Minor refactorings and code style changes (iluwatar#807)

* Made minor changes in some patterns such as removed throws clause where not needed, changed incorrect order of arguments in assertEquals

* Minor refactorings and code style changes. 1) Removed several use of raw types 2) Removed unnecessary throws clauses 3) Used lambda expressions wherever applicable 4) Used apt assertion methods for readability 5) Use of try with resources wherever applicable 6) Corrected incorrect order of assertXXX arguments

* Removed unused import from Promise

* Addressed review comments

* Addressed checkstyle issue

abstract-document/src/test/java/com/iluwatar/abstractdocument/AbstractDocumentTest.java

@@ -32,6 +32,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * AbstractDocument test class
@@ -81,8 +82,8 @@ public void shouldIncludePropsInToString() {
     Map<String, Object> props = new HashMap<>();
     props.put(KEY, VALUE);
     DocumentImplementation document = new DocumentImplementation(props);
-    assertNotNull(document.toString().contains(KEY));
-    assertNotNull(document.toString().contains(VALUE));
+    assertTrue(document.toString().contains(KEY));
+    assertTrue(document.toString().contains(VALUE));
   }
 
 }

acyclic-visitor/src/test/java/com/iluwatar/acyclicvisitor/ConfigureForUnixVisitorTest.java

@@ -25,27 +25,19 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.groups.Tuple.tuple;
 import static uk.org.lidalia.slf4jext.Level.INFO;
-import static org.mockito.Mockito.mock;
 
-import uk.org.lidalia.slf4jtest.TestLogger;
-import uk.org.lidalia.slf4jtest.TestLoggerFactory;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 
-import com.iluwatar.acyclicvisitor.ConfigureForUnixVisitor;
-import com.iluwatar.acyclicvisitor.Hayes;
-import com.iluwatar.acyclicvisitor.HayesVisitor;
-import com.iluwatar.acyclicvisitor.Zoom;
-import com.iluwatar.acyclicvisitor.ZoomVisitor;
-
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.Assertions;
+import uk.org.lidalia.slf4jtest.TestLogger;
+import uk.org.lidalia.slf4jtest.TestLoggerFactory;
 
 /**
  * ConfigureForUnixVisitor test class
  */
 public class ConfigureForUnixVisitorTest {
 
-  TestLogger logger = TestLoggerFactory.getTestLogger(ConfigureForUnixVisitor.class);
+  private static final TestLogger LOGGER = TestLoggerFactory.getTestLogger(ConfigureForUnixVisitor.class);
 
   @AfterEach
   public void clearLoggers() {
@@ -59,7 +51,7 @@ public void testVisitForZoom() {
 
     conUnix.visit(zoom);
 
-    assertThat(logger.getLoggingEvents()).extracting("level", "message").contains(
+    assertThat(LOGGER.getLoggingEvents()).extracting("level", "message").contains(
         tuple(INFO, zoom + " used with Unix configurator."));
   }
 }

aggregator-microservices/inventory-microservice/src/test/java/com/iluwatar/inventory/microservice/InventoryControllerTest.java

@@ -31,7 +31,7 @@
  */
 public class InventoryControllerTest {
   @Test
-  public void testGetProductInventories() throws Exception {
+  public void testGetProductInventories() {
     InventoryController inventoryController = new InventoryController();
 
     int numberOfInventories = inventoryController.getProductInventories();

bridge/src/test/java/com/iluwatar/bridge/HammerTest.java

@@ -37,7 +37,7 @@ public class HammerTest extends WeaponTest {
    * underlying weapon implementation.
    */
   @Test
-  public void testHammer() throws Exception {
+  public void testHammer() {
     final Hammer hammer = spy(new Hammer(mock(FlyingEnchantment.class)));
     testBasicWeaponActions(hammer);
   }

bridge/src/test/java/com/iluwatar/bridge/SwordTest.java

@@ -37,7 +37,7 @@ public class SwordTest extends WeaponTest {
    * underlying weapon implementation.
    */
   @Test
-  public void testSword() throws Exception {
+  public void testSword() {
     final Sword sword = spy(new Sword(mock(FlyingEnchantment.class)));
     testBasicWeaponActions(sword);
   }

