contracts.
* <p/>
* The forces at work here are similar to those in {@link CollectionAbstractTest}.
* If your class implements the full Map interface, including optional
* operations, simply extend this class, and implement the
* {@link #makeEmptyMap()} method.
* <p/>
* On the other hand, if your map implementation is weird, you may have to
* override one or more of the other protected methods. They're described
* below.
* <p/>
* <b>Entry Population Methods</b>
* <p/>
* Override these methods if your map requires special entries:
* <p/>
* <ul>
* <li>{@link #getSampleKeys()}
* <li>{@link #getSampleValues()}
* <li>{@link #getNewSampleValues()}
* <li>{@link #getOtherKeys()}
* <li>{@link #getOtherValues()}
* </ul>
* <p/>
* <b>Supported Operation Methods</b>
* <p/>
* Override these methods if your map doesn't support certain operations:
* <p/>
* <ul>
* <li> {@link #isPutAddSupported()}
* <li> {@link #isPutChangeSupported()}
* <li> {@link #isSetValueSupported()}
* <li> {@link #isRemoveSupported()}
* <li> {@link #isGetStructuralModify()}
* <li> {@link #isAllowDuplicateValues()}
* <li> {@link #isAllowNullKey()}
* <li> {@link #isAllowNullValue()}
* </ul>
* <p/>
* <b>Fixture Methods</b>
* <p/>
* For tests on modification operations (puts and removes), fixtures are used
* to verify that that operation results in correct state for the map and its
* collection views. Basically, the modification is performed against your
* map implementation, and an identical modification is performed against
* a <I>confirmed</I> map implementation. A confirmed map implementation is
* something like {@code java.util.HashMap}, which is known to conform
* exactly to the {@link Map} contract. After the modification takes place
* on both your map implementation and the confirmed map implementation, the
* two maps are compared to see if their state is identical. The comparison
* also compares the collection views to make sure they're still the same.<P>
* <p/>
* The upshot of all that is that <I>any</I> test that modifies the map in
* <I>any</I> way will verify that <I>all</I> of the map's state is still
* correct, including the state of its collection views. So for instance
* if a key is removed by the map's key set's iterator, then the entry set
* is checked to make sure the key/value pair no longer appears.<P>
* <p/>
* The {@link #map} field holds an instance of your collection implementation.
* The {@link #entrySet}, {@link #keySet} and {@link #values} fields hold
* that map's collection views. And the {@link #confirmed} field holds
* an instance of the confirmed collection implementation. The
* {@link #resetEmpty()} and {@link #resetFull()} methods set these fields to
* empty or full maps, so that tests can proceed from a known state.<P>
* <p/>
* After a modification operation to both {@link #map} and {@link #confirmed},
* the {@link #verifyAll()} method is invoked to compare the results. The
* {@link # verify0} method calls separate methods to verify the map and its three
* collection views ({@link #verifyMap}, {@link #verifyEntrySet},
* {@link #verifyKeySet}, and {@link #verifyValues}). You may want to override
* one of the verification methodsto perform additional verifications. For
* instance, TestDoubleOrderedMap would want override its
* {@link #verifyValues()} method to verify that the values are unique and in
* ascending order.<P>
* <p/>
* <b>Other Notes</b>
* <p/>
* If your {@link Map} fails one of these tests by design, you may still use
* this base set of cases. Simply override the test case (method) your map
* fails and/or the methods that define the assumptions used by the test
* cases. For example, if your map does not allow duplicate values, override
* {@link #isAllowDuplicateValues()} and have it return {@code false}
*
* @author Michael Smith
* @author Rodney Waldhoff
* @author Paul Jack
* @author Stephen Colebourne
* @version $Revision: #2 $ $Date: 2008/07/15 $
*/
public abstract class MapAbstractTest extends ObjectAbstractTest {
/**
* JDK1.2 has bugs in null handling of Maps, especially HashMap.Entry.toString
* This avoids nulls for JDK1.2
*/
private static final boolean JDK12;
static {
String str = System.getProperty("java.version");
JDK12 = str.startsWith("1.2");
}
// These instance variables are initialized with the reset method.
// Tests for map methods that alter the map (put, putAll, remove)
// first call reset() to create the map and its views; then perform
// the modification on the map; perform the same modification on the
// confirmed; and then call verifyAll() to ensure that the map is equal
// to the confirmed, that the already-constructed collection views
// are still equal to the confirmed's collection views.
/** Map created by reset(). */
protected Map map;
/** Entry set of map created by reset(). */
protected Set entrySet;
/** Key set of map created by reset(). */
protected Set keySet;
/** Values collection of map created by reset(). */
protected Collection values;
/** HashMap created by reset(). */
protected Map confirmed;
// TODO: Figure out if we need these tests...
protected boolean skipSerializedCanonicalTests() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* support the {@code put} and {@code putAll} operations
* adding new mappings.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support put adding.
*/
public boolean isPutAddSupported() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* support the {@code put} and {@code putAll} operations
* changing existing mappings.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support put changing.
*/
public boolean isPutChangeSupported() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* support the {@code setValue} operation on entrySet entries.
* <p/>
* Default implementation returns isPutChangeSupported().
* Override if your collection class does not support setValue but does
* support put changing.
*/
public boolean isSetValueSupported() {
return isPutChangeSupported();
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* support the {@code remove} and {@code clear} operations.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support removal operations.
*/
public boolean isRemoveSupported() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* can cause structural modification on a get(). The example is LRUMap.
* <p/>
* Default implementation returns false.
* Override if your map class structurally modifies on get.
*/
public boolean isGetStructuralModify() {
return false;
}
/**
* Returns whether the sub map views of SortedMap are serializable.
* If the class being tested is based around a TreeMap then you should
* override and return false as TreeMap has a bug in deserialization.
*
* @return false
*/
public boolean isSubMapViewsSerializable() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* supports null keys.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support null keys.
