Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/fixnum/abs_spec.rb

@@ -0,0 +1,7 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/abs', __FILE__)
+
+describe "Fixnum#abs" do
+  it_behaves_like :fixnum_abs, :abs
+end
+

spec/ruby/core/fixnum/bit_and_spec.rb

@@ -0,0 +1,46 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#&" do
+  it "returns self bitwise AND other" do
+    (256 & 16).should == 0
+    (2010 & 5).should == 0
+    (65535 & 1).should == 1
+    (0xffff & bignum_value + 0xffff_ffff).should == 65535
+  end
+
+  it "returns self bitwise AND other when one operand is negative" do
+    ((1 << 33) & -1).should == (1 << 33)
+    (-1 & (1 << 33)).should == (1 << 33)
+
+    ((-(1<<33)-1) & 5).should == 5
+    (5 & (-(1<<33)-1)).should == 5
+  end
+
+  it "returns self bitwise AND other when both operands are negative" do
+    (-5 & -1).should == -5
+    (-3 & -4).should == -4
+    (-12 & -13).should == -16
+    (-13 & -12).should == -16
+  end
+
+  it "returns self bitwise AND a Bignum" do
+    (-1 & 2**64).should == 18446744073709551616
+  end
+
+  it "coerces the rhs and calls #coerce" do
+    obj = mock("fixnum bit and")
+    obj.should_receive(:coerce).with(6).and_return([3, 6])
+    (6 & obj).should == 2
+  end
+
+  it "raises a TypeError when passed a Float" do
+    lambda { (3 & 3.4) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError and does not call #to_int when defined on an object" do
+    obj = mock("fixnum bit and")
+    obj.should_not_receive(:to_int)
+
+    lambda { 3 & obj }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/bit_length_spec.rb

@@ -0,0 +1,42 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#bit_length" do
+  it "returns the position of the leftmost bit of a positive number" do
+    0.bit_length.should == 0
+    1.bit_length.should == 1
+    2.bit_length.should == 2
+    3.bit_length.should == 2
+    4.bit_length.should == 3
+    n = fixnum_max.bit_length
+    fixnum_max[n].should == 0
+    fixnum_max[n-1].should == 1
+
+    0.bit_length.should == 0
+    1.bit_length.should == 1
+    0xff.bit_length.should == 8
+    0x100.bit_length.should == 9
+    (2**12-1).bit_length.should == 12
+    (2**12).bit_length.should == 13
+    (2**12+1).bit_length.should == 13
+  end
+
+  it "returns the position of the leftmost 0 bit of a negative number" do
+    -1.bit_length.should == 0
+    -2.bit_length.should == 1
+    -3.bit_length.should == 2
+    -4.bit_length.should == 2
+    -5.bit_length.should == 3
+    n = fixnum_min.bit_length
+    fixnum_min[n].should == 1
+    fixnum_min[n-1].should == 0
+
+    (-2**12-1).bit_length.should == 13
+    (-2**12).bit_length.should == 12
+    (-2**12+1).bit_length.should == 12
+    -0x101.bit_length.should == 9
+    -0x100.bit_length.should == 8
+    -0xff.bit_length.should == 8
+    -2.bit_length.should == 1
+    -1.bit_length.should == 0
+  end
+end

spec/ruby/core/fixnum/bit_or_spec.rb

@@ -0,0 +1,26 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#|" do
+  it "returns self bitwise OR other" do
+    (1 | 0).should == 1
+    (5 | 4).should == 5
+    (5 | 6).should == 7
+    (248 | 4096).should == 4344
+    (0xffff | bignum_value + 0xf0f0).should == 0x8000_0000_0000_ffff
+  end
+
+  it "returns self bitwise OR a Bignum" do
+    (-1 | 2**64).should == -1
+  end
+
+  it "raises a TypeError when passed a Float" do
+    lambda { (3 | 3.4) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError and does not call #to_int when defined on an object" do
+    obj = mock("fixnum bit or")
+    obj.should_not_receive(:to_int)
+
+    lambda { 3 | obj }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/bit_xor_spec.rb

@@ -0,0 +1,24 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#^" do
+  it "returns self bitwise EXCLUSIVE OR other" do
+    (3 ^ 5).should == 6
+    (-2 ^ -255).should == 255
+    (5 ^ bignum_value + 0xffff_ffff).should == 0x8000_0000_ffff_fffa
+  end
+
+  it "returns self bitwise EXCLUSIVE OR a Bignum" do
+    (-1 ^ 2**64).should == -18446744073709551617
+  end
+
+  it "raises a TypeError when passed a Float" do
+    lambda { (3 ^ 3.4) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError and does not call #to_int when defined on an object" do
+    obj = mock("fixnum bit xor")
+    obj.should_not_receive(:to_int)
+
+    lambda { 3 ^ obj }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/case_compare_spec.rb

