Chore: Updated no-control-regex tests to cover all cases (fixes #6438) (

#6752)

toString prints out different outputs for /\x01/ and "/\x01/". Because
of that behavior, no-control-regex rule was broken before(fixed on 141b778).

During the fix I added a test to cover the case I wrote for fix. Which
was also passing when the fix was not there. The test was on a string
literal unfortunately which was not covering the test case where regex
is written on a literal (like /\x01/). Changed the tests to make sure it
covers the literal regex's as expected.

tests/lib/rules/no-control-regex.js

@@ -21,15 +21,16 @@ var ruleTester = new RuleTester();
 ruleTester.run("no-control-regex", rule, {
     valid: [
         "var regex = /x1f/",
+        "var regex =" + /\\x1f/,
         "var regex = new RegExp('x1f')",
         "var regex = RegExp('x1f')",
         "new RegExp('[')",
         "RegExp('[')",
         "new (function foo(){})('\\x1f')"
     ],
     invalid: [
-        { code: "var regex = /\x1f/", errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] },
-        { code: "var regex = /\\\x1f/", errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] },
+        { code: "var regex = " + /\x1f/, errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] }, // eslint-disable-line no-control-regex
+        { code: "var regex = " + /\\\x1f/, errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] }, // eslint-disable-line no-control-regex
         { code: "var regex = new RegExp('\\x1f')", errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] },
         { code: "var regex = RegExp('\\x1f')", errors: [{ message: "Unexpected control character in regular expression.", type: "Literal"}] }
     ]