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* Other ruby implementations use the spec/ruby directory. [Misc #13792] [ruby-core:82287] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
347 lines
12 KiB
Ruby
347 lines
12 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe "Range#step" do
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before :each do
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ScratchPad.record []
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end
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it "returns an enumerator when no block is given" do
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enum = (1..10).step(4)
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enum.should be_an_instance_of(Enumerator)
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enum.to_a.should eql([1, 5, 9])
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end
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it "returns self" do
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r = 1..2
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r.step { }.should equal(r)
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end
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it "raises TypeError if step" do
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obj = mock("mock")
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lambda { (1..10).step(obj) { } }.should raise_error(TypeError)
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end
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it "calls #to_int to coerce step to an Integer" do
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obj = mock("Range#step")
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obj.should_receive(:to_int).and_return(1)
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(1..2).step(obj) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([1, 2])
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end
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it "raises a TypeError if step does not respond to #to_int" do
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obj = mock("Range#step non-integer")
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lambda { (1..2).step(obj) { } }.should raise_error(TypeError)
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end
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it "raises a TypeError if #to_int does not return an Integer" do
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obj = mock("Range#step non-integer")
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obj.should_receive(:to_int).and_return("1")
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lambda { (1..2).step(obj) { } }.should raise_error(TypeError)
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end
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it "coerces the argument to integer by invoking to_int" do
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(obj = mock("2")).should_receive(:to_int).and_return(2)
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res = []
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(1..10).step(obj) {|x| res << x}
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res.should == [1, 3, 5, 7, 9]
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end
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it "raises a TypeError if the first element does not respond to #succ" do
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obj = mock("Range#step non-comparable")
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obj.should_receive(:<=>).with(obj).and_return(1)
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lambda { (obj..obj).step { |x| x } }.should raise_error(TypeError)
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end
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it "raises an ArgumentError if step is 0" do
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lambda { (-1..1).step(0) { |x| x } }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if step is 0.0" do
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lambda { (-1..1).step(0.0) { |x| x } }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if step is negative" do
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lambda { (-1..1).step(-2) { |x| x } }.should raise_error(ArgumentError)
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end
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describe "with inclusive end" do
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describe "and Integer values" do
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it "yields Integer values incremented by 1 and less than or equal to end when not passed a step" do
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(-2..2).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2, -1, 0, 1, 2])
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end
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it "yields Integer values incremented by an Integer step" do
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(-5..5).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5, -3, -1, 1, 3, 5])
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end
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it "yields Float values incremented by a Float step" do
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(-2..2).step(1.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
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end
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end
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describe "and Float values" do
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it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
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(-2.0..2.0).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5.0..5.0).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
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end
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it "yields Float values incremented by a Float step" do
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(-1.0..1.0).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
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end
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it "returns Float values of 'step * n + begin <= end'" do
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(1.0..6.4).step(1.8) { |x| ScratchPad << x }
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(1.0..12.7).step(1.3) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([1.0, 2.8, 4.6, 6.4, 1.0, 2.3, 3.6,
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4.9, 6.2, 7.5, 8.8, 10.1, 11.4, 12.7])
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end
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end
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describe "and Integer, Float values" do
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it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
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(-2..2.0).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5..5.0).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
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end
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it "yields Float values incremented by a Float step" do
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(-1..1.0).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
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end
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end
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describe "and Float, Integer values" do
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it "yields Float values incremented by 1 and less than or equal to end when not passed a step" do
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(-2.0..2).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0, 2.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5.0..5).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0, 5.0])
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end
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it "yields Float values incremented by a Float step" do
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(-1.0..1).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5, 1.0])
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end
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end
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describe "and String values" do
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it "yields String values incremented by #succ and less than or equal to end when not passed a step" do
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("A".."E").step { |x| ScratchPad << x }
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ScratchPad.recorded.should == ["A", "B", "C", "D", "E"]
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end
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it "yields String values incremented by #succ called Integer step times" do
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("A".."G").step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should == ["A", "C", "E", "G"]
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end
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it "raises a TypeError when passed a Float step" do
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lambda { ("A".."G").step(2.0) { } }.should raise_error(TypeError)
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end
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it "calls #succ on begin and each element returned by #succ" do
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obj = mock("Range#step String start")
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obj.should_receive(:<=>).exactly(3).times.and_return(-1, -1, -1, 0)
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obj.should_receive(:succ).exactly(2).times.and_return(obj)
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(obj..obj).step { |x| ScratchPad << x }
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ScratchPad.recorded.should == [obj, obj, obj]
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end
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end
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end
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describe "with exclusive end" do
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describe "and Integer values" do
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it "yields Integer values incremented by 1 and less than end when not passed a step" do
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(-2...2).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2, -1, 0, 1])
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end
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it "yields Integer values incremented by an Integer step" do
