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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 when either argument is NaN" do
(nan_value <=> 71.2).should be_nil
(1771.176 <=> nan_value).should be_nil
end
it "returns nil when the given argument is not a Float" do
(1.0 <=> "1").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
ruby_version_is "2.5" do
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
end
# The 4 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 -Infinity and other is negative" 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
end
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