/** * @dataProvider provider_sampleMinusDaysSymmetry * @group long */ public function test_minusDays_symmetry(LocalDateTime $reference) { for ($days = 0; $days < 365 * 8; $days++) { $t = $reference->minusDays($days)->minusDays(-$days); $this->assertEquals($t, $reference); $t = $reference->minusDays(-$days)->minusDays($days); $this->assertEquals($t, $reference); } }