Add comprehensive validation tests for Request class (#51)

- Add test for successful validation returning only validated data
- Add test for ValidationException with custom messages and attributes
- Improve test coverage for existing Request::validate behavior

Author: mohammadrasoulasghari

tests/Unit/RequestTest.php

@@ -2,6 +2,7 @@
 
 use Illuminate\Foundation\Auth\User;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Validation\ValidationException;
 use Laravel\Mcp\Request;
 
 it('may return all data', function (): void {
@@ -76,3 +77,40 @@
 
     expect($request->user())->toBeNull();
 });
+
+it('validates and returns only validated data on success', function (): void {
+    $request = new Request([
+        'email' => '[email protected]',
+        'extra' => 'keep out',
+    ]);
+
+    $validated = $request->validate([
+        'email' => 'required|email',
+    ]);
+
+    expect($validated)->toBe([
+        'email' => '[email protected]',
+    ]);
+});
+
+it('throws ValidationException with custom messages and attributes', function (): void {
+    $request = new Request([
+        'email' => 'not-an-email',
+    ]);
+
+    $messages = [
+        'email.email' => 'Please provide a valid :attribute.',
+    ];
+
+    $attributes = [
+        'email' => 'email address',
+    ];
+
+    $closure = function () use ($request, $messages, $attributes): void {
+        $request->validate([
+            'email' => 'required|email',
+        ], $messages, $attributes);
+    };
+
+    expect($closure)->toThrow(ValidationException::class);
+});