Chore: add JSDoc types for RuleTester test cases

lib/rule-tester/rule-tester.js

@@ -272,11 +272,49 @@ class RuleTester {
         this.rules[name] = rule;
     }
 
+    /**
+     * @typedef {{
+     *   code: string,
+     *   options?: any,
+     *   filename?: string,
+     *   parserOptions?: Linter.ParserOptions,
+     *   settings?: { [name: string]: any },
+     *   parser?: string,
+     *   globals?: { [name: string]: boolean }
+     * }} ValidTestCase
+     *
+     * @typedef {{
+     *   code: string,
+     *   errors: number | Array<TestCaseError | string>,
+     *   output?: string | null,
+     *   options?: any,
+     *   filename?: string,
+     *   parserOptions?: Linter.ParserOptions,
+     *   settings?: { [name: string]: any },
+     *   parser?: string,
+     *   globals?: { [name: string]: boolean }
+     * }} InvalidTestCase
+     *
+     * @typedef {{
+     *   message?: string | RegExp,
+     *   messageId?: string,
+     *   type?: string,
+     *   data?: any,
+     *   line?: number,
+     *   column?: number,
+     *   endLine?: number,
+     *   endColumn?: number,
+     * }} TestCaseError
+     */
+
     /**
      * Adds a new rule test to execute.
      * @param {string} ruleName The name of the rule to run.
      * @param {Function} rule The rule to test.
-     * @param {Object} test The collection of tests to run.
+     * @param {{
+     *   valid: (ValidTestCase | string)[],
+     *   invalid: InvalidTestCase[]
+     * }} test The collection of tests to run.
      * @returns {void}
      */
     run(ruleName, rule, test) {