public function testMergeKey() { $d = SkinHandler::INSTANCE_DELIMITER; $this->assertEquals("a{$d}b", $this->handler->mergeKey('a', 'b')); $this->assertEquals("a", $this->handler->mergeKey('a')); $this->assertEquals("a{$d}b", $this->handler->mergeKey(['a', 'b'])); $this->assertEquals("a{$d}b{$d}c", $this->handler->mergeKey(['a', 'b'], 'c')); $this->assertEquals("a{$d}c", $this->handler->mergeKey(['a', null], 'c')); }