Jasmine constructs aren't available with beta 2 anymore

After the upgrade to beta 2 I suddenly see the following errors:
Error:(4, 5) TS2304: Cannot find name 'it'.
Error:(13, 9) TS2304: Cannot find name 'expect'.
Error:(39, 36) TS2339: Property 'toBeNull' does not exist on type 'NgMatchers'.
