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-rw-r--r--spec/ruby/core/range/step_spec.rb683
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diff --git a/spec/ruby/core/range/step_spec.rb b/spec/ruby/core/range/step_spec.rb
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+require_relative '../../spec_helper'
+
+describe "Range#step" do
+ before :each do
+ ScratchPad.record []
+ end
+
+ it "returns self" do
+ r = 1..2
+ r.step { }.should equal(r)
+ end
+
+ ruby_version_is ""..."3.4" do
+ it "calls #to_int to coerce step to an Integer" do
+ obj = mock("Range#step")
+ obj.should_receive(:to_int).and_return(1)
+
+ (1..2).step(obj) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1, 2])
+ end
+
+ it "raises a TypeError if step does not respond to #to_int" do
+ obj = mock("Range#step non-integer")
+
+ -> { (1..2).step(obj) { } }.should raise_error(TypeError)
+ end
+
+ it "raises a TypeError if #to_int does not return an Integer" do
+ obj = mock("Range#step non-integer")
+ obj.should_receive(:to_int).and_return("1")
+
+ -> { (1..2).step(obj) { } }.should raise_error(TypeError)
+ end
+
+ it "raises a TypeError if the first element does not respond to #succ" do
+ obj = mock("Range#step non-comparable")
+ obj.should_receive(:<=>).with(obj).and_return(1)
+
+ -> { (obj..obj).step { |x| x } }.should raise_error(TypeError)
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "calls #coerce to coerce step to an Integer" do
+ obj = mock("Range#step")
+ obj.should_receive(:coerce).at_least(:once).and_return([1, 2])
+
+ (1..3).step(obj) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1, 3])
+ end
+
+ it "raises a TypeError if step does not respond to #coerce" do
+ obj = mock("Range#step non-coercible")
+
+ -> { (1..2).step(obj) { } }.should raise_error(TypeError)
+ end
+ end
+
+ it "raises an ArgumentError if step is 0" do
+ -> { (-1..1).step(0) { |x| x } }.should raise_error(ArgumentError)
+ end
+
+ it "raises an ArgumentError if step is 0.0" do
+ -> { (-1..1).step(0.0) { |x| x } }.should raise_error(ArgumentError)
+ end
+
+ ruby_version_is "3.4" do
+ it "does not raise an ArgumentError if step is 0 for non-numeric ranges" do
+ t = Time.utc(2023, 2, 24)
+ -> { (t..t+1).step(0) { break } }.should_not raise_error(ArgumentError)
+ end
+ end
+
+ ruby_version_is ""..."3.4" do
+ it "raises an ArgumentError if step is negative" do
+ -> { (-1..1).step(-2) { |x| x } }.should raise_error(ArgumentError)
+ end
+ end
+
+ describe "with inclusive end" do
+ describe "and Integer values" do
+ it "yields Integer values incremented by 1 and less than or equal to end when not passed a step" do
+ (-2..2).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2, -1, 0, 1, 2])
+ end
+
+ it "yields Integer values incremented by an Integer step" do
+ (-5..5).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5, -3, -1, 1, 3, 5])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-2..2).step(1.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
+ end
+
+ ruby_version_is "3.4" do
+ it "does not iterate if step is negative for forward range" do
+ (-1..1).step(-1) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([])
+ end
+
+ it "iterates backward if step is negative for backward range" do
+ (1..-1).step(-1) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1, 0, -1])
+ end
+ end
+ end
+
+ describe "and Float values" do
+ it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
+ (-2.0..2.0).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5.0..5.0).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1.0..1.0).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
+ end
+
+ it "returns Float values of 'step * n + begin <= end'" do
+ (1.0..6.4).step(1.8) { |x| ScratchPad << x }
+ (1.0..12.7).step(1.3) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1.0, 2.8, 4.6, 6.4, 1.0, 2.3, 3.6,
+ 4.9, 6.2, 7.5, 8.8, 10.1, 11.4, 12.7])
+ end
+
+ it "handles infinite values at either end" do
+ (-Float::INFINITY..0.0).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([-Float::INFINITY, -Float::INFINITY, -Float::INFINITY])
+
+ ScratchPad.record []
+ (0.0..Float::INFINITY).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([0.0, 2.0, 4.0])
+ end
+ end
+
