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diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/mark-test-function-used.js
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+/**
+ * @fileoverview Simply marks `test` (the test method) or `run_test` as used
+ * when in mochitests or xpcshell tests respectively. This avoids ESLint telling
+ * us that the function is never called.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+var helpers = require("../helpers");
+
+module.exports = {
+ // This rule currently has no messages.
+ // eslint-disable-next-line eslint-plugin/prefer-message-ids
+ meta: {
+ docs: {
+ url: "https://firefox-source-docs.mozilla.org/code-quality/lint/linters/eslint-plugin-mozilla/mark-test-function-used.html",
+ },
+ schema: [],
+ type: "problem",
+ },
+
+ create(context) {
+ return {
+ Program() {
+ let testType = helpers.getTestType(context);
+ if (testType == "browser") {
+ context.markVariableAsUsed("test");
+ }
+
+ if (testType == "xpcshell") {
+ context.markVariableAsUsed("run_test");
+ }
+
+ if (helpers.getIsSjs(context)) {
+ context.markVariableAsUsed("handleRequest");
+ }
+ },
+ };
+ },
+};