1 files changed, 49 insertions, 0 deletions
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js
new file mode 100644
index 0000000000..2c15349139
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/use-returnValue.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// ------------------------------------------------------------------------------
+// Requirements
+// ------------------------------------------------------------------------------
+
+var rule = require("../lib/rules/use-returnValue");
+var RuleTester = require("eslint").RuleTester;
+
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
+
+// ------------------------------------------------------------------------------
+// Tests
+// ------------------------------------------------------------------------------
+
+function invalidCode(code, methodName) {
+  return {
+    code,
+    errors: [
+      {
+        messageId: "useReturnValue",
+        data: {
+          property: methodName,
+        },
+        type: "ExpressionStatement",
+      },
+    ],
+  };
+}
+
+ruleTester.run("use-returnValue", rule, {
+  valid: [
+    "a = foo.concat(bar)",
+    "b = bar.concat([1,3,4])",
+    "c = baz.concat()",
+    "d = qux.join(' ')",
+    "e = quux.slice(1)",
+  ],
+  invalid: [
+    invalidCode("foo.concat(bar)", "concat"),
+    invalidCode("bar.concat([1,3,4])", "concat"),
+    invalidCode("baz.concat()", "concat"),
+    invalidCode("qux.join(' ')", "join"),
+    invalidCode("quux.slice(1)", "slice"),
+  ],
+});