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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_class)
end
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_class)
end
describe "with truthy block" do
it "keeps elements after any exception" do
lambda { @frozen.send(@method) { true } }.should raise_error(Exception)
@frozen.should == @origin
end
it "raises a RuntimeError" do
lambda { @frozen.send(@method) { true } }.should raise_error(RuntimeError)
end
end
describe "with falsy block" do
it "keeps elements after any exception" do
lambda { @frozen.send(@method) { false } }.should raise_error(Exception)
@frozen.should == @origin
end
it "raises a RuntimeError" do
lambda { @frozen.send(@method) { false } }.should raise_error(RuntimeError)
end
end
end
end
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