Test function

gistfile1.php

public function test_validate_without_analyzers() {
        $language = new block_formal_langs_language_cpp_parseable_language();
        $question = new qtype_correctwriting_question();
        $question->usecase = true;
        $question->lexicalerrorthreshold = 3000;
        $question->lexicalerrorweight = 0.1;
        $question->usedlanguage = $language;
        $question->movedmistakeweight = 0.1;
        $question->absentmistakeweight = 0.11;
        $question->addedmistakeweight = 0.12;
        $question->hintgradeborder = 0.75;
        $question->maxmistakepercentage = 0.95;
        $question->qtype = new qtype_correctwriting();
        $question->islexicalanalyzerenabled = 1;
        $question->isenumanalyzerenabled = 1;
        $question->issequenceanalyzerenabled = 1;
        $question->issyntaxanalyzerenabled = 0;
        $contexts = new question_edit_contexts(context_system::instance());
        $generator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $generator->create_question_category(array());
        $question->category = $cat->id; 
        $form = new qtype_correctwriting_edit_form("",$question,$cat,$contexts);
        $data = array(
                    'langid' => 1
                );
        $errors = $form->validation($data, $files);
        $expected_errors = [];
        $this->assertEquals($errors,$expected_errors);
    }