Update tests and doc for filters

README.rst

@@ -121,12 +121,13 @@ compile ES6 code in your assets pipeline.  You register this filter as
     register_filter(BabelJS)
 
 Which makes the filter available with the ``babeljs`` name.
-Only supported filter option is currently `BABEL_MODULES_LOADER = 'systemjs'` to
-specify that compiled code should use SystemJS instead of CommonJS for modules.
+Only supported filter option is currently `BABEL_MODULES_LOADER` with value
+``systemjs`` or ``umd`` to specify that compiled code should use SystemJS
+or UMD instead of CommonJS for modules.
 
 **NOTE:** When using the BabelJS compiler for code that needs to run
 in the browser, make sure to add
-https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.6.1/polyfill.min.js
+https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.13.0/polyfill.min.js
 dependency.
 
 JSX to React Transpiling

tests/test_webassets_filter.py

@@ -10,9 +10,15 @@ except:
     from StringIO import StringIO
 
 
-class TestAssetsFilters(object):
+class TestAssetsFilters(TempEnvironmentHelper):
+    @classmethod
+    def setup_class(cls):
+        from webassets.filter import register_filter
+        register_filter(BabelJS)
+        register_filter(TypeScript)
+
     def test_babeljs_filter(self):
-        es6source = StringIO('''
+        ES6CODE = '''
 class Point {
     constructor(x, y) {
         this.x = x;
@@ -22,20 +28,17 @@ class Point {
         return '(' + this.x + ', ' + this.y + ')';
     }
 }
-''')
-
-        out = StringIO()
-        BabelJS().input(es6source, out)
-        
-        out.seek(0)
-        ans = out.read()
+'''
+        self.create_files({'in': ES6CODE})
+        self.mkbundle('in', filters='babeljs', output='out').build()
+        ans = self.get('out')
 
         assert '''var Point = function () {
     function Point(x, y) {
 ''' in ans, ans
         
     def test_typescript_filter(self):
-        typeScript_source = StringIO('''
+        typeScript_source = '''
 class Greeter {
     constructor(public greeting: string) { }
     greet() {
@@ -43,13 +46,12 @@ class Greeter {
     }
 };
 var greeter = new Greeter("Hello, world!");
-''')
-        out = StringIO()
-        TypeScript().input(typeScript_source, out)
-        
-        out.seek(0)
-        ans = out.read()
-        
+'''
+
+        self.create_files({'in': typeScript_source})
+        self.mkbundle('in', filters='typescript', output='out').build()
+        ans = self.get('out')
+
         expected = """System.register([], function(exports_1) {
     var Greeter, greeter;
     return {
@@ -110,6 +112,7 @@ class TestLessFilter(TempEnvironmentHelper):
 }
 """
 
+
 class TestJSXFilter(TempEnvironmentHelper):
     JSX_CODE = '''
 import Component from 'react';