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-rw-r--r--spec/ruby/core/numeric/shared/step.rb425
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+require File.expand_path('../../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+# Describes Numeric#step shared specs between different argument styles.
+# To be able to do it, the @step_args var must contain a Proc that transforms
+# the step call arguments passed as positional arguments to the style of
+# arguments pretended to test.
+describe :numeric_step, :shared => true do
+ before :each do
+ ScratchPad.record []
+ @prc = lambda { |x| ScratchPad << x }
+ end
+
+ it "defaults to step = 1" do
+ 1.send(@method, *@step_args.call(5), &@prc)
+ ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
+ end
+
+ describe "when self, stop and step are Fixnums" do
+ it "yields only Fixnums" do
+ 1.send(@method, *@step_args.call(5, 1)) { |x| x.should be_an_instance_of(Fixnum) }
+ end
+
+ describe "with a positive step" do
+ it "yields while increasing self by step until stop is reached" do
+ 1.send(@method, *@step_args.call(5, 1), &@prc)
+ ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
+ end
+
+ it "yields once when self equals stop" do
+ 1.send(@method, *@step_args.call(1, 1), &@prc)
+ ScratchPad.recorded.should eql [1]
+ end
+
+ it "does not yield when self is greater than stop" do
+ 2.send(@method, *@step_args.call(1, 1), &@prc)
+ ScratchPad.recorded.should eql []
+ end
+ end
+
+ describe "with a negative step" do
+ it "yields while decreasing self by step until stop is reached" do
+ 5.send(@method, *@step_args.call(1, -1), &@prc)
+ ScratchPad.recorded.should eql [5, 4, 3, 2, 1]
+ end
+
+ it "yields once when self equals stop" do
+ 5.send(@method, *@step_args.call(5, -1), &@prc)
+ ScratchPad.recorded.should eql [5]
+ end
+
+ it "does not yield when self is less than stop" do
+ 1.send(@method, *@step_args.call(5, -1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+ end
+
+ describe "when at least one of self, stop or step is a Float" do
+ it "yields Floats even if only self is a Float" do
+ 1.5.send(@method, *@step_args.call(5, 1)) { |x| x.should be_an_instance_of(Float) }
+ end
+
+ it "yields Floats even if only stop is a Float" do
+ 1.send(@method, *@step_args.call(5.0, 1)) { |x| x.should be_an_instance_of(Float) }
+ end
+
+ it "yields Floats even if only step is a Float" do
+ 1.send(@method, *@step_args.call(5, 1.0)) { |x| x.should be_an_instance_of(Float) }
+ end
+
+ describe "with a positive step" do
+ it "yields while increasing self by step while < stop" do
+ 1.5.send(@method, *@step_args.call(5, 1), &@prc)
+ ScratchPad.recorded.should eql [1.5, 2.5, 3.5, 4.5]
+ end
+
+ it "yields once when self equals stop" do
+ 1.5.send(@method, *@step_args.call(1.5, 1), &@prc)
+ ScratchPad.recorded.should eql [1.5]
+ end
+
+ it "does not yield when self is greater than stop" do
+ 2.5.send(@method, *@step_args.call(1.5, 1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+
+ it "is careful about not yielding a value greater than limit" do
+ # As 9*1.3+1.0 == 12.700000000000001 > 12.7, we test:
+ 1.0.send(@method, *@step_args.call(12.7, 1.3), &@prc)
+ ScratchPad.recorded.should eql [1.0, 2.3, 3.6, 4.9, 6.2, 7.5, 8.8, 10.1, 11.4, 12.7]
+ end
+ end
+
+ describe "with a negative step" do
+ it "yields while decreasing self by step while self > stop" do
+ 5.send(@method, *@step_args.call(1.5, -1), &@prc)
+ ScratchPad.recorded.should eql [5.0, 4.0, 3.0, 2.0]
+ end
+
+ it "yields once when self equals stop" do
+ 1.5.send(@method, *@step_args.call(1.5, -1), &@prc)
+ ScratchPad.recorded.should eql [1.5]
+ end
+
+ it "does not yield when self is less than stop" do
+ 1.send(@method, *@step_args.call(5, -1.5), &@prc)
+ ScratchPad.recorded.should == []
+ end
+
+ it "is careful about not yielding a value smaller than limit" do