@@ -0,0 +1,6 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/equal', __FILE__)
+
+describe "Fixnum#===" do
+  it_behaves_like :fixnum_equal, :===
+end

spec/ruby/core/fixnum/coerce_spec.rb

@@ -0,0 +1,39 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#coerce when given a Fixnum" do
+  it "returns an array containing two Fixnums" do
+    1.coerce(2).should == [2, 1]
+    1.coerce(2).map { |i| i.class }.should == [Fixnum, Fixnum]
+  end
+end
+
+describe "Fixnum#coerce when given a String" do
+  it "raises an ArgumentError when trying to coerce with a non-number String" do
+    lambda { 1.coerce(":)") }.should raise_error(ArgumentError)
+  end
+
+  it "returns  an array containing two Floats" do
+    1.coerce("2").should == [2.0, 1.0]
+    1.coerce("-2").should == [-2.0, 1.0]
+  end
+end
+
+describe "Fixnum#coerce" do
+  it "raises a TypeError when trying to coerce with nil" do
+    lambda { 1.coerce(nil) }.should raise_error(TypeError)
+  end
+
+  it "tries to convert the given Object into a Float by using #to_f" do
+    (obj = mock('1.0')).should_receive(:to_f).and_return(1.0)
+    2.coerce(obj).should == [1.0, 2.0]
+
+    (obj = mock('0')).should_receive(:to_f).and_return('0')
+    lambda { 2.coerce(obj).should == [1.0, 2.0] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when given an Object that does not respond to #to_f" do
+    lambda { 1.coerce(mock('x'))  }.should raise_error(TypeError)
+    lambda { 1.coerce(1..4)       }.should raise_error(TypeError)
+    lambda { 1.coerce(:test)      }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/comparison_spec.rb

@@ -0,0 +1,26 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#<=>" do
+  it "returns -1 when self is less than the given argument" do
+    (-3 <=> -1).should == -1
+    (-5 <=> 10).should == -1
+    (-5 <=> -4.5).should == -1
+  end
+
+  it "returns 0 when self is equal to the given argument" do
+    (0 <=> 0).should == 0
+    (954 <=> 954).should == 0
+    (954 <=> 954.0).should == 0
+  end
+
+  it "returns 1 when self is greater than the given argument" do
+    (496 <=> 5).should == 1
+    (200 <=> 100).should == 1
+    (51 <=> 50.5).should == 1
+  end
+
+  it "returns nil when the given argument is not an Integer" do
+    (3 <=> mock('x')).should == nil
+    (3 <=> 'test').should == nil
+  end
+end

spec/ruby/core/fixnum/complement_spec.rb

@@ -0,0 +1,10 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#~" do
+  it "returns self with each bit flipped" do
+    (~0).should == -1
+    (~1221).should == -1222
+    (~-2).should == 1
+    (~-599).should == 598
+  end
+end

spec/ruby/core/fixnum/div_spec.rb

@@ -0,0 +1,44 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#div with a Fixnum" do
+  it "returns self divided by the given argument as an Integer" do
+    2.div(2).should == 1
+    1.div(2).should == 0
+    5.div(2).should == 2
+  end
+end
+
+describe "Fixnum#div" do
+  it "rounds towards -inf" do
+    8192.div(10).should == 819
+    8192.div(-10).should == -820
+    (-8192).div(10).should == -820
+    (-8192).div(-10).should == 819
+  end
+
+  it "coerces self and the given argument to Floats and returns self divided by other as Fixnum" do
+    1.div(0.2).should == 5
+    1.div(0.16).should == 6
+    1.div(0.169).should == 5
+    -1.div(50.4).should == -1
+    1.div(bignum_value).should == 0
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+    lambda { 0.div(0.0)   }.should raise_error(ZeroDivisionError)
+    lambda { 10.div(0.0)  }.should raise_error(ZeroDivisionError)
+    lambda { -10.div(0.0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0" do
+    lambda { 13.div(0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13.div(obj)
+    }.should raise_error(TypeError)
+    lambda { 5.div("2") }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/divide_spec.rb

@@ -0,0 +1,35 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#/" do
+  it "returns self divided by the given argument" do
+    (2 / 2).should == 1
+    (3 / 2).should == 1
+  end
+
+  it "supports dividing negative numbers" do
+    (-1 / 10).should == -1
+  end
+
+  it "raises a ZeroDivisionError if the given argument is zero and not a Float" do
+    lambda { 1 / 0 }.should raise_error(ZeroDivisionError)
+  end
+
+  it "does NOT raise ZeroDivisionError if the given argument is zero and is a Float" do
+    (1 / 0.0).to_s.should == 'Infinity'
+    (-1 / 0.0).to_s.should == '-Infinity'
+  end
+
+  it "coerces fixnum and return self divided by other" do
+    (-1 / 50.4).should be_close(-0.0198412698412698, TOLERANCE)
+    (1 / bignum_value).should == 0
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13 / obj
+    }.should raise_error(TypeError)
+    lambda { 13 / "10"    }.should raise_error(TypeError)
+    lambda { 13 / :symbol }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/divmod_spec.rb