callback/src/main/java/com/iluwatar/callback/App.java

@@ -41,12 +41,7 @@ public class App {
    */
   public static void main(String[] args) {
     Task task = new SimpleTask();
-    Callback callback = new Callback() {
-      @Override
-      public void call() {
-        LOGGER.info("I'm done now.");
-      }
-    };
+    Callback callback = () -> LOGGER.info("I'm done now.");
     task.executeWith(callback);
   }
 }

callback/src/test/java/com/iluwatar/callback/CallbackTest.java

@@ -38,29 +38,6 @@ public class CallbackTest {
 
   @Test
   public void test() {
-    Callback callback = new Callback() {
-      @Override
-      public void call() {
-        callingCount++;
-      }
-    };
-
-    Task task = new SimpleTask();
-
-    assertEquals(new Integer(0), callingCount, "Initial calling count of 0");
-
-    task.executeWith(callback);
-
-    assertEquals(new Integer(1), callingCount, "Callback called once");
-
-    task.executeWith(callback);
-
-    assertEquals(new Integer(2), callingCount, "Callback called twice");
-
-  }
-
-  @Test
-  public void testWithLambdasExample() {
     Callback callback = () -> callingCount++;
 
     Task task = new SimpleTask();

chain/src/test/java/com/iluwatar/chain/OrcKingTest.java

@@ -43,7 +43,7 @@ public class OrcKingTest {
   };
 
   @Test
-  public void testMakeRequest() throws Exception {
+  public void testMakeRequest() {
     final OrcKing king = new OrcKing();
 
     for (final Request request : REQUESTS) {

collection-pipeline/src/main/java/com/iluwatar/collectionpipeline/Car.java

@@ -26,10 +26,10 @@
  * A Car class that has the properties of make, model, year and category.
  */
 public class Car {
-  private String make;
-  private String model;
-  private int year;
-  private Category category;
+  private final String make;
+  private final String model;
+  private final int year;
+  private final Category category;
 
   /**
    * Constructor to create an instance of car.

converter/src/test/java/com/iluwatar/converter/ConverterTest.java

@@ -71,7 +71,7 @@ public void testCustomConverter() {
         user.getFirstName().toLowerCase() + user.getLastName().toLowerCase() + "@whatever.com"));
     User u1 = new User("John", "Doe", false, "12324");
     UserDto userDto = converter.convertFromEntity(u1);
-    assertEquals(userDto.getEmail(), "[email protected]");
+    assertEquals("[email protected]", userDto.getEmail());
   }
 
   /**
@@ -83,6 +83,6 @@ public void testCollectionConversion() {
     ArrayList<User> users = Lists.newArrayList(new User("Camile", "Tough", false, "124sad"),
         new User("Marti", "Luther", true, "42309fd"), new User("Kate", "Smith", true, "if0243"));
     List<User> fromDtos = userConverter.createFromDtos(userConverter.createFromEntities(users));
-    assertEquals(fromDtos, users);
+    assertEquals(users, fromDtos);
   }
 }

cqrs/src/test/java/com/iluwatar/cqrs/IntegrationTest.java

@@ -96,7 +96,7 @@ public void testGetBook() {
   @Test
   public void testGetAuthorBooks() {
     List<Book> books = queryService.getAuthorBooks("username1");
-    assertTrue(books.size() == 2);
+    assertEquals(2, books.size());
     assertTrue(books.contains(new Book("title1", 10)));
     assertTrue(books.contains(new Book("new_title2", 30)));
   }

dao/src/test/java/com/iluwatar/dao/CustomerTest.java

@@ -88,13 +88,7 @@ public void equalsWithSameObjects() {
 
   @Test
   public void testToString() {
-    final StringBuffer buffer = new StringBuffer();
-    buffer.append("Customer{id=")
-            .append("" + customer.getId())
-            .append(", firstName='")
-            .append(customer.getFirstName())
-            .append("\', lastName='")
-            .append(customer.getLastName() + "\'}");
-    assertEquals(buffer.toString(), customer.toString());
+    assertEquals(String.format("Customer{id=%s, firstName='%s', lastName='%s'}",
+        customer.getId(), customer.getFirstName(), customer.getLastName()), customer.toString());
   }
 }