*/
public boolean isAllowNullKey() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* supports null values.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support null values.
*/
public boolean isAllowNullValue() {
return true;
}
/**
* Returns true if the maps produced by
* {@link #makeEmptyMap()} and {@link #makeFullMap()}
* supports duplicate values.
* <p/>
* Default implementation returns true.
* Override if your collection class does not support duplicate values.
*/
public boolean isAllowDuplicateValues() {
return true;
}
/**
* Returns the set of keys in the mappings used to test the map. This
* method must return an array with the same length as {@link
* #getSampleValues()} and all array elements must be different. The
* default implementation constructs a set of String keys, and includes a
* single null key if {@link #isAllowNullKey()} returns {@code true}.
*/
public Object[] getSampleKeys() {
Object[] result = new Object[] {
"blah", "foo", "bar", "baz", "tmp", "gosh", "golly", "gee",
"hello", "goodbye", "we'll", "see", "you", "all", "again",
"key",
"key2",
(isAllowNullKey() && !JDK12) ? null : "nonnullkey"
};
return result;
}
public Object[] getOtherKeys() {
return getOtherNonNullStringElements();
}
public Object[] getOtherValues() {
return getOtherNonNullStringElements();
}
/**
* Returns a list of string elements suitable for return by
* {@link #getOtherKeys()} or {@link #getOtherValues}.
* <p/>
* <p>Override getOtherElements to returnthe results of this method if your
* collection does not support heterogenous elements or the null element.
* </p>
*/
public Object[] getOtherNonNullStringElements() {
return new Object[] {
"For", "then", "despite",/* of */"space", "I", "would", "be", "brought",
"From", "limits", "far", "remote", "where", "thou", "dost", "stay"
};
}
/**
* Returns the set of values in the mappings used to test the map. This
* method must return an array with the same length as
* {@link #getSampleKeys()}. The default implementation constructs a set of
* String values and includes a single null value if
* {@link #isAllowNullValue()} returns {@code true}, and includes
* two values that are the same if {@link #isAllowDuplicateValues()} returns
* {@code true}.
*/
public Object[] getSampleValues() {
Object[] result = new Object[] {
"blahv", "foov", "barv", "bazv", "tmpv", "goshv", "gollyv", "geev",
"hellov", "goodbyev", "we'llv", "seev", "youv", "allv", "againv",
(isAllowNullValue() && !JDK12) ? null : "nonnullvalue",
"value",
(isAllowDuplicateValues()) ? "value" : "value2",
};
return result;
}
/**
* Returns a the set of values that can be used to replace the values
* returned from {@link #getSampleValues()}. This method must return an
* array with the same length as {@link #getSampleValues()}. The values
* returned from this method should not be the same as those returned from
* {@link #getSampleValues()}. The default implementation constructs a
* set of String values and includes a single null value if
* {@link #isAllowNullValue()} returns {@code true}, and includes two values
* that are the same if {@link #isAllowDuplicateValues()} returns
* {@code true}.
*/
public Object[] getNewSampleValues() {
Object[] result = new Object[] {
(isAllowNullValue() && !JDK12 && isAllowDuplicateValues()) ? null : "newnonnullvalue",
"newvalue",
(isAllowDuplicateValues()) ? "newvalue" : "newvalue2",
"newblahv", "newfoov", "newbarv", "newbazv", "newtmpv", "newgoshv",
"newgollyv", "newgeev", "newhellov", "newgoodbyev", "newwe'llv",
"newseev", "newyouv", "newallv", "newagainv",
};
return result;
}
/**
* Helper method to add all the mappings described by
* {@link #getSampleKeys()} and {@link #getSampleValues()}.
*/
public void addSampleMappings(Map m) {
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
for (int i = 0; i < keys.length; i++) {
try {
m.put(keys[i], values[i]);
}
catch (NullPointerException exception) {
assertTrue(keys[i] == null || values[i] == null,
"NullPointerException only allowed to be thrown if either the key or value is null.");
assertTrue(keys[i] == null || !isAllowNullKey(),
"NullPointerException on null key, but isAllowNullKey is not overridden to return false.");
assertTrue(values[i] == null || !isAllowNullValue(),
"NullPointerException on null value, but isAllowNullValue is not overridden to return false.");
fail("Unknown reason for NullPointer.");
}
}
assertEquals(keys.length, m.size(), "size must reflect number of mappings added.");
}
//-----------------------------------------------------------------------
/**
* Return a new, empty {@link Map} to be used for testing.
*
* @return the map to be tested
*/
public abstract Map makeEmptyMap();
/**
* Return a new, populated map. The mappings in the map should match the
* keys and values returned from {@link #getSampleKeys()} and
* {@link #getSampleValues()}. The default implementation uses makeEmptyMap()
* and calls {@link #addSampleMappings} to add all the mappings to the
* map.
*
* @return the map to be tested
*/
public Map makeFullMap() {
Map m = makeEmptyMap();
addSampleMappings(m);
return m;
}
/**
* Implements the superclass method to return the map to be tested.
*
* @return the map to be tested
*/
public Object makeObject() {
return makeEmptyMap();
}
/**
* Override to return a map other than HashMap as the confirmed map.
*
* @return a map that is known to be valid
*/
public Map makeConfirmedMap() {
return new HashMap();
}
/**
* Creates a new Map Entry that is independent of the first and the map.
*/
public Map.Entry cloneMapEntry(Map.Entry entry) {
HashMap map = new HashMap();
map.put(entry.getKey(), entry.getValue());
return (Map.Entry) map.entrySet().iterator().next();
}
/**
* Gets the compatability version, needed for package access.