@@ -0,0 +1,35 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#divmod" do
+  it "returns an Array containing quotient and modulus obtained from dividing self by the given argument" do
+    13.divmod(4).should == [3, 1]
+    4.divmod(13).should == [0, 4]
+
+    13.divmod(4.0).should == [3, 1]
+    4.divmod(13.0).should == [0, 4]
+
+    1.divmod(2.0).should == [0, 1.0]
+    200.divmod(bignum_value).should == [0, 200]
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0" do
+    lambda { 13.divmod(0)  }.should raise_error(ZeroDivisionError)
+    lambda { 0.divmod(0)   }.should raise_error(ZeroDivisionError)
+    lambda { -10.divmod(0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+    lambda { 0.divmod(0.0)   }.should raise_error(ZeroDivisionError)
+    lambda { 10.divmod(0.0)  }.should raise_error(ZeroDivisionError)
+    lambda { -10.divmod(0.0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13.divmod(obj)
+    }.should raise_error(TypeError)
+    lambda { 13.divmod("10")    }.should raise_error(TypeError)
+    lambda { 13.divmod(:symbol) }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/element_reference_spec.rb

@@ -0,0 +1,80 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#[]" do
+  it "behaves like (n >> b) & 1" do
+    0b101[1].should == 0
+    0b101[2].should == 1
+  end
+
+  it "returns 1 if the nth bit is set" do
+    15[1].should == 1
+  end
+
+  it "returns 1 if the nth bit is set (in two's-complement representation)" do
+    (-1)[1].should == 1
+  end
+
+  it "returns 0 if the nth bit is not set" do
+    8[2].should == 0
+  end
+
+  it "returns 0 if the nth bit is not set (in two's-complement representation)" do
+    (-2)[0].should == 0
+  end
+
+  it "returns 0 if the nth bit is greater than the most significant bit" do
+    2[3].should == 0
+  end
+
+  it "returns 1 if self is negative and the nth bit is greater than the most significant bit" do
+    (-1)[3].should == 1
+  end
+
+  it "returns 0 when passed a negative argument" do
+    3[-1].should == 0
+    (-1)[-1].should == 0
+  end
+
+  it "calls #to_int to convert the argument to an Integer and returns 1 if the nth bit is set" do
+    obj = mock('1')
+    obj.should_receive(:to_int).and_return(1)
+
+    2[obj].should == 1
+  end
+
+  it "calls #to_int to convert the argument to an Integer and returns 0 if the nth bit is set" do
+    obj = mock('0')
+    obj.should_receive(:to_int).and_return(0)
+
+    2[obj].should == 0
+  end
+
+  it "accepts a Float argument and returns 0 if the bit at the truncated value is not set" do
+    13[1.3].should == 0
+  end
+
+  it "accepts a Float argument and returns 1 if the bit at the truncated value is set" do
+    13[2.1].should == 1
+  end
+
+  it "raises a TypeError when passed a String" do
+    lambda { 3["3"] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when #to_int does not return an Integer" do
+    obj = mock('asdf')
+    obj.should_receive(:to_int).and_return("asdf")
+    lambda { 3[obj] }.should raise_error(TypeError)
+  end
+
+  it "calls #to_int to coerce a String to a Bignum and returns 0" do
+    obj = mock('bignum value')
+    obj.should_receive(:to_int).and_return(bignum_value)
+
+    3[obj].should == 0
+  end
+
+  it "returns 0 when passed a Float in the range of a Bignum" do
+    3[bignum_value.to_f].should == 0
+  end
+end

spec/ruby/core/fixnum/equal_value_spec.rb

@@ -0,0 +1,6 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/equal', __FILE__)
+
+describe "Fixnum#==" do
+  it_behaves_like :fixnum_equal, :==
+end

spec/ruby/core/fixnum/even_spec.rb

@@ -0,0 +1,23 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#even?" do
+  it "is true for zero" do
+    0.even?.should be_true
+  end
+
+  it "is true for even positive Fixnums" do
+    4.even?.should be_true
+  end
+
+  it "is true for even negative Fixnums" do
+    (-4).even?.should be_true
+  end
+
+  it "is false for odd positive Fixnums" do
+    5.even?.should be_false
+  end
+
+  it "is false for odd negative Fixnums" do
+    (-5).even?.should be_false
+  end
+end

