add test for #901

test/form/side-effect-p/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'detects mutation of globals'
+};

test/form/side-effect-p/_expected/amd.js

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+define(function () { 'use strict';
+
+	var bool = true;
+
+	const hs = document.documentElement.style;
+
+	if ( bool ) {
+		hs.color = "#222"
+	}
+
+});

test/form/side-effect-p/_expected/cjs.js

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+'use strict';
+
+var bool = true;
+
+const hs = document.documentElement.style;
+
+if ( bool ) {
+	hs.color = "#222"
+}

test/form/side-effect-p/_expected/es.js

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+var bool = true;
+
+const hs = document.documentElement.style;
+
+if ( bool ) {
+	hs.color = "#222"
+}

test/form/side-effect-p/_expected/iife.js

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+(function () {
+	'use strict';
+
+	var bool = true;
+
+	const hs = document.documentElement.style;
+
+	if ( bool ) {
+		hs.color = "#222"
+	}
+
+}());

test/form/side-effect-p/_expected/umd.js

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+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	(factory());
+}(this, (function () { 'use strict';
+
+	var bool = true;
+
+	const hs = document.documentElement.style;
+
+	if ( bool ) {
+		hs.color = "#222"
+	}
+
+})));

test/form/side-effect-p/bool.js

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+export default true;

test/form/side-effect-p/main.js

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+import bool from './bool';
+
+const hs = document.documentElement.style;
+
+if ( bool ) {
+	hs.color = "#222"
+}