v0.4.0

• Added expect.extend which allows projects to register their own, opinionated expectations that integrates into expect. (#142)
  • Modeled after jest's implementation.
  • Matchers are functions that should return an object with with two keys, boolean pass and a string message
  • Like context, matchers introduced via expect.extend will be present on all nodes below the node that introduces the matchers.
  • Limitations:
    • expect.extend cannot be called from within describe blocks
    • Custom matcher names cannot overwrite pre-existing matchers, including default matchers and matchers introduces from previous expect.extend calls.
• Change the way errors are collected to call tostring on them before further processing.
  • Luau allows non-string errors, but not concatenating non-strings or passing non-strings to debug.traceback as a message, so TestRunner needs to do that step. This is a temporary fix as the better solution would be to retain the error in object form for as long as possible to give the reporter more to work with.
  • This also makes a slight change to what's in the traceback to eliminate the unnecessary line mentioning the error collection function.
• Fix debugging of tests in Studio