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require_relative '../../spec_helper'
require_relative '../enumerable/shared/enumeratorized'
describe "ENV.keep_if" do
before :each do
@foo = ENV["foo"]
@bar = ENV["bar"]
ENV["foo"] = "0"
ENV["bar"] = "1"
end
after :each do
ENV["foo"] = @foo
ENV["bar"] = @bar
end
it "deletes pairs if the block returns false" do
ENV.keep_if { |k, v| !["foo", "bar"].include?(k) }
ENV["foo"].should == nil
ENV["bar"].should == nil
end
it "returns ENV when block given" do
ENV.keep_if { |k, v| !["foo", "bar"].include?(k) }.should equal(ENV)
end
it "returns ENV even if nothing deleted" do
ENV.keep_if { true }.should equal(ENV)
end
it "returns an Enumerator if no block given" do
ENV.keep_if.should be_an_instance_of(Enumerator)
end
it "deletes pairs through enumerator" do
enum = ENV.keep_if
enum.each { |k, v| !["foo", "bar"].include?(k) }
ENV["foo"].should == nil
ENV["bar"].should == nil
end
it "returns ENV from enumerator" do
enum = ENV.keep_if
enum.each { |k, v| !["foo", "bar"].include?(k) }.should equal(ENV)
end
it "returns ENV from enumerator even if nothing deleted" do
enum = ENV.keep_if
enum.each { true }.should equal(ENV)
end
it_behaves_like :enumeratorized_with_origin_size, :keep_if, ENV
end
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