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108 lines
2.7 KiB
Ruby
108 lines
2.7 KiB
Ruby
require_relative '../../spec_helper'
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describe "Float#<=>" do
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it "returns -1, 0, 1 when self is less than, equal, or greater than other" do
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(1.5 <=> 5).should == -1
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(2.45 <=> 2.45).should == 0
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((bignum_value*1.1) <=> bignum_value).should == 1
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end
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it "returns nil when either argument is NaN" do
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(nan_value <=> 71.2).should be_nil
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(1771.176 <=> nan_value).should be_nil
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end
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it "returns nil when the given argument is not a Float" do
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(1.0 <=> "1").should be_nil
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(1.0 <=> "1".freeze).should be_nil
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(1.0 <=> :one).should be_nil
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(1.0 <=> true).should be_nil
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end
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it "compares using #coerce when argument is not a Float" do
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klass = Class.new do
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attr_reader :call_count
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def coerce(other)
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@call_count ||= 0
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@call_count += 1
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[other, 42.0]
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end
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end
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coercible = klass.new
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(2.33 <=> coercible).should == -1
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(42.0 <=> coercible).should == 0
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(43.0 <=> coercible).should == 1
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coercible.call_count.should == 3
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end
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it "raises TypeError when #coerce misbehaves" do
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klass = Class.new do
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def coerce(other)
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:incorrect
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end
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end
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bad_coercible = klass.new
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-> {
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4.2 <=> bad_coercible
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}.should raise_error(TypeError, "coerce must return [x, y]")
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end
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# The 4 tests below are taken from matz's revision 23730 for Ruby trunk
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#
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it "returns 1 when self is Infinity and other is an Integer" do
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(infinity_value <=> Float::MAX.to_i*2).should == 1
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end
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it "returns -1 when self is negative and other is Infinity" do
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(-Float::MAX.to_i*2 <=> infinity_value).should == -1
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end
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it "returns -1 when self is -Infinity and other is negative" do
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(-infinity_value <=> -Float::MAX.to_i*2).should == -1
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end
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it "returns 1 when self is negative and other is -Infinity" do
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(-Float::MAX.to_i*2 <=> -infinity_value).should == 1
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end
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it "returns 0 when self is Infinity and other other is infinite?=1" do
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obj = Object.new
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def obj.infinite?
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1
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end
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(infinity_value <=> obj).should == 0
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end
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it "returns 1 when self is Infinity and other is infinite?=-1" do
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obj = Object.new
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def obj.infinite?
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-1
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end
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(infinity_value <=> obj).should == 1
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end
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it "returns 1 when self is Infinity and other is infinite?=nil (which means finite)" do
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obj = Object.new
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def obj.infinite?
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nil
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end
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(infinity_value <=> obj).should == 1
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end
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it "returns 0 for -0.0 and 0.0" do
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(-0.0 <=> 0.0).should == 0
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(0.0 <=> -0.0).should == 0
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end
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it "returns 0 for -0.0 and 0" do
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(-0.0 <=> 0).should == 0
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(0 <=> -0.0).should == 0
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end
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it "returns 0 for 0.0 and 0" do
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(0.0 <=> 0).should == 0
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(0 <=> 0.0).should == 0
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end
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end
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