Consider a mythical Dwarf whose public API consists of a single method:
Dwarf#mine(mountain)
The provided mountain object should respond to the instance method
#mine by randomly returning one of 3 strings:
- "gems" -- to indicate the dwarf has successfully mined a precious stone
- "coal" -- to indicate the dwarf has found mere fossil fuels
- -- we got a wildcard -- insert your own exciting geological substance here
The Dwarf API is already implemented under lib/dwarf.rb. The objective of
this exercise is to practice retroactively testing the API without
actually writing the Mountain class.
Due to the random nature of mining, our tests will be more reliable if
we control the Mountain interface manually using mocks and stubs.
Additionally mountains are large and generally a pain to move around.
Using mock stand-ins will make our test much lighter-weight.
Try filling in the tests 3 times.
- Using Minitest's built-in mocking library (
Minitest::Mock) - Using the Mocha gem (a mocking add-on for test-unit and minitest)
- Using Rspec's built-in
rspec-mockslibrary