Stub `rand` with multiple future values

Question

I know:

require 'mocha/setup'

Kernel.stub(:rand, -1) do
  p Kernel.rand #=> -1
  p Kernel.rand #=> -1
  p Kernel.rand #=> -1
end

I need:

Kernel.stub(:rand, [-1, -2, -3]) do
  p Kernel.rand #=> -1
  p Kernel.rand #=> -2
  p Kernel.rand #=> -3
end

How can I program multiple future values for random in my test?

score 0 · Answer 1 · answered Mar 18 '16 at 03:12

0

Kernel.stubs(:rand).returns(-1, -2, -3)

answered Mar 18 '16 at 03:12

windock

don't works : NoMethodError: undefined method `stubs' for Kernel:Module, need a gem? – Matrix Mar 18 '16 at 03:13
That means that mocha is no loaded. Load it through tests or "require 'mocha/setup'" – windock Mar 18 '16 at 03:28
"NoMethodError: undefined method `__metaclass__' for Kernel:Module" when adding this require... – Matrix Mar 18 '16 at 03:30
the test run yes : "1) Error: CharacterTest#test_test: NoMethodError: undefined method `__metaclass__' for Kernel:Module" – Matrix Mar 18 '16 at 03:44

score 0 · Answer 2 · answered Mar 18 '16 at 06:29

0

You could use sample method to return a random value from an array.

[-1,-2,-3].sample #=> -1
[-1,-2,-3].sample #=> -3
[-1,-2,-3].sample #=> -2
[-1,-2,-3].sample #=> -1
[-1,-2,-3].sample #=> -1

So you can do

Kernel.stubs(:rand).returns([-1,-2,-3].sample)

answered Mar 18 '16 at 06:29

Rohit Jangid

Kernel.stubs(:rand).returns(...) don't works, look the com. on windock answer. – Matrix Mar 18 '16 at 16:05

2 Answers2