addRule(new DuplicateH1()); $violations = $scanner->scan('

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'); $this->assertCount(1, $violations); $this->assertSame('WCAG_1_3_1_DUPLICATE_H1', $violations[0]->ruleId); } public function testPassesSingleH1(): void { $scanner = new Scanner(); $scanner->addRule(new DuplicateH1()); $violations = $scanner->scan('

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'); $this->assertCount(0, $violations); } }