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describe :enum_for, shared: true do
it "is defined in Kernel" do
Kernel.method_defined?(@method).should be_true
end
it "returns a new enumerator" do
"abc".send(@method).should be_an_instance_of(Enumerator)
end
it "defaults the first argument to :each" do
enum = [1,2].send(@method)
enum.map { |v| v }.should == [1,2].each { |v| v }
end
it "exposes multi-arg yields as an array" do
o = Object.new
def o.each
yield :a
yield :b1, :b2
yield [:c]
yield :d1, :d2
yield :e1, :e2, :e3
end
enum = o.send(@method)
enum.next.should == :a
enum.next.should == [:b1, :b2]
enum.next.should == [:c]
enum.next.should == [:d1, :d2]
enum.next.should == [:e1, :e2, :e3]
end
it "uses the passed block's value to calculate the size of the enumerator" do
Object.new.enum_for { 100 }.size.should == 100
end
it "defers the evaluation of the passed block until #size is called" do
ScratchPad.record []
enum = Object.new.enum_for do
ScratchPad << :called
100
end
ScratchPad.recorded.should be_empty
enum.size
ScratchPad.recorded.should == [:called]
end
end
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