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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
describe "Array#<=>" do
it "calls <=> left to right and return first non-0 result" do
[-1, +1, nil, "foobar"].each do |result|
lhs = Array.new(3) { mock("#{result}") }
rhs = Array.new(3) { mock("#{result}") }
lhs[0].should_receive(:<=>).with(rhs[0]).and_return(0)
lhs[1].should_receive(:<=>).with(rhs[1]).and_return(result)
lhs[2].should_not_receive(:<=>)
(lhs <=> rhs).should == result
end
end
it "returns 0 if the arrays are equal" do
([] <=> []).should == 0
([1, 2, 3, 4, 5, 6] <=> [1, 2, 3, 4, 5.0, 6.0]).should == 0
end
it "returns -1 if the array is shorter than the other array" do
([] <=> [1]).should == -1
([1, 1] <=> [1, 1, 1]).should == -1
end
it "returns +1 if the array is longer than the other array" do
([1] <=> []).should == +1
([1, 1, 1] <=> [1, 1]).should == +1
end
it "returns -1 if the arrays have same length and a pair of corresponding elements returns -1 for <=>" do
eq_l = mock('an object equal to the other')
eq_r = mock('an object equal to the other')
eq_l.should_receive(:<=>).with(eq_r).any_number_of_times.and_return(0)
less = mock('less than the other')
greater = mock('greater then the other')
less.should_receive(:<=>).with(greater).any_number_of_times.and_return(-1)
rest = mock('an rest element of the arrays')
rest.should_receive(:<=>).with(rest).any_number_of_times.and_return(0)
lhs = [eq_l, eq_l, less, rest]
rhs = [eq_r, eq_r, greater, rest]
(lhs <=> rhs).should == -1
end
it "returns +1 if the arrays have same length and a pair of corresponding elements returns +1 for <=>" do
eq_l = mock('an object equal to the other')
eq_r = mock('an object equal to the other')
eq_l.should_receive(:<=>).with(eq_r).any_number_of_times.and_return(0)
greater = mock('greater then the other')
less = mock('less than the other')
greater.should_receive(:<=>).with(less).any_number_of_times.and_return(+1)
rest = mock('an rest element of the arrays')
rest.should_receive(:<=>).with(rest).any_number_of_times.and_return(0)
lhs = [eq_l, eq_l, greater, rest]
rhs = [eq_r, eq_r, less, rest]
(lhs <=> rhs).should == +1
end
it "properly handles recursive arrays" do
empty = ArraySpecs.empty_recursive_array
(empty <=> empty).should == 0
(empty <=> []).should == 1
([] <=> empty).should == -1
(ArraySpecs.recursive_array <=> []).should == 1
([] <=> ArraySpecs.recursive_array).should == -1
(ArraySpecs.recursive_array <=> ArraySpecs.empty_recursive_array).should == nil
array = ArraySpecs.recursive_array
(array <=> array).should == 0
end
it "tries to convert the passed argument to an Array using #to_ary" do
obj = mock('to_ary')
obj.stub!(:to_ary).and_return([1, 2, 3])
([4, 5] <=> obj).should == ([4, 5] <=> obj.to_ary)
end
it "does not call #to_ary on Array subclasses" do
obj = ArraySpecs::ToAryArray[5, 6, 7]
obj.should_not_receive(:to_ary)
([5, 6, 7] <=> obj).should == 0
end
it "returns nil when the argument is not array-like" do
([] <=> false).should be_nil
end
end
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