diff --git a/Modules/Exercise03/Tests/Feature/Http/Controllers/ProductControllerTest.php b/Modules/Exercise03/Tests/Feature/Http/Controllers/ProductControllerTest.php
new file mode 100644
index 0000000..43e3bd9
--- /dev/null
+++ b/Modules/Exercise03/Tests/Feature/Http/Controllers/ProductControllerTest.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Modules\Exercise03\Tests\Feature\Http\Controllers;
+
+
+use Modules\Exercise03\Http\Controllers\ProductController;
+use Modules\Exercise03\Http\Requests\CheckoutRequest;
+use Modules\Exercise03\Models\Product;
+use Modules\Exercise03\Services\ProductService;
+use Tests\TestCase;
+
+class ProductControllerTest extends TestCase
+{
+    protected $productController;
+    protected $productService;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->productService = $this->mock(ProductService::class);
+        $this->productController = new ProductController($this->productService);
+    }
+
+    function test_it_index()
+    {
+        $this->productService->shouldReceive('getAllProducts')->andReturn([]);
+        $url = action([ProductController::class, 'index']);
+        $response = $this->get($url);
+        $response->assertViewIs('exercise03::index');
+        $response->assertViewHas('products');
+    }
+
+    function test_it_checkout(){
+        $input['total_products'] = [
+            Product::CRAVAT_TYPE => 1,
+            Product::WHITE_SHIRT_TYPE => 2,
+            Product::OTHER_TYPE => 3
+        ];
+
+        $this->productService->shouldReceive('calculateDiscount')->with($input)->andReturn(5);
+        $mockRequest = \Mockery::mock(CheckoutRequest::class);
+        $mockRequest->shouldReceive('input')->andReturn($input);
+        $response = $this->productController->checkout($mockRequest);
+        $this->assertEquals(['discount' => 5], $response->getOriginalContent());
+    }
+}
diff --git a/Modules/Exercise03/Tests/Feature/Http/Models/ProductModelTest.php b/Modules/Exercise03/Tests/Feature/Http/Models/ProductModelTest.php
new file mode 100644
index 0000000..cf65a25
--- /dev/null
+++ b/Modules/Exercise03/Tests/Feature/Http/Models/ProductModelTest.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Modules\Exercise03\Tests\Feature\Models;
+
+
+use Modules\Exercise03\Models\Product;
+use Tests\TestCase;
+
+class ProductModelTest extends TestCase
+{
+    public function test_product_new_factory()
+    {
+        $product = Product::factory()->make();
+
+        $this->assertInstanceOf(Product::class, $product);
+    }
+}
diff --git a/Modules/Exercise03/Tests/Feature/Http/Repositories/ProductRepositoryTest.php b/Modules/Exercise03/Tests/Feature/Http/Repositories/ProductRepositoryTest.php
new file mode 100644
index 0000000..253acb2
--- /dev/null
+++ b/Modules/Exercise03/Tests/Feature/Http/Repositories/ProductRepositoryTest.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Modules\Exercise03\Tests\Feature\Http\Repositories;
+
+use Illuminate\Support\Collection;
+use Modules\Exercise03\Models\Product;
+use Modules\Exercise03\Repositories\ProductRepository;
+use Tests\TestCase;
+
+class ProductRepositoryTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+    }
+
+    public function test_all()
+    {
+        $repository = new ProductRepository(new Product());
+        $getAll = $repository->all();
+        $this->assertInstanceOf(Collection::class, $getAll);
+    }
+}
diff --git a/Modules/Exercise03/Tests/Feature/Http/Requests/CheckoutRequestTest.php b/Modules/Exercise03/Tests/Feature/Http/Requests/CheckoutRequestTest.php
new file mode 100644
index 0000000..d653588
--- /dev/null
+++ b/Modules/Exercise03/Tests/Feature/Http/Requests/CheckoutRequestTest.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Modules\Exercise03\Tests\Feature\Http\Requests;
+
+
+use Illuminate\Support\Facades\Validator;
+use Modules\Exercise03\Http\Requests\CheckoutRequest;
+use Tests\TestCase;
+
+class CheckoutRequestTest extends TestCase
+{
+    private $request;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->request = new CheckoutRequest();
+    }
+
+    public function test_default_rules()
+    {
+        $request = new CheckoutRequest();
+
+        $this->assertEquals([
+            'total_products' => 'required|array',
+            'total_products.*' => 'nullable|integer|min:0'
