Image test and variablescontroller tests added

src/test/java/_11/asktpk/artisanconnectbackend/ArtisanConnectBackendApplicationTests.java

@@ -71,8 +71,8 @@ class ArtisanConnectBackendApplicationTests {
         @AfterEach
         void cleanup() throws IOException {
             logger.info("Sprzątanie po teście - usuwanie katalogu testowego: {}", testDirectory);
-            Files.walk(testDirectory)
-                    .sorted(Comparator.reverseOrder())
+            try (var paths = Files.walk(testDirectory)) {
+                paths.sorted(Comparator.reverseOrder())
                         .forEach(path -> {
                             try {
                                 Files.delete(path);
@@ -82,6 +82,7 @@ class ArtisanConnectBackendApplicationTests {
                             }
                         });
             }
+        }
 
         @Test
         @DisplayName("Powinien poprawnie zapisać obraz w magazynie plików")