add assertions

src/FakePdf.php

@@ -2,14 +2,43 @@
 
 namespace Spatie\LaravelPdf;
 
+use Closure;
+use Illuminate\Http\Response;
 use PHPUnit\Framework\Assert;
 
 class FakePdf extends Pdf
 {
+    /** @var array<int, \Spatie\LaravelPdf\Pdf> */
+    protected array $respondedWithPdf = [];
+
     public function assertViewIs(string $viewName): self
     {
         Assert::assertEquals($viewName, $this->viewName);
 
         return $this;
     }
+
+    public function toResponse($request): Response
+    {
+        $this->respondedWithPdf[] = $this;
+
+        return new Response();
+    }
+
+    public function assertRespondedWithPdf(Closure $expectations): void
+    {
+        Assert::assertNotEmpty($this->respondedWithPdf);
+
+        foreach($this->respondedWithPdf as $pdf) {
+
+            $result = $expectations($pdf);
+
+            if ($result === true) {
+                return;
+            }
+
+        }
+
+        Assert::fail('Did not respond with a PDF that matched the expectations');
+    }
 }

src/Pdf.php

@@ -312,6 +312,24 @@ protected function hasHeader(string $headerName): bool
     {
         return array_key_exists($headerName, $this->responseHeaders);
     }
+
+    public function isInline(): bool
+    {
+        if (! $this->hasHeader('Content-Disposition')) {
+            return false;
+        }
+
+        return str_contains($this->responseHeaders['Content-Disposition'], 'inline');
+    }
+
+    public function isDownload(): bool
+    {
+        if (! $this->hasHeader('Content-Disposition')) {
+            return false;
+        }
+
+        return str_contains($this->responseHeaders['Content-Disposition'], 'attachment');
+    }
 }
 
 /*

tests/FakePdfTest.php

@@ -1,6 +1,8 @@
 <?php
 
+use Illuminate\Support\Facades\Route;
 use Spatie\LaravelPdf\Facades\Pdf;
+use function \Spatie\LaravelPdf\Support\pdf;
 
 it('can determine the view that was used', function () {
     Pdf::fake();
@@ -9,3 +11,20 @@
 
     Pdf::assertViewIs('test');
 });
+
+it('can determine the data that was passed to the view', function () {
+    Pdf::fake();
+
+    Route::get('pdf', function() {
+        return pdf('test')->inline();
+    });
+
+    $this
+        ->get('pdf')
+        ->assertSuccessful();
+
+    Pdf::assertRespondedWithPdf(function(\Spatie\LaravelPdf\Pdf $pdf) {
+        return $pdf->viewName === 'test'
+            && $pdf->isInline();
+    });
+});