+ describe "and Integer, Float values" do
+ it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
+ (-2..2.0).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5..5.0).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1..1.0).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
+ end
+ end
+
+ describe "and Float, Integer values" do
+ it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
+ (-2.0..2).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5.0..5).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1.0..1).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
+ end
+ end
+
+ describe "and String values" do
+ it "yields String values incremented by #succ and less than or equal to end when not passed a step" do
+ ("A".."E").step { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "B", "C", "D", "E"]
+ end
+
+ it "yields String values incremented by #succ called Integer step times" do
+ ("A".."G").step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "C", "E", "G"]
+ end
+
+ it "raises a TypeError when passed a Float step" do
+ -> { ("A".."G").step(2.0) { } }.should raise_error(TypeError)
+ end
+
+ ruby_version_is ""..."3.4" do
+ it "calls #succ on begin and each element returned by #succ" do
+ obj = mock("Range#step String start")
+ obj.should_receive(:<=>).exactly(3).times.and_return(-1, -1, -1, 0)
+ obj.should_receive(:succ).exactly(2).times.and_return(obj)
+
+ (obj..obj).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should == [obj, obj, obj]
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "yields String values adjusted by step and less than or equal to end" do
+ ("A".."AAA").step("A") { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "AA", "AAA"]
+ end
+
+ it "raises a TypeError when passed an incompatible type step" do
+ -> { ("A".."G").step([]) { } }.should raise_error(TypeError)
+ end
+
+ it "calls #+ on begin and each element returned by #+" do
+ start = mock("Range#step String start")
+ stop = mock("Range#step String stop")
+
+ mid1 = mock("Range#step String mid1")
+ mid2 = mock("Range#step String mid2")
+
+ step = mock("Range#step String step")
+
+ # Deciding on the direction of iteration
+ start.should_receive(:<=>).with(stop).at_least(:twice).and_return(-1)
+ # Deciding whether the step moves iteration in the right direction
+ start.should_receive(:<=>).with(mid1).and_return(-1)
+ # Iteration 1
+ start.should_receive(:+).at_least(:once).with(step).and_return(mid1)
+ # Iteration 2
+ mid1.should_receive(:<=>).with(stop).and_return(-1)
+ mid1.should_receive(:+).with(step).and_return(mid2)
+ # Iteration 3
+ mid2.should_receive(:<=>).with(stop).and_return(0)
+
+ (start..stop).step(step) { |x| ScratchPad << x }
+ ScratchPad.recorded.should == [start, mid1, mid2]
+ end
+
+ it "iterates backward if the step is decreasing values, and the range is backward" do
+ start = mock("Range#step String start")
+ stop = mock("Range#step String stop")
+
+ mid1 = mock("Range#step String mid1")
+ mid2 = mock("Range#step String mid2")
+
+ step = mock("Range#step String step")
+
+ # Deciding on the direction of iteration
+ start.should_receive(:<=>).with(stop).at_least(:twice).and_return(1)
+ # Deciding whether the step moves iteration in the right direction
+ start.should_receive(:<=>).with(mid1).and_return(1)
+ # Iteration 1
+ start.should_receive(:+).at_least(:once).with(step).and_return(mid1)
+ # Iteration 2
+ mid1.should_receive(:<=>).with(stop).and_return(1)
+ mid1.should_receive(:+).with(step).and_return(mid2)
+ # Iteration 3
+ mid2.should_receive(:<=>).with(stop).and_return(0)
+
+ (start..stop).step(step) { |x| ScratchPad << x }
+ ScratchPad.recorded.should == [start, mid1, mid2]
+ end
+
+ it "does no iteration of the direction of the range and of the step don't match" do
+ start = mock("Range#step String start")
+ stop = mock("Range#step String stop")
+
+ mid1 = mock("Range#step String mid1")
+ mid2 = mock("Range#step String mid2")
+
+ step = mock("Range#step String step")
+
+ # Deciding on the direction of iteration: stop > start
+ start.should_receive(:<=>).with(stop).at_least(:twice).and_return(1)
+ # Deciding whether the step moves iteration in the right direction
+ # start + step < start, the direction is opposite to the range's
