From fbd7c137d5baae4ee68db7e384ef522749e2bcfd Mon Sep 17 00:00:00 2001
From: Teddy Katz <teddy.katz@gmail.com>
Date: Thu, 26 Jan 2017 21:30:23 -0500
Subject: [PATCH] Update: ensure operator-assignment handles exponentiation
 operators (#7970)

---
 lib/rules/operator-assignment.js       |  2 +-
 tests/lib/rules/operator-assignment.js | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/lib/rules/operator-assignment.js b/lib/rules/operator-assignment.js
index e003478c7bc..c5b82f5b0f4 100644
--- a/lib/rules/operator-assignment.js
+++ b/lib/rules/operator-assignment.js
@@ -27,7 +27,7 @@ function isCommutativeOperatorWithShorthand(operator) {
  *     a shorthand form.
  */
 function isNonCommutativeOperatorWithShorthand(operator) {
-    return ["+", "-", "/", "%", "<<", ">>", ">>>"].indexOf(operator) >= 0;
+    return ["+", "-", "/", "%", "<<", ">>", ">>>", "**"].indexOf(operator) >= 0;
 }
 
 //------------------------------------------------------------------------------
diff --git a/tests/lib/rules/operator-assignment.js b/tests/lib/rules/operator-assignment.js
index 84d28c653d7..ed394e315e7 100644
--- a/tests/lib/rules/operator-assignment.js
+++ b/tests/lib/rules/operator-assignment.js
@@ -16,7 +16,7 @@ const rule = require("../../../lib/rules/operator-assignment"),
 // Tests
 //------------------------------------------------------------------------------
 
-const ruleTester = new RuleTester();
+const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 7 } });
 
 const EXPECTED_OPERATOR_ASSIGNMENT = [{ message: "Assignment can be replaced with operator assignment.", type: "AssignmentExpression" }];
 const UNEXPECTED_OPERATOR_ASSIGNMENT = [{ message: "Unexpected operator assignment shorthand.", type: "AssignmentExpression" }];
@@ -40,6 +40,7 @@ ruleTester.run("operator-assignment", rule, {
         "x >>= x >> y",
         "x >>>= y",
         "x &= y",
+        "x **= y",
         "x ^= y ^ z",
         "x |= x | y",
         "x = x && y",
@@ -66,6 +67,11 @@ ruleTester.run("operator-assignment", rule, {
             code: "x = x + y",
             options: ["never"]
         },
+        {
+            code: "x = x ** y",
+            options: ["never"]
+        },
+        "x = y ** x",
         "x = x < y",
         "x = x > y",
         "x = x <= y",
@@ -184,6 +190,15 @@ ruleTester.run("operator-assignment", rule, {
         output: "(foo.bar) = (foo.bar) ^ ((((((((((((((((baz))))))))))))))))",
         options: ["never"],
         errors: UNEXPECTED_OPERATOR_ASSIGNMENT
+    }, {
+        code: "foo = foo ** bar",
+        output: "foo **= bar",
+        errors: EXPECTED_OPERATOR_ASSIGNMENT
+    }, {
+        code: "foo **= bar",
+        output: "foo = foo ** bar",
+        options: ["never"],
+        errors: UNEXPECTED_OPERATOR_ASSIGNMENT
     }]
 
 });