public function testSerializePk() { $this->assertEquals('1', ActiveRecordCacheTags::serializePk(1)); $this->assertEquals('1|2', ActiveRecordCacheTags::serializePk(['A' => 1, 'B' => 2])); $this->assertEquals('1|2', ActiveRecordCacheTags::serializePk(['B' => 2, 'A' => 1])); }