*/
public String getCompatibilityVersion() {
return super.getCompatibilityVersion();
}
//-----------------------------------------------------------------------
/**
* Test to ensure the test setup is working properly. This method checks
* to ensure that the getSampleKeys and getSampleValues methods are
* returning results that look appropriate. That is, they both return a
* non-null array of equal length. The keys array must not have any
* duplicate values, and may only contain a (single) null key if
* isNullKeySupported() returns true. The values array must only have a null
* value if useNullValue() is true and may only have duplicate values if
* isAllowDuplicateValues() returns true.
*/
@Test
public void testSampleMappings() {
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
Object[] newValues = getNewSampleValues();
assertTrue(keys != null, "failure in test: Must have keys returned from getSampleKeys.");
assertTrue(values != null, "failure in test: Must have values returned from getSampleValues.");
// verify keys and values have equivalent lengths (in case getSampleX are
// overridden)
assertEquals(keys.length, values.length, "failure in test: not the same number of sample keys and values.");
assertEquals(values.length, newValues.length, "failure in test: not the same number of values and new values.");
// verify there aren't duplicate keys, and check values
for (int i = 0; i < keys.length - 1; i++) {
for (int j = i + 1; j < keys.length; j++) {
assertTrue((keys[i] != null || keys[j] != null), "failure in test: duplicate null keys.");
assertTrue((keys[i] == null || keys[j] == null || (!keys[i].equals(keys[j]) && !keys[j].equals(keys[i]))),
"failure in test: duplicate non-null key.");
}
assertTrue(keys[i] != null || isAllowNullKey(),"failure in test: found null key, but isNullKeySupported is false.");
assertTrue(values[i] != null || isAllowNullValue(),"failure in test: found null value, but isNullValueSupported is false.");
assertTrue(newValues[i] != null || isAllowNullValue(), "failure in test: found null new value, but isNullValueSupported is false.");
assertTrue(values[i] != newValues[i] && (values[i] == null || !values[i].equals(newValues[i])), "failure in test: values should not be the same as new value");
}
}
// tests begin here. Each test adds a little bit of tested functionality.
// Many methods assume previous methods passed. That is, they do not
// exhaustively recheck things that have already been checked in a previous
// test methods.
/**
* Test to ensure that makeEmptyMap and makeFull returns a new non-null
* map with each invocation.
*/
@Test
public void testMakeMap() {
Map em = makeEmptyMap();
assertTrue(em != null, "failure in test: makeEmptyMap must return a non-null map.");
Map em2 = makeEmptyMap();
assertTrue(em2 != null, "failure in test: makeEmptyMap must return a non-null map.");
assertTrue(em != em2, "failure in test: makeEmptyMap must return a new map with each invocation.");
Map fm = makeFullMap();
assertTrue(fm != null, "failure in test: makeFullMap must return a non-null map.");
Map fm2 = makeFullMap();
assertTrue(fm2 != null, "failure in test: makeFullMap must return a non-null map.");
assertTrue(fm != fm2, "failure in test: makeFullMap must return a new map with each invocation.");
}
/**
* Tests Map.isEmpty()
*/
@Test
public void testMapIsEmpty() {
resetEmpty();
assertEquals(true, map.isEmpty(), "Map.isEmpty() should return true with an empty map");
verifyAll();
resetFull();
assertEquals(false, map.isEmpty(), "Map.isEmpty() should return false with a non-empty map");
verifyAll();
}
/**
* Tests Map.size()
*/
@Test
public void testMapSize() {
resetEmpty();
assertEquals(0, map.size(), "Map.size() should be 0 with an empty map");
verifyAll();
resetFull();
assertEquals(getSampleKeys().length, map.size(), "Map.size() should equal the number of entries in the map");
verifyAll();
}
/**
* Tests {@link Map#clear()}. If the map {@link #isRemoveSupported()}
* can add and remove elements}, then {@link Map#size()} and
* {@link Map#isEmpty()} are used to ensure that map has no elements after
* a call to clear. If the map does not support adding and removing
* elements, this method checks to ensure clear throws an
* UnsupportedOperationException.
*/
@Test
public void testMapClear() {
if (!isRemoveSupported()) {
try {
resetFull();
map.clear();
fail("Expected UnsupportedOperationException on clear");
}
catch (UnsupportedOperationException ex) {
}
return;
}
resetEmpty();
map.clear();
confirmed.clear();
verifyAll();
resetFull();
map.clear();
confirmed.clear();
verifyAll();
}
/**
* Tests Map.containsKey(Object) by verifying it returns false for all
* sample keys on a map created using an empty map and returns true for
* all sample keys returned on a full map.
*/
@Test
public void testMapContainsKey() {
Object[] keys = getSampleKeys();
resetEmpty();
for (Object key : keys) {
assertTrue(!map.containsKey(key), "Map must not contain key when map is empty");
}
verifyAll();
resetFull();
for (Object key : keys) {
assertTrue(map.containsKey(key), "Map must contain key for a mapping in the map. Missing: " + key);
}
verifyAll();
}
/**
* Tests Map.containsValue(Object) by verifying it returns false for all
* sample values on an empty map and returns true for all sample values on
* a full map.
*/
@Test
public void testMapContainsValue() {
Object[] values = getSampleValues();
resetEmpty();
for (Object value : values) {
assertTrue(!map.containsValue(value), "Empty map must not contain value");
}
verifyAll();
resetFull();
for (Object value : values) {
assertTrue(map.containsValue(value), "Map must contain value for a mapping in the map.");
}
verifyAll();
}
/**
* Tests Map.equals(Object)
*/
@Test
public void testMapEquals() {
resetEmpty();
assertTrue(map.equals(confirmed), "Empty maps unequal.");
verifyAll();
resetFull();
assertTrue(map.equals(confirmed), "Full maps unequal.");
verifyAll();
resetFull();
// modify the HashMap created from the full map and make sure this
// change results in map.equals() to return false.