+        ], $request->rules());
+    }
+
+    public function test_invalid_data()
+    {
+        $validator = Validator::make([], $this->request->rules());
+        $this->assertTrue($validator->fails());
+    }
+
+    public function test_valid_data()
+    {
+        $data = [
+            'total_products' => [0, 1, 2, 3],
+        ];
+
+        $validator = Validator::make($data, $this->request->rules());
+        $this->assertTrue($validator->passes());
+    }
+}
diff --git a/Modules/Exercise03/Tests/Feature/Http/Services/ProductServiceTest.php b/Modules/Exercise03/Tests/Feature/Http/Services/ProductServiceTest.php
new file mode 100644
index 0000000..d8949f9
--- /dev/null
+++ b/Modules/Exercise03/Tests/Feature/Http/Services/ProductServiceTest.php
@@ -0,0 +1,74 @@
+<?php
+
+namespace Modules\Exercise03\Tests\Feature\Http\Services;
+
+use InvalidArgumentException;
+use Modules\Exercise03\Models\Product;
+use Modules\Exercise03\Repositories\ProductRepository;
+use Modules\Exercise03\Services\ProductService;
+use Tests\TestCase;
+
+class ProductServiceTest extends TestCase
+{
+    protected $productRepository;
+    protected $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->productRepository = $this->mock(ProductRepository::class);
+        $this->service = new ProductService($this->productRepository);
+
+    }
+
+    public function test_get_all_products()
+    {
+        $this->productRepository->shouldReceive('all')
+            ->andReturn([]);
+        $products = $this->service->getAllProducts();
+
+        $this->assertEquals($products, []);
+    }
+
+    /**
+     * @param $totalProducts
+     * @param $expectedValue
+     * @dataProvider provide_total_products_data
+     * */
+    public function test_calculate_discount_with_valid_data($totalProducts, $expectedValue)
+    {
+        $discount = $this->service->calculateDiscount($totalProducts);
+        $this->assertEquals($expectedValue, $discount);
+    }
+
+    public function provide_total_products_data()
+    {
+        return [
+            [
+                [
+                    Product::CRAVAT_TYPE => 1,
+                    Product::WHITE_SHIRT_TYPE => 2,
+                    Product::OTHER_TYPE => 0,
+                ], ProductService::CRAVAT_WHITE_SHIRT_DISCOUNT
+            ],
+            [
+                [
+                    Product::CRAVAT_TYPE => 2,
+                    Product::WHITE_SHIRT_TYPE => 3,
+                    Product::OTHER_TYPE => 5,
+                ], 12
+            ],
+        ];
+    }
+
+    public function test_calculate_discount_throw_exception()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->service->calculateDiscount([
+            Product::CRAVAT_TYPE => -1,
+            Product::WHITE_SHIRT_TYPE => -2,
+            Product::OTHER_TYPE => -3,
+        ]);
+    }
+}
diff --git a/infection.json b/infection.json
index e93241b..bec3be1 100644
--- a/infection.json
+++ b/infection.json
@@ -1,7 +1,7 @@
 {
     "source": {
         "directories": [
-            "Modules/"
+            "Modules/Exercise03/"
         ],
         "excludes": [
             "Config",
diff --git a/phpunit.xml b/phpunit.xml
index 77442f0..3ac8815 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -6,9 +6,7 @@
 >
     <testsuites>
         <testsuite name="All">
-            <directory suffix="Test.php">./tests/Unit</directory>
-            <directory suffix="Test.php">./tests/Feature</directory>
-            <directory suffix="Test.php">./Modules/**/Tests</directory>
+            <directory suffix="Test.php">./Modules/Exercise03/Tests</directory>
         </testsuite>
         <testsuite name="Exercise01">
             <directory suffix="Test.php">./Modules/Exercise01/Tests</directory>
@@ -47,12 +45,7 @@
             <directory suffix=".php">./Modules</directory>
         </include>
         <exclude>
-            <directory>./Modules/**/Config</directory>
-            <directory>./Modules/**/Database</directory>
-            <directory>./Modules/**/Resources</directory>
-            <directory>./Modules/**/Routes</directory>
-            <directory>./Modules/**/Tests</directory>
-            <directory>./Modules/**/Providers</directory>
+            <directory suffix="Test.php">./Modules/Exercise03/Tests</directory>
         </exclude>
     </coverage>
     <php>