RSpec: How could I use the array include matcher in the expect syntax
You need to splat the arguments when passing them to the array matcher:
expect(array1).to include(*array2)This is because you usually list out literals, e.g.:
expect([1, 2, 3]).to include(1, 2)That said, expect(array1).to include(array2) should not fail with a weird error like you got, and in fact it works and passes in an example like:
it 'includes a sub array' do array2 = ["a"] array1 = [array2] expect(array1).to include(array2) end
To test if one array is subset of another array its perhapse good idea to introduce set. And then you can write it like this... (Solution uses Set#subset?)
require "set"describe "Small test" do let(:array1) { %w{a b c d} } let(:array2) { %w{b c} } let(:array1_as_set) { array1.to_set } let(:array2_as_set) { array2.to_set } subject { array2_as_set } context "inclusion of w/ \"expect\"" do it { expect(subject).to be_subset(array1_as_set) } end context "inclusion of w/ \"should\"" do it { should be_subset(array1_as_set) } endend