Missing Stub Weird API

[jonathan-benn]

Here are some weird Stub API functions that are missing:

sinon.addBehavior(name, fn);
# Add a custom behavior. The name will be available as a function on stubs,
# and the chaining mechanism will be set up for you

stub.get(getterFn)
# Replaces a new getter for this stub.

stub.set(setterFn)
# Defines a new setter for this stub.

stub.value(newVal)
# Defines a new value for this stub.

Are these needed?

[note35]

Note: New feature of SinonJS