diff --git a/test/cli/no-treeshake/_config.js b/test/cli/no-treeshake/_config.js
new file mode 100644
index 0000000..18d8b69
--- /dev/null
+++ b/test/cli/no-treeshake/_config.js
@@ -0,0 +1,4 @@
+module.exports = {
+	description: 'generates IIFE export with all code',
+	command: 'rollup main.js --format iife --name shakeless --no-treeshake'
+};
diff --git a/test/cli/no-treeshake/_expected.js b/test/cli/no-treeshake/_expected.js
new file mode 100644
index 0000000..6c3cf53
--- /dev/null
+++ b/test/cli/no-treeshake/_expected.js
@@ -0,0 +1,10 @@
+var shakeless = (function () {
+	'use strict';
+
+	const version = '1.2.0';
+
+	var main = ( x, y ) => x + y;
+
+	return main;
+
+}());
diff --git a/test/cli/no-treeshake/main.js b/test/cli/no-treeshake/main.js
new file mode 100644
index 0000000..1aa6a51
--- /dev/null
+++ b/test/cli/no-treeshake/main.js
@@ -0,0 +1,3 @@
+const version = '1.2.0';
+
+export default ( x, y ) => x + y;
diff --git a/test/form/no-treeshake/_config.js b/test/form/no-treeshake/_config.js
new file mode 100644
index 0000000..a997358
--- /dev/null
+++ b/test/form/no-treeshake/_config.js
@@ -0,0 +1,11 @@
+module.exports = {
+	description: 'all code should be included if tree-shaking is disabled',
+	options: {
+		external: [ 'external' ],
+		globals: {
+			external: 'external'
+		},
+		moduleName: /* not shaken, but */ 'stirred',
+		treeshake: false
+	}
+};
diff --git a/test/form/no-treeshake/_expected/amd.js b/test/form/no-treeshake/_expected/amd.js
new file mode 100644
index 0000000..c4a0beb
--- /dev/null
+++ b/test/form/no-treeshake/_expected/amd.js
@@ -0,0 +1,20 @@
+define(['exports', 'external'], function (exports, external) { 'use strict';
+
+	var foo = 'unused';
+
+	const quux = 1;
+
+	const other = () => quux;
+
+	function bar () {
+		return foo;
+	}
+
+	function baz () {
+		return 13 + external.value;
+	}
+
+	exports.baz = baz;
+	exports.strange = quux;
+
+});
diff --git a/test/form/no-treeshake/_expected/cjs.js b/test/form/no-treeshake/_expected/cjs.js
new file mode 100644
index 0000000..dbd1396
--- /dev/null
+++ b/test/form/no-treeshake/_expected/cjs.js
@@ -0,0 +1,20 @@
+'use strict';
+
+var external = require('external');
+
+var foo = 'unused';
+
+const quux = 1;
+
+const other = () => quux;
+
+function bar () {
+	return foo;
+}
+
+function baz () {
+	return 13 + external.value;
+}
+
+exports.baz = baz;
+exports.strange = quux;
diff --git a/test/form/no-treeshake/_expected/es6.js b/test/form/no-treeshake/_expected/es6.js
new file mode 100644
index 0000000..73ea36c
--- /dev/null
+++ b/test/form/no-treeshake/_expected/es6.js
@@ -0,0 +1,17 @@
+import * as external from 'external';
+
+var foo = 'unused';
+
+const quux = 1;
+
+const other = () => quux;
+
+function bar () {
+	return foo;
+}
+
+function baz () {
+	return 13 + external.value;
+}
+
+export { baz, quux as strange };
diff --git a/test/form/no-treeshake/_expected/iife.js b/test/form/no-treeshake/_expected/iife.js
new file mode 100644
index 0000000..4835548
--- /dev/null
+++ b/test/form/no-treeshake/_expected/iife.js
@@ -0,0 +1,21 @@
+(function (exports,external) {
+	'use strict';
+
+	var foo = 'unused';
+
+	const quux = 1;
+
+	const other = () => quux;
+
+	function bar () {
+		return foo;
+	}
+
+	function baz () {
+		return 13 + external.value;
+	}
+
+	exports.baz = baz;
+	exports.strange = quux;
+
+}((this.stirred = this.stirred || {}),external));
diff --git a/test/form/no-treeshake/_expected/umd.js b/test/form/no-treeshake/_expected/umd.js
new file mode 100644
index 0000000..715d58b
--- /dev/null
+++ b/test/form/no-treeshake/_expected/umd.js
@@ -0,0 +1,24 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('external')) :
+	typeof define === 'function' && define.amd ? define(['exports', 'external'], factory) :
+	(factory((global.stirred = global.stirred || {}),global.external));
+}(this, function (exports,external) { 'use strict';
+
+	var foo = 'unused';
+
+	const quux = 1;
+
+	const other = () => quux;
+
+	function bar () {
+		return foo;
+	}
+
+	function baz () {
+		return 13 + external.value;
+	}
+
+	exports.baz = baz;
+	exports.strange = quux;
+
+}));
diff --git a/test/form/no-treeshake/foo.js b/test/form/no-treeshake/foo.js
new file mode 100644
index 0000000..e4c7f51
--- /dev/null
+++ b/test/form/no-treeshake/foo.js
@@ -0,0 +1 @@
+export default 'unused';
diff --git a/test/form/no-treeshake/main.js b/test/form/no-treeshake/main.js
new file mode 100644
index 0000000..0ccd5e1
--- /dev/null
+++ b/test/form/no-treeshake/main.js
@@ -0,0 +1,11 @@
+import * as external from 'external';
+import foo from './foo.js'
+export { quux as strange } from './quux.js';
+
+function bar () {
+	return foo;
+}
+
+export function baz () {
+	return 13 + external.value;
+}
diff --git a/test/form/no-treeshake/quux.js b/test/form/no-treeshake/quux.js
new file mode 100644
index 0000000..ceb5f12
--- /dev/null
+++ b/test/form/no-treeshake/quux.js
@@ -0,0 +1,3 @@
+export const quux = 1;
+
+const other = () => quux;