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require_relative '../../spec_helper'
describe "Enumerator#next" do
before :each do
@enum = 1.upto(3)
end
it "returns the next element of the enumeration" do
@enum.next.should == 1
@enum.next.should == 2
@enum.next.should == 3
end
it "raises a StopIteration exception at the end of the stream" do
3.times { @enum.next }
-> { @enum.next }.should raise_error(StopIteration)
end
it "cannot be called again until the enumerator is rewound" do
3.times { @enum.next }
-> { @enum.next }.should raise_error(StopIteration)
-> { @enum.next }.should raise_error(StopIteration)
-> { @enum.next }.should raise_error(StopIteration)
@enum.rewind
@enum.next.should == 1
end
it "restarts the enumerator if an exception terminated a previous iteration" do
exception = StandardError.new
enum = Enumerator.new do
raise exception
end
result = 2.times.map { enum.next rescue $! }
result.should == [exception, exception]
end
end
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