+ start.should_receive(:+).with(step).and_return(mid1)
+ start.should_receive(:<=>).with(mid1).and_return(-1)
+
+ (start..stop).step(step) { |x| ScratchPad << x }
+ ScratchPad.recorded.should == []
+ end
+ end
+ end
+ end
+
+ describe "with exclusive end" do
+ describe "and Integer values" do
+ it "yields Integer values incremented by 1 and less than end when not passed a step" do
+ (-2...2).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2, -1, 0, 1])
+ end
+
+ it "yields Integer values incremented by an Integer step" do
+ (-5...5).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5, -3, -1, 1, 3])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-2...2).step(1.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
+ end
+ end
+
+ describe "and Float values" do
+ it "yields Float values incremented by 1 and less than end when not passed a step" do
+ (-2.0...2.0).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5.0...5.0).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1.0...1.0).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
+ end
+
+ it "returns Float values of 'step * n + begin < end'" do
+ (1.0...6.4).step(1.8) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1.0, 2.8, 4.6])
+ end
+
+ it "correctly handles values near the upper limit" do # https://bugs.ruby-lang.org/issues/16612
+ (1.0...55.6).step(18.2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([1.0, 19.2, 37.4, 55.599999999999994])
+
+ (1.0...55.6).step(18.2).size.should == 4
+ end
+
+ it "handles infinite values at either end" do
+ (-Float::INFINITY...0.0).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([-Float::INFINITY, -Float::INFINITY, -Float::INFINITY])
+
+ ScratchPad.record []
+ (0.0...Float::INFINITY).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([0.0, 2.0, 4.0])
+ end
+ end
+
+ describe "and Integer, Float values" do
+ it "yields Float values incremented by 1 and less than end when not passed a step" do
+ (-2...2.0).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5...5.0).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
+ end
+
+ it "yields an Float and then Float values incremented by a Float step" do
+ (-1...1.0).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
+ end
+ end
+
+ describe "and Float, Integer values" do
+ it "yields Float values incremented by 1 and less than end when not passed a step" do
+ (-2.0...2).step { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5.0...5).step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1.0...1).step(0.5) { |x| ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
+ end
+ end
+
+ describe "and String values" do
+ ruby_version_is ""..."3.4" do
+ it "yields String values incremented by #succ and less than or equal to end when not passed a step" do
+ ("A"..."E").step { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "B", "C", "D"]
+ end
+
+ it "yields String values incremented by #succ called Integer step times" do
+ ("A"..."G").step(2) { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "C", "E"]
+ end
+
+ it "raises a TypeError when passed a Float step" do
+ -> { ("A"..."G").step(2.0) { } }.should raise_error(TypeError)
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "yields String values adjusted by step and less than or equal to end" do
+ ("A"..."AAA").step("A") { |x| ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "AA"]
+ end
+
+ it "raises a TypeError when passed an incompatible type step" do
+ -> { ("A".."G").step([]) { } }.should raise_error(TypeError)
+ end
+ end
+ end
+ end
+
+ describe "with an endless range" do
+ describe "and Integer values" do
+ it "yield Integer values incremented by 1 when not passed a step" do
+ (-2..).step { |x| break if x > 2; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2, -1, 0, 1, 2])
+
+ ScratchPad.record []
+ (-2...).step { |x| break if x > 2; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2, -1, 0, 1, 2])
+ end
+
+ it "yields Integer values incremented by an Integer step" do
+ (-5..).step(2) { |x| break if x > 3; ScratchPad << x }
+ ScratchPad.recorded.should eql([-5, -3, -1, 1, 3])
+
+ ScratchPad.record []
+ (-5...).step(2) { |x| break if x > 3; ScratchPad << x }
