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require_relative '../../spec_helper'
ruby_version_is "3.3" do
describe "Range#reverse_each" do
it "traverses the Range in reverse order and passes each element to block" do
a = []
(1..3).reverse_each { |i| a << i }
a.should == [3, 2, 1]
a = []
(1...3).reverse_each { |i| a << i }
a.should == [2, 1]
end
it "returns self" do
r = (1..3)
r.reverse_each { |x| }.should equal(r)
end
it "returns an Enumerator if no block given" do
enum = (1..3).reverse_each
enum.should be_an_instance_of(Enumerator)
enum.to_a.should == [3, 2, 1]
end
it "raises a TypeError for endless Ranges of Integers" do
-> {
(1..).reverse_each.take(3)
}.should raise_error(TypeError, "can't iterate from NilClass")
end
it "raises a TypeError for endless Ranges of non-Integers" do
-> {
("a"..).reverse_each.take(3)
}.should raise_error(TypeError, "can't iterate from NilClass")
end
context "Integer boundaries" do
it "supports beginningless Ranges" do
(..5).reverse_each.take(3).should == [5, 4, 3]
end
end
context "non-Integer boundaries" do
it "uses #succ to iterate a Range of non-Integer elements" do
y = mock('y')
x = mock('x')
x.should_receive(:succ).any_number_of_times.and_return(y)
x.should_receive(:<=>).with(y).any_number_of_times.and_return(-1)
x.should_receive(:<=>).with(x).any_number_of_times.and_return(0)
y.should_receive(:<=>).with(x).any_number_of_times.and_return(1)
y.should_receive(:<=>).with(y).any_number_of_times.and_return(0)
a = []
(x..y).each { |i| a << i }
a.should == [x, y]
end
it "uses #succ to iterate a Range of Strings" do
a = []
('A'..'D').reverse_each { |i| a << i }
a.should == ['D','C','B','A']
end
it "uses #succ to iterate a Range of Symbols" do
a = []
(:A..:D).reverse_each { |i| a << i }
a.should == [:D, :C, :B, :A]
end
it "raises a TypeError when `begin` value does not respond to #succ" do
-> { (Time.now..Time.now).reverse_each { |x| x } }.should raise_error(TypeError, /can't iterate from Time/)
-> { (//..//).reverse_each { |x| x } }.should raise_error(TypeError, /can't iterate from Regexp/)
-> { ([]..[]).reverse_each { |x| x } }.should raise_error(TypeError, /can't iterate from Array/)
end
it "does not support beginningless Ranges" do
-> {
(..'a').reverse_each { |x| x }
}.should raise_error(TypeError, /can't iterate from NilClass/)
end
end
context "when no block is given" do
describe "returned Enumerator size" do
it "returns the Range size when Range size is finite" do
(1..3).reverse_each.size.should == 3
end
ruby_bug "#20936", "3.4"..."4.0" do
it "returns Infinity when Range size is infinite" do
(..3).reverse_each.size.should == Float::INFINITY
end
end
it "returns nil when Range size is unknown" do
('a'..'z').reverse_each.size.should == nil
end
end
end
end
end
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