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(-5...5).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5, -3, -1, 1, 3])
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end
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it "yields Float values incremented by a Float step" do
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(-2...2).step(1.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -0.5, 1.0])
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end
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end
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describe "and Float values" do
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it "yields Float values incremented by 1 and less than end when not passed a step" do
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(-2.0...2.0).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5.0...5.0).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
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end
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it "yields Float values incremented by a Float step" do
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(-1.0...1.0).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
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end
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it "returns Float values of 'step * n + begin < end'" do
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(1.0...6.4).step(1.8) { |x| ScratchPad << x }
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(1.0...55.6).step(18.2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([1.0, 2.8, 4.6, 1.0, 19.2, 37.4])
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end
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end
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describe "and Integer, Float values" do
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it "yields Float values incremented by 1 and less than end when not passed a step" do
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(-2...2.0).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5...5.0).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
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end
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it "yields an Float and then Float values incremented by a Float step" do
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(-1...1.0).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
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end
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end
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describe "and Float, Integer values" do
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it "yields Float values incremented by 1 and less than end when not passed a step" do
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(-2.0...2).step { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-2.0, -1.0, 0.0, 1.0])
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end
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it "yields Float values incremented by an Integer step" do
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(-5.0...5).step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-5.0, -3.0, -1.0, 1.0, 3.0])
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end
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it "yields Float values incremented by a Float step" do
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(-1.0...1).step(0.5) { |x| ScratchPad << x }
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ScratchPad.recorded.should eql([-1.0, -0.5, 0.0, 0.5])
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end
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end
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describe "and String values" do
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it "yields String values incremented by #succ and less than or equal to end when not passed a step" do
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("A"..."E").step { |x| ScratchPad << x }
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ScratchPad.recorded.should == ["A", "B", "C", "D"]
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end
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it "yields String values incremented by #succ called Integer step times" do
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("A"..."G").step(2) { |x| ScratchPad << x }
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ScratchPad.recorded.should == ["A", "C", "E"]
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end
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it "raises a TypeError when passed a Float step" do
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lambda { ("A"..."G").step(2.0) { } }.should raise_error(TypeError)
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end
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end
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end
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describe "when no block is given" do
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describe "returned Enumerator" do
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describe "size" do
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it "raises a TypeError if step does not respond to #to_int" do
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obj = mock("Range#step non-integer")
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enum = (1..2).step(obj)
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lambda { enum.size }.should raise_error(TypeError)
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end
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it "raises a TypeError if #to_int does not return an Integer" do
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obj = mock("Range#step non-integer")
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obj.should_receive(:to_int).and_return("1")
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enum = (1..2).step(obj)
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lambda { enum.size }.should raise_error(TypeError)
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end
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it "raises an ArgumentError if step is 0" do
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enum = (-1..1).step(0)
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lambda { enum.size }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if step is 0.0" do
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enum = (-1..1).step(0.0)
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lambda { enum.size }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError if step is negative" do
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enum = (-1..1).step(-2)
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lambda { enum.size }.should raise_error(ArgumentError)
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end
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it "returns the ceil of range size divided by the number of steps" do
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(1..10).step(4).size.should == 3
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(1..10).step(3).size.should == 4
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(1..10).step(2).size.should == 5
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(1..10).step(1).size.should == 10
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(-5..5).step(2).size.should == 6
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(1...10).step(4).size.should == 3
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(1...10).step(3).size.should == 3
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(1...10).step(2).size.should == 5
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(1...10).step(1).size.should == 9
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(-5...5).step(2).size.should == 5
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end
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it "returns the correct number of steps when one of the arguments is a float" do
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(-1..1.0).step(0.5).size.should == 5
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(-1.0...1.0).step(0.5).size.should == 4
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end
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it "returns the range size when there's no step_size" do
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(-2..2).step.size.should == 5
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(-2.0..2.0).step.size.should == 5
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(-2..2.0).step.size.should == 5
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(-2.0..2).step.size.should == 5
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(1.0..6.4).step(1.8).size.should == 4
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(1.0..12.7).step(1.3).size.should == 10
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(-2...2).step.size.should == 4
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(-2.0...2.0).step.size.should == 4
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(-2...2.0).step.size.should == 4
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(-2.0...2).step.size.should == 4
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(1.0...6.4).step(1.8).size.should == 3
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(1.0...55.6).step(18.2).size.should == 3
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end
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it "returns nil with begin and end are String" do
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("A".."E").step(2).size.should == nil
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("A"..."E").step(2).size.should == nil
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("A".."E").step.size.should == nil
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("A"..."E").step.size.should == nil
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end
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it "return nil and not raises a TypeError if the first element does not respond to #succ" do
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obj = mock("Range#step non-comparable")
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obj.should_receive(:<=>).with(obj).and_return(1)
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enum = (obj..obj).step
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lambda { enum.size }.should_not raise_error
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enum.size.should == nil
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end
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end
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end
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end
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end
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