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diff --git a/spec/ruby/core/bignum/comparison_spec.rb b/spec/ruby/core/bignum/comparison_spec.rb
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+++ b/spec/ruby/core/bignum/comparison_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "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
+
+    ruby_version_is ""..."2.5" do
+      it "returns nil if #coerce raises an exception" do
+        @num.should_receive(:coerce).with(@big).and_raise(RuntimeError)
+        lambda {
+          @result = (@big <=> @num)
+        }.should complain(/Numerical comparison operators will no more rescue exceptions/)
+        @result.should be_nil
+      end
+    end
+
+    ruby_version_is "2.5" do
+      it "lets the exception go through if #coerce raises an exception" do
+        @num.should_receive(:coerce).with(@big).and_raise(RuntimeError.new("my error"))
+        lambda {
+          @big <=> @num
+        }.should raise_error(RuntimeError, "my error")
+      end
+    end
+
+    it "raises an exception if #coerce raises a non-StandardError exception" do
+      @num.should_receive(:coerce).with(@big).and_raise(Exception)
+      lambda { @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 Infinty" 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