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require "spec_helper"
require "hamster/set"
describe Hamster::Set do
let(:set) { S[*values] }
describe "#grep" do
let(:grep) { set.grep(String, &block) }
shared_examples "check filtered values" do
it "returns the filtered values" do
expect(grep).to eq(S[*filtered])
end
end
context "without a block" do
let(:block) { nil }
context "with an empty set" do
let(:values) { [] }
let(:filtered) { [] }
include_examples "check filtered values"
end
context "with a single item set" do
let(:values) { ["A"] }
let(:filtered) { ["A"] }
include_examples "check filtered values"
end
context "with a single item set that doesn't contain match" do
let(:values) { [1] }
let(:filtered) { [] }
include_examples "check filtered values"
end
context "with a multi-item set where one isn't a match" do
let(:values) { ["A", 2, "C"] }
let(:filtered) { %w[A C] }
include_examples "check filtered values"
end
end
describe "with a block" do
let(:block) { ->(item) { item.downcase }}
context "processes each matching item with the block" do
let(:values) { ["A", 2, "C"] }
let(:filtered) { %w[a c] }
include_examples "check filtered values"
end
end
end
end
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