refactor: Resolved issue #2979 Refactor Front Controller (#2986)

Co-authored-by: Mayankchoudhary294 <mayankchoudhary4302@example.com>

front-controller/src/test/java/com/iluwatar/front/controller/DispatcherTest.java

@@ -0,0 +1,91 @@
+/*
+ * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
+ *
+ * The MIT License
+ * Copyright © 2014-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.front.controller;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+class DispatcherTest {
+
+  private Dispatcher dispatcher;
+
+  @BeforeEach
+  public void setUp() {
+    dispatcher = new Dispatcher();
+  }
+
+  @Test
+  void testDispatchKnownCommand() {
+    Command mockCommand = mock(ArcherCommand.class);
+    dispatcher = spy(dispatcher);
+    doReturn(mockCommand).when(dispatcher).getCommand("Archer");
+
+    dispatcher.dispatch("Archer");
+
+    verify(mockCommand, times(1)).process();
+  }
+
+  @Test
+  void testDispatchUnknownCommand() {
+    Command mockCommand = mock(UnknownCommand.class);
+    dispatcher = spy(dispatcher);
+    doReturn(mockCommand).when(dispatcher).getCommand("Unknown");
+
+    dispatcher.dispatch("Unknown");
+
+    verify(mockCommand, times(1)).process();
+  }
+
+  @Test
+  void testGetCommandKnown() {
+    Command command = dispatcher.getCommand("Archer");
+    assertNotNull(command);
+    assertTrue(command instanceof ArcherCommand);
+  }
+
+  @Test
+  void testGetCommandUnknown() {
+    Command command = dispatcher.getCommand("Unknown");
+    assertNotNull(command);
+    assertTrue(command instanceof UnknownCommand);
+  }
+
+  @Test
+  void testGetCommandClassKnown() {
+    Class<?> commandClass = Dispatcher.getCommandClass("Archer");
+    assertNotNull(commandClass);
+    assertEquals(ArcherCommand.class, commandClass);
+  }
+
+  @Test
+  void testGetCommandClassUnknown() {
+    Class<?> commandClass = Dispatcher.getCommandClass("Unknown");
+    assertNotNull(commandClass);
+    assertEquals(UnknownCommand.class, commandClass);
+  }
+}