Split or move java-collections-maps module (#7802)
This commit is contained in:
Catalin Burcea
committed by
Josh Cummings
Josh Cummings
parent
ee9f90ab2f
commit
f4b4a9eea5
@@ -0,0 +1,336 @@
|
||||
package com.baeldung.map;
|
||||
|
||||
import org.junit.Test;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.util.*;
|
||||
import java.util.Map.Entry;
|
||||
|
||||
import static org.junit.Assert.*;
|
||||
|
||||
public class MapUnitTest {
|
||||
private static final Logger LOG = LoggerFactory.getLogger(MapUnitTest.class);
|
||||
|
||||
|
||||
@Test
|
||||
public void givenHashMap_whenRetrievesKeyset_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
Set<String> keys = map.keySet();
|
||||
|
||||
assertEquals(2, keys.size());
|
||||
assertTrue(keys.contains("name"));
|
||||
assertTrue(keys.contains("type"));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenHashMap_whenRetrievesValues_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
Collection<String> values = map.values();
|
||||
|
||||
assertEquals(2, values.size());
|
||||
assertTrue(values.contains("baeldung"));
|
||||
assertTrue(values.contains("blog"));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenHashMap_whenRetrievesEntries_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
Set<Entry<String, String>> entries = map.entrySet();
|
||||
|
||||
assertEquals(2, entries.size());
|
||||
for (Entry<String, String> e : entries) {
|
||||
String key = e.getKey();
|
||||
String val = e.getValue();
|
||||
assertTrue(key.equals("name") || key.equals("type"));
|
||||
assertTrue(val.equals("baeldung") || val.equals("blog"));
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenKeySet_whenChangeReflectsInMap_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
assertEquals(2, map.size());
|
||||
|
||||
Set<String> keys = map.keySet();
|
||||
|
||||
keys.remove("name");
|
||||
assertEquals(1, map.size());
|
||||
}
|
||||
|
||||
@Test(expected = ConcurrentModificationException.class)
|
||||
public void givenIterator_whenFailsFastOnModification_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
Set<String> keys = map.keySet();
|
||||
Iterator<String> it = keys.iterator();
|
||||
map.remove("type");
|
||||
while (it.hasNext()) {
|
||||
String key = it.next();
|
||||
}
|
||||
}
|
||||
|
||||
public void givenIterator_whenRemoveWorks_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("name", "baeldung");
|
||||
map.put("type", "blog");
|
||||
|
||||
Set<String> keys = map.keySet();
|
||||
Iterator<String> it = keys.iterator();
|
||||
while (it.hasNext()) {
|
||||
it.next();
|
||||
it.remove();
|
||||
}
|
||||
assertEquals(0, map.size());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenHashCodeIsCalledOnPut_thenCorrect() {
|
||||
MyKey key = new MyKey(1, "name");
|
||||
Map<MyKey, String> map = new HashMap<>();
|
||||
map.put(key, "val");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenHashCodeIsCalledOnGet_thenCorrect() {
|
||||
MyKey key = new MyKey(1, "name");
|
||||
Map<MyKey, String> map = new HashMap<>();
|
||||
map.put(key, "val");
|
||||
map.get(key);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenGetWorks_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("key", "val");
|
||||
|
||||
String val = map.get("key");
|
||||
|
||||
assertEquals("val", val);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenNewKey_whenPutReturnsNull_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
|
||||
String rtnVal = map.put("key1", "val1");
|
||||
|
||||
assertNull(rtnVal);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenUnmappedKey_whenGetReturnsNull_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
|
||||
String rtnVal = map.get("key1");
|
||||
|
||||
assertNull(rtnVal);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenNullVal_whenPutReturnsNull_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
|
||||
String rtnVal = map.put("key1", null);
|
||||
|
||||
assertNull(rtnVal);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenNullKeyAndVal_whenAccepts_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
|
||||
map.put(null, null);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenNullVal_whenRetrieves_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("key", null);
|
||||
|
||||
String val = map.get("key");
|
||||
|
||||
assertNull(val);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenContainsDistinguishesNullValues_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
|
||||
String val1 = map.get("key");
|
||||
boolean valPresent = map.containsKey("key");
|
||||
|
||||
assertNull(val1);
|
||||
assertFalse(valPresent);
|
||||
|
||||
map.put("key", null);
|
||||
String val = map.get("key");
|
||||
valPresent = map.containsKey("key");
|
||||
|
||||
assertNull(val);
|
||||
assertTrue(valPresent);
