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104 lines
3.1 KiB
Ruby
104 lines
3.1 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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require_relative 'shared/enumeratorized'
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describe "Enumerable#cycle" do
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describe "passed no argument or nil" do
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it "loops indefinitely" do
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[[],[nil]].each do |args|
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bomb = 10
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EnumerableSpecs::Numerous.new.cycle(*args) do
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bomb -= 1
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break 42 if bomb <= 0
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end.should == 42
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bomb.should == 0
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end
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end
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it "returns nil if there are no elements" do
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out = EnumerableSpecs::Empty.new.cycle { break :nope }
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out.should be_nil
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end
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it "yields successive elements of the array repeatedly" do
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b = []
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EnumerableSpecs::Numerous.new(1,2,3).cycle do |elem|
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b << elem
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break if b.size == 7
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end
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b.should == [1,2,3,1,2,3,1]
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end
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it "calls each at most once" do
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enum = EnumerableSpecs::EachCounter.new(1, 2)
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enum.cycle.first(6).should == [1,2,1,2,1,2]
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enum.times_called.should == 1
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end
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it "yields only when necessary" do
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enum = EnumerableSpecs::EachCounter.new(10, 20, 30)
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enum.cycle { |x| break if x == 20}
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enum.times_yielded.should == 2
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end
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end
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describe "passed a number n as an argument" do
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it "returns nil and does nothing for non positive n" do
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EnumerableSpecs::ThrowingEach.new.cycle(0) {}.should be_nil
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EnumerableSpecs::NoEach.new.cycle(-22) {}.should be_nil
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end
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it "calls each at most once" do
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enum = EnumerableSpecs::EachCounter.new(1, 2)
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enum.cycle(3).to_a.should == [1,2,1,2,1,2]
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enum.times_called.should == 1
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end
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it "yields only when necessary" do
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enum = EnumerableSpecs::EachCounter.new(10, 20, 30)
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enum.cycle(3) { |x| break if x == 20}
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enum.times_yielded.should == 2
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end
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it "tries to convert n to an Integer using #to_int" do
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enum = EnumerableSpecs::Numerous.new(3, 2, 1)
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enum.cycle(2.3).to_a.should == [3, 2, 1, 3, 2, 1]
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obj = mock('to_int')
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obj.should_receive(:to_int).and_return(2)
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enum.cycle(obj).to_a.should == [3, 2, 1, 3, 2, 1]
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end
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it "raises a TypeError when the passed n cannot be coerced to Integer" do
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enum = EnumerableSpecs::Numerous.new
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->{ enum.cycle("cat"){} }.should raise_error(TypeError)
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end
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it "raises an ArgumentError if more arguments are passed" do
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enum = EnumerableSpecs::Numerous.new
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->{ enum.cycle(1, 2) {} }.should raise_error(ArgumentError)
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end
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it "gathers whole arrays as elements when each yields multiple" do
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multi = EnumerableSpecs::YieldsMulti.new
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multi.cycle(2).to_a.should == [[1, 2], [3, 4, 5], [6, 7, 8, 9], [1, 2], [3, 4, 5], [6, 7, 8, 9]]
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end
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end
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describe "Enumerable with size" do
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before :all do
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@object = EnumerableSpecs::NumerousWithSize.new(1, 2, 3, 4)
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@empty_object = EnumerableSpecs::EmptyWithSize.new
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end
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it_should_behave_like :enumeratorized_with_cycle_size
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end
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describe "Enumerable with no size" do
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before :all do
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@object = EnumerableSpecs::Numerous.new(1, 2, 3, 4)
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@method = :cycle
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end
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it_should_behave_like :enumeratorized_with_unknown_size
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end
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end
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