diff --git a/.gitignore b/.gitignore
index 93c7248..73fd4b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,7 @@ vendor
 build
 composer.phar
 composer.lock
-.phpunit.result.cache
+/.phpunit.cache
 report
 .DS_Store
 *.sublime-project
diff --git a/tests/IntegratedTest.php b/tests/IntegratedTest.php
index d2f438d..eed81ce 100644
--- a/tests/IntegratedTest.php
+++ b/tests/IntegratedTest.php
@@ -4,9 +4,9 @@
 
 use Illuminate\Support\Facades\Artisan;
 
-class IntegratedTest extends TestCase
+final class IntegratedTest extends TestCase
 {
-    public function test_new_package_is_created()
+    public function test_new_package_is_created(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
 
@@ -14,7 +14,7 @@ public function test_new_package_is_created()
         $this->assertTrue(is_dir(base_path('packages/MyVendor/MyPackage')));
     }
 
-    public function test_new_package_symlink_is_created()
+    public function test_new_package_symlink_is_created(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
 
@@ -28,7 +28,7 @@ public function test_new_package_symlink_is_created()
         $this->assertTrue(is_link(base_path('vendor/myvendor/mypackage')));
     }
 
-    public function test_new_package_is_installed()
+    public function test_new_package_is_installed(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
 
@@ -37,7 +37,7 @@ public function test_new_package_is_installed()
         $this->assertStringContainsString('MyVendor/MyPackage', $composer);
     }
 
-    public function test_new_package_studly_install()
+    public function test_new_package_studly_install(): void
     {
         Artisan::call('packager:new', ['vendor' => 'my-vendor', 'name' => 'my-package']);
 
@@ -46,14 +46,14 @@ public function test_new_package_studly_install()
         $this->assertTrue(is_file(base_path('packages/my-vendor/my-package/src/MyPackageServiceProvider.php')));
     }
 
-    public function test_new_package_name_should_be_valid()
+    public function test_new_package_name_should_be_valid(): void
     {
         Artisan::call('packager:new', ['vendor' => 'my-vendor', 'name' => '1234-Invalid']);
         $this->seeInConsoleOutput('Package was not created. Please choose a valid name.');
         $this->assertFalse(is_file(base_path('packages/my-vendor/4-Invalid/src/1234InvalidServiceProvider.php')));
     }
 
-    public function test_new_package_name_in_interactive_mode_should_be_valid()
+    public function test_new_package_name_in_interactive_mode_should_be_valid(): void
     {
         $this->artisan('packager:new', ['--i' => true])
             ->expectsQuestion('What will be the vendor name?', 'my-vendor')
@@ -64,14 +64,14 @@ public function test_new_package_name_in_interactive_mode_should_be_valid()
         $this->assertFalse(is_file(base_path('packages/my-vendor/4-Invalid/src/1234InvalidServiceProvider.php')));
     }
 
-    public function test_new_package_vendor_name_should_be_valid()
+    public function test_new_package_vendor_name_should_be_valid(): void
     {
         Artisan::call('packager:new', ['vendor' => '1234-invalid', 'name' => 'my-package']);
         $this->seeInConsoleOutput('Package was not created. Please choose a valid name.');
         $this->assertFalse(is_file(base_path('packages/1234-invalid/my-package/src/MyPackageServiceProvider.php')));
     }
 
-    public function test_new_package_vendor_name_in_interactive_mode_should_be_valid()
+    public function test_new_package_vendor_name_in_interactive_mode_should_be_valid(): void
     {
         $this->artisan('packager:new', ['--i' => true])
             ->expectsQuestion('What will be the vendor name?', '1234-invalid')
@@ -82,7 +82,7 @@ public function test_new_package_vendor_name_in_interactive_mode_should_be_valid
         $this->assertFalse(is_file(base_path('packages/my-vendor/4-Invalid/src/1234InvalidServiceProvider.php')));
     }
 
-    public function test_new_package_is_installed_from_custom_skeleton()
+    public function test_new_package_is_installed_from_custom_skeleton(): void
     {
         Artisan::call('packager:new', [
             'vendor' => 'AnotherVendor',
@@ -95,7 +95,7 @@ public function test_new_package_is_installed_from_custom_skeleton()
         $this->assertStringContainsString('AnotherVendor/AnotherPackage', $composer);
     }
 
-    public function test_get_package()
+    public function test_get_package(): void
     {
         Artisan::call('packager:get',
             ['url' => 'https://github.com/Jeroen-G/packager-skeleton', 'vendor' => 'MyVendor', 'name' => 'MyPackage']);
@@ -103,7 +103,7 @@ public function test_get_package()
         $this->seeInConsoleOutput('Package downloaded successfully!');
     }
 
-    public function test_get_existing_package_with_git()
+    public function test_get_existing_package_with_git(): void
     {
         Artisan::call('packager:git',
             ['url' => 'https://github.com/Seldaek/monolog', 'vendor' => 'monolog', 'name' => 'monolog']);
@@ -112,7 +112,7 @@ public function test_get_existing_package_with_git()
         $this->assertTrue(is_link(base_path('vendor/monolog/monolog')));
     }
 
-    public function test_get_existing_package_with_get()
+    public function test_get_existing_package_with_get(): void
     {
         Artisan::call('packager:get',
             ['url' => 'https://github.com/Seldaek/monolog', 'vendor' => 'monolog', 'name' => 'monolog', '--branch' => 'main']);
@@ -121,7 +121,7 @@ public function test_get_existing_package_with_get()
         $this->assertTrue(is_link(base_path('vendor/monolog/monolog')));
     }
 
-    public function test_list_packages()
+    public function test_list_packages(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
         Artisan::call('packager:list');
@@ -129,7 +129,7 @@ public function test_list_packages()
         $this->seeInConsoleOutput('MyVendor');
     }
 
-    public function test_removing_package()
+    public function test_removing_package(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
         $this->seeInConsoleOutput('MyVendor');
@@ -138,7 +138,7 @@ public function test_removing_package()
         $this->seeInConsoleOutput('Package removed successfully!');
     }
 
-    public function test_new_package_is_uninstalled()
+    public function test_new_package_is_uninstalled(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
         Artisan::call('packager:remove', ['vendor' => 'MyVendor', 'name' => 'MyPackage', '--no-interaction' => true]);
diff --git a/tests/SkeletonArchiveExtractorsTest.php b/tests/SkeletonArchiveExtractorsTest.php
index 15f2eee..e2459c0 100644
--- a/tests/SkeletonArchiveExtractorsTest.php
+++ b/tests/SkeletonArchiveExtractorsTest.php
@@ -5,9 +5,9 @@
 use Illuminate\Config\Repository;
 use Illuminate\Support\Facades\Artisan;
 
-class SkeletonArchiveExtractorsTest extends TestCase
+final class SkeletonArchiveExtractorsTest extends TestCase
 {
-    public function test_new_package_is_created_with_tar_gz_skeleton()
+    public function test_new_package_is_created_with_tar_gz_skeleton(): void
     {
         Artisan::call('packager:new', ['vendor' => 'MyVendor', 'name' => 'MyPackage']);
 
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 8c020e6..0e50346 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -27,7 +27,7 @@ protected function getBasePath()
     /**
      * Setup before each test.
      */
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->installTestApp();
         parent::setUp();
@@ -36,7 +36,7 @@ public function setUp(): void
     /**
      * Tear down after each test.
      */
-    public function tearDown(): void
+    protected function tearDown(): void
     {
         $this->uninstallTestApp();
         parent::tearDown();