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|
require_relative '../../../spec_helper'
require_relative '../fixtures/classes'
# Describes Numeric#step shared specs between different argument styles.
# To be able to do it, the @step ivar 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 = -> x { ScratchPad << x }
end
it "defaults to step = 1" do
@step.call(1, 5, &@prc)
ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
end
it "defaults to an infinite limit with a step size of 1 for Integers" do
1.step.first(5).should == [1, 2, 3, 4, 5]
end
it "defaults to an infinite limit with a step size of 1.0 for Floats" do
1.0.step.first(5).should == [1.0, 2.0, 3.0, 4.0, 5.0]
end
describe "when self, stop and step are Fixnums" do
it "yields only Fixnums" do
@step.call(1, 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
@step.call(1, 5, 1, &@prc)
ScratchPad.recorded.should eql [1, 2, 3, 4, 5]
end
it "yields once when self equals stop" do
@step.call(1, 1, 1, &@prc)
ScratchPad.recorded.should eql [1]
end
it "does not yield when self is greater than stop" do
@step.call(2, 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
@step.call(5, 1, -1, &@prc)
ScratchPad.recorded.should eql [5, 4, 3, 2, 1]
end
it "yields once when self equals stop" do
@step.call(5, 5, -1, &@prc)
ScratchPad.recorded.should eql [5]
end
it "does not yield when self is less than stop" do
@step.call(1, 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
@step.call(1.5, 5, 1) { |x| x.should be_an_instance_of(Float) }
end
it "yields Floats even if only stop is a Float" do
@step.call(1, 5.0, 1) { |x| x.should be_an_instance_of(Float) }
end
it "yields Floats even if only step is a Float" do
@step.call(1, 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
@step.call(1.5, 5, 1, &@prc)
ScratchPad.recorded.should eql [1.5, 2.5, 3.5, 4.5]
end
it "yields once when self equals stop" do
@step.call(1.5, 1.5, 1, &@prc)
ScratchPad.recorded.should eql [1.5]
end
it "does not yield when self is greater than stop" do
@step.call(2.5, 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:
@step.call(1.0, 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
@step.call(5, 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
@step.call(1.5, 1.5, -1, &@prc)
ScratchPad.recorded.should eql [1.5]
end
it "does not yield when self is less than stop" do
@step.call(1, 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:
@step.call(-1.0, -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
@step.call(42, 100, infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once when stop is Infinity" do
@step.call(42, infinity_value, infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once when self equals stop" do
@step.call(42, 42, infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once when self and stop are Infinity" do
# @step.call(infinity_value, infinity_value, infinity_value, &@prc)
@step.call(infinity_value, infinity_value, infinity_value, &@prc)
ScratchPad.recorded.should == [infinity_value]
end
it "does not yield when self > stop" do
@step.call(100, 42, infinity_value, &@prc)
ScratchPad.recorded.should == []
end
it "does not yield when stop is -Infinity" do
@step.call(42, -infinity_value, infinity_value, &@prc)
ScratchPad.recorded.should == []
end
end
describe "with a negative Infinity step" do
it "yields once if self > stop" do
@step.call(42, 6, -infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once if stop is -Infinity" do
@step.call(42, -infinity_value, -infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once when self equals stop" do
@step.call(42, 42, -infinity_value, &@prc)
ScratchPad.recorded.should eql [42.0]
end
it "yields once when self and stop are Infinity" do
@step.call(infinity_value, infinity_value, -infinity_value, &@prc)
ScratchPad.recorded.should == [infinity_value]
end
it "does not yield when self > stop" do
@step.call(42, 100, -infinity_value, &@prc)
ScratchPad.recorded.should == []
end
it "does not yield when stop is Infinity" do
@step.call(42, 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
@step.call(infinity_value, 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
@step.call(-infinity_value, infinity_value, -1, &@prc)
ScratchPad.recorded.should == []
end
it "does not yield when self is positive infinity" do
@step.call(infinity_value, 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
@step.call(-infinity_value, -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
@step.call(-infinity_value, -infinity_value, -1, &@prc)
ScratchPad.recorded.should == []
end
end
end
describe "when step is a String" do
error = nil
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
-> { @step.call(1, 5, "1") {} }.should raise_error(error)
-> { @step.call(1, 5, "0.1") {} }.should raise_error(error)
