template inheritance with Express and Jade

I'm having difficulty getting template inheritance to work properly. I'm finding that I can get index/layout working well, but that it's not including other extended blocks. For example, here's my layout.jade file:

#wrapper
      block tester

      // Side bar
      #list
        ul#friend-list.browser
          li#friends.label Friends
          li#following.label Following

      // Content
      block content

In the same directory I have index.jade and tester.jade. index.jade contains the following, and works:

extends layout

block content
  .content
        .row-fluid
          .span12
            .row-fluid
              #browser-toolbar.span12.toolbar
            .row-fluid
              .span12
                #bento

tester.jade looks like this, and doesn't work:

extend layout

block tester
  h1 hello world

I'm currently using Express v.3.0b4. Can anyone help explain why this isn't working? It doesn't throw an error -- it just doesn't render the tester.jade file at all.