Testing hash contents using RSpec

问题

I have a test like so:

it "should not indicate backwards jumps if the checker position is not a king" do
    board = Board.new
    game_board = board.create_test_board
    board.add_checker(game_board, :red, 3, 3)
    x_coord = 3
    y_coord = 3
    jump_locations = {}
    jump_locations["upper_left"]  = true 
    jump_locations["upper_right"] = false 
    jump_locations["lower_left"]  = false
    jump_locations["lower_right"] = true
    adjusted_jump_locations = @bs.adjust_jump_locations_if_not_king(game_board, x_coord, y_coord, jump_locations)
    adjusted_jump_locations["upper_left"].should == true 
    adjusted_jump_locations["upper_right"].should == false 
    adjusted_jump_locations["lower_left"].should == false
    adjusted_jump_locations["lower_right"].should == false
  end

which, I know, is verbose. Is there a more concise way to state my expectations. I've looked at the docs but I can't see where to compress my expectations. Thanks.

回答1:

http://rubydoc.info/gems/rspec-expectations/RSpec/Matchers:include

It works for hashes too:

jump_locations.should include(
  "upper_left" => true,
  "upper_right" => false,
  "lower_left" => false,
  "lower_right" => true
)

回答2:

Just wanna add to @David's answer. You could nest and use matchers in your include hash. For example:

# Pass
expect({
  "num" => 5, 
  "a" => { 
    "b" => [3, 4, 5] 
  }
}).to include({
  "num" => a_value_between(3, 10), 
  "a" => {
    "b" => be_an(Array)
  }
})

A caveat: a nested include hash must test all keys or the test will fail, e.g.:

# Fail
expect({
  "a" => { 
    "b" => 1,
    "c" => 2
  }
}).to include({
  "a" => {
    "b" => 1
  }
})

回答3:

Syntax has changed for RSpec 3, but include matcher is still the one:

expect(jump_locations).to include(
  "upper_left" => true,
  "upper_right" => false,
  "lower_left" => false,
  "lower_right" => true
)

See built-in-matchers#include-matcher.

回答4:

An other easy way to test if the whole content is a Hash is to checkout if the content is the Hash Object itself:

it 'is to be a Hash Object' do
    workbook = {name: 'A', address: 'La'}
    expect(workbook.is_a?(Hash)).to be_truthy
end

来源：https://stackoverflow.com/questions/8392884/testing-hash-contents-using-rspec

标签

ruby

rspec

expectations