Use static methods inside data providers

Author: OskarStark

Tests/Config/ContainerParametersResourceCheckerTest.php

@@ -51,7 +51,7 @@ public function testIsFresh(callable $mockContainer, $expected)
         $this->assertSame($expected, $this->resourceChecker->isFresh($this->resource, time()));
     }
 
-    public function isFreshProvider()
+    public static function isFreshProvider()
     {
         yield 'not fresh on missing parameter' => [function (MockObject $container) {
             $container->method('hasParameter')->with('locales')->willReturn(false);
@@ -62,11 +62,11 @@ public function isFreshProvider()
         }, false];
 
         yield 'fresh on every identical parameters' => [function (MockObject $container) {
-            $container->expects($this->exactly(2))->method('hasParameter')->willReturn(true);
-            $container->expects($this->exactly(2))->method('getParameter')
+            $container->expects(self::exactly(2))->method('hasParameter')->willReturn(true);
+            $container->expects(self::exactly(2))->method('getParameter')
                 ->withConsecutive(
-                    [$this->equalTo('locales')],
-                    [$this->equalTo('default_locale')]
+                    [self::equalTo('locales')],
+                    [self::equalTo('default_locale')]
                 )
                 ->willReturnMap([
                     ['locales', ['fr', 'en']],