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require_relative '../../spec_helper'
describe "Integer#<=>" do
context "fixnum" do
it "returns -1 when self is less than the given argument" do
(-3 <=> -1).should == -1
(-5 <=> 10).should == -1
(-5 <=> -4.5).should == -1
end
it "returns 0 when self is equal to the given argument" do
(0 <=> 0).should == 0
(954 <=> 954).should == 0
(954 <=> 954.0).should == 0
end
it "returns 1 when self is greater than the given argument" do
(496 <=> 5).should == 1
(200 <=> 100).should == 1
(51 <=> 50.5).should == 1
end
it "returns nil when the given argument is not an Integer" do
(3 <=> mock('x')).should == nil
(3 <=> 'test').should == nil
end
end
context "bignum" do
describe "with a Fixnum" do
it "returns -1 when other is larger" do
(-bignum_value <=> 2).should == -1
end
it "returns 1 when other is smaller" do
(bignum_value <=> 2).should == 1
end
end
describe "with a Bignum" do
describe "when other is negative" do
it "returns -1 when self is negative and other is larger" do
(-bignum_value(42) <=> -bignum_value).should == -1
end
it "returns 0 when other is equal" do
(-bignum_value <=> -bignum_value).should == 0
end
it "returns 1 when self is negative and other is smaller" do
(-bignum_value <=> -bignum_value(94)).should == 1
end
it "returns 1 when self is positive" do
(bignum_value <=> -bignum_value).should == 1
end
end
describe "when other is positive" do
it "returns -1 when self is negative" do
(-bignum_value <=> bignum_value).should == -1
end
it "returns -1 when self is positive and other is larger" do
(bignum_value <=> bignum_value(38)).should == -1
end
it "returns 0 when other is equal" do
(bignum_value <=> bignum_value).should == 0
end
it "returns 1 when other is smaller" do
(bignum_value(56) <=> bignum_value).should == 1
end
end
end
describe "with a Float" do
describe "when other is negative" do
it "returns -1 when self is negative and other is larger" do
(-bignum_value(0xffff) <=> -bignum_value.to_f).should == -1
end
it "returns 0 when other is equal" do
(-bignum_value <=> -bignum_value.to_f).should == 0
end
it "returns 1 when self is negative and other is smaller" do
(-bignum_value <=> -bignum_value(0xffef).to_f).should == 1
end
it "returns 1 when self is positive" do
(bignum_value <=> -bignum_value.to_f).should == 1
end
end
describe "when other is positive" do
it "returns -1 when self is negative" do
(-bignum_value <=> bignum_value.to_f).should == -1
end
it "returns -1 when self is positive and other is larger" do
(bignum_value <=> bignum_value(0xfffe).to_f).should == -1
end
it "returns 0 when other is equal" do
(bignum_value <=> bignum_value.to_f).should == 0
end
it "returns 1 when other is smaller" do
(bignum_value(0xfeff) <=> bignum_value.to_f).should == 1
end
end
end
describe "with an Object" do
before :each do
@big = bignum_value
@num = mock("value for Bignum#<=>")
end
it "calls #coerce on other" do
@num.should_receive(:coerce).with(@big).and_return([@big.to_f, 2.5])
@big <=> @num
end
it "lets the exception go through if #coerce raises an exception" do
@num.should_receive(:coerce).with(@big).and_raise(RuntimeError.new("my error"))
-> {
@big <=> @num
}.should raise_error(RuntimeError, "my error")
end
it "raises an exception if #coerce raises a non-StandardError exception" do
@num.should_receive(:coerce).with(@big).and_raise(Exception)
-> { @big <=> @num }.should raise_error(Exception)
end
it "returns nil if #coerce does not return an Array" do
@num.should_receive(:coerce).with(@big).and_return(nil)
(@big <=> @num).should be_nil
end
it "returns -1 if the coerced value is larger" do
@num.should_receive(:coerce).with(@big).and_return([@big, bignum_value(10)])
(@big <=> @num).should == -1
end
it "returns 0 if the coerced value is equal" do
@num.should_receive(:coerce).with(@big).and_return([@big, bignum_value])
(@big <=> @num).should == 0
end
it "returns 1 if the coerced value is smaller" do
@num.should_receive(:coerce).with(@big).and_return([@big, 22])
(@big <=> @num).should == 1
end
end
# The tests below are taken from matz's revision 23730 for Ruby trunk
it "returns 1 when self is Infinity and other is a Bignum" do
(infinity_value <=> Float::MAX.to_i*2).should == 1
end
it "returns -1 when self is negative and other is Infinity" do
(-Float::MAX.to_i*2 <=> infinity_value).should == -1
end
it "returns 1 when self is negative and other is -Infinity" do
(-Float::MAX.to_i*2 <=> -infinity_value).should == 1
end
it "returns -1 when self is -Infinity and other is negative" do
(-infinity_value <=> -Float::MAX.to_i*2).should == -1
end
end
end
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