Iterator iter = confirmed.keySet().iterator();
iter.next();
iter.remove();
assertTrue(!map.equals(confirmed), "Different maps equal.");
resetFull();
assertTrue(!map.equals(null), "equals(null) returned true.");
assertTrue(!map.equals(new Object()), "equals(new Object()) returned true.");
verifyAll();
}
/**
* Tests Map.get(Object)
*/
@Test
public void testMapGet() {
resetEmpty();
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
for (Object key : keys) {
assertTrue(map.get(key) == null, "Empty map.get() should return null.");
}
verifyAll();
resetFull();
for (int i = 0; i < keys.length; i++) {
assertEquals(values[i], map.get(keys[i]), "Full map.get() should return value from mapping.");
}
}
/**
* Tests Map.hashCode()
*/
@Test
public void testMapHashCode() {
resetEmpty();
assertTrue(map.hashCode() == confirmed.hashCode(), "Empty maps have different hashCodes.");
resetFull();
assertTrue(map.hashCode() == confirmed.hashCode(), "Equal maps have different hashCodes.");
}
/**
* Tests Map.toString(). Since the format of the string returned by the
* toString() method is not defined in the Map interface, there is no
* common way to test the results of the toString() method. Thereforce,
* it is encouraged that Map implementations override this test with one
* that checks the format matches any format defined in its API. This
* default implementation just verifies that the toString() method does
* not return null.
*/
@Test
public void testMapToString() {
resetEmpty();
assertTrue(map.toString() != null, "Empty map toString() should not return null");
verifyAll();
resetFull();
assertTrue(map.toString() != null, "Empty map toString() should not return null");
verifyAll();
}
/**
* Compare the current serialized form of the Map
* against the canonical version in CVS.
*/
/*
@Test
public void testEmptyMapCompatibility() throws Exception {
/*
* Create canonical objects with this code
Map map = makeEmptyMap();
if (!(map instanceof Serializable)) return;
writeExternalFormToDisk((Serializable) map, getCanonicalEmptyCollectionName(map));
//
// test to make sure the canonical form has been preserved
Map map = makeEmptyMap();
if (map instanceof Serializable && !skipSerializedCanonicalTests() && isTestSerialization()) {
Map map2 = (Map) readExternalFormFromDisk(getCanonicalEmptyCollectionName(map));
assertEquals("Map is empty", 0, map2.size());
}
}
*/
/**
* Compare the current serialized form of the Map
* against the canonical version in CVS.
*/
//public void testFullMapCompatibility() throws Exception {
/**
* Create canonical objects with this code
Map map = makeFullMap();
if (!(map instanceof Serializable)) return;
writeExternalFormToDisk((Serializable) map, getCanonicalFullCollectionName(map));
*/
/*
// test to make sure the canonical form has been preserved
Map map = makeFullMap();
if (map instanceof Serializable && !skipSerializedCanonicalTests() && isTestSerialization()) {
Map map2 = (Map) readExternalFormFromDisk(getCanonicalFullCollectionName(map));
assertEquals("Map is the right size", getSampleKeys().length, map2.size());
}
}*/
/**
* Tests Map.put(Object, Object)
*/
@Test
public void testMapPut() {
resetEmpty();
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
Object[] newValues = getNewSampleValues();
if (isPutAddSupported()) {
for (int i = 0; i < keys.length; i++) {
Object o = map.put(keys[i], values[i]);
confirmed.put(keys[i], values[i]);
verifyAll();
assertTrue(o == null, "First map.put should return null");
assertTrue(map.containsKey(keys[i]), "Map should contain key after put");
assertTrue(map.containsValue(values[i]), "Map should contain value after put");
}
if (isPutChangeSupported()) {
for (int i = 0; i < keys.length; i++) {
Object o = map.put(keys[i], newValues[i]);
confirmed.put(keys[i], newValues[i]);
verifyAll();
assertEquals(values[i], o, "Map.put should return previous value when changed");
assertTrue(map.containsKey(keys[i]), "Map should still contain key after put when changed");
assertTrue(map.containsValue(newValues[i]), "Map should contain new value after put when changed");
// if duplicates are allowed, we're not guaranteed that the value
// no longer exists, so don't try checking that.
if (!isAllowDuplicateValues()) {
assertTrue(!map.containsValue(values[i]), "Map should not contain old value after put when changed");
}
}
}
else {
try {
// two possible exception here, either valid
map.put(keys[0], newValues[0]);
fail("Expected IllegalArgumentException or UnsupportedOperationException on put (change)");
}
catch (IllegalArgumentException ex) {
}
catch (UnsupportedOperationException ex) {
}
}
}
else if (isPutChangeSupported()) {
resetEmpty();
try {
map.put(keys[0], values[0]);
fail("Expected UnsupportedOperationException or IllegalArgumentException on put (add) when fixed size");
}
catch (IllegalArgumentException ex) {
}
catch (UnsupportedOperationException ex) {
}
resetFull();
int i = 0;
for (Iterator it = map.keySet().iterator(); it.hasNext() && i < newValues.length; i++) {
Object key = it.next();
Object o = map.put(key, newValues[i]);
Object value = confirmed.put(key, newValues[i]);
verifyAll();
assertEquals(value, o, "Map.put should return previous value when changed");
assertTrue(map.containsKey(key), "Map should still contain key after put when changed");
assertTrue(map.containsValue(newValues[i]), "Map should contain new value after put when changed");
// if duplicates are allowed, we're not guaranteed that the value
// no longer exists, so don't try checking that.
