diff --git a/spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupport.java b/spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupport.java
index 6cb6d05..b8e582f 100644
--- a/spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupport.java
+++ b/spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupport.java
@@ -2551,6 +2551,7 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 			.when(mockRegion).containsValue(any());
 
 		// Region.containsValueForKey(key)
+		// NOTE: This containsValueForKey(..) operation is not atomic
 		doAnswer(invocation -> {
 
 			K key = invocation.getArgument(0);
@@ -2608,6 +2609,7 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 		}).when(mockRegion).get(ArgumentMatchers.<K>any());
 
 		// Region.getAll(:Collection<K>)
+		// NOTE: This getAll(..) operation is not atomic
 		doAnswer(invocation -> {
 
 			Collection<K> keys = invocation.getArgument(0);
@@ -2752,6 +2754,7 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 		}).when(mockRegion).put(any(), any());
 
 		// Map.putAll(:Map<K, V>) / Region.putAll(:Map<K, V>)
+		// NOTE: This putAll(..) operation is not atomic
 		doAnswer(invocation -> {
 
 			Map<K, V> map = invocation.getArgument(0);
@@ -2763,6 +2766,8 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 		}).when(mockRegion).putAll(any(Map.class));
 
+		// TODO Map.putIfAbsent(key, value) / Region.putIfAbsent(key, value) ???
+
 		// Map.remove(key) / Region.remove(key)
 		doAnswer(invocation -> {
 
@@ -2798,7 +2803,10 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 		}).when(mockRegion).remove(any());
 
+		// TODO Map.remove(key, value) / Region.remove(key, value) ???
+
 		// Region.removeAll(:Collection<K>)
+		// NOTE: This removeAll(..) implementation is not atomic
 		doAnswer(invocation -> {
 
 			Collection<K> keys = invocation.getArgument(0);
@@ -2811,8 +2819,15 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 		}).when(mockRegion).removeAll(any(Collection.class));
 
+		// TODO Map.replace(key, value) / Region.replace(key, value) ???
+		// TODO Map.replace(key, oldValue, newValue) / Region.replace(key, oldValue, newValue) ???
+		// TODO Map.replaceAll(:BiFunction<K, V) ???
+
 		// Region.size()
 		doAnswer(invocation -> data.size()).when(mockRegion).size();
+
+		// Map.values() / Region.values()
+		doAnswer(invocation -> Collections.unmodifiableCollection(data.values())).when(mockRegion).values();
 	}
 
 	public static <K, V> Region<K, V> mockSubRegion(Region<K, V> parent, String name,
diff --git a/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/MockRegionDataAccessOperationsAndEventsUnitTests.java b/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/MockRegionDataAccessOperationsAndEventsUnitTests.java
index 72d1737..ce50d52 100644
--- a/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/MockRegionDataAccessOperationsAndEventsUnitTests.java
+++ b/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/MockRegionDataAccessOperationsAndEventsUnitTests.java
@@ -34,6 +34,7 @@ import static org.mockito.Mockito.when;
 import static org.springframework.data.gemfire.util.RuntimeExceptionFactory.newIllegalStateException;
 
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
@@ -748,4 +749,40 @@ public class MockRegionDataAccessOperationsAndEventsUnitTests {
 		verify(this.mockRegion, times(1)).remove(eq(2));
 		verify(this.mockRegion, never()).remove(eq(3));
 	}
+
+	@Test
+	public void mapRegionValuesIsCorrect() {
+
+		this.mockRegion.put(1, "TEST");
+		this.mockRegion.put(2, "MOCK");
+		this.mockRegion.put(3, "NULL");
+
+		Collection<Object> values = this.mockRegion.values();
+
+		assertThat(values).isNotNull();
+		assertThat(values).hasSize(3);
+		assertThat(values).containsExactlyInAnyOrder("TEST", "MOCK", "NULL");
+
+		this.mockRegion.put(3, "THREE");
+		this.mockRegion.put(4, "FOUR");
+
+		values = this.mockRegion.values();
+
+		assertThat(values).isNotNull();
+		assertThat(values).hasSize(4);
+		assertThat(values).containsExactlyInAnyOrder("TEST", "MOCK", "THREE", "FOUR");
+
+		this.mockRegion.removeAll(Arrays.asList(3, 4));
+
+		values = this.mockRegion.values();
+
+		assertThat(values).isNotNull();
+		assertThat(values).hasSize(2);
+		assertThat(values).containsExactlyInAnyOrder("TEST", "MOCK");
+	}
+
+	@Test(expected = UnsupportedOperationException.class)
+	public void mapRegionValuesIsUnmodifiable() {
+		this.mockRegion.values().add("TEST");
+	}
 }