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require_relative '../../spec_helper'
describe "Float#<=>" do
it "returns -1, 0, 1 when self is less than, equal, or greater than other" do
(1.5 <=> 5).should == -1
(2.45 <=> 2.45).should == 0
((bignum_value*1.1) <=> bignum_value).should == 1
end
it "returns nil if one side is NaN" do
[1.0, 42, bignum_value].each { |n|
(nan_value <=> n).should == nil
(n <=> nan_value).should == nil
}
end
it "handles positive infinity" do
[1.0, 42, bignum_value].each { |n|
(infinity_value <=> n).should == 1
(n <=> infinity_value).should == -1
}
end
it "handles negative infinity" do
[1.0, 42, bignum_value].each { |n|
(-infinity_value <=> n).should == -1
(n <=> -infinity_value).should == 1
}
end
it "returns nil when the given argument is not a Float" do
(1.0 <=> "1").should be_nil
(1.0 <=> "1".freeze).should be_nil
(1.0 <=> :one).should be_nil
(1.0 <=> true).should be_nil
end
it "compares using #coerce when argument is not a Float" do
klass = Class.new do
attr_reader :call_count
def coerce(other)
@call_count ||= 0
@call_count += 1
[other, 42.0]
end
end
coercible = klass.new
(2.33 <=> coercible).should == -1
(42.0 <=> coercible).should == 0
(43.0 <=> coercible).should == 1
coercible.call_count.should == 3
end
it "raises TypeError when #coerce misbehaves" do
klass = Class.new do
def coerce(other)
:incorrect
end
end
bad_coercible = klass.new
-> {
4.2 <=> bad_coercible
}.should raise_error(TypeError, "coerce must return [x, y]")
end
it "returns the correct result when one side is infinite" do
(infinity_value <=> Float::MAX.to_i*2).should == 1
(-Float::MAX.to_i*2 <=> infinity_value).should == -1
(-infinity_value <=> -Float::MAX.to_i*2).should == -1
(-Float::MAX.to_i*2 <=> -infinity_value).should == 1
end
it "returns 0 when self is Infinity and other other is infinite?=1" do
obj = Object.new
def obj.infinite?
1
end
(infinity_value <=> obj).should == 0
end
it "returns 1 when self is Infinity and other is infinite?=-1" do
obj = Object.new
def obj.infinite?
-1
end
(infinity_value <=> obj).should == 1
end
it "returns 1 when self is Infinity and other is infinite?=nil (which means finite)" do
obj = Object.new
def obj.infinite?
nil
end
(infinity_value <=> obj).should == 1
end
it "returns 0 for -0.0 and 0.0" do
(-0.0 <=> 0.0).should == 0
(0.0 <=> -0.0).should == 0
end
it "returns 0 for -0.0 and 0" do
(-0.0 <=> 0).should == 0
(0 <=> -0.0).should == 0
end
it "returns 0 for 0.0 and 0" do
(0.0 <=> 0).should == 0
(0 <=> 0.0).should == 0
end
end
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