function newMultilineKeywordTester(keyword) {
	return {
		test: (node, sourceCode) =>
			node.loc.start.line !== node.loc.end.line &&
			sourceCode.getFirstToken(node).value === keyword,
	};
}
Creates tester which check if a node starts with specific keyword and spans multiple lines.
@param {string} keyword The keyword to test.
@returns {Object} the created tester.
@private