+ # As -9*1.3-1.0 == -12.700000000000001 < -12.7, we test:
+ -1.0.send(@method, *@step_args.call(-12.7, -1.3), &@prc)
+ ScratchPad.recorded.should eql [-1.0, -2.3, -3.6, -4.9, -6.2, -7.5, -8.8, -10.1, -11.4, -12.7]
+ end
+ end
+
+ describe "with a positive Infinity step" do
+ it "yields once if self < stop" do
+ 42.send(@method, *@step_args.call(100, infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once when stop is Infinity" do
+ 42.send(@method, *@step_args.call(infinity_value, infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once when self equals stop" do
+ 42.send(@method, *@step_args.call(42, infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once when self and stop are Infinity" do
+ (infinity_value).send(@method, *@step_args.call(infinity_value, infinity_value), &@prc)
+ ScratchPad.recorded.should == [infinity_value]
+ end
+
+ it "does not yield when self > stop" do
+ 100.send(@method, *@step_args.call(42, infinity_value), &@prc)
+ ScratchPad.recorded.should == []
+ end
+
+ it "does not yield when stop is -Infinity" do
+ 42.send(@method, *@step_args.call(-infinity_value, infinity_value), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ describe "with a negative Infinity step" do
+ it "yields once if self > stop" do
+ 42.send(@method, *@step_args.call(6, -infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once if stop is -Infinity" do
+ 42.send(@method, *@step_args.call(-infinity_value, -infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once when self equals stop" do
+ 42.send(@method, *@step_args.call(42, -infinity_value), &@prc)
+ ScratchPad.recorded.should eql [42.0]
+ end
+
+ it "yields once when self and stop are Infinity" do
+ (infinity_value).send(@method, *@step_args.call(infinity_value, -infinity_value), &@prc)
+ ScratchPad.recorded.should == [infinity_value]
+ end
+
+ it "does not yield when self > stop" do
+ 42.send(@method, *@step_args.call(100, -infinity_value), &@prc)
+ ScratchPad.recorded.should == []
+ end
+
+ it "does not yield when stop is Infinity" do
+ 42.send(@method, *@step_args.call(infinity_value, -infinity_value), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ describe "with a Infinity stop and a positive step" do
+ it "does not yield when self is infinity" do
+ (infinity_value).send(@method, *@step_args.call(infinity_value, 1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ describe "with a Infinity stop and a negative step" do
+ it "does not yield when self is negative infinity" do
+ (-infinity_value).send(@method, *@step_args.call(infinity_value, -1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+
+ it "does not yield when self is positive infinity" do
+ infinity_value.send(@method, *@step_args.call(infinity_value, -1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ describe "with a negative Infinity stop and a positive step" do
+ it "does not yield when self is negative infinity" do
+ (-infinity_value).send(@method, *@step_args.call(-infinity_value, 1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ describe "with a negative Infinity stop and a negative step" do
+ it "does not yield when self is negative infinity" do
+ (-infinity_value).send(@method, *@step_args.call(-infinity_value, -1), &@prc)
+ ScratchPad.recorded.should == []
+ end
+ end
+
+ end
+
+ describe "when step is a String" do
+ error = nil
+ ruby_version_is ""..."2.4" do
+ error = ArgumentError
+ end
+ ruby_version_is "2.4"..."2.5" do
+ error = TypeError
+ end
+ ruby_version_is "2.5" do
+ error = ArgumentError
+ end
+
+ describe "with self and stop as Fixnums" do
+ it "raises an #{error} when step is a numeric representation" do
+ lambda { 1.send(@method, *@step_args.call(5, "1")) {} }.should raise_error(error)
+ lambda { 1.send(@method, *@step_args.call(5, "0.1")) {} }.should raise_error(error)
