Add Docker Compose service connection support for Cassandra

Closes gh-35136

spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/cassandra/CassandraDockerComposeConnectionDetailsFactoryIntegrationTests.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2012-2023 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.boot.docker.compose.service.connection.cassandra;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.cassandra.CassandraConnectionDetails;
+import org.springframework.boot.autoconfigure.cassandra.CassandraConnectionDetails.Node;
+import org.springframework.boot.docker.compose.service.connection.test.AbstractDockerComposeIntegrationTests;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration test for {@link CassandraDockerComposeConnectionDetailsFactory}.
+ *
+ * @author Scott Frederick
+ */
+class CassandraDockerComposeConnectionDetailsFactoryIntegrationTests extends AbstractDockerComposeIntegrationTests {
+
+	CassandraDockerComposeConnectionDetailsFactoryIntegrationTests() {
+		super("cassandra-compose.yaml");
+	}
+
+	@Test
+	void runCreatesConnectionDetails() {
+		CassandraConnectionDetails connectionDetails = run(CassandraConnectionDetails.class);
+		List<Node> contactPoints = connectionDetails.getContactPoints();
+		assertThat(contactPoints.size()).isEqualTo(1);
+		Node node = contactPoints.get(0);
+		assertThat(node.host()).isNotNull();
+		assertThat(node.port()).isGreaterThan(0);
+		assertThat(connectionDetails.getUsername()).isNull();
+		assertThat(connectionDetails.getPassword()).isNull();
+		assertThat(connectionDetails.getLocalDatacenter()).isEqualTo("dc1");
+	}
+
+}

spring-boot-project/spring-boot-docker-compose/src/test/java/org/springframework/boot/docker/compose/service/connection/cassandra/CassandraEnvironmentTests.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2012-2023 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.boot.docker.compose.service.connection.cassandra;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link CassandraEnvironment}.
+ *
+ * @author Scott Frederick
+ */
+class CassandraEnvironmentTests {
+
+	@Test
+	void getDatacenterWhenDatacenterIsNotSet() {
+		CassandraEnvironment environment = new CassandraEnvironment(Collections.emptyMap());
+		assertThat(environment.getDatacenter()).isEqualTo("datacenter1");
+	}
+
+	@Test
+	void getDatacenterWhenDatacenterIsSet() {
+		CassandraEnvironment environment = new CassandraEnvironment(Map.of("CASSANDRA_DC", "dc1"));
+		assertThat(environment.getDatacenter()).isEqualTo("dc1");
+	}
+
+}

spring-boot-project/spring-boot-docker-compose/src/test/resources/org/springframework/boot/docker/compose/service/connection/cassandra/cassandra-compose.yaml

@@ -0,0 +1,7 @@
+services:
+  cassandra:
+    image: 'cassandra:3.11.10'
+    ports:
+      - '9042'
+    environment:
+      - 'CASSANDRA_DC=dc1'