-> { @step.call(1, 5, "1/3") {} }.should raise_error(error)
end
it "raises an #{error} with step as an alphanumeric string" do
-> { @step.call(1, 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
-> { @step.call(1.1, 5.1, "1") {} }.should raise_error(error)
-> { @step.call(1.1, 5.1, "0.1") {} }.should raise_error(error)
-> { @step.call(1.1, 5.1, "1/3") {} }.should raise_error(error)
end
it "raises an #{error} with step as an alphanumeric string" do
-> { @step.call(1.1, 5.1, "foo") {} }.should raise_error(error)
end
end
end
it "does not rescue ArgumentError exceptions" do
-> { @step.call(1, 2) { raise ArgumentError, "" }}.should raise_error(ArgumentError)
end
it "does not rescue TypeError exceptions" do
-> { @step.call(1, 2) { raise TypeError, "" } }.should raise_error(TypeError)
end
describe "when no block is given" do
step_enum_class = Enumerator
ruby_version_is "2.6" do
step_enum_class = Enumerator::ArithmeticSequence
end
it "returns an #{step_enum_class} when step is 0" do
@step.call(1, 2, 0).should be_an_instance_of(step_enum_class)
end
it "returns an #{step_enum_class} when not passed a block and self > stop" do
@step.call(1, 0, 2).should be_an_instance_of(step_enum_class)
end
it "returns an #{step_enum_class} when not passed a block and self < stop" do
@step.call(1, 2, 3).should be_an_instance_of(step_enum_class)
end
it "returns an #{step_enum_class} that uses the given step" do
@step.call(0, 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
@step.call(1, 5, "foo").should be_an_instance_of(Enumerator)
end
end
describe "with self and stop as Floats" do
it "returns an Enumerator" do
@step.call(1.1, 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"..."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
-> { @step.call(1, 5, "1").size }.should raise_error(error)
-> { @step.call(1, 5, "0.1").size }.should raise_error(error)
-> { @step.call(1, 5, "1/3").size }.should raise_error(error)
end
it "raises an #{error} with step as an alphanumeric string" do
-> { @step.call(1, 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
-> { @step.call(1.1, 5.1, "1").size }.should raise_error(error)
-> { @step.call(1.1, 5.1, "0.1").size }.should raise_error(error)
-> { @step.call(1.1, 5.1, "1/3").size }.should raise_error(error)
end
it "raises an #{error} with step as an alphanumeric string" do
-> { @step.call(1.1, 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
@step.call(5, 10, 11).size.should == 1
@step.call(5, 10, 6).size.should == 1
@step.call(5, 10, 5).size.should == 2
@step.call(5, 10, 4).size.should == 2
@step.call(5, 10, 2).size.should == 3
@step.call(5, 10, 1).size.should == 6
@step.call(5, 10).size.should == 6
@step.call(10, 10, 1).size.should == 1
end
it "returns 0 if value > limit" do
@step.call(11, 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
@step.call(10, 5, -11).size.should == 1
@step.call(10, 5, -6).size.should == 1
@step.call(10, 5, -5).size.should == 2
@step.call(10, 5, -4).size.should == 2
@step.call(10, 5, -2).size.should == 3
@step.call(10, 5, -1).size.should == 6
@step.call(10, 10, -1).size.should == 1
end
it "returns 0 if value < limit" do
@step.call(10, 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
@step.call(5, 10, 11.0).size.should == 1
@step.call(5, 10, 6.0).size.should == 1
@step.call(5, 10, 5.0).size.should == 2
@step.call(5, 10, 4.0).size.should == 2
@step.call(5, 10, 2.0).size.should == 3
@step.call(5, 10, 0.5).size.should == 11
@step.call(5, 10, 1.0).size.should == 6
@step.call(5, 10.5).size.should == 6
@step.call(10, 10, 1.0).size.should == 1
end
it "returns 0 if value > limit" do
@step.call(10, 5.5).size.should == 0
@step.call(11, 10, 1.0).size.should == 0
@step.call(11, 10, 1.5).size.should == 0
@step.call(10, 5, infinity_value).size.should == 0
end
it "returns 1 if step is infinity_value" do
@step.call(5, 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
@step.call(10, 5, -11.0).size.should == 1
@step.call(10, 5, -6.0).size.should == 1
@step.call(10, 5, -5.0).size.should == 2
@step.call(10, 5, -4.0).size.should == 2
@step.call(10, 5, -2.0).size.should == 3
@step.call(10, 5, -0.5).size.should == 11
@step.call(10, 5, -1.0).size.should == 6
@step.call(10, 10, -1.0).size.should == 1
end
it "returns 0 if value < limit" do
@step.call(10, 11, -1.0).size.should == 0
@step.call(10, 11, -1.5).size.should == 0
@step.call(5, 10, -infinity_value).size.should == 0
end
it "returns 1 if step is infinity_value" do
@step.call(10, 5, -infinity_value).size.should == 1
end
end
end
describe "when stop is not passed" do
it "returns infinity_value" do
@step.call(1).size.should == infinity_value
end
end
describe "when stop is nil" do
it "returns infinity_value" do
@step.call(1, nil, 5).size.should == infinity_value
end
end
end
end
end
end
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