if (!isAllowDuplicateValues()) {
assertTrue(!map.containsValue(values[i]), "Map should not contain old value after put when changed");
}
}
}
else {
try {
map.put(keys[0], values[0]);
fail("Expected UnsupportedOperationException on put (add)");
}
catch (UnsupportedOperationException ex) {
}
}
}
/**
* Tests Map.put(null, value)
*/
@Test
public void testMapPutNullKey() {
resetFull();
Object[] values = getSampleValues();
if (isPutAddSupported()) {
if (isAllowNullKey()) {
map.put(null, values[0]);
}
else {
try {
map.put(null, values[0]);
fail("put(null, value) should throw NPE/IAE");
}
catch (NullPointerException ex) {
}
catch (IllegalArgumentException ex) {
}
}
}
}
/**
* Tests Map.put(null, value)
*/
@Test
public void testMapPutNullValue() {
resetFull();
Object[] keys = getSampleKeys();
if (isPutAddSupported()) {
if (isAllowNullValue()) {
map.put(keys[0], null);
}
else {
try {
map.put(keys[0], null);
fail("put(key, null) should throw NPE/IAE");
}
catch (NullPointerException ex) {
}
catch (IllegalArgumentException ex) {
}
}
}
}
/**
* Tests Map.putAll(map)
*/
@Test
public void testMapPutAll() {
if (!isPutAddSupported()) {
if (!isPutChangeSupported()) {
Map temp = makeFullMap();
resetEmpty();
try {
map.putAll(temp);
fail("Expected UnsupportedOperationException on putAll");
}
catch (UnsupportedOperationException ex) {
}
}
return;
}
resetEmpty();
Map m2 = makeFullMap();
map.putAll(m2);
confirmed.putAll(m2);
verifyAll();
resetEmpty();
m2 = makeConfirmedMap();
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
for (int i = 0; i < keys.length; i++) {
m2.put(keys[i], values[i]);
}
map.putAll(m2);
confirmed.putAll(m2);
verifyAll();
}
/**
* Tests Map.remove(Object)
*/
@Test
public void testMapRemove() {
if (!isRemoveSupported()) {
try {
resetFull();
map.remove(map.keySet().iterator().next());
fail("Expected UnsupportedOperationException on remove");
}
catch (UnsupportedOperationException ex) {
}
return;
}
resetEmpty();
Object[] keys = getSampleKeys();
Object[] values = getSampleValues();
for (int i = 0; i < keys.length; i++) {
Object o = map.remove(keys[i]);
assertTrue(o == null, "First map.remove should return null");
}
verifyAll();
resetFull();
for (int i = 0; i < keys.length; i++) {
Object o = map.remove(keys[i]);
confirmed.remove(keys[i]);
verifyAll();
assertEquals(values[i], o, "map.remove with valid key should return value");
}
Object[] other = getOtherKeys();
resetFull();
int size = map.size();
for (int i = 0; i < other.length; i++) {
Object o = map.remove(other[i]);
assertEquals(o, null, "map.remove for nonexistent key should return null");
assertEquals(size, map.size(), "map.remove for nonexistent key should not shrink map");
}
verifyAll();
}
//-----------------------------------------------------------------------
/**
* Tests that the {@link Map#values} collection is backed by
* the underlying map for clear().
*/
@Test
public void testValuesClearChangesMap() {
if (!isRemoveSupported()) {
return;
}
// clear values, reflected in map
resetFull();
Collection values = map.values();
assertTrue(map.size() > 0);
assertTrue(values.size() > 0);
values.clear();
assertTrue(map.size() == 0);
assertTrue(values.size() == 0);
// clear map, reflected in values
resetFull();
values = map.values();
assertTrue(map.size() > 0);
assertTrue(values.size() > 0);
map.clear();
assertTrue(map.size() == 0);
assertTrue(values.size() == 0);
}
/**
* Tests that the {@link Map#keySet} collection is backed by
* the underlying map for clear().
*/
@Test
public void testKeySetClearChangesMap() {
if (!isRemoveSupported()) {
return;
}
// clear values, reflected in map
resetFull();
Set keySet = map.keySet();
assertTrue(map.size() > 0);
assertTrue(keySet.size() > 0);
keySet.clear();
assertTrue(map.size() == 0);
assertTrue(keySet.size() == 0);
// clear map, reflected in values
resetFull();
keySet = map.keySet();
assertTrue(map.size() > 0);
assertTrue(keySet.size() > 0);
map.clear();
assertTrue(map.size() == 0);
assertTrue(keySet.size() == 0);
}
/**
* Tests that the {@link Map#entrySet()} collection is backed by
* the underlying map for clear().
*/
@Test
public void testEntrySetClearChangesMap() {
if (!isRemoveSupported()) {
return;
}
// clear values, reflected in map
resetFull();
Set entrySet = map.entrySet();
assertTrue(map.size() > 0);
assertTrue(entrySet.size() > 0);
entrySet.clear();
assertTrue(map.size() == 0);
assertTrue(entrySet.size() == 0);
// clear map, reflected in values
resetFull();
entrySet = map.entrySet();
assertTrue(map.size() > 0);
assertTrue(entrySet.size() > 0);
map.clear();
assertTrue(map.size() == 0);
assertTrue(entrySet.size() == 0);
}
//-----------------------------------------------------------------------
@Test
public void testEntrySetContains1() {
resetFull();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
assertEquals(true, entrySet.contains(entry));
}
@Test
public void testEntrySetContains2() {
resetFull();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
Map.Entry test = cloneMapEntry(entry);
assertEquals(true, entrySet.contains(test));
}
@Test
public void testEntrySetContains3() {
resetFull();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
HashMap temp = new HashMap();
temp.put(entry.getKey(), "A VERY DIFFERENT VALUE");
Map.Entry test = (Map.Entry) temp.entrySet().iterator().next();
assertEquals(false, entrySet.contains(test));
}
@Test
public void testEntrySetRemove1() {
if (!isRemoveSupported()) {
return;
}
resetFull();
int size = map.size();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
Object key = entry.getKey();
assertEquals(true, entrySet.remove(entry));
assertEquals(false, map.containsKey(key));
assertEquals(size - 1, map.size());
}
@Test
public void testEntrySetRemove2() {
if (!isRemoveSupported()) {
return;
}
resetFull();
int size = map.size();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
Object key = entry.getKey();
Map.Entry test = cloneMapEntry(entry);
assertEquals(true, entrySet.remove(test));
assertEquals(false, map.containsKey(key));
assertEquals(size - 1, map.size());
}
@Test
public void testEntrySetRemove3() {
if (!isRemoveSupported()) {
return;
}
resetFull();
int size = map.size();
Set entrySet = map.entrySet();
Map.Entry entry = (Map.Entry) entrySet.iterator().next();
Object key = entry.getKey();
HashMap temp = new HashMap();
temp.put(entry.getKey(), "A VERY DIFFERENT VALUE");
Map.Entry test = (Map.Entry) temp.entrySet().iterator().next();
assertEquals(false, entrySet.remove(test));
assertEquals(true, map.containsKey(key));
assertEquals(size, map.size());
}
//-----------------------------------------------------------------------
/**
* Tests that the {@link Map#values} collection is backed by
* the underlying map by removing from the values collection
* and testing if the value was removed from the map.
