I had the same problem. Just install this node package and add this line to your Gruntfile and require should start working again.
https://github.com/cloudchen/grunt-template-jasmine-requirejs
jasmine: {
js: {
src: jsFiles,
options: {
specs: 'tests/*_spec.js',
helpers: 'tests/helpers/*',
vendor: 'vendor/*',
template: require('grunt-template-jasmine-requirejs')
}
}
},