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Contents
require File.expand_path('../../../spec_helper', __FILE__)
describe "Range#step" do
it "passes each nth element to the block" do
a = []
(-5..5).step(2) { |x| a << x }
a.should == [-5, -3, -1, 1, 3, 5]
a = []
("A".."F").step(2) { |x| a << x }
a.should == ["A", "C", "E"]
a = []
("A"..."G").step(2) { |x| a << x }
a.should == ["A", "C", "E"]
a = []
(0.5..2.4).step(0.5) { |x| a << x }
a.should == [0.5, 1, 1.5, 2]
end
it "raises an ArgumentError if stepsize is 0 or negative" do
lambda { (-5..5).step(0) { |x| x } }.should raise_error(ArgumentError)
lambda { (-5.5..5.7).step(0.0) { |x| x } }.should raise_error(ArgumentError)
lambda { (-5..5).step(-2) { |x| x } }.should raise_error(ArgumentError)
end
it "raises a TypeError if the first element does not respond to #succ" do
b = mock('x')
(a = mock('1')).should_receive(:<=>).with(b).and_return(1)
a.should_not respond_to(:succ)
lambda { (a..b).step(1) { |i| i } }.should raise_error(TypeError)
end
it "returns self" do
(1..10).step(1) {}.should == (1..10)
end
it "raises TypeError if the argument is non-numeric" do
obj = mock("mock")
lambda { (1..10).step(obj) {} }.should raise_error(TypeError)
end
it "coerces the argument to integer by invoking to_int" do
(obj = mock("2")).should_receive(:to_int).and_return(2)
res = []
(1..10).step(obj) {|x| res << x}
res.should == [1, 3, 5, 7, 9]
end
ruby_version_is "1.8.7" do
it "returns an enumerator when no block given" do
enum = (1..10).step(4)
enum.should be_an_instance_of(enumerator_class)
enum.to_a.should == [1, 5, 9]
end
end
end
Version data entries
52 entries across 52 versions & 2 rubygems