Validate Cassandra defaults

See gh-25130

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/cassandra/CassandraPropertiesTest.java

+package org.springframework.boot.autoconfigure.cassandra;
+
+import com.datastax.oss.driver.api.core.config.OptionsMap;
+import com.datastax.oss.driver.api.core.config.TypedDriverOption;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link CassandraProperties}.
+ *
+ * @author Chris Bono
+ */
+class CassandraPropertiesTest {
+
+	@Test
+	void defaultValuesAreConsistent() {
+		CassandraProperties properties = new CassandraProperties();
+		OptionsMap optionsMap = OptionsMap.driverDefaults();
+
+		assertThat(properties.getConnection().getConnectTimeout())
+				.isEqualTo(optionsMap.get(TypedDriverOption.CONNECTION_CONNECT_TIMEOUT));
+
+		assertThat(properties.getConnection().getInitQueryTimeout())
+				.isEqualTo(optionsMap.get(TypedDriverOption.CONNECTION_INIT_QUERY_TIMEOUT));
+
+		assertThat(properties.getRequest().getTimeout()).isEqualTo(optionsMap.get(TypedDriverOption.REQUEST_TIMEOUT));
+
+		assertThat(properties.getRequest().getPageSize())
+				.isEqualTo(optionsMap.get(TypedDriverOption.REQUEST_PAGE_SIZE));
+
+		assertThat(properties.getRequest().getThrottler().getType().type())
+				.isEqualTo(optionsMap.get(TypedDriverOption.REQUEST_THROTTLER_CLASS));
+
+		assertThat(properties.getPool().getHeartbeatInterval())
+				.isEqualTo(optionsMap.get(TypedDriverOption.HEARTBEAT_INTERVAL));
+	}
+
+}