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require_relative '../../enumerable/shared/enumeratorized'
require_relative '../shared/iterable_and_tolerating_size_increasing'
describe :keep_if, shared: true do
it "deletes elements for which the block returns a false value" do
array = [1, 2, 3, 4, 5]
array.send(@method) {|item| item > 3 }.should equal(array)
array.should == [4, 5]
end
it "returns an enumerator if no block is given" do
[1, 2, 3].send(@method).should be_an_instance_of(Enumerator)
end
it "updates the receiver after all blocks" do
a = [1, 2, 3]
a.send(@method) do |e|
a.length.should == 3
false
end
a.length.should == 0
end
before :all do
@object = [1,2,3]
end
it_should_behave_like :enumeratorized_with_origin_size
describe "on frozen objects" do
before :each do
@origin = [true, false]
@frozen = @origin.dup.freeze
end
it "returns an Enumerator if no block is given" do
@frozen.send(@method).should be_an_instance_of(Enumerator)
end
describe "with truthy block" do
it "keeps elements after any exception" do
-> { @frozen.send(@method) { true } }.should raise_error(Exception)
@frozen.should == @origin
end
it "raises a FrozenError" do
-> { @frozen.send(@method) { true } }.should raise_error(FrozenError)
end
end
describe "with falsy block" do
it "keeps elements after any exception" do
-> { @frozen.send(@method) { false } }.should raise_error(Exception)
@frozen.should == @origin
end
it "raises a FrozenError" do
-> { @frozen.send(@method) { false } }.should raise_error(FrozenError)
end
end
it "raises a FrozenError on a frozen array only during iteration if called without a block" do
enum = @frozen.send(@method)
-> { enum.each {} }.should raise_error(FrozenError)
end
end
it "does not truncate the array is the block raises an exception" do
a = [1, 2, 3]
begin
a.send(@method) { raise StandardError, 'Oops' }
rescue
end
a.should == [1, 2, 3]
end
it "only changes elements before error is raised, keeping the element which raised an error." do
a = [1, 2, 3, 4]
begin
a.send(@method) do |e|
case e
when 2 then false
when 3 then raise StandardError, 'Oops'
else true
end
end
rescue StandardError
end
a.should == [1, 3, 4]
end
@value_to_return = -> _ { true }
it_should_behave_like :array_iterable_and_tolerating_size_increasing
end
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