[5.7] Add tests for decodeResponseJson (#26741)

* Add test to prevent assertJsonStructure from breaking

This test will prevent assertJsonStructure from breaking when an array with numeric keys which don't start from 0 is encoded to json and passed through it.

See #26677 for more info.

* Add test to expect exception message from decodeResponseJson

This test will ensure that the exception message is thrown when invalid JSON is being returned from the route.

See #26684

tests/Foundation/FoundationTestResponseTest.php

@@ -167,6 +167,18 @@ public function testAssertJsonWithArray()
         $response->assertJson($resource->jsonSerialize());
     }
 
+    public function testAssertJsonWithNull()
+    {
+        $response = TestResponse::fromBaseResponse(new Response(null));
+
+        $this->expectException(AssertionFailedError::class);
+        $this->expectExceptionMessage('Invalid JSON was returned from the route.');
+
+        $resource = new JsonSerializableSingleResourceStub;
+
+        $response->assertJson($resource->jsonSerialize());
+    }
+
     public function testAssertJsonWithMixed()
     {
         $response = TestResponse::fromBaseResponse(new Response(new JsonSerializableMixedResourcesStub));
@@ -224,6 +236,9 @@ public function testAssertJsonStructure()
         // Wildcard (repeating structure)
         $response->assertJsonStructure(['bars' => ['*' => ['bar', 'foo']]]);
 
+        // Wildcard (numeric keys)
+        $response->assertJsonStructure(['numeric_keys' => ['*' => ['bar', 'foo']]]);
+
         // Nested after wildcard
         $response->assertJsonStructure(['baz' => ['*' => ['foo', 'bar' => ['foo', 'bar']]]]);
 
@@ -395,17 +410,17 @@ class JsonSerializableMixedResourcesStub implements JsonSerializable
     public function jsonSerialize()
     {
         return [
-            'foo'    => 'bar',
+            'foo' => 'bar',
             'foobar' => [
                 'foobar_foo' => 'foo',
                 'foobar_bar' => 'bar',
             ],
-            'bars'   => [
+            'bars' => [
                 ['bar' => 'foo 0', 'foo' => 'bar 0'],
                 ['bar' => 'foo 1', 'foo' => 'bar 1'],
                 ['bar' => 'foo 2', 'foo' => 'bar 2'],
             ],
-            'baz'    => [
+            'baz' => [
                 ['foo' => 'bar 0', 'bar' => ['foo' => 'bar 0', 'bar' => 'foo 0']],
                 ['foo' => 'bar 1', 'bar' => ['foo' => 'bar 1', 'bar' => 'foo 1']],
             ],
@@ -414,6 +429,11 @@ public function jsonSerialize()
                 ['bar' => ['bar' => 'foo 0', 'bar' => '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'],
+            ],
         ];
     }
 }