[9.x] Adds collect() helper on TestResponse

src/Illuminate/Testing/TestResponse.php

@@ -1004,6 +1004,17 @@ public function json($key = null)
         return $this->decodeResponseJson()->json($key);
     }
 
+    /**
+     * Get the JSON decoded body of the response as a collection.
+     *
+     * @param  string|null  $key
+     * @return \Illuminate\Support\Collection
+     */
+    public function collect($key = null)
+    {
+        return Collection::make($this->json($key));
+    }
+
     /**
      * Assert that the response view equals the given value.
      *

tests/Testing/TestResponseTest.php

@@ -16,6 +16,7 @@
 use Illuminate\Routing\UrlGenerator;
 use Illuminate\Session\ArraySessionHandler;
 use Illuminate\Session\Store;
+use Illuminate\Support\Collection;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\ViewErrorBag;
 use Illuminate\Testing\Fluent\AssertableJson;
@@ -1584,6 +1585,46 @@ public function testJsonHelper()
         );
     }
 
+    /**
+     * @group 1
+     */
+    public function testResponseCanBeReturnedAsCollection()
+    {
+        $response = TestResponse::fromBaseResponse(new Response(new JsonSerializableMixedResourcesStub));
+
+        $this->assertInstanceOf(Collection::class, $response->collect());
+        $this->assertEquals(collect([
+            'foo' => 'bar',
+            'foobar' => [
+                'foobar_foo' => 'foo',
+                'foobar_bar' => 'bar',
+            ],
+            '0' => ['foo'],
+            'bars' => [
+                ['bar' => 'foo 0', 'foo' => 'bar 0'],
+                ['bar' => 'foo 1', 'foo' => 'bar 1'],
+                ['bar' => 'foo 2', 'foo' => 'bar 2'],
+            ],
+            'baz' => [
+                ['foo' => 'bar 0', 'bar' => ['foo' => 'bar 0', 'bar' => 'foo 0']],
+                ['foo' => 'bar 1', 'bar' => ['foo' => 'bar 1', 'bar' => 'foo 1']],
+            ],
+            'barfoo' => [
+                ['bar' => ['bar' => 'foo 0']],
+                ['bar' => ['bar' => 'foo 0', 'foo' => 'foo 0']],
+                ['bar' => ['foo' => 'bar 0', 'bar' => 'foo 0', 'rab' => 'rab 0']],
+            ],
+            'numeric_keys' => [
+                2 => ['bar' => 'foo 0', 'foo' => 'bar 0'],
+                3 => ['bar' => 'foo 1', 'foo' => 'bar 1'],
+                4 => ['bar' => 'foo 2', 'foo' => 'bar 2'],
+            ],
+        ]), $response->collect());
+        $this->assertEquals(collect(['foobar_foo' => 'foo', 'foobar_bar' => 'bar']), $response->collect('foobar'));
+        $this->assertEquals(collect(['bar']), $response->collect('foobar.foobar_bar'));
+        $this->assertEquals(collect(), $response->collect('missing_key'));
+    }
+
     public function testItCanBeTapped()
     {
         $response = TestResponse::fromBaseResponse(