dao/src/test/java/com/iluwatar/dao/DbCustomerDaoTest.java

@@ -257,7 +257,7 @@ public void deleteSchema() throws SQLException {
 
   private void assertCustomerCountIs(int count) throws Exception {
     try (Stream<Customer> allCustomers = dao.getAll()) {
-      assertTrue(allCustomers.count() == count);
+      assertEquals(count, allCustomers.count());
     }
   }
 

dao/src/test/java/com/iluwatar/dao/InMemoryCustomerDaoTest.java

@@ -156,7 +156,7 @@ private int getNonExistingCustomerId() {
 
   private void assertCustomerCountIs(int count) throws Exception {
     try (Stream<Customer> allCustomers = dao.getAll()) {
-      assertTrue(allCustomers.count() == count);
+      assertEquals(count, allCustomers.count());
     }
   }
 }

data-mapper/src/test/java/com/iluwatar/datamapper/DataMapperTest.java

@@ -21,6 +21,7 @@
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 
 /**
  * The Data Mapper (DM) is a layer of software that separates the in-memory objects from the
@@ -43,27 +44,29 @@ public void testFirstDataMapper() {
     final StudentDataMapper mapper = new StudentDataMapperImpl();
 
     /* Create new student */
-    Student student = new Student(1, "Adam", 'A');
+    int studentId = 1;
+    Student student = new Student(studentId, "Adam", 'A');
 
     /* Add student in respectibe db */
     mapper.insert(student);
 
     /* Check if student is added in db */
-    assertEquals(student.getStudentId(), mapper.find(student.getStudentId()).get().getStudentId());
+    assertEquals(studentId, mapper.find(student.getStudentId()).get().getStudentId());
 
     /* Update existing student object */
-    student = new Student(student.getStudentId(), "AdamUpdated", 'A');
+    String updatedName = "AdamUpdated";
+    student = new Student(student.getStudentId(), updatedName, 'A');
 
     /* Update student in respectibe db */
     mapper.update(student);
 
     /* Check if student is updated in db */
-    assertEquals(mapper.find(student.getStudentId()).get().getName(), "AdamUpdated");
+    assertEquals(updatedName, mapper.find(student.getStudentId()).get().getName());
 
     /* Delete student in db */
     mapper.delete(student);
 
     /* Result should be false */
-    assertEquals(false, mapper.find(student.getStudentId()).isPresent());
+    assertFalse(mapper.find(student.getStudentId()).isPresent());
   }
 }

data-mapper/src/test/java/com/iluwatar/datamapper/StudentTest.java

@@ -20,36 +20,37 @@
 
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * Tests {@link Student}.
  */
 public final class StudentTest {
 
-  @Test
   /**
    * This API tests the equality behaviour of Student object
    * Object Equality should work as per logic defined in equals method
    *
    * @throws Exception if any execution error during test
    */
+  @Test
   public void testEquality() throws Exception {
 
     /* Create some students */
     final Student firstStudent = new Student(1, "Adam", 'A');
     final Student secondStudent = new Student(2, "Donald", 'B');
     final Student secondSameStudent = new Student(2, "Donald", 'B');
-    final Student firstSameStudent = firstStudent;
 
     /* Check equals functionality: should return 'true' */
-    assertTrue(firstStudent.equals(firstSameStudent));
+    assertEquals(firstStudent, firstStudent);
 
     /* Check equals functionality: should return 'false' */
-    assertFalse(firstStudent.equals(secondStudent));
+    assertNotEquals(firstStudent, secondStudent);
 
     /* Check equals functionality: should return 'true' */
-    assertTrue(secondStudent.equals(secondSameStudent));
+    assertEquals(secondStudent, secondSameStudent);
   }
 }

data-transfer-object/src/test/java/com/iluwatar/datatransfer/CustomerResourceTest.java

