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417 lines
15 KiB
Ruby
417 lines
15 KiB
Ruby
require_relative '../../../spec_helper'
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require_relative '../fixtures/classes'
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# Describes Numeric#step shared specs between different argument styles.
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# To be able to do it, the @step ivar must contain a Proc that transforms
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# the step call arguments passed as positional arguments to the style of
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# arguments pretended to test.
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describe :numeric_step, :shared => true do
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before :each do
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ScratchPad.record []
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@prc = -> x { ScratchPad << x }
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end
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it "defaults to step = 1" do
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@step.call(1, 5, &@prc)
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ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
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end
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it "defaults to an infinite limit with a step size of 1 for Integers" do
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1.step.first(5).should == [1, 2, 3, 4, 5]
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end
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it "defaults to an infinite limit with a step size of 1.0 for Floats" do
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1.0.step.first(5).should == [1.0, 2.0, 3.0, 4.0, 5.0]
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end
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describe "when self, stop and step are Fixnums" do
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it "yields only Fixnums" do
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@step.call(1, 5, 1) { |x| x.should be_an_instance_of(Fixnum) }
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end
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describe "with a positive step" do
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it "yields while increasing self by step until stop is reached" do
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@step.call(1, 5, 1, &@prc)
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ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
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end
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it "yields once when self equals stop" do
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@step.call(1, 1, 1, &@prc)
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ScratchPad.recorded.should eql [1]
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end
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it "does not yield when self is greater than stop" do
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@step.call(2, 1, 1, &@prc)
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ScratchPad.recorded.should eql []
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end
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end
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describe "with a negative step" do
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it "yields while decreasing self by step until stop is reached" do
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@step.call(5, 1, -1, &@prc)
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ScratchPad.recorded.should eql [5, 4, 3, 2, 1]
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end
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it "yields once when self equals stop" do
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@step.call(5, 5, -1, &@prc)
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ScratchPad.recorded.should eql [5]
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end
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it "does not yield when self is less than stop" do
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@step.call(1, 5, -1, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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end
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describe "when at least one of self, stop or step is a Float" do
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it "yields Floats even if only self is a Float" do
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@step.call(1.5, 5, 1) { |x| x.should be_an_instance_of(Float) }
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end
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it "yields Floats even if only stop is a Float" do
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@step.call(1, 5.0, 1) { |x| x.should be_an_instance_of(Float) }
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end
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it "yields Floats even if only step is a Float" do
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@step.call(1, 5, 1.0) { |x| x.should be_an_instance_of(Float) }
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end
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describe "with a positive step" do
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it "yields while increasing self by step while < stop" do
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@step.call(1.5, 5, 1, &@prc)
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ScratchPad.recorded.should eql [1.5, 2.5, 3.5, 4.5]
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end
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it "yields once when self equals stop" do
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@step.call(1.5, 1.5, 1, &@prc)
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ScratchPad.recorded.should eql [1.5]
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end
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it "does not yield when self is greater than stop" do
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@step.call(2.5, 1.5, 1, &@prc)
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ScratchPad.recorded.should == []
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end
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it "is careful about not yielding a value greater than limit" do
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# As 9*1.3+1.0 == 12.700000000000001 > 12.7, we test:
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@step.call(1.0, 12.7, 1.3, &@prc)
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ScratchPad.recorded.should eql [1.0, 2.3, 3.6, 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 "with a negative step" do
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it "yields while decreasing self by step while self > stop" do
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@step.call(5, 1.5, -1, &@prc)
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ScratchPad.recorded.should eql [5.0, 4.0, 3.0, 2.0]
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end
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it "yields once when self equals stop" do
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@step.call(1.5, 1.5, -1, &@prc)
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ScratchPad.recorded.should eql [1.5]
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end
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it "does not yield when self is less than stop" do
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@step.call(1, 5, -1.5, &@prc)
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ScratchPad.recorded.should == []
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end
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it "is careful about not yielding a value smaller than limit" do
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# As -9*1.3-1.0 == -12.700000000000001 < -12.7, we test:
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@step.call(-1.0, -12.7, -1.3, &@prc)
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ScratchPad.recorded.should eql [-1.0, -2.3, -3.6, -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 "with a positive Infinity step" do
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it "yields once if self < stop" do
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@step.call(42, 100, infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once when stop is Infinity" do
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@step.call(42, infinity_value, infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once when self equals stop" do
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@step.call(42, 42, infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once when self and stop are Infinity" do
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# @step.call(infinity_value, infinity_value, infinity_value, &@prc)
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@step.call(infinity_value, infinity_value, infinity_value, &@prc)
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ScratchPad.recorded.should == [infinity_value]
