diff --git a/test/form/unused-side-effect/_config.js b/test/form/unused-side-effect/_config.js
new file mode 100644
index 0000000..0431077
--- /dev/null
+++ b/test/form/unused-side-effect/_config.js
@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'side-effects to non-globals are not blindly included'
+};
diff --git a/test/form/unused-side-effect/_expected/amd.js b/test/form/unused-side-effect/_expected/amd.js
new file mode 100644
index 0000000..c82bf4f
--- /dev/null
+++ b/test/form/unused-side-effect/_expected/amd.js
@@ -0,0 +1,7 @@
+define(function () { 'use strict';
+
+	var foo = 42;
+
+	assert.equal( foo, 42 );
+
+});
diff --git a/test/form/unused-side-effect/_expected/cjs.js b/test/form/unused-side-effect/_expected/cjs.js
new file mode 100644
index 0000000..0d2573f
--- /dev/null
+++ b/test/form/unused-side-effect/_expected/cjs.js
@@ -0,0 +1,5 @@
+'use strict';
+
+var foo = 42;
+
+assert.equal( foo, 42 );
diff --git a/test/form/unused-side-effect/_expected/es6.js b/test/form/unused-side-effect/_expected/es6.js
new file mode 100644
index 0000000..e50ecda
--- /dev/null
+++ b/test/form/unused-side-effect/_expected/es6.js
@@ -0,0 +1,3 @@
+var foo = 42;
+
+assert.equal( foo, 42 );
diff --git a/test/form/unused-side-effect/_expected/iife.js b/test/form/unused-side-effect/_expected/iife.js
new file mode 100644
index 0000000..a3f7fc8
--- /dev/null
+++ b/test/form/unused-side-effect/_expected/iife.js
@@ -0,0 +1,7 @@
+(function () { 'use strict';
+
+	var foo = 42;
+
+	assert.equal( foo, 42 );
+
+})();
diff --git a/test/form/unused-side-effect/_expected/umd.js b/test/form/unused-side-effect/_expected/umd.js
new file mode 100644
index 0000000..f96fd30
--- /dev/null
+++ b/test/form/unused-side-effect/_expected/umd.js
@@ -0,0 +1,11 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+	typeof define === 'function' && define.amd ? define(factory) :
+	factory();
+}(this, function () { 'use strict';
+
+	var foo = 42;
+
+	assert.equal( foo, 42 );
+
+}));
diff --git a/test/form/unused-side-effect/foo.js b/test/form/unused-side-effect/foo.js
new file mode 100644
index 0000000..f5aa754
--- /dev/null
+++ b/test/form/unused-side-effect/foo.js
@@ -0,0 +1,6 @@
+var uid = 0;
+uid = 1;
+uid += 1;
+uid++;
+
+export var foo = 42;
diff --git a/test/form/unused-side-effect/main.js b/test/form/unused-side-effect/main.js
new file mode 100644
index 0000000..ef12cae
--- /dev/null
+++ b/test/form/unused-side-effect/main.js
@@ -0,0 +1,2 @@
+import { foo } from './foo';
+assert.equal( foo, 42 );
diff --git a/test/function/modify-assumed-global/_config.js b/test/function/modify-assumed-global/_config.js
new file mode 100644
index 0000000..ee89a52
--- /dev/null
+++ b/test/function/modify-assumed-global/_config.js
@@ -0,0 +1,14 @@
+var assert = require( 'assert' );
+
+var Math = {};
+
+module.exports = {
+	description: 'side-effects to assumed globals are included',
+	context: {
+		Math: Math
+	},
+	exports: function ( exports ) {
+		assert.equal( Math.square( 3 ), 9 );
+		assert.equal( Math.cube( 3 ), 27 );
+	}
+};
diff --git a/test/function/modify-assumed-global/main.js b/test/function/modify-assumed-global/main.js
new file mode 100644
index 0000000..cc4f217
--- /dev/null
+++ b/test/function/modify-assumed-global/main.js
@@ -0,0 +1,3 @@
+import { square } from './math';
+
+assert.equal( square( 2 ), 4 );
diff --git a/test/function/modify-assumed-global/math.js b/test/function/modify-assumed-global/math.js
new file mode 100644
index 0000000..469df59
--- /dev/null
+++ b/test/function/modify-assumed-global/math.js
@@ -0,0 +1,15 @@
+function square ( x ) {
+	return x * x;
+}
+
+function cube ( x ) {
+	return x * x * x;
+}
+
+Math.square = square;
+
+if ( true ) {
+	Math.cube = cube;
+}
+
+export { square };