* <p>
* We should really test the "vice versa" case--that values removed
* from the map are removed from the values collection--also,
* but that's a more difficult test to construct (lacking a
* "removeValue" method.)
* </p>
* <p>
* See bug <a href="http://issues.apache.org/bugzilla/show_bug.cgi?id=9573">
* 9573</a>.
* </p>
*/
@Test
public void testValuesRemoveChangesMap() {
resetFull();
Object[] sampleValues = getSampleValues();
Collection values = map.values();
for (int i = 0; i < sampleValues.length; i++) {
if (map.containsValue(sampleValues[i])) {
int j = 0; // loop counter prevents infinite loops when remove is broken
while (values.contains(sampleValues[i]) && j < 10000) {
try {
values.remove(sampleValues[i]);
}
catch (UnsupportedOperationException e) {
// if values.remove is unsupported, just skip this test
return;
}
j++;
}
assertTrue(j < 10000, "values().remove(obj) is broken");
assertTrue(!map.containsValue(sampleValues[i]),
"Value should have been removed from the underlying map.");
}
}
}
/**
* Tests that the {@link Map#keySet} set is backed by
* the underlying map by removing from the keySet set
* and testing if the key was removed from the map.
*/
@Test
public void testKeySetRemoveChangesMap() {
resetFull();
Object[] sampleKeys = getSampleKeys();
Set keys = map.keySet();
for (int i = 0; i < sampleKeys.length; i++) {
try {
keys.remove(sampleKeys[i]);
}
catch (UnsupportedOperationException e) {
// if key.remove is unsupported, just skip this test
return;
}
assertTrue(!map.containsKey(sampleKeys[i]),
"Key should have been removed from the underlying map.");
}
}
// TODO: Need:
// testValuesRemovedFromEntrySetAreRemovedFromMap
// same for EntrySet/KeySet/values's
// Iterator.remove, removeAll, retainAll
/**
* Utility methods to create an array of Map.Entry objects
* out of the given key and value arrays.<P>
*
* @param keys the array of keys
* @param values the array of values
* @return an array of Map.Entry of those keys to those values
*/
private Map.Entry[] makeEntryArray(Object[] keys, Object[] values) {
Map.Entry[] result = new Map.Entry[keys.length];
for (int i = 0; i < keys.length; i++) {
Map map = makeConfirmedMap();
map.put(keys[i], values[i]);
result[i] = (Map.Entry) map.entrySet().iterator().next();
}
return result;
}
/**
* Bulk test {@link Map#entrySet()}. This method runs through all of
* the tests in {@link SetAbstractTest}.
* After modification operations, {@link #verifyAll()} is invoked to ensure
* that the map and the other collection views are still valid.
*
* @return a {@link SetAbstractTest} instance for testing the map's entry set
*/
/*
public BulkTest bulkTestMapEntrySet() {
return new TestMapEntrySet();
}
*/
public class TestMapEntrySet extends SetAbstractTest {
// Have to implement manually; entrySet doesn't support addAll
public Object[] getFullElements() {
Object[] k = getSampleKeys();
Object[] v = getSampleValues();
return makeEntryArray(k, v);
}
// Have to implement manually; entrySet doesn't support addAll
public Object[] getOtherElements() {
Object[] k = getOtherKeys();
Object[] v = getOtherValues();
return makeEntryArray(k, v);
}
public Set makeEmptySet() {
return makeEmptyMap().entrySet();
}
public Set makeFullSet() {
return makeFullMap().entrySet();
}
public boolean isAddSupported() {
// Collection views don't support add operations.
