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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/step', __FILE__)
describe "Numeric#step" do
describe 'with positional args' do
it "raises an ArgumentError when step is 0" do
lambda { 1.step(5, 0) {} }.should raise_error(ArgumentError)
end
it "raises an ArgumentError when step is 0.0" do
lambda { 1.step(2, 0.0) {} }.should raise_error(ArgumentError)
end
before :all do
# This lambda definition limits to return the arguments it receives.
# It's needed to test numeric_step behaviour with positional arguments.
@step_args = ->(*args) { args }
end
it_behaves_like :numeric_step, :step
describe "when no block is given" do
it "returns an Enumerator when step is 0" do
1.step(5, 0).should be_an_instance_of(Enumerator)
end
it "returns an Enumerator when step is 0.0" do
1.step(2, 0.0).should be_an_instance_of(Enumerator)
end
describe "returned Enumerator" do
describe "size" do
it "raises an ArgumentError when step is 0" do
enum = 1.step(5, 0)
lambda { enum.size }.should raise_error(ArgumentError)
end
it "raises an ArgumentError when step is 0.0" do
enum = 1.step(2, 0.0)
lambda { enum.size }.should raise_error(ArgumentError)
end
end
end
end
end
describe 'with keyword arguments' do
it "doesn't raise an error when step is 0" do
lambda { 1.step(to: 5, by: 0) { break } }.should_not raise_error
end
it "doesn't raise an error when step is 0.0" do
lambda { 1.step(to: 2, by: 0.0) { break } }.should_not raise_error
end
it "should loop over self when step is 0 or 0.0" do
1.step(to: 2, by: 0.0).take(5).should eql [1.0, 1.0, 1.0, 1.0, 1.0]
1.step(to: 2, by: 0).take(5).should eql [1, 1, 1, 1, 1]
1.1.step(to: 2, by: 0).take(5).should eql [1.1, 1.1, 1.1, 1.1, 1.1]
end
describe "when no block is given" do
describe "returned Enumerator" do
describe "size" do
it "should return infinity_value when step is 0" do
1.step(to: 5, by: 0).size.should == infinity_value
end
it "should return infinity_value when step is 0.0" do
1.step(to: 2, by: 0.0).size.should == infinity_value
end
it "should return infinity_value when the limit is Float::INFINITY" do
1.step(to: Float::INFINITY, by: 42).size.should == infinity_value
end
it "should return 1 when the both limit and step are Float::INFINITY" do
1.step(to: Float::INFINITY, by: Float::INFINITY).size.should == 1
end
end
end
end
before :all do
# This lambda transforms a positional step method args into
# keyword arguments.
# It's needed to test numeric_step behaviour with keyword arguments.
@step_args = ->(*args) do
kw_args = {to: args[0]}
kw_args[:by] = args[1] if args.size == 2
[kw_args]
end
end
it_behaves_like :numeric_step, :step
end
describe 'with mixed arguments' do
it "doesn't raise an error when step is 0" do
lambda { 1.step(5, by: 0) { break } }.should_not raise_error
end
it "doesn't raise an error when step is 0.0" do
lambda { 1.step(2, by: 0.0) { break } }.should_not raise_error
end
it "raises a ArgumentError when limit and to are defined" do
lambda { 1.step(5, 1, to: 5) { break } }.should raise_error(ArgumentError)
end
it "raises a ArgumentError when step and by are defined" do
lambda { 1.step(5, 1, by: 5) { break } }.should raise_error(ArgumentError)
end
it "should loop over self when step is 0 or 0.0" do
1.step(2, by: 0.0).take(5).should eql [1.0, 1.0, 1.0, 1.0, 1.0]
1.step(2, by: 0).take(5).should eql [1, 1, 1, 1, 1]
1.1.step(2, by: 0).take(5).should eql [1.1, 1.1, 1.1, 1.1, 1.1]
end
describe "when no block is given" do
describe "returned Enumerator" do
describe "size" do
it "should return infinity_value when step is 0" do
1.step(5, by: 0).size.should == infinity_value
end
it "should return infinity_value when step is 0.0" do
1.step(2, by: 0.0).size.should == infinity_value
end
end
end
end
before :all do
# This lambda definition transforms a positional step method args into
# a mix of positional and keyword arguments.
# It's needed to test numeric_step behaviour with positional mixed with
# keyword arguments.
@step_args = ->(*args) do
if args.size == 2
[args[0], {by: args[1]}]
else
args
end
end
end
it_behaves_like :numeric_step, :step
end
end
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