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end
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it "does not yield when self > stop" do
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@step.call(100, 42, infinity_value, &@prc)
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ScratchPad.recorded.should == []
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end
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it "does not yield when stop is -Infinity" do
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@step.call(42, -infinity_value, infinity_value, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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describe "with a negative Infinity step" do
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it "yields once if self > stop" do
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@step.call(42, 6, -infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once if stop is -Infinity" do
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@step.call(42, -infinity_value, -infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once when self equals stop" do
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@step.call(42, 42, -infinity_value, &@prc)
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ScratchPad.recorded.should eql [42.0]
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end
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it "yields once when self and stop are Infinity" do
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@step.call(infinity_value, infinity_value, -infinity_value, &@prc)
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ScratchPad.recorded.should == [infinity_value]
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end
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it "does not yield when self > stop" do
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@step.call(42, 100, -infinity_value, &@prc)
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ScratchPad.recorded.should == []
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end
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it "does not yield when stop is Infinity" do
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@step.call(42, infinity_value, -infinity_value, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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describe "with a Infinity stop and a positive step" do
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it "does not yield when self is infinity" do
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@step.call(infinity_value, infinity_value, 1, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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describe "with a Infinity stop and a negative step" do
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it "does not yield when self is negative infinity" do
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@step.call(-infinity_value, infinity_value, -1, &@prc)
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ScratchPad.recorded.should == []
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end
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it "does not yield when self is positive infinity" do
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@step.call(infinity_value, infinity_value, -1, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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describe "with a negative Infinity stop and a positive step" do
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it "does not yield when self is negative infinity" do
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@step.call(-infinity_value, -infinity_value, 1, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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describe "with a negative Infinity stop and a negative step" do
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it "does not yield when self is negative infinity" do
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@step.call(-infinity_value, -infinity_value, -1, &@prc)
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ScratchPad.recorded.should == []
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end
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end
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end
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describe "when step is a String" do
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describe "with self and stop as Fixnums" do
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it "raises an ArgumentError when step is a numeric representation" do
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-> { @step.call(1, 5, "1") {} }.should raise_error(ArgumentError)
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-> { @step.call(1, 5, "0.1") {} }.should raise_error(ArgumentError)
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-> { @step.call(1, 5, "1/3") {} }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError with step as an alphanumeric string" do
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-> { @step.call(1, 5, "foo") {} }.should raise_error(ArgumentError)
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end
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end
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describe "with self and stop as Floats" do
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it "raises an ArgumentError when step is a numeric representation" do
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-> { @step.call(1.1, 5.1, "1") {} }.should raise_error(ArgumentError)
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-> { @step.call(1.1, 5.1, "0.1") {} }.should raise_error(ArgumentError)
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-> { @step.call(1.1, 5.1, "1/3") {} }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError with step as an alphanumeric string" do
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-> { @step.call(1.1, 5.1, "foo") {} }.should raise_error(ArgumentError)
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end
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end
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end
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it "does not rescue ArgumentError exceptions" do
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-> { @step.call(1, 2) { raise ArgumentError, "" }}.should raise_error(ArgumentError)
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end
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it "does not rescue TypeError exceptions" do
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-> { @step.call(1, 2) { raise TypeError, "" } }.should raise_error(TypeError)
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end
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describe "when no block is given" do
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step_enum_class = Enumerator
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ruby_version_is "2.6" do
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step_enum_class = Enumerator::ArithmeticSequence
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end
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it "returns an #{step_enum_class} when step is 0" do
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@step.call(1, 2, 0).should be_an_instance_of(step_enum_class)
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end
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it "returns an #{step_enum_class} when not passed a block and self > stop" do
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@step.call(1, 0, 2).should be_an_instance_of(step_enum_class)
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end
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it "returns an #{step_enum_class} when not passed a block and self < stop" do
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@step.call(1, 2, 3).should be_an_instance_of(step_enum_class)
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end
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it "returns an #{step_enum_class} that uses the given step" do
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@step.call(0, 5, 2).to_a.should eql [0, 2, 4]
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end
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describe "when step is a String" do
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describe "with self and stop as Fixnums" do
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it "returns an Enumerator" do
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@step.call(1, 5, "foo").should be_an_instance_of(Enumerator)
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end
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end
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describe "with self and stop as Floats" do
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it "returns an Enumerator" do
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@step.call(1.1, 5.1, "foo").should be_an_instance_of(Enumerator)
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end
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end
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end
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describe "returned Enumerator" do
