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require_relative '../../spec_helper'
describe "Enumerator.new" do
context "no block given" do
ruby_version_is '3.0' do
it "raises" do
-> { Enumerator.new(1, :upto, 3) }.should raise_error(ArgumentError)
end
end
ruby_version_is ''...'3.0' do
it "creates a new custom enumerator with the given object, iterator and arguments" do
enum = suppress_warning { Enumerator.new(1, :upto, 3) }
enum.should be_an_instance_of(Enumerator)
end
it "creates a new custom enumerator that responds to #each" do
enum = suppress_warning { Enumerator.new(1, :upto, 3) }
enum.respond_to?(:each).should == true
end
it "creates a new custom enumerator that runs correctly" do
suppress_warning { Enumerator.new(1, :upto, 3) }.map{ |x| x }.should == [1,2,3]
end
it "aliases the second argument to :each" do
suppress_warning { Enumerator.new(1..2) }.to_a.should ==
suppress_warning { Enumerator.new(1..2, :each) }.to_a
end
it "doesn't check for the presence of the iterator method" do
suppress_warning { Enumerator.new(nil) }.should be_an_instance_of(Enumerator)
end
it "uses the latest define iterator method" do
class StrangeEach
def each
yield :foo
end
end
enum = suppress_warning { Enumerator.new(StrangeEach.new) }
enum.to_a.should == [:foo]
class StrangeEach
def each
yield :bar
end
end
enum.to_a.should == [:bar]
end
end
end
context "when passed a block" do
it "defines iteration with block, yielder argument and calling << method" do
enum = Enumerator.new do |yielder|
a = 1
loop do
yielder << a
a = a + 1
end
end
enum.take(3).should == [1, 2, 3]
end
it "defines iteration with block, yielder argument and calling yield method" do
enum = Enumerator.new do |yielder|
a = 1
loop do
yielder.yield(a)
a = a + 1
end
end
enum.take(3).should == [1, 2, 3]
end
ruby_version_is "2.7" do
it "defines iteration with block, yielder argument and treating it as a proc" do
enum = Enumerator.new do |yielder|
"a\nb\nc".each_line(&yielder)
end
enum.to_a.should == ["a\n", "b\n", "c"]
end
end
describe 'yielded values' do
it 'handles yield arguments properly' do
Enumerator.new { |y| y.yield(1) }.to_a.should == [1]
Enumerator.new { |y| y.yield(1) }.first.should == 1
Enumerator.new { |y| y.yield([1]) }.to_a.should == [[1]]
Enumerator.new { |y| y.yield([1]) }.first.should == [1]
Enumerator.new { |y| y.yield(1, 2) }.to_a.should == [[1, 2]]
Enumerator.new { |y| y.yield(1, 2) }.first.should == [1, 2]
Enumerator.new { |y| y.yield([1, 2]) }.to_a.should == [[1, 2]]
Enumerator.new { |y| y.yield([1, 2]) }.first.should == [1, 2]
end
it 'handles << arguments properly' do
Enumerator.new { |y| y.<<(1) }.to_a.should == [1]
Enumerator.new { |y| y.<<(1) }.first.should == 1
Enumerator.new { |y| y.<<([1]) }.to_a.should == [[1]]
Enumerator.new { |y| y.<<([1]) }.first.should == [1]
# << doesn't accept multiple arguments
# Enumerator.new { |y| y.<<(1, 2) }.to_a.should == [[1, 2]]
# Enumerator.new { |y| y.<<(1, 2) }.first.should == [1, 2]
Enumerator.new { |y| y.<<([1, 2]) }.to_a.should == [[1, 2]]
Enumerator.new { |y| y.<<([1, 2]) }.first.should == [1, 2]
end
end
end
end
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