Made some overall changes.

model-view-presenter/src/test/java/com/iluwatar/FileSelectorPresenterTest.java

@@ -0,0 +1,122 @@
+package com.iluwatar;
+
+import static org.junit.Assert.*;
+
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * This test case is responsible for testing our application
+ * by taking advantage of the Model-View-Controller architectural pattern.
+ */
+public class FileSelectorPresenterTest {
+	
+	/**
+	 * The Presenter component.
+	 */
+	private FileSelectorPresenter presenter;
+	
+	/**
+	 * The View component, implemented this time as a Stub!!!
+	 */
+	private FileSelectorStub stub;
+	
+	/**
+	 * The Model component.
+	 */
+	private FileLoader loader;
+	
+	
+	/**
+	 * Initializes the components of the test case.
+	 */
+	@Before
+	public void setUp() {
+		this.stub = new FileSelectorStub();
+		this.loader = new FileLoader();
+		presenter = new FileSelectorPresenter(this.stub);
+		presenter.setLoader(loader);
+	}
+	
+	/**
+	 * Tests if the Presenter was successfully connected with the View.
+	 */
+	@Test
+	public void wiring() {
+		presenter.start();
+		
+		assertNotNull(stub.getPresenter());
+		assertTrue(stub.isOpened());
+	}
+	
+	/**
+	 * Tests if the name of the file changes.
+	 */
+	@Test
+	public void updateFileNameToLoader() {
+		String EXPECTED_FILE = "Stamatis";
+		stub.setFileName(EXPECTED_FILE);
+		
+		presenter.start();
+		presenter.fileNameChanged();
+		
+		assertEquals(EXPECTED_FILE, loader.getFileName());
+	}
+	
+	/**
+	 * Tests if we receive a confirmation when we attempt to open a file
+	 * that it's name is null or an empty string.
+	 */
+	@Test
+	public void fileConfirmationWhenNameIsNull() {
+		stub.setFileName(null);
+		
+		presenter.start();
+		presenter.fileNameChanged();
+		presenter.confirmed();
+		
+		assertFalse(loader.isLoaded());
+		assertEquals(1, stub.getMessagesSent());
+	}
+	
+	/**
+	 * Tests if we receive a confirmation when we attempt to open a file
+	 * that it doesn't exist.
+	 */
+	@Test
+	public void fileConfirmationWhenFileDoesNotExist() {
+		stub.setFileName("RandomName.txt");
+		
+		presenter.start();
+		presenter.fileNameChanged();
+		presenter.confirmed();
+		
+		assertFalse(loader.isLoaded());
+		assertEquals(1, stub.getMessagesSent());
+	}
+	
+	/**
+	 * Tests if we can open the file, when it exists.
+	 */
+	@Test
+	public void fileConfirmationWhenFileExists() {
+		stub.setFileName("etc/data/test.txt");
+		presenter.start();
+		presenter.fileNameChanged();
+		presenter.confirmed();
+		
+		assertTrue(loader.isLoaded());
+		assertTrue(stub.dataDisplayed());
+	}
+	
+	/**
+	 * Tests if the view closes after cancellation.
+	 */
+	@Test
+	public void cancellation() {
+		presenter.start();
+		presenter.cancelled();
+		
+		assertFalse(stub.isOpened());
+	}
+}