Add settingsprovider test

src/main/java/app/settings/SettingsProvider.java

@@ -19,7 +19,7 @@ public class SettingsProvider implements SettingsProviderI {
 
     private EventBus eventBus;
 
-    private String SETTINGS_PATH =
+    private String settingsPath =
       (System.getProperty("os.name").startsWith("Windows"))
       ? System.getProperty("user.home") + "\\AppData\\Roaming\\/BNNsettings.dat"
       : System.getProperty("user.home") + System.getProperty("file.separator") + ".BNNsettings.dat";
@@ -28,6 +28,12 @@ public class SettingsProvider implements SettingsProviderI {
        Arrays.asList("Java", "Markdown", "Monokai", "Solarized Light");
     
 
+    // Only for testing purposes
+    protected void setSettingsPath(String settingsPath) {
+      this.settingsPath = settingsPath;
+    }
+
+
     public SettingsProvider(EventBus eB) {
         setEventBus(eB);
         Model.setSettingsProvider(this);
@@ -41,7 +47,7 @@ public class SettingsProvider implements SettingsProviderI {
     @Override
     public void loadSettings() {
         List<String> settings = new ArrayList<>();
-        try (Scanner sc = new Scanner(new File(SETTINGS_PATH))) {
+        try (Scanner sc = new Scanner(new File(settingsPath))) {
 
             while (sc.hasNextLine()) {
                 var nextLine = sc.nextLine().trim();
@@ -69,7 +75,7 @@ public class SettingsProvider implements SettingsProviderI {
 
     @Override
     public void saveSettings() {
-        try (PrintWriter writer = new PrintWriter(new File(SETTINGS_PATH))) {
+        try (PrintWriter writer = new PrintWriter(new File(settingsPath))) {
             writer.println("- Settings:");
             writer.println("Programming Language = " + Model.getLanguage().getName());
             writer.println("Theme = " + Model.getTheme());

src/main/java/app/settings/SettingsProviderI.java

@@ -2,8 +2,14 @@ package app.settings;
 
 public interface SettingsProviderI {
 
+  /**
+   * Load settings from disk, and fire events to update the program state
+   */
   void loadSettings();
 
+  /**
+   * Save the state from {@link app.model.Model Model} to disk.
+   */
   void saveSettings();
 
 }

src/test/java/app/settings/SettingsProviderTest.java

@@ -1,53 +1,108 @@
 package app.settings;
 
-
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Paths;
-import java.util.Arrays;
-import java.util.List;
+import java.nio.file.StandardOpenOption;
 
 import com.google.common.eventbus.EventBus;
 
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.api.io.TempDir;
-import org.mockito.InjectMocks;
-import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
 
+import app.model.Model;
+import app.model.languages.Java;
+import app.model.languages.Markdown;
+
+@ExtendWith(MockitoExtension.class)
 public class SettingsProviderTest {
 
   @TempDir
   File tmp;
 
-  @Mock
-  private String SETTINGS_PATH = Paths.get(tmp.toPath().toString(), "BNNsetting.dat").toString();
+  private EventBus eventBus = new EventBus();
 
+  private SettingsProvider sp = new SettingsProvider(eventBus);
 
-  @Mock
-  private List<String> legalSettings = 
-       Arrays.asList("Java", "Markdown", "Monokai", "Solarized Light");
-  
-  private EventBus eventBus;
-
-
-  @InjectMocks
-  private SettingsProvider sp;
+  @BeforeEach
+  private void initializeSettingsPath() {
+    sp.setSettingsPath(Paths.get(tmp.toPath().toString(), "BNNsettings.dat").toString());
+  }
 
   @Test
-  @DisplayName("Test load settings")
+  @DisplayName("Test loadSettings with pre-existing settings file")
   public void testLoadSettings() throws IOException {
-    File f = new File(tmp, "test.txt");
+    File f = new File(tmp, "BNNsettings.dat");
     f.createNewFile();
     
+    Files.writeString(
+      f.toPath(),
+      "- Settings:\n"
+      + "Programming Language = Markdown\n"
+      + "Theme = Solarized Light",
+      StandardOpenOption.WRITE
+    );
+
+    sp.loadSettings();
+    assertTrue(Model.getLanguage() instanceof Markdown);
+    assertEquals("Solarized Light", Model.getTheme());
+  }
+
+  @Test
+  @DisplayName("Test loadSettings without pre-existing settings file")
+  public void testLoadSettingsWithoutFile() throws IOException {
+
+    sp.loadSettings();
+    assertTrue(Model.getLanguage() instanceof Java);
+    assertEquals("Monokai", Model.getTheme());
+  }
+
+  @Test
+  @DisplayName("Test loadSettings with broken settings file")
+  public void testLoadSettingsWithErrorFile() throws IOException {
+    File f = new File(tmp, "BNNsettings.dat");
+    f.createNewFile();
+    
+    Files.writeString(
+      f.toPath(),
+      "- Settings:\n"
+      + "Programming Language = Nonexisting Language\n"
+      + "Theme = Solarized Light",
+      StandardOpenOption.WRITE
+    );
+
+    sp.loadSettings();
+    assertTrue(Model.getLanguage() instanceof Java);
+    assertEquals("Monokai", Model.getTheme());
   }
 
   @Test
   @DisplayName("Test save settings")
   public void testSaveSettings() {
+    Model.setLanguage(new Markdown());
+    Model.setTheme("Solarized Light");
     
+    sp.saveSettings();
 
+    try {
+      assertEquals(
+        "- Settings:\n"
+        + "Programming Language = Markdown\n"
+        + "Theme = Solarized Light\n",
+        Files.readString(Paths.get(tmp.toString(), "BNNsettings.dat"))
+      );
+    } catch (IOException e) {
+      fail("Couldn't read settings file");
+    }
   }
     
 }