added Method deleteTournament but not implemented yet in FileIO.java

added Test Methods for deleteTournament.

app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/FileIO.java

@@ -110,4 +110,9 @@ public class FileIO {
         }
 
     }
+
+    public void deleteTournament(File tournamentFile) throws IOException {
+        throw new UnsupportedOperationException("Method deleteTournament not implemented yet.");
+    }
+
 }

app/src/test/java/ch/zhaw/projekt2/turnierverwaltung/FileIOTest.java

@@ -83,7 +83,10 @@ class FileIOTest {
         @Test
         void loadTournamentNotExisting(){
             io = new FileIO(mainDir);
-            assertThrows(FileNotFoundException.class, () -> io.loadTournament(new File("Not-existing-File")));
+            File file = new File("Not-existing-File");
+            assertFalse(file.exists());
+            assertThrows(FileNotFoundException.class, () -> io.loadTournament(file));
+            assertFalse(file.exists());
         }
 
         @Test
@@ -124,4 +127,35 @@ class FileIOTest {
             assertThrows(IllegalArgumentException.class, () -> io.saveTournament(null));
         }
     }
+
+    @Nested
+    class Delete{
+        @BeforeEach
+        void setup(){
+            mainDir = RESOURCES_DIR + "FileIODelete";
+            io = new FileIO(mainDir);
+        }
+
+        @Test
+        void deleteTournament() throws IOException {
+            File file = new File(mainDir + "/saves/test1.txt");
+            file.createNewFile();
+            assertTrue(file.exists());
+            io.deleteTournament(file);
+            assertFalse(file.exists());
+        }
+
+        @Test
+        void deleteTournamentNotExisting() throws IOException {
+            File file = new File("Not-existing-File");
+            assertFalse(file.exists());
+            assertThrows(FileNotFoundException.class, () -> io.deleteTournament(file));
+            assertFalse(file.exists());
+        }
+
+        @Test
+        void deleteTournamentNull(){
+            assertThrows(IllegalArgumentException.class, () -> io.deleteTournament(null));
+        }
+    }
 }