diff --git a/tests/Examples/some/deep/nesting/NestingTest.php b/tests/Examples/some/deep/nesting/NestingTest.php
index ab44d70..6180959 100644
--- a/tests/Examples/some/deep/nesting/NestingTest.php
+++ b/tests/Examples/some/deep/nesting/NestingTest.php
@@ -1,5 +1,11 @@
 <?php
 
-it('is true')
-    ->expect(fn () => true)
-    ->toBeTrue();
+use PHPUnit\Framework\TestCase;
+
+class NestingTest extends TestCase
+{
+    public function testIsTrue(): void
+    {
+        $this->assertTrue(true);
+    }
+}
diff --git a/tests/Feature/UserTest.php b/tests/Feature/UserTest.php
index c9ca67f..c7d55ba 100644
--- a/tests/Feature/UserTest.php
+++ b/tests/Feature/UserTest.php
@@ -1,52 +1,78 @@
 <?php
 
-/**
- * @var mixed $this
- */
-
+use PHPUnit\Framework\TestCase;
 use TestProject\User;
 
-uses()->group('file group');
+/**
+ * @group file-group
+ */
+class UserTest extends TestCase
+{
+    private User $sut;
 
-$makeUser = fn () => new User(18, 'John');
+    protected function setUp(): void
+    {
+        $this->sut = new User(18, 'John');
+    }
 
-beforeEach(function () use ($makeUser) {
-    $this->sut = $makeUser();
-});
+    public function testClassConstructor(): void
+    {
+        $user = new User(18, 'John');
+        $this->assertSame('John', $user->name);
+        $this->assertSame(18, $user->age);
+        $this->assertEmpty($user->favorite_movies);
+    }
 
-test('class constructor')
-    ->expect($makeUser)
-    ->name->toBe('John')
-    ->age->toBe(18)
-    ->favorite_movies->toBeEmpty();
+    /**
+     * @group special-tests
+     */
+    public function testTellName(): void
+    {
+        $this->assertIsString($this->sut->tellName());
+        $this->assertStringContainsString('John', $this->sut->tellName());
+    }
 
-test('tellName', function () {
-    expect($this->sut)
-        ->tellName()->toBeString()->toContain('John');
-})
-    ->group('special tests');
+    public function testThrows(): void
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('oops!');
+        throw new \Exception('oops!');
+    }
 
-it('throws', function () {
-    throw new \Exception('oops!');
-});
+    public function testIsSkipped(): void
+    {
+        $this->markTestSkipped('Skipped to mirror Pest test.');
+    }
 
-it('is skipped')->skip();
+    public function testCanTellAge(): void
+    {
+        $user = new User(18, 'John');
+        $this->assertIsString($user->tellAge());
+        $this->assertStringContainsString('18', $user->tellAge());
+    }
 
-it('can tellAge')
-    ->expect($makeUser)
-    ->tellAge()->toBeString()->toContain('18');
+    public function testIsFalse(): void
+    {
+        // Mirrors the original failing expectation in Pest
+        $this->assertFalse(true);
+    }
 
-it('is false')->expect(true)->toBeFalse();
+    public function testAddFavoriteMovie(): void
+    {
+        $user = new User(18, 'John');
+        $this->assertTrue($user->addFavoriteMovie('Avengers'));
+        $this->assertContains('Avengers', $user->favorite_movies);
+        $this->assertCount(1, $user->favorite_movies);
+    }
 
-test('addFavoriteMovie')
-    ->expect($makeUser)
-    ->addFavoriteMovie('Avengers')
-    ->toBeTrue()
-    ->favorite_movies->toContain('Avengers')->toHaveLength(1);
+    public function testRemoveFavoriteMovie(): void
+    {
+        $user = new User(18, 'John');
+        $this->assertTrue($user->addFavoriteMovie('Avengers'));
+        $this->assertTrue($user->addFavoriteMovie('Justice League'));
+        $this->assertTrue($user->removeFavoriteMovie('Avengers'));
+        $this->assertNotContains('Avengers', $user->favorite_movies);
+        $this->assertCount(1, $user->favorite_movies);
+    }
+}
 
-test('removeFavoriteMovie')
-    ->expect($makeUser)
-    ->addFavoriteMovie('Avengers')->toBeTrue()
-    ->addFavoriteMovie('Justice League')->toBeTrue()
-    ->removeFavoriteMovie('Avengers')->toBeTrue()
-    ->favorite_movies->not->toContain('Avengers')->toHaveLength(1);
diff --git a/tests/Pest.php b/tests/Pest.php
deleted file mode 100644
index 5949c61..0000000
--- a/tests/Pest.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/*
-|--------------------------------------------------------------------------
-| Test Case
-|--------------------------------------------------------------------------
-|
-| The closure you provide to your test functions is always bound to a specific PHPUnit test
-| case class. By default, that class is "PHPUnit\Framework\TestCase". Of course, you may
-| need to change it using the "uses()" function to bind a different classes or traits.
-|
-*/
-
-// uses(Tests\TestCase::class)->in('Feature');
-
-/*
-|--------------------------------------------------------------------------
-| Expectations
-|--------------------------------------------------------------------------
-|
-| When you're writing tests, you often need to check that values meet certain conditions. The
-| "expect()" function gives you access to a set of "expectations" methods that you can use
-| to assert different things. Of course, you may extend the Expectation API at any time.
-|
-*/
-
-expect()->extend('toBeOne', function () {
-    return $this->toBe(1);
-});
-
-/*
-|--------------------------------------------------------------------------
-| Functions
-|--------------------------------------------------------------------------
-|
-| While Pest is very powerful out-of-the-box, you may have some testing code specific to your
-| project that you don't want to repeat in every file. Here you can also expose helpers as
-| global functions to help you to reduce the number of lines of code in your test files.
-|
-*/
-
-function something()
-{
-    // ..
-}
diff --git a/tests/Unit/ExampleTest.php b/tests/Unit/ExampleTest.php
index 7739dd4..b8cd89d 100644
--- a/tests/Unit/ExampleTest.php
+++ b/tests/Unit/ExampleTest.php
@@ -1,9 +1,16 @@
 <?php
 
-test('example', function () {
-    expect(true)->toBeTrue();
-});
+use PHPUnit\Framework\TestCase;
 
-test("double quote example", function() {
-    expect(true)->toBeTrue();
-});
+class ExampleTest extends TestCase
+{
+    public function testExample(): void
+    {
+        $this->assertTrue(true);
+    }
+
+    public function testDoubleQuoteExample(): void
+    {
+        $this->assertTrue(true);
+    }
+}