+ lambda { 1.send(@method, *@step_args.call(5, "1/3")) {} }.should raise_error(error)
+ end
+ it "raises an #{error} with step as an alphanumeric string" do
+ lambda { 1.send(@method, *@step_args.call(5, "foo")) {} }.should raise_error(error)
+ end
+ end
+
+ describe "with self and stop as Floats" do
+ it "raises an #{error} when step is a numeric representation" do
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "1")) {} }.should raise_error(error)
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "0.1")) {} }.should raise_error(error)
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "1/3")) {} }.should raise_error(error)
+ end
+ it "raises an #{error} with step as an alphanumeric string" do
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "foo")) {} }.should raise_error(error)
+ end
+ end
+ end
+
+ it "does not rescue ArgumentError exceptions" do
+ lambda { 1.send(@method, *@step_args.call(2)) { raise ArgumentError, "" }}.should raise_error(ArgumentError)
+ end
+
+ it "does not rescue TypeError exceptions" do
+ lambda { 1.send(@method, *@step_args.call(2)) { raise TypeError, "" } }.should raise_error(TypeError)
+ end
+
+ describe "when no block is given" do
+ it "returns an Enumerator when step is 0" do
+ 1.send(@method, *@step_args.call(2, 0)).should be_an_instance_of(Enumerator)
+ end
+
+ it "returns an Enumerator when not passed a block and self > stop" do
+ 1.send(@method, *@step_args.call(0, 2)).should be_an_instance_of(Enumerator)
+ end
+
+ it "returns an Enumerator when not passed a block and self < stop" do
+ 1.send(@method, *@step_args.call(2, 3)).should be_an_instance_of(Enumerator)
+ end
+
+ it "returns an Enumerator that uses the given step" do
+ 0.send(@method, *@step_args.call(5, 2)).to_a.should eql [0, 2, 4]
+ end
+
+ describe "when step is a String" do
+ describe "with self and stop as Fixnums" do
+ it "returns an Enumerator" do
+ 1.send(@method, *@step_args.call(5, "foo")).should be_an_instance_of(Enumerator)
+ end
+ end
+
+ describe "with self and stop as Floats" do
+ it "returns an Enumerator" do
+ 1.1.send(@method, *@step_args.call(5.1, "foo")).should be_an_instance_of(Enumerator)
+ end
+ end
+ end
+
+ describe "returned Enumerator" do
+ describe "size" do
+ describe "when step is a String" do
+ error = nil
+ ruby_version_is ""..."2.4" do
+ error = ArgumentError
+ end
+ ruby_version_is "2.4"..."2.5" do
+ error = TypeError
+ end
+ ruby_version_is "2.5" do
+ error = ArgumentError
+ end
+
+ describe "with self and stop as Fixnums" do
+ it "raises an #{error} when step is a numeric representation" do
+ lambda { 1.send(@method, *@step_args.call(5, "1")).size }.should raise_error(error)
+ lambda { 1.send(@method, *@step_args.call(5, "0.1")).size }.should raise_error(error)
+ lambda { 1.send(@method, *@step_args.call(5, "1/3")).size }.should raise_error(error)
+ end
+ it "raises an #{error} with step as an alphanumeric string" do
+ lambda { 1.send(@method, *@step_args.call(5, "foo")).size }.should raise_error(error)
+ end
+ end
+
+ describe "with self and stop as Floats" do
+ it "raises an #{error} when step is a numeric representation" do
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "1")).size }.should raise_error(error)
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "0.1")).size }.should raise_error(error)
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "1/3")).size }.should raise_error(error)
+ end
+ it "raises an #{error} with step as an alphanumeric string" do
+ lambda { 1.1.send(@method, *@step_args.call(5.1, "foo")).size }.should raise_error(error)
+ end
+ end
+ end
+
+ describe "when self, stop and step are Fixnums and step is positive" do
+ it "returns the difference between self and stop divided by the number of steps" do
+ 5.send(@method, *@step_args.call(10, 11)).size.should == 1
