false vs. nil

[AndreasMatthias]

The following code

require('busted.runner')()
x = false
print(x, type(x))

outputs

nil nil

while the expected result would be

false   boolean

Installed version of busted:

$ busted --version
2.0.0-0

[aki-cat]

When you write x = false what you're really doing is _G.x = false (aka declaring a global var x in the current environment). If the current environment does not allow writing on _G, you won't be able to declare anything in the global scope of that environment.

Use local x = false instead.

EDIT: Depending on which lua version you're using, the environment might be set either using setfenv() or _ENV. Either way, use locals, don't pollute the global environment.

[AndreasMatthias]

OK, understook. Thank you!