1 files changed, 41 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js
new file mode 100644
index 0000000000..f4ad001a08
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-default-preference-values.js
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-default-preference-values");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6 } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code) {
+  let message = "provide a default value instead of using a try/catch block";
+  return { code, errors: [{ message, type: "TryStatement" }] };
+}
+
+let types = ["Bool", "Char", "Float", "Int"];
+let methods = types.map(type => "get" + type + "Pref");
+
+ruleTester.run("use-default-preference-values", rule, {
+  valid: [].concat(
+    methods.map(m => "blah = branch." + m + "('blah', true);"),
+    methods.map(m => "blah = branch." + m + "('blah');"),
+    methods.map(
+      m => "try { canThrow(); blah = branch." + m + "('blah'); } catch(e) {}"
+    )
+  ),
+
+  invalid: [].concat(
+    methods.map(m =>
+      invalidCode("try { blah = branch." + m + "('blah'); } catch(e) {}")
+    )
+  ),
+});