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenPutReturnsPrevValue_thenCorrect() {
|
||||
Map<String, String> map = new HashMap<>();
|
||||
map.put("key1", "val1");
|
||||
String rtnVal = map.put("key1", "val2");
|
||||
|
||||
assertEquals("val1", rtnVal);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void whenCallsEqualsOnCollision_thenCorrect() {
|
||||
HashMap<MyKey, String> map = new HashMap<>();
|
||||
MyKey k1 = new MyKey(1, "firstKey");
|
||||
MyKey k2 = new MyKey(2, "secondKey");
|
||||
MyKey k3 = new MyKey(2, "thirdKey");
|
||||
|
||||
LOG.debug("storing value for k1");
|
||||
map.put(k1, "firstValue");
|
||||
|
||||
LOG.debug("storing value for k2");
|
||||
map.put(k2, "secondValue");
|
||||
|
||||
LOG.debug("storing value for k3");
|
||||
map.put(k3, "thirdValue");
|
||||
|
||||
LOG.debug("retrieving value for k1");
|
||||
String v1 = map.get(k1);
|
||||
|
||||
LOG.debug("retrieving value for k2");
|
||||
String v2 = map.get(k2);
|
||||
|
||||
LOG.debug("retrieving value for k3");
|
||||
String v3 = map.get(k3);
|
||||
|
||||
assertEquals("firstValue", v1);
|
||||
assertEquals("secondValue", v2);
|
||||
assertEquals("thirdValue", v3);
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenLinkedHashMap_whenGetsOrderedKeyset_thenCorrect() {
|
||||
LinkedHashMap<Integer, String> map = new LinkedHashMap<>();
|
||||
map.put(1, null);
|
||||
map.put(2, null);
|
||||
map.put(3, null);
|
||||
map.put(4, null);
|
||||
map.put(5, null);
|
||||
Set<Integer> keys = map.keySet();
|
||||
Integer[] arr = keys.toArray(new Integer[0]);
|
||||
for (int i = 0; i < arr.length; i++) {
|
||||
assertEquals(new Integer(i + 1), arr[i]);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenLinkedHashMap_whenAccessOrderWorks_thenCorrect() {
|
||||
LinkedHashMap<Integer, String> map = new LinkedHashMap<>(16, .75f, true);
|
||||
map.put(1, null);
|
||||
map.put(2, null);
|
||||
map.put(3, null);
|
||||
map.put(4, null);
|
||||
map.put(5, null);
|
||||
Set<Integer> keys = map.keySet();
|
||||
assertEquals("[1, 2, 3, 4, 5]", keys.toString());
|
||||
map.get(4);
|
||||
assertEquals("[1, 2, 3, 5, 4]", keys.toString());
|
||||
map.get(1);
|
||||
assertEquals("[2, 3, 5, 4, 1]", keys.toString());
|
||||
map.get(3);
|
||||
assertEquals("[2, 5, 4, 1, 3]", keys.toString());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenLinkedHashMap_whenRemovesEldestEntry_thenCorrect() {
|
||||
LinkedHashMap<Integer, String> map = new MyLinkedHashMap<>(16, .75f, true);
|
||||
map.put(1, null);
|
||||
map.put(2, null);
|
||||
map.put(3, null);
|
||||
map.put(4, null);
|
||||
map.put(5, null);
|
||||
Set<Integer> keys = map.keySet();
|
||||
assertEquals("[1, 2, 3, 4, 5]", keys.toString());
|
||||
map.put(6, null);
|
||||
assertEquals("[2, 3, 4, 5, 6]", keys.toString());
|
||||
map.put(7, null);
|
||||
assertEquals("[3, 4, 5, 6, 7]", keys.toString());
|
||||
map.put(8, null);
|
||||
assertEquals("[4, 5, 6, 7, 8]", keys.toString());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenTreeMap_whenOrdersEntriesNaturally_thenCorrect() {
|
||||
TreeMap<Integer, String> map = new TreeMap<>();
|
||||
map.put(3, "val");
|
||||
map.put(2, "val");
|
||||
map.put(1, "val");
|
||||
map.put(5, "val");
|
||||
map.put(4, "val");
|
||||
assertEquals("[1, 2, 3, 4, 5]", map.keySet().toString());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenTreeMap_whenOrdersEntriesNaturally_thenCorrect2() {
|
||||
TreeMap<String, String> map = new TreeMap<>();
|
||||
map.put("c", "val");
|
||||
map.put("b", "val");
|
||||
map.put("a", "val");
|
||||
map.put("e", "val");
|
||||
map.put("d", "val");
|
||||
|
||||
assertEquals("[a, b, c, d, e]", map.keySet().toString());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenTreeMap_whenOrdersEntriesByComparator_thenCorrect() {
|
||||
TreeMap<Integer, String> map = new TreeMap<>(Comparator.reverseOrder());
|
||||
map.put(3, "val");
|
||||
map.put(2, "val");
|
||||
map.put(1, "val");
|
||||
map.put(5, "val");
|
||||
map.put(4, "val");
|
||||
|
||||
assertEquals("[5, 4, 3, 2, 1]", map.keySet().toString());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void givenTreeMap_whenPerformsQueries_thenCorrect() {
|
||||
TreeMap<Integer, String> map = new TreeMap<>();
|
||||
map.put(3, "val");
|
||||
map.put(2, "val");
|
||||
map.put(1, "val");
|
||||
map.put(5, "val");
|
||||
map.put(4, "val");
|
||||
|
||||
Integer highestKey = map.lastKey();
|
||||
Integer lowestKey = map.firstKey();
|
||||
Set<Integer> keysLessThan3 = map.headMap(3).keySet();
|
||||
Set<Integer> keysGreaterThanEqTo3 = map.tailMap(3).keySet();
|
||||
|
||||
assertEquals(new Integer(5), highestKey);
|
||||
assertEquals(new Integer(1), lowestKey);
|
||||
assertEquals("[1, 2]", keysLessThan3.toString());
|
||||
assertEquals("[3, 4, 5]", keysGreaterThanEqTo3.toString());
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user