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require_relative '../../spec_helper'
require 'set'
describe "Set#keep_if" do
before :each do
@set = Set["one", "two", "three"]
end
it "yields every element of self" do
ret = []
@set.keep_if { |x| ret << x }
ret.sort.should == ["one", "two", "three"].sort
end
it "keeps every element from self for which the passed block returns true" do
@set.keep_if { |x| x.size != 3 }
@set.size.should eql(1)
@set.should_not include("one")
@set.should_not include("two")
@set.should include("three")
end
it "returns self" do
@set.keep_if {}.should equal(@set)
end
it "returns an Enumerator when passed no block" do
enum = @set.keep_if
enum.should be_an_instance_of(Enumerator)
enum.each { |x| x.size != 3 }
@set.should_not include("one")
@set.should_not include("two")
@set.should include("three")
end
end
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