Added tests for service-layer pattern

service-layer/src/test/java/com/iluwatar/servicelayer/common/BaseDaoTest.java

@@ -0,0 +1,123 @@
+package com.iluwatar.servicelayer.common;
+
+import com.iluwatar.servicelayer.hibernate.HibernateUtil;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Function;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+
+/**
+ * Date: 12/28/15 - 10:53 PM
+ *
+ * @author Jeroen Meulemeester
+ */
+public abstract class BaseDaoTest<E extends BaseEntity, D extends DaoBaseImpl<E>> {
+
+  /**
+   * The number of entities stored before each test
+   */
+  private static final int INITIAL_COUNT = 5;
+
+  /**
+   * The unique id generator, shared between all entities
+   */
+  private static final AtomicInteger ID_GENERATOR = new AtomicInteger();
+
+  /**
+   * Factory, used to create new entity instances with the given name
+   */
+  private final Function<String, E> factory;
+
+  /**
+   * The tested data access object
+   */
+  private final D dao;
+
+  /**
+   * Create a new test using the given factory and dao
+   *
+   * @param factory The factory, used to create new entity instances with the given name
+   * @param dao     The tested data access object
+   */
+  public BaseDaoTest(final Function<String, E> factory, final D dao) {
+    this.factory = factory;
+    this.dao = dao;
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    for (int i = 0; i < INITIAL_COUNT; i++) {
+      final String className = dao.persistentClass.getSimpleName();
+      final String entityName = String.format("%s%d", className, ID_GENERATOR.incrementAndGet());
+      this.dao.persist(this.factory.apply(entityName));
+    }
+  }
+
+  @After
+  public void tearDown() throws Exception {
+    HibernateUtil.dropSession();
+  }
+
+  protected final D getDao() {
+    return this.dao;
+  }
+
+  @Test
+  public void testFind() throws Exception {
+    final List<E> all = this.dao.findAll();
+    for (final E entity : all) {
+      final E byId = this.dao.find(entity.getId());
+      assertNotNull(byId);
+      assertEquals(byId.getId(), byId.getId());
+    }
+  }
+
+  @Test
+  public void testDelete() throws Exception {
+    final List<E> originalEntities = this.dao.findAll();
+    this.dao.delete(originalEntities.get(1));
+    this.dao.delete(originalEntities.get(2));
+
+    final List<E> entitiesLeft = this.dao.findAll();
+    assertNotNull(entitiesLeft);
+    assertEquals(INITIAL_COUNT - 2, entitiesLeft.size());
+  }
+
+  @Test
+  public void testFindAll() throws Exception {
+    final List<E> all = this.dao.findAll();
+    assertNotNull(all);
+    assertEquals(INITIAL_COUNT, all.size());
+  }
+
+  @Test
+  public void testSetId() throws Exception {
+    final E entity = this.factory.apply("name");
+    assertNull(entity.getId());
+
+    final Long expectedId = Long.valueOf(1);
+    entity.setId(expectedId);
+    assertEquals(expectedId, entity.getId());
+  }
+
+  @Test
+  public void testSetName() throws Exception {
+    final E entity = this.factory.apply("name");
+    assertEquals("name", entity.getName());
+    assertEquals("name", entity.toString());
+
+    final String expectedName = "new name";
+    entity.setName(expectedName);
+    assertEquals(expectedName, entity.getName());
+    assertEquals(expectedName, entity.toString());
+  }
+
+}