diff --git a/src/generators/Generator.js b/src/generators/Generator.js
index 272e843142..83f726cab6 100644
--- a/src/generators/Generator.js
+++ b/src/generators/Generator.js
@@ -11,6 +11,8 @@ import getOutro from './shared/utils/getOutro.js';
 import processCss from './shared/processCss.js';
 import annotateWithScopes from './annotateWithScopes.js';
 
+const test = typeof global !== 'undefined' && global.__svelte_test;
+
 export default class Generator {
 	constructor ( parsed, source, name, options ) {
 		this.parsed = parsed;
@@ -238,6 +240,7 @@ export default class Generator {
 	}
 
 	getUniqueName ( name ) {
+		if ( test ) name = `${name}$`;
 		let alias = name;
 		for ( let i = 1; reservedNames.has( alias ) || this.importedNames.has( alias ) || this._usedNames.has( alias ); alias = `${name}_${i++}` );
 		this._usedNames.add( alias );
@@ -247,6 +250,7 @@ export default class Generator {
 	getUniqueNameMaker ( params ) {
 		const localUsedNames = new Set( params );
 		return name => {
+			if ( test ) name = `${name}$`;
 			let alias = name;
 			for ( let i = 1; reservedNames.has( alias ) || this.importedNames.has( alias ) || this._usedNames.has( alias ) || localUsedNames.has( alias ); alias = `${name}_${i++}` );
 			localUsedNames.add( alias );
diff --git a/src/generators/dom/visitors/Element/EventHandler.js b/src/generators/dom/visitors/Element/EventHandler.js
index 2a51cdc1ff..63b8f0b43d 100644
--- a/src/generators/dom/visitors/Element/EventHandler.js
+++ b/src/generators/dom/visitors/Element/EventHandler.js
@@ -32,7 +32,7 @@ export default function visitEventHandler ( generator, block, state, node, attri
 	const declarations = usedContexts.map( name => {
 		if ( name === 'root' ) {
 			if ( shouldHoist ) state.usesComponent = true;
-			return 'var root = component.get();';
+			return `var root = ${block.component}.get();`;
 		}
 
 		const listName = block.listNames.get( name );
@@ -52,7 +52,7 @@ export default function visitEventHandler ( generator, block, state, node, attri
 
 	if ( state.usesComponent ) {
 		// TODO the element needs to know to create `thing._svelte = { component: component }`
-		handlerBody.addLine( `var component = this._svelte.component;` );
+		handlerBody.addLine( `var ${block.component} = this._svelte.component;` );
 	}
 
 	declarations.forEach( declaration => {
diff --git a/src/generators/dom/visitors/Element/meta/Window.js b/src/generators/dom/visitors/Element/meta/Window.js
index c0f9f3d181..b1dc8f8ecf 100644
--- a/src/generators/dom/visitors/Element/meta/Window.js
+++ b/src/generators/dom/visitors/Element/meta/Window.js
@@ -22,7 +22,7 @@ export default function visitWindow ( generator, block, node ) {
 			const flattened = flattenReference( attribute.expression.callee );
 			if ( flattened.name !== 'event' && flattened.name !== 'this' ) {
 				// allow event.stopPropagation(), this.select() etc
-				generator.code.prependRight( attribute.expression.start, 'component.' );
+				generator.code.prependRight( attribute.expression.start, `${block.component}.` );
 			}
 
 			const handlerName = block.getUniqueName( `onwindow${attribute.name}` );
@@ -68,7 +68,7 @@ export default function visitWindow ( generator, block, node ) {
 
 		block.builders.create.addBlock( deindent`
 			var ${handlerName} = function ( event ) {
-				component.set({
+				${block.component}.set({
 					${props}
 				});
 			};
diff --git a/test/helpers.js b/test/helpers.js
index 905233280c..4318d6d364 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -10,9 +10,18 @@ sourceMapSupport.install();
 
 // for coverage purposes, we need to test source files,
 // but for sanity purposes, we need to test dist files
-export const svelte = process.env.COVERAGE ?
-	require( '../src/index.js' ) :
-	require( '../compiler/svelte.js' );
+export function loadSvelte ( test ) {
+	if ( test ) global.__svelte_test = true;
+
+	const resolved = process.env.COVERAGE ?
+		require.resolve( '../src/index.js' ) :
+		require.resolve( '../compiler/svelte.js' );
+
+	delete require.cache[ resolved ];
+	return require( resolved );
+}
+
+export const svelte = loadSvelte();
 
 export function exists ( path ) {
 	try {
diff --git a/test/runtime/index.js b/test/runtime/index.js
index f4926388c1..e67192cbc6 100644
--- a/test/runtime/index.js
+++ b/test/runtime/index.js
@@ -5,7 +5,9 @@ import * as fs from 'fs';
 import * as acorn from 'acorn';
 import * as babel from 'babel-core';
 
-import { addLineNumbers, loadConfig, svelte, env, setupHtmlEqual } from '../helpers.js';
+import { addLineNumbers, loadConfig, loadSvelte, env, setupHtmlEqual } from '../helpers.js';
+
+let svelte;
 
 let showCompiledCode = false;
 let compileOptions = null;
@@ -33,7 +35,10 @@ require.extensions[ '.html' ] = function ( module, filename ) {
 const Object_assign = Object.assign;
 
 describe( 'runtime', () => {
-	before( setupHtmlEqual );
+	before( () => {
+		svelte = loadSvelte( true );
+		return setupHtmlEqual();
+	});
 
 	function runTest ( dir, shared ) {
 		if ( dir[0] === '.' ) return;