return false;
}
public boolean isRemoveSupported() {
// Entry set should only support remove if map does
return MapAbstractTest.this.isRemoveSupported();
}
public boolean isGetStructuralModify() {
return MapAbstractTest.this.isGetStructuralModify();
}
public boolean isTestSerialization() {
return false;
}
public void resetFull() {
MapAbstractTest.this.resetFull();
collection = map.entrySet();
TestMapEntrySet.this.confirmed = MapAbstractTest.this.confirmed.entrySet();
}
public void resetEmpty() {
MapAbstractTest.this.resetEmpty();
collection = map.entrySet();
TestMapEntrySet.this.confirmed = MapAbstractTest.this.confirmed.entrySet();
}
@Test
public void testMapEntrySetIteratorEntry() {
resetFull();
Iterator it = collection.iterator();
int count = 0;
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
assertEquals(true, MapAbstractTest.this.map.containsKey(entry.getKey()));
assertEquals(true, MapAbstractTest.this.map.containsValue(entry.getValue()));
if (isGetStructuralModify() == false) {
assertEquals(MapAbstractTest.this.map.get(entry.getKey()), entry.getValue());
}
count++;
}
assertEquals(collection.size(), count);
}
@Test
public void testMapEntrySetIteratorEntrySetValue() {
Object key1 = getSampleKeys()[0];
Object key2 = (getSampleKeys().length == 1 ? getSampleKeys()[0] : getSampleKeys()[1]);
Object newValue1 = getNewSampleValues()[0];
Object newValue2 = (getNewSampleValues().length == 1 ? getNewSampleValues()[0] : getNewSampleValues()[1]);
resetFull();
// explicitly get entries as sample values/keys are connected for some maps
// such as BeanMap
Iterator it = TestMapEntrySet.this.collection.iterator();
Map.Entry entry1 = getEntry(it, key1);
it = TestMapEntrySet.this.collection.iterator();
Map.Entry entry2 = getEntry(it, key2);
Iterator itConfirmed = TestMapEntrySet.this.confirmed.iterator();
Map.Entry entryConfirmed1 = getEntry(itConfirmed, key1);
itConfirmed = TestMapEntrySet.this.confirmed.iterator();
Map.Entry entryConfirmed2 = getEntry(itConfirmed, key2);
verifyAll();
if (isSetValueSupported() == false) {
try {
entry1.setValue(newValue1);
}
catch (UnsupportedOperationException ex) {
}
return;
}
entry1.setValue(newValue1);
entryConfirmed1.setValue(newValue1);
assertEquals(newValue1, entry1.getValue());
assertEquals(true, MapAbstractTest.this.map.containsKey(entry1.getKey()));
assertEquals(true, MapAbstractTest.this.map.containsValue(newValue1));
assertEquals(newValue1, MapAbstractTest.this.map.get(entry1.getKey()));
verifyAll();
entry1.setValue(newValue1);
entryConfirmed1.setValue(newValue1);
assertEquals(newValue1, entry1.getValue());
assertEquals(true, MapAbstractTest.this.map.containsKey(entry1.getKey()));
assertEquals(true, MapAbstractTest.this.map.containsValue(newValue1));
assertEquals(newValue1, MapAbstractTest.this.map.get(entry1.getKey()));
verifyAll();
entry2.setValue(newValue2);
entryConfirmed2.setValue(newValue2);
assertEquals(newValue2, entry2.getValue());
assertEquals(true, MapAbstractTest.this.map.containsKey(entry2.getKey()));
assertEquals(true, MapAbstractTest.this.map.containsValue(newValue2));
assertEquals(newValue2, MapAbstractTest.this.map.get(entry2.getKey()));
verifyAll();
}
public Map.Entry getEntry(Iterator itConfirmed, Object key) {
Map.Entry entry = null;
while (itConfirmed.hasNext()) {
Map.Entry temp = (Map.Entry) itConfirmed.next();
if (temp.getKey() == null) {
if (key == null) {
entry = temp;
break;
}
}
else if (temp.getKey().equals(key)) {
entry = temp;
break;
}
}
assertNotNull(entry, "No matching entry in map for key '" + key + "'");
return entry;
}
@Test
public void testMapEntrySetRemoveNonMapEntry() {
if (isRemoveSupported() == false) {
return;
}
resetFull();
assertEquals(false, getSet().remove(null));
assertEquals(false, getSet().remove(new Object()));
}
public void verifyAll() {
super.verifyAll();
MapAbstractTest.this.verifyAll();
}
}
/**
* Bulk test {@link Map#keySet()}. This method runs through all of
* the tests in {@link SetAbstractTest}.
* After modification operations, {@link #verifyAll()} is invoked to ensure
* that the map and the other collection views are still valid.
*
* @return a {@link SetAbstractTest} instance for testing the map's key set
*/
/*
public BulkTest bulkTestMapKeySet() {
return new TestMapKeySet();
}
*/
public class TestMapKeySet extends SetAbstractTest {
public Object[] getFullElements() {
return getSampleKeys();
}
public Object[] getOtherElements() {
return getOtherKeys();
}
public Set makeEmptySet() {
return makeEmptyMap().keySet();
}
public Set makeFullSet() {
return makeFullMap().keySet();
}
public boolean isNullSupported() {
return MapAbstractTest.this.isAllowNullKey();
}
public boolean isAddSupported() {
return false;
}
public boolean isRemoveSupported() {
return MapAbstractTest.this.isRemoveSupported();
}
public boolean isTestSerialization() {
return false;
}
public void resetEmpty() {
MapAbstractTest.this.resetEmpty();
collection = map.keySet();
TestMapKeySet.this.confirmed = MapAbstractTest.this.confirmed.keySet();
}
public void resetFull() {
MapAbstractTest.this.resetFull();
collection = map.keySet();
TestMapKeySet.this.confirmed = MapAbstractTest.this.confirmed.keySet();
}
public void verifyAll() {
super.verifyAll();
MapAbstractTest.this.verifyAll();
}
}
/**
* Bulk test {@link Map#values()}. This method runs through all of
* the tests in {@link CollectionAbstractTest}.
* After modification operations, {@link #verifyAll()} is invoked to ensure
* that the map and the other collection views are still valid.
*
* @return a {@link CollectionAbstractTest} instance for testing the map's
* values collection
*/
/*
public BulkTest bulkTestMapValues() {
return new TestMapValues();
}
*/
public class TestMapValues extends CollectionAbstractTest {
public Object[] getFullElements() {
return getSampleValues();
}
public Object[] getOtherElements() {
return getOtherValues();
}
public Collection makeCollection() {
return makeEmptyMap().values();
}
public Collection makeFullCollection() {
return makeFullMap().values();
}
public boolean isNullSupported() {
return MapAbstractTest.this.isAllowNullKey();
}
public boolean isAddSupported() {
return false;
}
public boolean isRemoveSupported() {
return MapAbstractTest.this.isRemoveSupported();
}
public boolean isTestSerialization() {
return false;
}
public boolean areEqualElementsDistinguishable() {
// equal values are associated with different keys, so they are
// distinguishable.
return true;
}
public Collection makeConfirmedCollection() {
// never gets called, reset methods are overridden
return null;
}
public Collection makeConfirmedFullCollection() {
// never gets called, reset methods are overridden
return null;
}
public void resetFull() {
MapAbstractTest.this.resetFull();
collection = map.values();
TestMapValues.this.confirmed = MapAbstractTest.this.confirmed.values();
}
public void resetEmpty() {
MapAbstractTest.this.resetEmpty();
collection = map.values();
TestMapValues.this.confirmed = MapAbstractTest.this.confirmed.values();
}
public void verifyAll() {
super.verifyAll();
MapAbstractTest.this.verifyAll();
}
// TODO: should test that a remove on the values collection view
// removes the proper mapping and not just any mapping that may have
// the value equal to the value returned from the values iterator.
