Using karma to load requirejs tests with the .spec.js suffix. Note the base url needs the / otherwise karma-requirejs will whine about no timestamp (paths will differ) We mangle the files list to be relative, otherwise using relative paths in the form of "./bar" will fail. In my use case I have a shared config.js file that has more configuration…

karma.js

var tests = Object.keys(window.__karma__.files).filter(function (file) {
  return /\.spec\.js$/.test(file);
}).map(function(file){
  return file.replace(/^\/base\/src\/js\/|\.js$/g,'');
});

require.config({
  baseUrl: '/base/src/js',
  paths: {
    "lib":"../../target/js/lib"
  }
});

require(['config'],function(){
  require(tests, function(){
    window.__karma__.start();
  });
});

karma_simple.js

var tests = Object.keys(window.__karma__.files).filter(function (file) {
  return /\.spec\.js$/.test(file);
}).map(function(file){
  return file.replace(/^\/base\/src\/js\/|\.js$/g,'');
});

require.config({
  baseUrl: '/base/src/js'
});

require(tests, function(){
  window.__karma__.start();
});

Thanks so much! This really helped me get my Karma/Require configuration straightened out... After 12 hours of searching.