+ ScratchPad.recorded.should eql([-5, -3, -1, 1, 3])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-2..).step(1.5) { |x| break if x > 1.0; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
+
+ ScratchPad.record []
+ (-2..).step(1.5) { |x| break if x > 1.0; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
+ end
+ end
+
+ describe "and Float values" do
+ it "yields Float values incremented by 1 and less than end when not passed a step" do
+ (-2.0..).step { |x| break if x > 1.5; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
+
+ ScratchPad.record []
+ (-2.0...).step { |x| break if x > 1.5; ScratchPad << x }
+ ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
+ end
+
+ it "yields Float values incremented by an Integer step" do
+ (-5.0..).step(2) { |x| break if x > 3.5; ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
+
+ ScratchPad.record []
+ (-5.0...).step(2) { |x| break if x > 3.5; ScratchPad << x }
+ ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
+ end
+
+ it "yields Float values incremented by a Float step" do
+ (-1.0..).step(0.5) { |x| break if x > 0.6; ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
+
+ ScratchPad.record []
+ (-1.0...).step(0.5) { |x| break if x > 0.6; ScratchPad << x }
+ ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
+ end
+
+ it "handles infinite values at the start" do
+ (-Float::INFINITY..).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([-Float::INFINITY, -Float::INFINITY, -Float::INFINITY])
+
+ ScratchPad.record []
+ (-Float::INFINITY...).step(2) { |x| ScratchPad << x; break if ScratchPad.recorded.size == 3 }
+ ScratchPad.recorded.should eql([-Float::INFINITY, -Float::INFINITY, -Float::INFINITY])
+ end
+ end
+
+ describe "and String values" do
+ it "yields String values incremented by #succ and less than or equal to end when not passed a step" do
+ ('A'..).step { |x| break if x > "D"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "B", "C", "D"]
+
+ ScratchPad.record []
+ ('A'...).step { |x| break if x > "D"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "B", "C", "D"]
+ end
+
+ it "yields String values incremented by #succ called Integer step times" do
+ ('A'..).step(2) { |x| break if x > "F"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "C", "E"]
+
+ ScratchPad.record []
+ ('A'...).step(2) { |x| break if x > "F"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "C", "E"]
+ end
+
+ it "raises a TypeError when passed a Float step" do
+ -> { ('A'..).step(2.0) { } }.should raise_error(TypeError)
+ -> { ('A'...).step(2.0) { } }.should raise_error(TypeError)
+ end
+
+ ruby_version_is "3.4" do
+ it "yields String values adjusted by step" do
+ ('A'..).step("A") { |x| break if x > "AAA"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "AA", "AAA"]
+
+ ScratchPad.record []
+ ('A'...).step("A") { |x| break if x > "AAA"; ScratchPad << x }
+ ScratchPad.recorded.should == ["A", "AA", "AAA"]
+ end
+
+ it "raises a TypeError when passed an incompatible type step" do
+ -> { ('A'..).step([]) { } }.should raise_error(TypeError)
+ -> { ('A'...).step([]) { } }.should raise_error(TypeError)
+ end
+ end
+ end
+ end
+
+ describe "when no block is given" do
+ it "raises an ArgumentError if step is 0" do
+ -> { (-1..1).step(0) }.should raise_error(ArgumentError)
+ end
+
+ describe "returned Enumerator" do
+ describe "size" do
+ ruby_version_is ""..."3.4" do
+ it "raises a TypeError if step does not respond to #to_int" do
+ obj = mock("Range#step non-integer")
+ -> { (1..2).step(obj) }.should raise_error(TypeError)
+ end
+
+ it "raises a TypeError if #to_int does not return an Integer" do
+ obj = mock("Range#step non-integer")
+ obj.should_receive(:to_int).and_return("1")
+ -> { (1..2).step(obj) }.should raise_error(TypeError)
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "does not raise if step is incompatible" do
+ obj = mock("Range#step non-integer")
+ -> { (1..2).step(obj) }.should_not raise_error
+ end
+ end
+
+ it "returns the ceil of range size divided by the number of steps" do
+ (1..10).step(4).size.should == 3
+ (1..10).step(3).size.should == 4
+ (1..10).step(2).size.should == 5
+ (1..10).step(1).size.should == 10
+ (-5..5).step(2).size.should == 6
