Mock the Map.forEach(:BiConsumer<K, V>) operation.

spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupport.java

@@ -67,6 +67,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.BiConsumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
@@ -2357,6 +2358,16 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 		}).when(mockRegion).containsValueForKey(any());
 
+		doAnswer(invocation -> {
+
+			BiConsumer<K, V> consumer = invocation.getArgument(0);
+
+			data.forEach(consumer);
+
+			return null;
+
+		}).when(mockRegion).forEach(any(BiConsumer.class));
+
 		// Region.get(key)
 		when(mockRegion.get(ArgumentMatchers.<K>any())).thenAnswer(invocation -> {
 

spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/MockRegionDataAccessOperationsAndEventsUnitTests.java

@@ -30,8 +30,10 @@ import static org.mockito.Mockito.verifyNoMoreInteractions;
 import static org.mockito.Mockito.when;
 import static org.springframework.data.gemfire.util.RuntimeExceptionFactory.newIllegalStateException;
 
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.junit.After;
@@ -545,4 +547,21 @@ public class MockRegionDataAccessOperationsAndEventsUnitTests {
 		assertThat(this.mockRegion.containsValueForKey(2)).isFalse();
 		assertThat(this.mockRegion.containsValueForKey(3)).isFalse();
 	}
+
+	@Test
+	public void mapForEachIsCorrect() {
+
+		Set<String> entryStrings = new HashSet<>(2);
+
+		assertThat(this.mockRegion).hasSize(0);
+
+		this.mockRegion.put(1, "TEST");
+		this.mockRegion.put(2, "MOCK");
+
+		assertThat(this.mockRegion).hasSize(2);
+
+		this.mockRegion.forEach((key, value) -> entryStrings.add(String.format("%1$s-%2$s", key, value)));
+
+		assertThat(entryStrings).containsExactlyInAnyOrder("1-TEST", "2-MOCK");
+	}
 }