#590 - Add R2DBC EntityCallback example.

r2dbc/example/src/test/java/example/springdata/r2dbc/entitycallback/CustomerRepositoryIntegrationTests.java

@@ -0,0 +1,59 @@
+/*
+ * 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
+ *
+ *      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 example.springdata.r2dbc.entitycallback;
+
+import static org.assertj.core.api.Assertions.*;
+
+import reactor.test.StepVerifier;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.r2dbc.core.DatabaseClient;
+import org.springframework.test.context.junit4.SpringRunner;
+
+/**
+ * Integration test using {@link org.springframework.data.r2dbc.mapping.event.BeforeConvertCallback} to auto-generate an
+ * Id from a sequence.
+ *
+ * @author Mark Paluch
+ * @see ApplicationConfiguration#idGeneratingCallback(DatabaseClient)
+ */
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class CustomerRepositoryIntegrationTests {
+
+	@Autowired CustomerRepository customers;
+	@Autowired DatabaseClient database;
+
+	@Test
+	public void generatesIdOnInsert() throws IOException {
+
+		Customer dave = new Customer(null, "Dave", "Matthews");
+
+		this.customers.save(dave) //
+				.as(StepVerifier::create) //
+				.assertNext(actual -> {
+
+					assertThat(dave.getId()).isNull(); // immutable before save
+					assertThat(actual.getId()).isNotNull(); // after save
+				}).verifyComplete();
+	}
+}