}
/**
* Resets the {@link #map}, {@link #entrySet}, {@link #keySet},
* {@link #values} and {@link #confirmed} fields to empty.
*/
public void resetEmpty() {
this.map = makeEmptyMap();
views();
this.confirmed = makeConfirmedMap();
}
/**
* Resets the {@link #map}, {@link #entrySet}, {@link #keySet},
* {@link #values} and {@link #confirmed} fields to full.
*/
public void resetFull() {
this.map = makeFullMap();
views();
this.confirmed = makeConfirmedMap();
Object[] k = getSampleKeys();
Object[] v = getSampleValues();
for (int i = 0; i < k.length; i++) {
confirmed.put(k[i], v[i]);
}
}
/**
* Resets the collection view fields.
*/
private void views() {
this.keySet = map.keySet();
this.values = map.values();
this.entrySet = map.entrySet();
}
/**
* Verifies that {@link #map} is still equal to {@link #confirmed}.
* This method checks that the map is equal to the HashMap,
* <I>and</I> that the map's collection views are still equal to
* the HashMap's collection views. An {@code equals} test
* is done on the maps and their collection views; their size and
* {@code isEmpty} results are compared; their hashCodes are
* compared; and {@code containsAll} tests are run on the
* collection views.
*/
public void verifyAll() {
verifyMap();
verifyEntrySet();
verifyKeySet();
verifyValues();
}
public void verifyMap() {
int size = confirmed.size();
boolean empty = confirmed.isEmpty();
assertEquals(size, map.size(), "Map should be same size as HashMap");
assertEquals(empty, map.isEmpty(), "Map should be empty if HashMap is");
assertEquals(confirmed.hashCode(), map.hashCode(), "hashCodes should be the same");
// this fails for LRUMap because confirmed.equals() somehow modifies
// map, causing concurrent modification exceptions.
//assertEquals("Map should still equal HashMap", confirmed, map);
// this works though and performs the same verification:
assertTrue(map.equals(confirmed), "Map should still equal HashMap");
// TODO: this should really be reexamined to figure out why LRU map
// behaves like it does (the equals shouldn't modify since all accesses
// by the confirmed collection should be through an iterator, thus not
// causing LRUMap to change).
}
public void verifyEntrySet() {
int size = confirmed.size();
boolean empty = confirmed.isEmpty();
assertEquals(size, entrySet.size(),
"entrySet should be same size as HashMap's\nTest: " + entrySet + "\nReal: " + confirmed.entrySet());
assertEquals(empty, entrySet.isEmpty(),
"entrySet should be empty if HashMap is\nTest: " + entrySet + "\nReal: " + confirmed.entrySet());
assertTrue(entrySet.containsAll(confirmed.entrySet()),
"entrySet should contain all HashMap's elements\nTest: " + entrySet + "\nReal: " + confirmed.entrySet());
assertEquals(confirmed.entrySet().hashCode(), entrySet.hashCode(),
"entrySet hashCodes should be the same\nTest: " + entrySet + "\nReal: " + confirmed.entrySet());
assertEquals(confirmed.entrySet(), entrySet,"Map's entry set should still equal HashMap's");
}
public void verifyKeySet() {
int size = confirmed.size();
boolean empty = confirmed.isEmpty();
assertEquals(size, keySet.size(),
"keySet should be same size as HashMap's\nTest: " + keySet + "\nReal: " + confirmed.keySet());
assertEquals(empty, keySet.isEmpty(),
"keySet should be empty if HashMap is\nTest: " + keySet + "\nReal: " + confirmed.keySet());
assertTrue(keySet.containsAll(confirmed.keySet()),
"keySet should contain all HashMap's elements\nTest: " + keySet + "\nReal: " + confirmed.keySet());
assertEquals(confirmed.keySet().hashCode(), keySet.hashCode(),
"keySet hashCodes should be the same\nTest: " + keySet + "\nReal: " + confirmed.keySet());
assertEquals(confirmed.keySet(), keySet, "Map's key set should still equal HashMap's");
}
public void verifyValues() {
List known = new ArrayList(confirmed.values());
List test = new ArrayList(values);
int size = confirmed.size();
boolean empty = confirmed.isEmpty();
assertEquals(size, values.size(), "values should be same size as HashMap's\nTest: " + test + "\nReal: " + known);
assertEquals(empty, values.isEmpty(), "values should be empty if HashMap is\nTest: " + test + "\nReal: " + known);
assertTrue(test.containsAll(known), "values should contain all HashMap's elements\nTest: " + test + "\nReal: " + known);
assertTrue(known.containsAll(test), "values should contain all HashMap's elements\nTest: " + test + "\nReal: " + known);
for (Object aKnown : known) {
boolean removed = test.remove(aKnown);
assertTrue(removed, "Map's values should still equal HashMap's");
}
assertTrue(test.isEmpty(), "Map's values should still equal HashMap's");
}
/**
* Erases any leftover instance variables by setting them to null.
*/
@AfterEach
public void tearDown() throws Exception {
map = null;
keySet = null;
entrySet = null;
values = null;
confirmed = null;
}
}