Add simple tests for delegate pattern #324

delegation/pom.xml

@@ -41,5 +41,11 @@
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.github.stefanbirkner</groupId>
+            <artifactId>system-rules</artifactId>
+            <version>1.14.0</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

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

@@ -1,10 +1,10 @@
 package com.iluwatar.delegation.simple;
 
-public abstract class Controller<T extends Printer> {
+public abstract class AbstractPrinterController<T extends Printer> implements Printer{
 
     private Printer printer;
 
-    public Controller(Printer printer) {
+    public AbstractPrinterController(Printer printer) {
         this.printer = printer;
     }
 

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

@@ -1,6 +1,6 @@
 package com.iluwatar.delegation.simple;
 
-public class PrinterController extends Controller implements Printer {
+public class PrinterController extends AbstractPrinterController {
 
     public PrinterController(Printer printer) {
         super(printer);

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

@@ -1,6 +1,6 @@
 package com.iluwatar.delegation.simple.printers;
 
-import com.iluwatar.delegation.simple.Printer;
+import com.iluwatar.delegation.simple.AbstractPrinterController;
 import com.iluwatar.delegation.simple.PrinterController;
 
 public class App {
@@ -8,13 +8,9 @@ public class App {
     public static final String MESSAGE_TO_PRINT = "hello world";
 
     public static void main(String[] args) {
-        Printer hpPrinter = new HPPrinter();
+        AbstractPrinterController hpPrinterController = new PrinterController(new HPPrinter());
-        Printer canonPrinter = new CanonPrinter();
+        AbstractPrinterController canonPrinterController = new PrinterController(new CanonPrinter());
-        Printer epsonPrinter = new EpsonPrinter();
+        AbstractPrinterController epsonPrinterController = new PrinterController(new EpsonPrinter());
-
-        PrinterController hpPrinterController = new PrinterController(hpPrinter);
-        PrinterController canonPrinterController = new PrinterController(canonPrinter);
-        PrinterController epsonPrinterController = new PrinterController(epsonPrinter);
 
         hpPrinterController.print(MESSAGE_TO_PRINT);
         canonPrinterController.print(MESSAGE_TO_PRINT);

delegation/src/test/java/com/iluwatar/delegation/simple/DelegateTest.java

@@ -0,0 +1,43 @@
+package com.iluwatar.delegation.simple;
+
+import com.iluwatar.delegation.simple.printers.CanonPrinter;
+import com.iluwatar.delegation.simple.printers.EpsonPrinter;
+import com.iluwatar.delegation.simple.printers.HPPrinter;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.contrib.java.lang.system.SystemOutRule;
+
+import static org.junit.Assert.assertEquals;
+
+public class DelegateTest {
+
+    private static final String MESSAGE = "Test Message Printed";
+
+    @Rule
+    public final SystemOutRule systemOutRule = new SystemOutRule().enableLog();
+
+    @Test
+    public void testCanonPrinter() throws Exception {
+        AbstractPrinterController abstractController = new PrinterController(new CanonPrinter());
+        abstractController.print(MESSAGE);
+
+        assertEquals("Canon Printer : Test Message Printed\n", systemOutRule.getLog());
+    }
+
+    @Test
+    public void testHPPrinter() throws Exception {
+        AbstractPrinterController abstractController = new PrinterController(new HPPrinter());
+        abstractController.print(MESSAGE);
+
+        assertEquals("HP Printer : Test Message Printed\n", systemOutRule.getLog());
+    }
+
+    @Test
+    public void testEpsonPrinter() throws Exception {
+        AbstractPrinterController abstractController = new PrinterController(new EpsonPrinter());
+        abstractController.print(MESSAGE);
+
+        assertEquals("Epson Printer : Test Message Printed\n", systemOutRule.getLog());
+    }
+
+}