@@ -30,6 +30,7 @@
 import java.util.List;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 /**
  * tests {@link CustomerResource}.
@@ -45,10 +46,10 @@ public void shouldGetAllCustomers() {
 
     List<CustomerDto> allCustomers = customerResource.getAllCustomers();
 
-    assertEquals(allCustomers.size(), 1);
-    assertEquals(allCustomers.get(0).getId(), "1");
-    assertEquals(allCustomers.get(0).getFirstName(), "Melody");
-    assertEquals(allCustomers.get(0).getLastName(), "Yates");
+    assertEquals(1, allCustomers.size());
+    assertEquals("1", allCustomers.get(0).getId());
+    assertEquals("Melody", allCustomers.get(0).getFirstName());
+    assertEquals("Yates", allCustomers.get(0).getLastName());
   }
 
   @Test
@@ -59,9 +60,9 @@ public void shouldSaveCustomer() {
     customerResource.save(customer);
 
     List<CustomerDto> allCustomers = customerResource.getAllCustomers();
-    assertEquals(allCustomers.get(0).getId(), "1");
-    assertEquals(allCustomers.get(0).getFirstName(), "Rita");
-    assertEquals(allCustomers.get(0).getLastName(), "Reynolds");
+    assertEquals("1", allCustomers.get(0).getId());
+    assertEquals("Rita", allCustomers.get(0).getFirstName());
+    assertEquals("Reynolds", allCustomers.get(0).getLastName());
   }
 
   @Test
@@ -75,7 +76,7 @@ public void shouldDeleteCustomer() {
     customerResource.delete(customer.getId());
 
     List<CustomerDto> allCustomers = customerResource.getAllCustomers();
-    assertEquals(allCustomers.size(), 0);
+    assertTrue(allCustomers.isEmpty());
   }
 
 }

delegation/src/main/java/com/iluwatar/delegation/simple/App.java

@@ -40,7 +40,7 @@
  */
 public class App {
 
-  public static final String MESSAGE_TO_PRINT = "hello world";
+  private static final String MESSAGE_TO_PRINT = "hello world";
 
   /**
    * Program entry point

dirty-flag/src/test/java/org/dirty/flag/DirtyFlagTest.java

@@ -22,6 +22,7 @@
  */
 package org.dirty.flag;
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.util.List;
@@ -41,7 +42,7 @@ public class DirtyFlagTest {
   public void testIsDirty() {
     DataFetcher df = new DataFetcher();
     List<String> countries = df.fetch();
-    assertTrue(!countries.isEmpty());
+    assertFalse(countries.isEmpty());
   }
 
   @Test

eip-aggregator/src/main/java/com/iluwatar/eip/aggregator/routes/AggregatorRoute.java

@@ -51,7 +51,7 @@ public class AggregatorRoute extends RouteBuilder {
    * @throws Exception in case of exception during configuration
    */
   @Override
-  public void configure() throws Exception {
+  public void configure() {
     // Main route
     from("{{entry}}").aggregate(constant(true), aggregator)
         .completionSize(3).completionInterval(2000)

eip-message-channel/src/main/java/com/iluwatar/eip/message/channel/App.java

@@ -70,7 +70,7 @@ public void configure() throws Exception {
     });
 
     context.start();
-    context.getRoutes().stream().forEach(r -> LOGGER.info(r.toString()));
+    context.getRoutes().forEach(r -> LOGGER.info(r.toString()));
     context.stop();
   }
 }

eip-publish-subscribe/src/main/java/com/iluwatar/eip/publish/subscribe/App.java

@@ -65,7 +65,7 @@ public void configure() throws Exception {
     });
     ProducerTemplate template = context.createProducerTemplate();
     context.start();
-    context.getRoutes().stream().forEach(r -> LOGGER.info(r.toString()));
+    context.getRoutes().forEach(r -> LOGGER.info(r.toString()));
     template.sendBody("direct:origin", "Hello from origin");
     context.stop();
   }