spec/ruby/core/fixnum/exponent_spec.rb

@@ -0,0 +1,76 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#**" do
+  it "returns self raised to the given power" do
+    (2 ** 0).should eql 1
+    (2 ** 1).should eql 2
+    (2 ** 2).should eql 4
+
+    (9 ** 0.5).should eql 3.0
+    (5 ** -1).to_f.to_s.should == '0.2'
+
+    (2 ** 40).should eql 1099511627776
+  end
+
+  it "overflows the answer to a bignum transparantly" do
+    (2 ** 29).should eql 536870912
+    (2 ** 30).should eql 1073741824
+    (2 ** 31).should eql 2147483648
+    (2 ** 32).should eql 4294967296
+
+    (2 ** 61).should eql 2305843009213693952
+    (2 ** 62).should eql 4611686018427387904
+    (2 ** 63).should eql 9223372036854775808
+    (2 ** 64).should eql 18446744073709551616
+    (8 ** 23).should eql 590295810358705651712
+  end
+
+  it "raises negative numbers to the given power" do
+    ((-2) ** 29).should eql(-536870912)
+    ((-2) ** 30).should eql(1073741824)
+    ((-2) ** 31).should eql(-2147483648)
+    ((-2) ** 32).should eql(4294967296)
+
+    ((-2) ** 61).should eql(-2305843009213693952)
+    ((-2) ** 62).should eql(4611686018427387904)
+    ((-2) ** 63).should eql(-9223372036854775808)
+    ((-2) ** 64).should eql(18446744073709551616)
+  end
+
+  it "can raise 1 to a Bignum safely" do
+    big = bignum_value(4611686018427387904)
+    (1 ** big).should eql 1
+  end
+
+  it "can raise -1 to a Bignum safely" do
+    ((-1) ** bignum_value(0)).should eql(1)
+    ((-1) ** bignum_value(1)).should eql(-1)
+  end
+
+  it "switches to a Float when the number is too big" do
+    big = bignum_value(4611686018427387904)
+    flt = (2 ** big)
+    flt.should be_kind_of(Float)
+    flt.infinite?.should == 1
+  end
+
+  conflicts_with :Rational do
+    it "raises a ZeroDivisionError for 0**-1" do
+      lambda { (0**-1) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "raises a TypeError when given a non-Integer" do
+      lambda {
+        (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+        13 ** obj
+      }.should raise_error(TypeError)
+      lambda { 13 ** "10"    }.should raise_error(TypeError)
+      lambda { 13 ** :symbol }.should raise_error(TypeError)
+    end
+  end
+
+  it "returns a complex number when negative and raised to a fractional power" do
+    ((-8) ** (1.0/3))      .should be_close(Complex(1, 1.73205), TOLERANCE)
+    ((-8) ** Rational(1,3)).should be_close(Complex(1, 1.73205), TOLERANCE)
+  end
+end

spec/ruby/core/fixnum/fdiv_spec.rb

@@ -0,0 +1,49 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#fdiv" do
+  it "performs floating-point division between self and a Fixnum" do
+    8.fdiv(7).should be_close(1.14285714285714, TOLERANCE)
+  end
+
+  it "performs floating-point division between self and a Bignum" do
+    8.fdiv(bignum_value).should be_close(8.673617379884035e-19, TOLERANCE)
+  end
+
+  it "performs floating-point division between self and a Float" do
+    8.fdiv(9.0).should be_close(0.888888888888889, TOLERANCE)
+  end
+
+  it "returns NaN when the argument is NaN" do
+    -1.fdiv(nan_value).nan?.should be_true
+    1.fdiv(nan_value).nan?.should be_true
+  end
+
+  it "returns Infinity when the argument is 0" do
+    1.fdiv(0).infinite?.should == 1
+  end
+
+  it "returns -Infinity when the argument is 0 and self is negative" do
+    -1.fdiv(0).infinite?.should == -1
+  end
+
+  it "returns Infinity when the argument is 0.0" do
+    1.fdiv(0.0).infinite?.should == 1
+  end
+
+  it "returns -Infinity when the argument is 0.0 and self is negative" do
+    -1.fdiv(0.0).infinite?.should == -1
+  end
+
+  it "raises a TypeError when argument isn't numeric" do
+    lambda { 1.fdiv(mock('non-numeric')) }.should raise_error(TypeError)
+  end
+
+  it "raises an ArgumentError when passed multiple arguments" do
+    lambda { 1.fdiv(6,0.2) }.should raise_error(ArgumentError)
+  end
+
+  it "follows the coercion protocol" do
+    (obj = mock('10')).should_receive(:coerce).with(1).and_return([1, 10])
+    1.fdiv(obj).should == 0.1
+  end
+end

spec/ruby/core/fixnum/fixnum_spec.rb

@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum" do
+  it "includes Comparable" do
+    Fixnum.include?(Comparable).should == true
+  end
+
+  it ".allocate raises a TypeError" do
+    lambda do
+      Fixnum.allocate
+    end.should raise_error(TypeError)
+  end
+
+  it ".new is undefined" do
+    lambda do
+      Fixnum.new
+    end.should raise_error(NoMethodError)
+  end
+end

spec/ruby/core/fixnum/gt_spec.rb

@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#>" do
+  it "returns true if self is greater than the given argument" do
+    (13 > 2).should == true
+    (-500 > -600).should == true
+
+    (1 > 5).should == false
+    (5 > 5).should == false
+
+    (900 > bignum_value).should == false
+    (5 > 4.999).should == true
+  end
+
+  it "raises an ArgumentError when given a non-Integer" do
+    lambda { 5 > "4"       }.should raise_error(ArgumentError)
+    lambda { 5 > mock('x') }.should raise_error(ArgumentError)
+  end
+end

spec/ruby/core/fixnum/gte_spec.rb

@@ -0,0 +1,20 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#>=" do
+  it "returns true if self is greater than or equal to the given argument" do
+    (13 >= 2).should == true
+    (-500 >= -600).should == true
+
+    (1 >= 5).should == false
+    (2 >= 2).should == true
+    (5 >= 5).should == true
+
+    (900 >= bignum_value).should == false
+    (5 >= 4.999).should == true
+  end
+
+  it "raises an ArgumentError when given a non-Integer" do
+    lambda { 5 >= "4"       }.should raise_error(ArgumentError)
+    lambda { 5 >= mock('x') }.should raise_error(ArgumentError)
+  end
+end

spec/ruby/core/fixnum/hash_spec.rb

@@ -0,0 +1,11 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#hash" do
+  it "is provided" do
+    1.respond_to?(:hash).should == true
+  end
+
+  it "is stable" do
+    1.hash.should == 1.hash
+  end
+end

spec/ruby/core/fixnum/left_shift_spec.rb

@@ -0,0 +1,91 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#<< with n << m" do
+  it "returns n shifted left m bits when n > 0, m > 0" do
+    (1 << 1).should == 2
+  end
+
+  it "returns n shifted left m bits when n < 0, m > 0" do
+    (-1 << 1).should == -2
+    (-7 << 1).should == -14
+    (-42 << 2).should == -168
+  end
+
+  it "returns n shifted right m bits when n > 0, m < 0" do
+    (2 << -1).should == 1
+  end
+
+  it "returns n shifted right m bits when n < 0, m < 0" do
+    (-2 << -1).should == -1
+  end
+
+  it "returns 0 when n == 0" do
+    (0 << 1).should == 0
+  end
+
+  it "returns n when n > 0, m == 0" do
+    (1 << 0).should == 1
+  end
+
+  it "returns n when n < 0, m == 0" do
+    (-1 << 0).should == -1
+  end
+
+  it "returns 0 when n > 0, m < 0 and n < 2**-m" do
+    (3 << -2).should == 0
+    (7 << -3).should == 0
+    (127 << -7).should == 0
+
+    # To make sure the exponent is not truncated
+    (7 << -32).should == 0
+    (7 << -64).should == 0
+  end
+
+  it "returns -1 when n < 0, m < 0 and n > -(2**-m)" do
+    (-3 << -2).should == -1
+    (-7 << -3).should == -1
+    (-127 << -7).should == -1
+
+    # To make sure the exponent is not truncated
+    (-7 << -32).should == -1
+    (-7 << -64).should == -1
+  end
+
+  it "returns 0 when m < 0 and m is a Bignum" do
+    (3 << -bignum_value).should == 0
+  end
+
+  it "returns a Bignum == fixnum_max * 2 when fixnum_max << 1 and n > 0" do
+    result = fixnum_max << 1
+    result.should be_an_instance_of(Bignum)
+    result.should == fixnum_max * 2
+  end
+
+  it "returns a Bignum == fixnum_min * 2 when fixnum_min << 1 and n < 0" do
+    result = fixnum_min << 1
+    result.should be_an_instance_of(Bignum)
+    result.should == fixnum_min * 2
+  end
+
+  it "calls #to_int to convert the argument to an Integer" do
+    obj = mock("4")
+    obj.should_receive(:to_int).and_return(4)
+
+    (3 << obj).should == 48
+  end
+
+  it "raises a TypeError when #to_int does not return an Integer" do
+    obj = mock("a string")
+    obj.should_receive(:to_int).and_return("asdf")
+
+    lambda { 3 << obj }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed nil" do
+    lambda { 3 << nil }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed a String" do
+    lambda { 3 << "4" }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/lt_spec.rb

@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#<" do
+  it "returns true if self is less than the given argument" do
+    (2 < 13).should == true
+    (-600 < -500).should == true
+
+    (5 < 1).should == false
+    (5 < 5).should == false
+
+    (900 < bignum_value).should == true
+    (5 < 4.999).should == false
+  end
+
+  it "raises an ArgumentError when given a non-Integer" do
+    lambda { 5 < "4"       }.should raise_error(ArgumentError)
+    lambda { 5 < mock('x') }.should raise_error(ArgumentError)
+  end
+end

spec/ruby/core/fixnum/lte_spec.rb

@@ -0,0 +1,20 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#<=" do
+  it "returns true if self is less than or equal to other" do
+    (2 <= 13).should == true
+    (-600 <= -500).should == true
+
+    (5 <= 1).should == false
+    (5 <= 5).should == true
+    (-2 <= -2).should == true
+
+    (900 <= bignum_value).should == true
+    (5 <= 4.999).should == false
+  end
+
+  it "raises an ArgumentError when given a non-Integer" do
+    lambda { 5 <= "4"       }.should raise_error(ArgumentError)
+    lambda { 5 <= mock('x') }.should raise_error(ArgumentError)
+  end
+end

spec/ruby/core/fixnum/magnitude_spec.rb

@@ -0,0 +1,6 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/abs', __FILE__)
+
+describe "Fixnum#magnitude" do
+  it_behaves_like :fixnum_abs, :magnitude
+end

spec/ruby/core/fixnum/minus_spec.rb

@@ -0,0 +1,29 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#-" do
+  it "returns self minus the given Integer" do
+    (5 - 10).should == -5
+    (9237212 - 5_280).should == 9231932
+
+    (781 - 0.5).should == 780.5
+    (2_560_496 - bignum_value).should == -9223372036852215312
+  end
+
+  it "returns a Bignum only if the result is too large to be a Fixnum" do
+    (5 - 10).should be_an_instance_of Fixnum
+    (-1 - bignum_value).should be_an_instance_of Bignum
+
+    bignum_zero = bignum_value.coerce(0).first
+    (1 - bignum_zero).should be_an_instance_of Fixnum
+    (fixnum_min - 1).should be_an_instance_of(Bignum)
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13 - obj
+    }.should raise_error(TypeError)
+    lambda { 13 - "10"    }.should raise_error(TypeError)
+    lambda { 13 - :symbol }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/modulo_spec.rb

@@ -0,0 +1,10 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/modulo', __FILE__)
+
+describe "Fixnum#%" do
+  it_behaves_like(:fixnum_modulo, :%)
+end
+
+describe "Fixnum#modulo" do
+  it_behaves_like(:fixnum_modulo, :modulo)
+end

spec/ruby/core/fixnum/multiply_spec.rb

@@ -0,0 +1,27 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#*" do
+  it "returns self multiplied by the given Integer" do
+    (4923 * 2).should == 9846
+    (1342177 * 800).should == 1073741600
+    (65536 * 65536).should == 4294967296
+
+    (256 * bignum_value).should == 2361183241434822606848
+    (6712 * 0.25).should == 1678.0
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13 * obj
+    }.should raise_error(TypeError)
+    lambda { 13 * "10"    }.should raise_error(TypeError)
+    lambda { 13 * :symbol }.should raise_error(TypeError)
+  end
+
+  it "overflows to Bignum when the result does not fit in Fixnum" do
+    (fixnum_max * fixnum_max).should be_kind_of(Bignum)
+    (fixnum_max * fixnum_min).should be_kind_of(Bignum)
+  end
+
+end

spec/ruby/core/fixnum/odd_spec.rb

@@ -0,0 +1,23 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#odd?" do
+  it "is false for zero" do
+    0.odd?.should be_false
+  end
+
+  it "is false for even positive Fixnums" do
+    4.odd?.should be_false
+  end
+
+  it "is false for even negative Fixnums" do
+    (-4).odd?.should be_false
+  end
+
+  it "is true for odd positive Fixnums" do
+    5.odd?.should be_true
+  end
+
+  it "is true for odd negative Fixnums" do
+    (-5).odd?.should be_true
+  end
+end

spec/ruby/core/fixnum/plus_spec.rb

@@ -0,0 +1,29 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#+" do
+  it "returns self plus the given Integer" do
+    (491 + 2).should == 493
+    (90210 + 10).should == 90220
+
+    (9 + bignum_value).should == 9223372036854775817
+    (1001 + 5.219).should == 1006.219
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13 + obj
+    }.should raise_error(TypeError)
+    lambda { 13 + "10"    }.should raise_error(TypeError)
+    lambda { 13 + :symbol }.should raise_error(TypeError)
+  end
+
+  it "overflows to Bignum when the result does not fit in Fixnum" do
+    (5 + 10).should be_an_instance_of Fixnum
+    (1 + bignum_value).should be_an_instance_of Bignum
+
+    bignum_zero = bignum_value.coerce(0).first
+    (1 + bignum_zero).should be_an_instance_of Fixnum
+    (fixnum_max + 1).should be_an_instance_of(Bignum)
+  end
+end

spec/ruby/core/fixnum/right_shift_spec.rb

@@ -0,0 +1,91 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#>> with n >> m" do
+  it "returns n shifted right m bits when n > 0, m > 0" do
+    (2 >> 1).should == 1
+  end
+
+  it "returns n shifted right m bits when n < 0, m > 0" do
+    (-2 >> 1).should == -1
+    (-7 >> 1).should == -4
+    (-42 >> 2).should == -11
+  end
+
+  it "returns n shifted left m bits when n > 0, m < 0" do
+    (1 >> -1).should == 2
+  end
+
+  it "returns n shifted left m bits when n < 0, m < 0" do
+    (-1 >> -1).should == -2
+  end
+
+  it "returns 0 when n == 0" do
+    (0 >> 1).should == 0
+  end
+
+  it "returns n when n > 0, m == 0" do
+    (1 >> 0).should == 1
+  end
+
+  it "returns n when n < 0, m == 0" do
+    (-1 >> 0).should == -1
+  end
+
+  it "returns 0 when n > 0, m > 0 and n < 2**m" do
+    (3 >> 2).should == 0
+    (7 >> 3).should == 0
+    (127 >> 7).should == 0
+
+    # To make sure the exponent is not truncated
+    (7 >> 32).should == 0
+    (7 >> 64).should == 0
+  end
+
+  it "returns -1 when n < 0, m > 0 and n > -(2**m)" do
+    (-3 >> 2).should == -1
+    (-7 >> 3).should == -1
+    (-127 >> 7).should == -1
+
+    # To make sure the exponent is not truncated
+    (-7 >> 32).should == -1
+    (-7 >> 64).should == -1
+  end
+
+  it "returns 0 when m is a Bignum" do
+    (3 >> bignum_value).should == 0
+  end
+
+  it "returns a Bignum == fixnum_max * 2 when fixnum_max >> -1 and n > 0" do
+    result = fixnum_max >> -1
+    result.should be_an_instance_of(Bignum)
+    result.should == fixnum_max * 2
+  end
+
+  it "returns a Bignum == fixnum_min * 2 when fixnum_min >> -1 and n < 0" do
+    result = fixnum_min >> -1
+    result.should be_an_instance_of(Bignum)
+    result.should == fixnum_min * 2
+  end
+
+  it "calls #to_int to convert the argument to an Integer" do
+    obj = mock("2")
+    obj.should_receive(:to_int).and_return(2)
+
+    (8 >> obj).should == 2
+  end
+
+  it "raises a TypeError when #to_int does not return an Integer" do
+    obj = mock("a string")
+    obj.should_receive(:to_int).and_return("asdf")
+
+    lambda { 3 >> obj }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed nil" do
+    lambda { 3 >> nil }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed a String" do
+    lambda { 3 >> "4" }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/shared/abs.rb

@@ -0,0 +1,9 @@
+describe :fixnum_abs, shared: true do
+  it "returns self's absolute value" do
+    { 0 => [0, -0, +0], 2 => [2, -2, +2], 100 => [100, -100, +100] }.each do |key, values|
+      values.each do |value|
+        value.send(@method).should == key
+      end
+    end
+  end
+end

spec/ruby/core/fixnum/shared/equal.rb

@@ -0,0 +1,24 @@
+describe :fixnum_equal, shared: true do
+  it "returns true if self has the same value as other" do
+    1.send(@method, 1).should == true
+    9.send(@method, 5).should == false
+
+    # Actually, these call Float#==, Bignum#== etc.
+    9.send(@method, 9.0).should == true
+    9.send(@method, 9.01).should == false
+
+    10.send(@method, bignum_value).should == false
+  end
+
+  it "calls 'other == self' if the given argument is not a Fixnum" do
+    1.send(@method, '*').should == false
+
+    obj = mock('one other')
+    obj.should_receive(:==).any_number_of_times.and_return(false)
+    1.send(@method, obj).should == false
+
+    obj = mock('another')
+    obj.should_receive(:==).any_number_of_times.and_return(true)
+    2.send(@method, obj).should == true
+  end
+end

spec/ruby/core/fixnum/shared/modulo.rb

@@ -0,0 +1,42 @@
+describe :fixnum_modulo, shared: true do
+  it "returns the modulus obtained from dividing self by the given argument" do
+    13.send(@method, 4).should == 1
+    4.send(@method, 13).should == 4
+
+    13.send(@method, 4.0).should == 1
+    4.send(@method, 13.0).should == 4
+
+    (-200).send(@method, 256).should == 56
+    (-1000).send(@method, 512).should == 24
+
+    (-200).send(@method, -256).should == -200
+    (-1000).send(@method, -512).should == -488
+
+    (200).send(@method, -256).should == -56
+    (1000).send(@method, -512).should == -24
+
+    1.send(@method, 2.0).should == 1.0
+    200.send(@method, bignum_value).should == 200
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0" do
+    lambda { 13.send(@method, 0)  }.should raise_error(ZeroDivisionError)
+    lambda { 0.send(@method, 0)   }.should raise_error(ZeroDivisionError)
+    lambda { -10.send(@method, 0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
+    lambda { 0.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+    lambda { 10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+    lambda { -10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
+      13.send(@method, obj)
+    }.should raise_error(TypeError)
+    lambda { 13.send(@method, "10")    }.should raise_error(TypeError)
+    lambda { 13.send(@method, :symbol) }.should raise_error(TypeError)
+  end
+end

spec/ruby/core/fixnum/size_spec.rb

@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#size" do
+  platform_is wordsize: 32 do
+    it "returns the number of bytes in the machine representation of self" do
+      -1.size.should == 4
+      0.size.should == 4
+      4091.size.should == 4
+    end
+  end
+
+  platform_is wordsize: 64 do
+    it "returns the number of bytes in the machine representation of self" do
+      -1.size.should == 8
+      0.size.should == 8
+      4091.size.should == 8
+    end
+  end
+end

spec/ruby/core/fixnum/succ_spec.rb

@@ -0,0 +1,15 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#succ" do
+  it "returns the next larger positive Fixnum" do
+    2.succ.should == 3
+  end
+
+  it "returns the next larger negative Fixnum" do
+    (-2).succ.should == -1
+  end
+
+  it "overflows a Fixnum to a Bignum" do
+    fixnum_max.succ.should == (fixnum_max + 1)
+  end
+end

spec/ruby/core/fixnum/to_f_spec.rb

@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#to_f" do
+  it "returns self converted to a Float" do
+    0.to_f.should == 0.0
+    -500.to_f.should == -500.0
+    9_641_278.to_f.should == 9641278.0
+  end
+end

spec/ruby/core/fixnum/to_s_spec.rb

@@ -0,0 +1,50 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#to_s when given a base" do
+  it "returns self converted to a String in the given base" do
+    12345.to_s(2).should == "11000000111001"
+    12345.to_s(8).should == "30071"
+    12345.to_s(10).should == "12345"
+    12345.to_s(16).should == "3039"
+    95.to_s(16).should == "5f"
+    12345.to_s(36).should == "9ix"
+  end
+
+  it "raises an ArgumentError if the base is less than 2 or higher than 36" do
+    lambda { 123.to_s(-1) }.should raise_error(ArgumentError)
+    lambda { 123.to_s(0)  }.should raise_error(ArgumentError)
+    lambda { 123.to_s(1)  }.should raise_error(ArgumentError)
+    lambda { 123.to_s(37) }.should raise_error(ArgumentError)
+  end
+end
+
+describe "Fixnum#to_s when no base given" do
+  it "returns self converted to a String using base 10" do
+    255.to_s.should == '255'
+    3.to_s.should == '3'
+    0.to_s.should == '0'
+    -9002.to_s.should == '-9002'
+  end
+end
+
+with_feature :encoding do
+  describe "Fixnum#to_s" do
+    before :each do
+      @internal = Encoding.default_internal
+    end
+
+    after :each do
+      Encoding.default_internal = @internal
+    end
+
+    it "returns a String in US-ASCII encoding when Encoding.default_internal is nil" do
+      Encoding.default_internal = nil
+      1.to_s.encoding.should equal(Encoding::US_ASCII)
+    end
+
+    it "returns a String in US-ASCII encoding when Encoding.default_internal is not nil" do
+      Encoding.default_internal = Encoding::IBM437
+      1.to_s.encoding.should equal(Encoding::US_ASCII)
+    end
+  end
+end

spec/ruby/core/fixnum/uminus_spec.rb

@@ -0,0 +1,16 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#-@" do
+  it "returns self as a negative value" do
+    2.send(:-@).should == -2
+    -2.should == -2
+    -268435455.should == -268435455
+    (--5).should == 5
+    -8.send(:-@).should == 8
+  end
+
+  it "negates self at Fixnum/Bignum boundaries" do
+    fixnum_max.send(:-@).should == (0 - fixnum_max)
+    fixnum_min.send(:-@).should == (0 - fixnum_min)
+  end
+end

spec/ruby/core/fixnum/zero_spec.rb

@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Fixnum#zero?" do
+  it "returns true if self is 0" do
+    0.zero?.should == true
+    -1.zero?.should == false
+    1.zero?.should == false
+  end
+end