+ 5.send(@method, *@step_args.call(10, 6)).size.should == 1
+ 5.send(@method, *@step_args.call(10, 5)).size.should == 2
+ 5.send(@method, *@step_args.call(10, 4)).size.should == 2
+ 5.send(@method, *@step_args.call(10, 2)).size.should == 3
+ 5.send(@method, *@step_args.call(10, 1)).size.should == 6
+ 5.send(@method, *@step_args.call(10)).size.should == 6
+ 10.send(@method, *@step_args.call(10, 1)).size.should == 1
+ end
+
+ it "returns 0 if value > limit" do
+ 11.send(@method, *@step_args.call(10, 1)).size.should == 0
+ end
+ end
+
+ describe "when self, stop and step are Fixnums and step is negative" do
+ it "returns the difference between self and stop divided by the number of steps" do
+ 10.send(@method, *@step_args.call(5, -11)).size.should == 1
+ 10.send(@method, *@step_args.call(5, -6)).size.should == 1
+ 10.send(@method, *@step_args.call(5, -5)).size.should == 2
+ 10.send(@method, *@step_args.call(5, -4)).size.should == 2
+ 10.send(@method, *@step_args.call(5, -2)).size.should == 3
+ 10.send(@method, *@step_args.call(5, -1)).size.should == 6
+ 10.send(@method, *@step_args.call(10, -1)).size.should == 1
+ end
+
+ it "returns 0 if value < limit" do
+ 10.send(@method, *@step_args.call(11, -1)).size.should == 0
+ end
+ end
+
+ describe "when self, stop or step is a Float" do
+ describe "and step is positive" do
+ it "returns the difference between self and stop divided by the number of steps" do
+ 5.send(@method, *@step_args.call(10, 11.0)).size.should == 1
+ 5.send(@method, *@step_args.call(10, 6.0)).size.should == 1
+ 5.send(@method, *@step_args.call(10, 5.0)).size.should == 2
+ 5.send(@method, *@step_args.call(10, 4.0)).size.should == 2
+ 5.send(@method, *@step_args.call(10, 2.0)).size.should == 3
+ 5.send(@method, *@step_args.call(10, 0.5)).size.should == 11
+ 5.send(@method, *@step_args.call(10, 1.0)).size.should == 6
+ 5.send(@method, *@step_args.call(10.5)).size.should == 6
+ 10.send(@method, *@step_args.call(10, 1.0)).size.should == 1
+ end
+
+ it "returns 0 if value > limit" do
+ 10.send(@method, *@step_args.call(5.5)).size.should == 0
+ 11.send(@method, *@step_args.call(10, 1.0)).size.should == 0
+ 11.send(@method, *@step_args.call(10, 1.5)).size.should == 0
+ 10.send(@method, *@step_args.call(5, infinity_value)).size.should == 0
+ end
+
+ it "returns 1 if step is infinity_value" do
+ 5.send(@method, *@step_args.call(10, infinity_value)).size.should == 1
+ end
+ end
+
+ describe "and step is negative" do
+ it "returns the difference between self and stop divided by the number of steps" do
+ 10.send(@method, *@step_args.call(5, -11.0)).size.should == 1
+ 10.send(@method, *@step_args.call(5, -6.0)).size.should == 1
+ 10.send(@method, *@step_args.call(5, -5.0)).size.should == 2
+ 10.send(@method, *@step_args.call(5, -4.0)).size.should == 2
+ 10.send(@method, *@step_args.call(5, -2.0)).size.should == 3
+ 10.send(@method, *@step_args.call(5, -0.5)).size.should == 11
+ 10.send(@method, *@step_args.call(5, -1.0)).size.should == 6
+ 10.send(@method, *@step_args.call(10, -1.0)).size.should == 1
+ end
+
+ it "returns 0 if value < limit" do
+ 10.send(@method, *@step_args.call(11, -1.0)).size.should == 0
+ 10.send(@method, *@step_args.call(11, -1.5)).size.should == 0
+ 5.send(@method, *@step_args.call(10, -infinity_value)).size.should == 0
+ end
+
+ it "returns 1 if step is infinity_value" do
+ 10.send(@method, *@step_args.call(5, -infinity_value)).size.should == 1
+ end
+ end
+ end
+
+ describe "when stop is not passed" do
+ it "returns infinity_value" do
+ 1.send(@method, *@step_args.call()).size.should == infinity_value
+ end
+ end
+
+ describe "when stop is nil" do
+ it "returns infinity_value" do
+ 1.send(@method, *@step_args.call(nil, 5)).size.should == infinity_value
+ end
+ end
+ end
+ end
+ end
+end
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