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describe "size" do
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describe "when step is a String" do
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describe "with self and stop as Fixnums" do
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it "raises an ArgumentError when step is a numeric representation" do
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-> { @step.call(1, 5, "1").size }.should raise_error(ArgumentError)
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-> { @step.call(1, 5, "0.1").size }.should raise_error(ArgumentError)
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-> { @step.call(1, 5, "1/3").size }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError with step as an alphanumeric string" do
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-> { @step.call(1, 5, "foo").size }.should raise_error(ArgumentError)
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end
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end
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describe "with self and stop as Floats" do
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it "raises an ArgumentError when step is a numeric representation" do
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-> { @step.call(1.1, 5.1, "1").size }.should raise_error(ArgumentError)
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-> { @step.call(1.1, 5.1, "0.1").size }.should raise_error(ArgumentError)
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-> { @step.call(1.1, 5.1, "1/3").size }.should raise_error(ArgumentError)
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end
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it "raises an ArgumentError with step as an alphanumeric string" do
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-> { @step.call(1.1, 5.1, "foo").size }.should raise_error(ArgumentError)
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end
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end
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end
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describe "when self, stop and step are Fixnums and step is positive" do
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it "returns the difference between self and stop divided by the number of steps" do
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@step.call(5, 10, 11).size.should == 1
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@step.call(5, 10, 6).size.should == 1
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@step.call(5, 10, 5).size.should == 2
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@step.call(5, 10, 4).size.should == 2
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@step.call(5, 10, 2).size.should == 3
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@step.call(5, 10, 1).size.should == 6
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@step.call(5, 10).size.should == 6
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@step.call(10, 10, 1).size.should == 1
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end
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it "returns 0 if value > limit" do
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@step.call(11, 10, 1).size.should == 0
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end
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end
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describe "when self, stop and step are Fixnums and step is negative" do
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it "returns the difference between self and stop divided by the number of steps" do
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@step.call(10, 5, -11).size.should == 1
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@step.call(10, 5, -6).size.should == 1
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@step.call(10, 5, -5).size.should == 2
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@step.call(10, 5, -4).size.should == 2
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@step.call(10, 5, -2).size.should == 3
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@step.call(10, 5, -1).size.should == 6
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@step.call(10, 10, -1).size.should == 1
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end
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it "returns 0 if value < limit" do
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@step.call(10, 11, -1).size.should == 0
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end
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end
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describe "when self, stop or step is a Float" do
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describe "and step is positive" do
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it "returns the difference between self and stop divided by the number of steps" do
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@step.call(5, 10, 11.0).size.should == 1
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@step.call(5, 10, 6.0).size.should == 1
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@step.call(5, 10, 5.0).size.should == 2
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@step.call(5, 10, 4.0).size.should == 2
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@step.call(5, 10, 2.0).size.should == 3
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@step.call(5, 10, 0.5).size.should == 11
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@step.call(5, 10, 1.0).size.should == 6
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@step.call(5, 10.5).size.should == 6
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@step.call(10, 10, 1.0).size.should == 1
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end
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it "returns 0 if value > limit" do
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@step.call(10, 5.5).size.should == 0
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@step.call(11, 10, 1.0).size.should == 0
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@step.call(11, 10, 1.5).size.should == 0
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@step.call(10, 5, infinity_value).size.should == 0
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end
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it "returns 1 if step is infinity_value" do
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@step.call(5, 10, infinity_value).size.should == 1
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end
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end
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describe "and step is negative" do
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it "returns the difference between self and stop divided by the number of steps" do
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@step.call(10, 5, -11.0).size.should == 1
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@step.call(10, 5, -6.0).size.should == 1
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@step.call(10, 5, -5.0).size.should == 2
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@step.call(10, 5, -4.0).size.should == 2
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@step.call(10, 5, -2.0).size.should == 3
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@step.call(10, 5, -0.5).size.should == 11
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@step.call(10, 5, -1.0).size.should == 6
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@step.call(10, 10, -1.0).size.should == 1
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end
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it "returns 0 if value < limit" do
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@step.call(10, 11, -1.0).size.should == 0
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@step.call(10, 11, -1.5).size.should == 0
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@step.call(5, 10, -infinity_value).size.should == 0
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end
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it "returns 1 if step is infinity_value" do
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@step.call(10, 5, -infinity_value).size.should == 1
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end
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end
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end
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describe "when stop is not passed" do
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it "returns infinity_value" do
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@step.call(1).size.should == infinity_value
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end
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end
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describe "when stop is nil" do
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it "returns infinity_value" do
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@step.call(1, nil, 5).size.should == infinity_value
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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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end
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