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require File.expand_path('../../../spec_helper', __FILE__)
ruby_version_is ""..."1.9" do
with_feature :generator do
require File.expand_path('../fixtures/common', __FILE__)
describe "Generator#next?" do
it "returns false for empty generator" do
GeneratorSpecs.empty.next?.should == false
end
it "returns true for non-empty generator" do
g = Generator.new([1])
g.next?.should == true
GeneratorSpecs.two_elems.next?.should == true
g = Generator.new(['A', 'B', 'C', 'D', 'E', 'F'])
g.next?.should == true
end
it "returns true if the generator has not reached the end yet" do
g = GeneratorSpecs.two_elems
g.next
g.next?.should == true
end
it "returns false if the generator has reached the end" do
g = GeneratorSpecs.two_elems
g.next
g.next
g.next?.should == false
end
it "returns false if end? returns true" do
g = GeneratorSpecs.two_elems
def g.end?; true end
g.next?.should == false
end
end
describe "Generator#next" do
it "raises an EOFError on empty generator" do
lambda { GeneratorSpecs.empty.next }.should raise_error(EOFError)
end
it "raises an EOFError if no elements available" do
g = GeneratorSpecs.two_elems
g.next;
g.next
lambda { g.next }.should raise_error(EOFError)
end
it "raises an EOFError if end? returns true" do
g = GeneratorSpecs.two_elems
def g.end?; true end
lambda { g.next }.should raise_error(EOFError)
end
it "returns the element at the current position and moves forward" do
g = GeneratorSpecs.two_elems
g.index.should == 0
g.next.should == 1
g.index.should == 1
end
it "subsequent calls should return all elements in proper order" do
g = GeneratorSpecs.four_elems
result = []
while g.next?
result << g.next
end
result.should == ['A', 'B', 'C', 'Z']
end
end
end
end
|
