#81 - Samples for new projection support for JPA and MongoDB.

mongodb/example/src/test/java/example/springdata/mongodb/projections/CustomerRepositoryIntegrationTest.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright 2015-2016 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.mongodb.projections;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+import java.util.Collection;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.projection.TargetAware;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * Integration tests for {@link CustomerRepository} to show projection capabilities.
+ * 
+ * @author Oliver Gierke
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration
+@Transactional
+public class CustomerRepositoryIntegrationTest {
+
+	@Configuration
+	@EnableAutoConfiguration
+	static class Config {}
+
+	@Autowired CustomerRepository customers;
+
+	Customer dave, carter;
+
+	@Before
+	public void setUp() {
+
+		customers.deleteAll();
+
+		this.dave = customers.save(new Customer("Dave", "Matthews"));
+		this.carter = customers.save(new Customer("Carter", "Beauford"));
+	}
+
+	@Test
+	public void projectsEntityIntoInterface() {
+
+		Collection<CustomerProjection> result = customers.findAllProjectedBy();
+
+		assertThat(result, hasSize(2));
+		assertThat(result.iterator().next().getFirstname(), is("Dave"));
+	}
+
+	@Test
+	public void projectsToDto() {
+
+		Collection<CustomerDto> result = customers.findAllDtoedBy();
+
+		assertThat(result, hasSize(2));
+		assertThat(result.iterator().next().getFirstname(), is("Dave"));
+	}
+
+	@Test
+	public void projectsDynamically() {
+
+		Collection<CustomerProjection> result = customers.findByFirstname("Dave", CustomerProjection.class);
+
+		assertThat(result, hasSize(1));
+		assertThat(result.iterator().next().getFirstname(), is("Dave"));
+	}
+
+	@Test
+	public void projectsIndividualDynamically() {
+
+		CustomerSummary result = customers.findProjectedById(dave.getId(), CustomerSummary.class);
+
+		assertThat(result, is(notNullValue()));
+		assertThat(result.getFullName(), is("Dave Matthews"));
+
+		// Proxy backed by original instance as the projection uses dynamic elements
+		assertThat(((TargetAware) result).getTarget(), is(instanceOf(Customer.class)));
+	}
+
+	@Test
+	public void projectIndividualInstance() {
+
+		CustomerProjection result = customers.findProjectedById(dave.getId());
+
+		assertThat(result, is(notNullValue()));
+		assertThat(result.getFirstname(), is("Dave"));
+		assertThat(((TargetAware) result).getTarget(), is(instanceOf(Customer.class)));
+	}
+}