Rule `php_unit_data_provider_return_type`¶

The return type of PHPUnit data provider must be iterable.

Description¶

Data provider must return iterable, either an array of arrays or an object that implements the Traversable interface.

Risky when relying on signature of the data provider.

--- Original
+++ New
 <?php
 class FooTest extends TestCase {
     /**
      * @dataProvider provideSomethingCases
      */
     public function testSomething($expected, $actual) {}
-    public function provideSomethingCases(): array {}
+    public function provideSomethingCases(): iterable {}
 }

--- Original
+++ New
 <?php
 class FooTest extends TestCase {
     /**
      * @dataProvider provideSomethingCases
      */
     public function testSomething($expected, $actual) {}
-    public function provideSomethingCases() {}
+    public function provideSomethingCases(): iterable {}
 }

The rule is part of the following rule set: