1 files changed, 113 insertions, 0 deletions
diff --git a/spec/ruby/core/float/comparison_spec.rb b/spec/ruby/core/float/comparison_spec.rb
new file mode 100644
index 0000000000..0cd290f4ad
--- /dev/null
+++ b/spec/ruby/core/float/comparison_spec.rb
@@ -0,0 +1,113 @@
+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 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