Merge pull request #66 from Doha2012/master

Modify Class GuavaCollectionTypesTest

guava/src/test/java/org/baeldung/guava/GuavaCollectionTypesTest.java

@@ -14,6 +14,7 @@ import org.junit.Test;
 
 import com.google.common.base.Function;
 import com.google.common.base.Joiner;
+import com.google.common.base.Predicates;
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.BiMap;
 import com.google.common.collect.ClassToInstanceMap;
@@ -90,6 +91,26 @@ public class GuavaCollectionTypesTest {
         assertThat(result, contains('h', 'e', 'l', 'o'));
     }
 
+    @Test
+    public void whenRemoveNullFromList_thenRemoved() {
+        final List<String> names = Lists.newArrayList("John", null, "Adam", null, "Jane");
+        Iterables.removeIf(names, Predicates.isNull());
+
+        assertEquals(3, names.size());
+        assertThat(names, contains("John", "Adam", "Jane"));
+    }
+
+    @Test
+    public void whenCreateImmutableList_thenCreated() {
+        final List<String> names = Lists.newArrayList("John", "Adam", "Jane");
+
+        names.add("Tom");
+        assertEquals(4, names.size());
+
+        final ImmutableList<String> immutable = ImmutableList.copyOf(names);
+        assertThat(immutable, contains("John", "Adam", "Jane", "Tom"));
+    }
+
     @Test
     public void whenCalculateUnion_thenCorrect() {
         final Set<Character> first = ImmutableSet.of('a', 'b', 'c');