Introduce the MemberSuspectEvent class extends MembershipEvent to signal when a peer member of the distributd system (cluster) becomes suspect.

A peer member of the distributed system (cluster) becomse suspect when it is no longer responsive to other peer members in the cluster.

apache-geode-extensions/src/test/java/org/springframework/geode/distributed/event/support/MemberSuspectEventUnitTests.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package org.springframework.geode.distributed.event.support;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyNoInteractions;
+
+import org.junit.Test;
+
+import org.apache.geode.distributed.DistributedMember;
+import org.apache.geode.distributed.internal.DistributionManager;
+
+import org.springframework.geode.distributed.event.MembershipEvent;
+
+/**
+ * Unit Tests for {@link MemberSuspectEvent}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.apache.geode.distributed.DistributedMember
+ * @see org.springframework.geode.distributed.event.MembershipEvent
+ * @see org.springframework.geode.distributed.event.support.MemberSuspectEvent
+ * @since 1.3.0
+ */
+public class MemberSuspectEventUnitTests {
+
+	@Test
+	public void constructsMemberSuspectEvent() {
+
+		DistributionManager mockDistributionManager = mock(DistributionManager.class);
+
+		MemberSuspectEvent event = new MemberSuspectEvent(mockDistributionManager);
+
+		assertThat(event).isNotNull();
+		assertThat(event.getDistributionManager()).isEqualTo(mockDistributionManager);
+		assertThat(event.getReason().orElse(null)).isNull();
+		assertThat(event.getSuspectMember().orElse(null)).isNull();
+		assertThat(event.getType()).isEqualTo(MembershipEvent.Type.MEMBER_SUSPECT);
+
+		verifyNoInteractions(mockDistributionManager);
+	}
+
+	@Test
+	public void setAndGetReason() {
+
+		DistributionManager mockDistributionManager = mock(DistributionManager.class);
+
+		MemberSuspectEvent event = new MemberSuspectEvent(mockDistributionManager);
+
+		assertThat(event).isNotNull();
+		assertThat(event.getReason().orElse(null)).isNull();
+		assertThat(event.withReason("TEST")).isSameAs(event);
+		assertThat(event.getReason().orElse(null)).isEqualTo("TEST");
+		assertThat(event.withReason(null)).isSameAs(event);
+		assertThat(event.getReason().orElse(null)).isNull();
+		assertThat(event.withReason("  ")).isSameAs(event);
+		assertThat(event.getReason().orElse(null)).isEqualTo("  ");
+		assertThat(event.withReason(null)).isSameAs(event);
+		assertThat(event.getReason().orElse(null)).isNull();
+		assertThat(event.withReason("")).isSameAs(event);
+		assertThat(event.getReason().orElse(null)).isEqualTo("");
+	}
+
+	@Test
+	public void setAndGetSuspectMember() {
+
+		DistributedMember mockDistributedMember = mock(DistributedMember.class);
+
+		DistributionManager mockDistributionManager = mock(DistributionManager.class);
+
+		MemberSuspectEvent event = new MemberSuspectEvent(mockDistributionManager);
+
+		assertThat(event).isNotNull();
+		assertThat(event.getSuspectMember().orElse(null)).isNull();
+		assertThat(event.withSuspect(mockDistributedMember)).isSameAs(event);
+		assertThat(event.getSuspectMember().orElse(null)).isEqualTo(mockDistributedMember);
+		assertThat(event.withSuspect(null)).isSameAs(event);
+		assertThat(event.getSuspectMember().orElse(null)).isNull();
+	}
+}