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BAEL-2179 Java Map check if key exists (#5394) 

Add Unit test
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puneetd30 2018-10-06 15:13:10 +08:00 committed by Josh Cummings
parent cb6e84c59e
commit bed849289c
1 changed files with 44 additions and 0 deletions
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core-java-collections/src/test/java/com/baeldung/java/map/KeyCheckTest.java Normal file
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package com.baeldung.java.map;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.collections4.MultiMap;
import org.apache.commons.collections4.MultiMapUtils;
import org.apache.commons.collections4.MultiValuedMap;
import org.apache.commons.collections4.map.MultiValueMap;
import org.apache.commons.collections4.multimap.ArrayListValuedHashMap;
import org.apache.commons.collections4.multimap.HashSetValuedHashMap;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.TreeMultimap;
public class KeyCheckTest {
@Test
public void whenKeyIsPresent_thenContainsKeyReturnsTrue() {
Map<String, String> map = Collections.singletonMap("key", "value");
assertTrue(map.containsKey("key"));
assertFalse(map.containsKey("missing"));
}
@Test
public void whenKeyHasNullValue_thenGetStillWorks() {
Map<String, String> map = Collections.singletonMap("nothing", null);
assertTrue(map.containsKey("nothing"));
assertNull(map.get("nothing"));
}
}