+ (1...10).step(4).size.should == 3
+ (1...10).step(3).size.should == 3
+ (1...10).step(2).size.should == 5
+ (1...10).step(1).size.should == 9
+ (-5...5).step(2).size.should == 5
+ end
+
+ it "returns the ceil of range size divided by the number of steps even if step is negative" do
+ (-1..1).step(-1).size.should == 0
+ (1..-1).step(-1).size.should == 3
+ end
+
+ it "returns the correct number of steps when one of the arguments is a float" do
+ (-1..1.0).step(0.5).size.should == 5
+ (-1.0...1.0).step(0.5).size.should == 4
+ end
+
+ it "returns the range size when there's no step_size" do
+ (-2..2).step.size.should == 5
+ (-2.0..2.0).step.size.should == 5
+ (-2..2.0).step.size.should == 5
+ (-2.0..2).step.size.should == 5
+ (1.0..6.4).step(1.8).size.should == 4
+ (1.0..12.7).step(1.3).size.should == 10
+ (-2...2).step.size.should == 4
+ (-2.0...2.0).step.size.should == 4
+ (-2...2.0).step.size.should == 4
+ (-2.0...2).step.size.should == 4
+ (1.0...6.4).step(1.8).size.should == 3
+ end
+
+ ruby_version_is ""..."3.4" do
+ it "returns nil with begin and end are String" do
+ ("A".."E").step(2).size.should == nil
+ ("A"..."E").step(2).size.should == nil
+ ("A".."E").step.size.should == nil
+ ("A"..."E").step.size.should == nil
+ end
+
+ it "return nil and not raises a TypeError if the first element does not respond to #succ" do
+ obj = mock("Range#step non-comparable")
+ obj.should_receive(:<=>).with(obj).and_return(1)
+ enum = (obj..obj).step
+ -> { enum.size }.should_not raise_error
+ enum.size.should == nil
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "returns nil with begin and end are String" do
+ ("A".."E").step("A").size.should == nil
+ ("A"..."E").step("A").size.should == nil
+ end
+
+ it "return nil and not raises a TypeError if the first element is not of compatible type" do
+ obj = mock("Range#step non-comparable")
+ obj.should_receive(:<=>).with(obj).and_return(1)
+ enum = (obj..obj).step(obj)
+ -> { enum.size }.should_not raise_error
+ enum.size.should == nil
+ end
+ end
+ end
+
+ # We use .take below to ensure the enumerator works
+ # because that's an Enumerable method and so it uses the Enumerator behavior
+ # not just a method overridden in Enumerator::ArithmeticSequence.
+ describe "type" do
+ context "when both begin and end are numerics" do
+ it "returns an instance of Enumerator::ArithmeticSequence" do
+ (1..10).step.class.should == Enumerator::ArithmeticSequence
+ (1..10).step(3).take(4).should == [1, 4, 7, 10]
+ end
+ end
+
+ context "when begin is not defined and end is numeric" do
+ it "returns an instance of Enumerator::ArithmeticSequence" do
+ (..10).step.class.should == Enumerator::ArithmeticSequence
+ end
+ end
+
+ context "when range is endless" do
+ it "returns an instance of Enumerator::ArithmeticSequence when begin is numeric" do
+ (1..).step.class.should == Enumerator::ArithmeticSequence
+ (1..).step(2).take(3).should == [1, 3, 5]
+ end
+
+ ruby_version_is ""..."3.4" do
+ it "returns an instance of Enumerator when begin is not numeric" do
+ ("a"..).step.class.should == Enumerator
+ ("a"..).step(2).take(3).should == %w[a c e]
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "returns an instance of Enumerator when begin is not numeric" do
+ ("a"..).step("a").class.should == Enumerator
+ ("a"..).step("a").take(3).should == %w[a aa aaa]
+ end
+ end
+ end
+
+ context "when range is beginless and endless" do
+ ruby_version_is ""..."3.4" do
+ it "returns an instance of Enumerator" do
+ Range.new(nil, nil).step.class.should == Enumerator
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "raises an ArgumentError" do
+ -> { Range.new(nil, nil).step(1) }.should raise_error(ArgumentError)
+ end
+ end
+ end
+
+ context "when begin and end are not numerics" do
+ ruby_version_is ""..."3.4" do
+ it "returns an instance of Enumerator" do
+ ("a".."z").step.class.should == Enumerator
+ ("a".."z").step(3).take(4).should == %w[a d g j]
+ end
+ end
+
+ ruby_version_is "3.4" do
+ it "returns an instance of Enumerator" do
+ ("a".."z").step("a").class.should == Enumerator
+ ("a".."z").step("a").take(4).should == %w[a aa aaa aaaa]
+ end
+ end
+ end
+ end
+ end
+ end
+end
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-23 09:06:47 +0000