diff --git a/tests/Dataset.php b/tests/Dataset.php
index 71d55b2..e1ceb52 100644
--- a/tests/Dataset.php
+++ b/tests/Dataset.php
@@ -10,11 +10,11 @@ use Generator;
 use GuzzleHttp\Client;
 use GuzzleHttp\Psr7\Request as Psr7Request;
 use GuzzleHttp\Psr7\Response as Psr7Response;
+use GuzzleHttp\Psr7\Stream;
 use Illuminate\Http\Client\Request;
 use Illuminate\Http\Client\Response;
 use Mockery;
 use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\StreamInterface;
 
 /**
  * The dataset provider.
@@ -462,21 +462,15 @@ final class Dataset
      */
     public static function forSources(): Generator
     {
+        $parsed = require fixture('parsing/simple_array.php');
         $path = fixture('json/simple_array.json');
         $json = file_get_contents($path);
         $size = strlen($json);
         $request = new Psr7Request('GET', 'foo');
 
-        $stream = Mockery::mock(StreamInterface::class)
-            ->shouldReceive([
-                'getSize' => $size,
-                'isReadable' => true,
-            ])
-            ->getMock();
-
         $response = Mockery::mock(ResponseInterface::class)
             ->shouldReceive('getBody')
-            ->andReturn($stream)
+            ->andReturnUsing(fn () => new Stream(fopen($path, 'rb')))
             ->getMock();
 
         $client = Mockery::mock(Client::class)
@@ -500,7 +494,7 @@ final class Dataset
 
         $psr7Response = Mockery::mock(Psr7Response::class)
             ->shouldReceive('getBody')
-            ->andReturn($stream)
+            ->andReturn(new Stream(fopen($path, 'rb')))
             ->getMock();
 
         $psr7Request = Mockery::mock(Sources\Psr7Request::class, [$request])
@@ -522,11 +516,11 @@ final class Dataset
             new Sources\LaravelClientResponse(new Response($psr7Response)),
             new Sources\Psr7Message($response),
             $psr7Request,
-            new Sources\Psr7Stream($stream),
+            new Sources\Psr7Stream(new Stream(fopen($path, 'rb'))),
         ];
 
         foreach ($sources as $source) {
-            yield [$source, $size];
+            yield [$source, $size, $parsed];
         }
     }
 }
diff --git a/tests/Feature/SourcesTest.php b/tests/Feature/SourcesTest.php
index f54801b..29f45ca 100644
--- a/tests/Feature/SourcesTest.php
+++ b/tests/Feature/SourcesTest.php
@@ -17,9 +17,11 @@ it('throws an exception when Guzzle is required but not installed', function (So
         ->toThrow(GuzzleRequiredException::class, 'Guzzle is required to load JSON from endpoints');
 })->with(Dataset::forSourcesRequiringGuzzle());
 
-it('supports multiple sources', function (Source $source, int $size) {
+it('supports multiple sources', function (Source $source, int $size, array $parsed) {
     expect($source)
         ->getIterator()->toBeInstanceOf(Traversable::class)
         ->matches()->toBeTrue()
         ->size()->toBe($size);
+
+    expect(new JsonParser($source))->toParseTo($parsed);
 })->with(Dataset::forSources());