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 7d0fab7..d5eb5fd 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
@@ -623,7 +623,7 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 				int lastIndexOfRegionSeparator = it.lastIndexOf(Region.SEPARATOR);
 
-				return lastIndexOfRegionSeparator < 0 ? it : it.substring(lastIndexOfRegionSeparator);
+				return lastIndexOfRegionSeparator < 0 ? it : it.substring(lastIndexOfRegionSeparator + 1);
 			})
 			.filter(it -> !it.isEmpty())
 			.orElseThrow(() -> newIllegalArgumentException("Region name [%s] is required", regionName));
@@ -2777,6 +2777,8 @@ public abstract class GemFireMockObjectsSupport extends MockObjectsSupport {
 
 		Region<K, V> mockSubRegion = mockRegion(parent.getRegionService(), subRegionName, regionAttributes);
 
+		doReturn(parent).when(mockSubRegion).getParentRegion();
+
 		parent.subregions(false).add(mockSubRegion);
 
 		return mockSubRegion;
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 db57f08..b462ce1 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
@@ -465,7 +465,7 @@ public class MockRegionDataAccessOperationsAndEventsUnitTests {
 
 	@Test
 	@SuppressWarnings("all")
-	public void mockingPutIfAbsentWorksAsExpected() {
+	public void mockingUnsupportedPutIfAbsentWorksAsExpected() {
 
 		doAnswer(invocation -> {
 
diff --git a/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupportUnitTests.java b/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupportUnitTests.java
index b32d64a..ed40dfb 100644
--- a/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupportUnitTests.java
+++ b/spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/mock/GemFireMockObjectsSupportUnitTests.java
@@ -17,6 +17,7 @@ package org.springframework.data.gemfire.tests.mock;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -119,6 +120,26 @@ public class GemFireMockObjectsSupportUnitTests {
 		assertThat(mockClientSubscriptionConfig.getEvictionPolicy()).isEqualTo("entry");
 	}
 
+	@Test
+	@SuppressWarnings({ "rawtypes", "unchecked" })
+	public void mockSubRegionIsCorrect() {
+
+		Region mockRegion = mock(Region.class);
+
+		doReturn("MockRegion").when(mockRegion).getName();
+		doReturn("/MockRegion").when(mockRegion).getFullPath();
+
+		RegionAttributes mockRegionAttributes = mock(RegionAttributes.class);
+
+		Region mockSubRegion = GemFireMockObjectsSupport.mockSubRegion(mockRegion, "MockSubRegion",
+			mockRegionAttributes);
+
+		assertThat(mockSubRegion).isNotNull();
+		assertThat(mockSubRegion.getName()).isEqualTo("MockSubRegion");
+		assertThat(mockSubRegion.getFullPath()).isEqualTo("/MockRegion/MockSubRegion");
+		assertThat(mockSubRegion.getParentRegion()).isEqualTo(mockRegion);
+	}
+
 	@Test
 	public void regionAttributesMutatorGetRegionReturnsRegion() {