Add unit test for cassandra health checker

See gh-15583

Author: OleksiiBondar

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/cassandra/CassandraHealthIndicatorTests.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2012-2018 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
+ *
+ *      http://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.boot.actuate.cassandra;
+
+import com.datastax.driver.core.ResultSet;
+import com.datastax.driver.core.Row;
+import com.datastax.driver.core.querybuilder.Select;
+import org.junit.Test;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Status;
+import org.springframework.data.cassandra.core.CassandraOperations;
+import org.springframework.data.cassandra.core.cql.CqlOperations;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link CassandraHealthIndicator}.
+ *
+ * @author Oleksii Bondar
+ */
+
+public class CassandraHealthIndicatorTests {
+
+	@Test(expected = IllegalArgumentException.class)
+	public void throwsExceptionOnNullCassandraOperations() {
+		new CassandraHealthIndicator(null);
+	}
+
+	@Test
+	public void verifyHealthStatusWhenExhausted() {
+		CassandraOperations cassandraOperations = mock(CassandraOperations.class);
+		CqlOperations cqlOperations = mock(CqlOperations.class);
+		ResultSet resultSet = mock(ResultSet.class);
+		CassandraHealthIndicator healthIndicator = new CassandraHealthIndicator(
+				cassandraOperations);
+		given(cassandraOperations.getCqlOperations()).willReturn(cqlOperations);
+		given(cqlOperations.queryForResultSet(any(Select.class))).willReturn(resultSet);
+		given(resultSet.isExhausted()).willReturn(true);
+
+		Health health = healthIndicator.health();
+
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+	}
+
+	@Test
+	public void verifyHealthStatusWithVersion() {
+		CassandraOperations cassandraOperations = mock(CassandraOperations.class);
+		CqlOperations cqlOperations = mock(CqlOperations.class);
+		ResultSet resultSet = mock(ResultSet.class);
+		Row row = mock(Row.class);
+		CassandraHealthIndicator healthIndicator = new CassandraHealthIndicator(
+				cassandraOperations);
+		given(cassandraOperations.getCqlOperations()).willReturn(cqlOperations);
+		given(cqlOperations.queryForResultSet(any(Select.class))).willReturn(resultSet);
+		given(resultSet.isExhausted()).willReturn(false);
+		given(resultSet.one()).willReturn(row);
+		String expectedVersion = "1.0.0";
+		given(row.getString(0)).willReturn(expectedVersion);
+
+		Health health = healthIndicator.health();
+
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+		assertThat(health.getDetails().get("version")).isEqualTo(expectedVersion);
+	}
+
+}