### Changes

Fixes #3: Error on DBI when files or folders contains special characters.

### Additional changes
* Added unit and feature tests
* Fix file size display
* Run tests on CI/CD
* Publish docker image on release

www/tests/Unit/NintendoFileExtensionTest.php

@@ -0,0 +1,29 @@
+<?php
+
+use App\Enums\NintendoFileExtension;
+
+test('values() returns all four supported extensions', function () {
+    expect(NintendoFileExtension::values())->toBe(['nsp', 'nsz', 'xci', 'xcz']);
+});
+
+test('isSupported() returns true for each supported extension', function (string $filename) {
+    expect(NintendoFileExtension::isSupported($filename))->toBeTrue();
+})->with(['game.nsp', 'game.nsz', 'game.xci', 'game.xcz']);
+
+test('isSupported() is case-insensitive', function (string $filename) {
+    expect(NintendoFileExtension::isSupported($filename))->toBeTrue();
+})->with(['game.NSP', 'game.NSZ', 'game.XCI', 'game.XCZ', 'game.Nsp', 'game.Xci']);
+
+test('isSupported() returns false for unsupported extensions', function (string $filename) {
+    expect(NintendoFileExtension::isSupported($filename))->toBeFalse();
+})->with(['game.txt', 'game.exe', 'game.zip', 'game.iso', 'game.php', 'game.rom']);
+
+test('isSupported() returns false for files without an extension', function () {
+    expect(NintendoFileExtension::isSupported('gamefile'))->toBeFalse();
+});
+
+test('isSupported() works with paths containing directory separators', function () {
+    expect(NintendoFileExtension::isSupported('folder/game.nsp'))->toBeTrue();
+    expect(NintendoFileExtension::isSupported('folder/sub/game.xci'))->toBeTrue();
+    expect(NintendoFileExtension::isSupported('folder/game.txt'))->toBeFalse();
+});