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Add class GuavaCollectionTypesTest

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DOHA 2014-10-30 00:14:10 +02:00
parent c180419d3a
commit 5202fd7a49
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guava/src/test/java/org/baeldung/guava/GuavaCollectionTypesTest.java Normal file
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package org.baeldung.guava;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.junit.Test;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.BiMap;
import com.google.common.collect.ClassToInstanceMap;
import com.google.common.collect.ContiguousSet;
import com.google.common.collect.DiscreteDomain;
import com.google.common.collect.HashBasedTable;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Multiset;
import com.google.common.collect.Multisets;
import com.google.common.collect.MutableClassToInstanceMap;
import com.google.common.collect.Ordering;
import com.google.common.collect.Range;
import com.google.common.collect.RangeSet;
import com.google.common.collect.Sets;
import com.google.common.collect.Table;
import com.google.common.collect.Tables;
import com.google.common.collect.TreeRangeSet;
public class GuavaCollectionTypesTest {
@Test
public void whenReverseList_thenReversed() {
final List<String> names = Lists.newArrayList("John", "Adam", "Jane");
names.add("Tom");
assertEquals(4, names.size());
final List<String> reversed = Lists.reverse(names);
assertThat(reversed, contains("Tom", "Jane", "Adam", "John"));
}
@Test
public void whenCreateCharacterListFromString_thenCreated() {
final List<Character> chars = Lists.charactersOf("John");
assertEquals(4, chars.size());
assertThat(chars, contains('J', 'o', 'h', 'n'));
}
@Test
public void whenCalculateUnion_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> union = Sets.union(first, second);
assertThat(union, containsInAnyOrder('a', 'b', 'c', 'd'));
}
@Test
public void whenCalculateSetsProduct_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b');
final Set<Character> second = ImmutableSet.of('c', 'd');
final Set<List<Character>> result = Sets.cartesianProduct(ImmutableList.of(first, second));
final Function<List<Character>, String> func = new Function<List<Character>, String>() {
@Override
public final String apply(final List<Character> input) {
return Joiner.on(" ").join(input);
}
};
final Iterable<String> joined = Iterables.transform(result, func);
assertThat(joined, containsInAnyOrder("a c", "a d", "b c", "b d"));
}
@Test
public void whenCreateRangeOfIntegersSet_thenCreated() {
final int start = 10;
final int end = 30;
final ContiguousSet<Integer> set = ContiguousSet.create(Range.closed(start, end), DiscreteDomain.integers());
assertEquals(21, set.size());
assertEquals(10, set.first().intValue());
assertEquals(30, set.last().intValue());
}
@Test
public void whenCreateRangeSet_thenCreated() {
final RangeSet<Integer> rangeSet = TreeRangeSet.create();
rangeSet.add(Range.closed(1, 10));
rangeSet.add(Range.closed(12, 15));
assertEquals(2, rangeSet.asRanges().size());
rangeSet.add(Range.closed(10, 12));
assertTrue(rangeSet.encloses(Range.closed(1, 15)));
assertEquals(1, rangeSet.asRanges().size());
}
@Test
public void whenInsertDuplicatesInMultiSet_thenInserted() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 3);
names.add("John");
assertEquals(2, names.count("John"));
names.remove("John");
assertEquals(1, names.count("John"));
assertEquals(3, names.count("Adam"));
names.remove("Adam", 2);
assertEquals(1, names.count("Adam"));
}
@Test
public void whenGetTopUsingMultiSet_thenCorrect() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 5);
names.add("Jane");
names.add("Tom", 2);
final Set<String> sorted = Multisets.copyHighestCountFirst(names).elementSet();
final List<String> topTwo = Lists.newArrayList(sorted).subList(0, 2);
assertEquals(2, topTwo.size());
assertEquals("Adam", topTwo.get(0));
assertEquals("Tom", topTwo.get(1));
}
@Test
public void whenCreateMap_thenCreated() {
final Map<String, Integer> salary = ImmutableMap.<String, Integer> builder().put("John", 1000).put("Jane", 1500).put("Adam", 2000).put("Tom", 2000).build();
assertEquals(1000, salary.get("John").intValue());
assertEquals(2000, salary.get("Tom").intValue());
}
@Test
public void whenUseSortedMap_thenKeysAreSorted() {
final ImmutableSortedMap<String, Integer> salary = new ImmutableSortedMap.Builder<String, Integer>(Ordering.natural()).put("John", 1000).put("Jane", 1500).put("Adam", 2000).put("Tom", 2000).build();
assertEquals("Adam", salary.firstKey());
assertEquals(2000, salary.lastEntry().getValue().intValue());
}
@Test
public void whenCreateBiMap_thenCreated() {
final BiMap<String, Integer> words = HashBiMap.create();
words.put("First", 1);
words.put("Second", 2);
words.put("Third", 3);
assertEquals(2, words.get("Second").intValue());
assertEquals("Third", words.inverse().get(3));
}
@Test
public void whenCreateMultimap_thenCreated() {
final Multimap<String, String> multimap = ArrayListMultimap.create();
multimap.put("fruit", "apple");
multimap.put("fruit", "banana");
multimap.put("pet", "cat");
multimap.put("pet", "dog");
assertThat(multimap.get("fruit"), containsInAnyOrder("apple", "banana"));
assertThat(multimap.get("pet"), containsInAnyOrder("cat", "dog"));
}
@Test
public void whenGroupListUsingMultimap_thenGrouped() {
final List<String> names = Lists.newArrayList("John", "Adam", "Tom");
final Function<String, Integer> function = new Function<String, Integer>() {
@Override
public final Integer apply(final String input) {
return input.length();
}
};
final Multimap<Integer, String> groups = Multimaps.index(names, function);
assertThat(groups.get(3), containsInAnyOrder("Tom"));
assertThat(groups.get(4), containsInAnyOrder("John", "Adam"));
}
@Test
public void whenCreateTable_thenCreated() {
final Table<String, String, Integer> distance = HashBasedTable.create();
distance.put("London", "Paris", 340);
distance.put("New York", "Los Angeles", 3940);
distance.put("London", "New York", 5576);
assertEquals(3940, distance.get("New York", "Los Angeles").intValue());
assertThat(distance.columnKeySet(), containsInAnyOrder("Paris", "New York", "Los Angeles"));
assertThat(distance.rowKeySet(), containsInAnyOrder("London", "New York"));
}
@Test
public void whenTransposeTable_thenCorrect() {
final Table<String, String, Integer> distance = HashBasedTable.create();
distance.put("London", "Paris", 340);
distance.put("New York", "Los Angeles", 3940);
distance.put("London", "New York", 5576);
final Table<String, String, Integer> transposed = Tables.transpose(distance);
assertThat(transposed.rowKeySet(), containsInAnyOrder("Paris", "New York", "Los Angeles"));
assertThat(transposed.columnKeySet(), containsInAnyOrder("London", "New York"));
}
@Test
public void whenCreateClassToInstanceMap_thenCreated() {
final ClassToInstanceMap<Number> numbers = MutableClassToInstanceMap.create();
numbers.putInstance(Integer.class, 1);
numbers.putInstance(Double.class, 1.5);
assertEquals(1, numbers.get(Integer.class));
assertEquals(1.5, numbers.get(Double.class));
}
}