[Tests] add has-strict-mode

package.json

@@ -51,18 +51,19 @@
 		"is-string": "^1.0.4"
 	},
 	"devDependencies": {
-		"foreach": "^2.0.5",
-		"function-bind": "^1.1.0",
-		"tape": "^4.6.3",
-		"indexof": "^0.0.1",
+		"@es-shims/api": "^1.2.0",
+		"@ljharb/eslint-config": "^8.0.0",
 		"covert": "^1.1.0",
 		"eslint": "^3.10.2",
-		"@ljharb/eslint-config": "^8.0.0",
-		"semver": "^5.3.0",
-		"replace": "^0.3.0",
-		"@es-shims/api": "^1.2.0",
 		"evalmd": "^0.0.17",
-		"safe-publish-latest": "^1.1.1"
+		"foreach": "^2.0.5",
+		"function-bind": "^1.1.1",
+		"has-strict-mode": "^1.0.0",
+		"indexof": "^0.0.1",
+		"replace": "^0.3.0",
+		"safe-publish-latest": "^1.1.1",
+		"semver": "^5.3.0",
+		"tape": "^4.6.3"
 	},
 	"testling": {
 		"files": [

test/implementation.js

@@ -1,12 +1,9 @@
 var some = require('../implementation');
 var bind = require('function-bind');
 var test = require('tape');
-var runTests = require('./tests');
+var hasStrictMode = require('has-strict-mode')();
 
-var hasStrictMode = (function () {
-	'use strict';
-	return !this;
-}());
+var runTests = require('./tests');
 
 test('as a function', function (t) {
 	t.test('bad array/this value', function (st) {

test/shimmed.js

@@ -3,12 +3,10 @@ require('../shim')();
 var test = require('tape');
 var defineProperties = require('define-properties');
 var bind = require('function-bind');
+var hasStrictMode = require('has-strict-mode')();
+
 var isEnumerable = Object.prototype.propertyIsEnumerable;
 var functionsHaveNames = function f() {}.name === 'f';
-var hasStrictMode = (function () {
-	'use strict';
-	return !this;
-}());
 
 var runTests = require('./tests');
 

test/tests.js

@@ -1,13 +1,11 @@
+var hasStrictMode = require('has-strict-mode')();
+
 var global = Function('return this')(); // eslint-disable-line no-new-func
 var trueThunk = function () { return true; };
 var falseThunk = function () { return false; };
 
 var canDistinguishSparseFromUndefined = 0 in [undefined]; // IE 6 - 8 have a bug where this returns false.
 var undefinedIfNoSparseBug = canDistinguishSparseFromUndefined ? undefined : { valueOf: function () { return 0; } };
-var hasStrictMode = (function () {
-	'use strict';
-	return !this;
-}());
 
 var createArrayLikeFromArray = function createArrayLikeFromArray(arr) {
 	var o = {};