ruby--ruby/spec/ruby/core/enumerable/tally_spec.rb

require_relative '../../spec_helper'
require_relative 'fixtures/classes'

ruby_version_is "2.7" do
  describe "Enumerable#tally" do
    before :each do
      ScratchPad.record []
    end

    it "returns a hash with counts according to the value" do
      enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
      enum.tally.should == { 'foo' => 2, 'bar' => 1, 'baz' => 1}
    end

    it "returns a hash without default" do
      hash = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz').tally
      hash.default_proc.should be_nil
      hash.default.should be_nil
    end

    it "returns an empty hash for empty enumerables" do
      EnumerableSpecs::Empty.new.tally.should == {}
    end

    it "counts values as gathered array when yielded with multiple arguments" do
      EnumerableSpecs::YieldsMixed2.new.tally.should == EnumerableSpecs::YieldsMixed2.gathered_yields.group_by(&:itself).transform_values(&:size)
    end

    it "does not call given block" do
      enum = EnumerableSpecs::Numerous.new('foo', 'bar', 'foo', 'baz')
      enum.tally { |v| ScratchPad << v }
      ScratchPad.recorded.should == []
    end
  end
end