fix: FakeModel implement correctly ArrayAccess (add missing return type on offsetGet)

Author: Ark4ne

src/Support/FakeModel.php

@@ -11,9 +11,6 @@
 use JsonSerializable;
 use Traversable;
 
-/**
- * @codeCoverageIgnore
- */
 class FakeModel implements Arrayable, ArrayAccess, Countable, IteratorAggregate, Jsonable, JsonSerializable
 {
     public function __get($name): self
@@ -41,6 +38,11 @@ public static function __callStatic($name, $args): self
         return new self;
     }
 
+    public function __invoke(): self
+    {
+        return new self;
+    }
+
     public function __toString()
     {
         return '';
@@ -56,7 +58,7 @@ public function offsetExists(mixed $offset): bool
         return $this->__isset($offset);
     }
 
-    public function offsetGet(mixed $offset)
+    public function offsetGet(mixed $offset): mixed
     {
         return $this->__get($offset);
     }

tests/Unit/Support/FakeModelTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace Test\Unit\Support;
+
+use Ark4ne\JsonApi\Support\FakeModel;
+use Test\TestCase;
+
+class FakeModelTest extends TestCase
+{
+    public function testFakeModel()
+    {
+        $model = new FakeModel;
+
+        $this->assertFalse(isset($model->abc));
+        $this->assertInstanceOf(FakeModel::class, FakeModel::abc());
+        $this->assertInstanceOf(FakeModel::class, $model->abc);
+        $this->assertInstanceOf(FakeModel::class, $model['abc']);
+        $this->assertInstanceOf(FakeModel::class, $model->abc['def']->ghi['jkl']);
+        $this->assertInstanceOf(FakeModel::class, $model->abc()['def']()->ghi['jkl']());
+        $this->assertEquals(0, count($model));
+        $this->assertEquals([], $model->toArray());
+        $this->assertEquals([], $model->jsonSerialize());
+        $this->assertEquals('[]', $model->toJson());
+        $this->assertEquals('[]', json_encode($model));
+        $this->assertEquals('', (string)($model));
+
+        $model->abc = 123;
+        $this->assertInstanceOf(FakeModel::class, $model->abc);
+        $this->assertInstanceOf(FakeModel::class, $model['abc']);
+        $this->assertFalse(isset($model->abc));
+        $this->assertFalse(isset($model['abc']));
+        $model['abc'] = 123;
+        $this->assertInstanceOf(FakeModel::class, $model['abc']);
+        $this->assertFalse(isset($model->abc));
+        $this->assertFalse(isset($model['abc']));
+
+        unset($model->abc);
+        $this->assertInstanceOf(FakeModel::class, $model->abc);
+        $this->assertInstanceOf(FakeModel::class, $model['abc']);
+
+        unset($model['abc']);
+        $this->assertInstanceOf(FakeModel::class, $model->abc);
+        $this->assertInstanceOf(FakeModel::class, $model['abc']);
+
+        $each = 0;
+        foreach ($model as $item) {
+            $each++;
+        }
+        $this->assertEquals(0, $each);
+    }
+}