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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#rotate" do
describe "when passed no argument" do
it "returns a copy of the array with the first element moved at the end" do
[1, 2, 3, 4, 5].rotate.should == [2, 3, 4, 5, 1]
end
end
describe "with an argument n" do
it "returns a copy of the array with the first (n % size) elements moved at the end" do
a = [1, 2, 3, 4, 5]
a.rotate( 2).should == [3, 4, 5, 1, 2]
a.rotate( -1).should == [5, 1, 2, 3, 4]
a.rotate(-21).should == [5, 1, 2, 3, 4]
a.rotate( 13).should == [4, 5, 1, 2, 3]
a.rotate( 0).should == a
end
it "coerces the argument using to_int" do
[1, 2, 3].rotate(2.6).should == [3, 1, 2]
obj = mock('integer_like')
obj.should_receive(:to_int).and_return(2)
[1, 2, 3].rotate(obj).should == [3, 1, 2]
end
it "raises a TypeError if not passed an integer-like argument" do
lambda {
[1, 2].rotate(nil)
}.should raise_error(TypeError)
lambda {
[1, 2].rotate("4")
}.should raise_error(TypeError)
end
end
it "returns a copy of the array when its length is one or zero" do
[1].rotate.should == [1]
[1].rotate(2).should == [1]
[1].rotate(-42).should == [1]
[ ].rotate.should == []
[ ].rotate(2).should == []
[ ].rotate(-42).should == []
end
it "does not mutate the receiver" do
lambda {
[].freeze.rotate
[2].freeze.rotate(2)
[1,2,3].freeze.rotate(-3)
}.should_not raise_error
end
it "does not return self" do
a = [1, 2, 3]
a.rotate.should_not equal(a)
a = []
a.rotate(0).should_not equal(a)
end
it "does not return subclass instance for Array subclasses" do
ArraySpecs::MyArray[1, 2, 3].rotate.should be_an_instance_of(Array)
end
end
describe "Array#rotate!" do
describe "when passed no argument" do
it "moves the first element to the end and returns self" do
a = [1, 2, 3, 4, 5]
a.rotate!.should equal(a)
a.should == [2, 3, 4, 5, 1]
end
end
describe "with an argument n" do
it "moves the first (n % size) elements at the end and returns self" do
a = [1, 2, 3, 4, 5]
a.rotate!(2).should equal(a)
a.should == [3, 4, 5, 1, 2]
a.rotate!(-12).should equal(a)
a.should == [1, 2, 3, 4, 5]
a.rotate!(13).should equal(a)
a.should == [4, 5, 1, 2, 3]
end
it "coerces the argument using to_int" do
[1, 2, 3].rotate!(2.6).should == [3, 1, 2]
obj = mock('integer_like')
obj.should_receive(:to_int).and_return(2)
[1, 2, 3].rotate!(obj).should == [3, 1, 2]
end
it "raises a TypeError if not passed an integer-like argument" do
lambda {
[1, 2].rotate!(nil)
}.should raise_error(TypeError)
lambda {
[1, 2].rotate!("4")
}.should raise_error(TypeError)
end
end
it "does nothing and returns self when the length is zero or one" do
a = [1]
a.rotate!.should equal(a)
a.should == [1]
a.rotate!(2).should equal(a)
a.should == [1]
a.rotate!(-21).should equal(a)
a.should == [1]
a = []
a.rotate!.should equal(a)
a.should == []
a.rotate!(2).should equal(a)
a.should == []
a.rotate!(-21).should equal(a)
a.should == []
end
it "raises a RuntimeError on a frozen array" do
lambda { [1, 2, 3].freeze.rotate!(0) }.should raise_error(RuntimeError)
lambda { [1].freeze.rotate!(42) }.should raise_error(RuntimeError)
lambda { [].freeze.rotate! }.should raise_error(RuntimeError)
end
end
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