Update to ruby/spec@335eb9b

22 files changed, 556 insertions, 344 deletions

diff --git a/spec/ruby/README.md b/spec/ruby/README.md
index df3b991b81..ec744c1165 100644
--- a/spec/ruby/README.md
+++ b/spec/ruby/README.md
@@ -120,6 +120,16 @@ MSpec can automatically add new top-level constants in this file with:
 
 See [CONTRIBUTING.md](https://github.com/ruby/spec/blob/master/CONTRIBUTING.md) for documentation about contributing and writing specs (guards, matchers, etc).
 
+### Dependencies
+
+These command-line executables are needed to run the specs.
+
+* `echo`
+* `stat` for `core/file/*time_spec.rb`
+* `find` for `core/file/fixtures/file_types.rb` (package `findutils`, not needed on Windows)
+
+The file `/etc/services` is required for socket specs (package `netbase` on Debian, not needed on Windows).
+
 ### Socket specs from rubysl-socket
 
 Most specs under `library/socket` were imported from [the rubysl-socket project](https://github.com/rubysl/rubysl-socket).
diff --git a/spec/ruby/core/file/absolute_path_spec.rb b/spec/ruby/core/file/absolute_path_spec.rb
index 52839cf1cc..9f39923472 100644
--- a/spec/ruby/core/file/absolute_path_spec.rb
+++ b/spec/ruby/core/file/absolute_path_spec.rb
@@ -73,6 +73,12 @@ describe "File.absolute_path" do
     File.absolute_path('~').should_not == File.expand_path('~')
   end
 
+  platform_is_not :windows do
+    it "does not expand '~' when given dir argument" do
+      File.absolute_path('~', '/').should == '/~'
+    end
+  end
+
   it "does not expand '~user' to a home directory." do
     path = File.dirname(@abs)
     Dir.chdir(path) do
diff --git a/spec/ruby/core/float/inspect_spec.rb b/spec/ruby/core/float/inspect_spec.rb
new file mode 100644
index 0000000000..4be1927d84
--- /dev/null
+++ b/spec/ruby/core/float/inspect_spec.rb
@@ -0,0 +1,6 @@
+require_relative '../../spec_helper'
+require_relative 'shared/to_s'
+
+describe "Float#inspect" do
+  it_behaves_like :float_to_s, :inspect
+end
diff --git a/spec/ruby/core/float/negative_spec.rb b/spec/ruby/core/float/negative_spec.rb
new file mode 100644
index 0000000000..511d92ade6
--- /dev/null
+++ b/spec/ruby/core/float/negative_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../../spec_helper'
+
+describe "Float#negative?" do
+  describe "on positive numbers" do
+    it "returns false" do
+      0.1.negative?.should be_false
+    end
+  end
+
+  describe "on zero" do
+    it "returns false" do
+      0.0.negative?.should be_false
+    end
+  end
+
+  describe "on negative zero" do
+    it "returns false" do
+      -0.0.negative?.should be_false
+    end
+  end
+
+  describe "on negative numbers" do
+    it "returns true" do
+      -0.1.negative?.should be_true
+    end
+  end
+
+  describe "on NaN" do
+    it "returns false" do
+      nan_value.negative?.should be_false
+    end
+  end
+end
diff --git a/spec/ruby/core/float/positive_spec.rb b/spec/ruby/core/float/positive_spec.rb
new file mode 100644
index 0000000000..575f92a720
--- /dev/null
+++ b/spec/ruby/core/float/positive_spec.rb
@@ -0,0 +1,33 @@
+require_relative '../../spec_helper'
+
+describe "Float#positive?" do
+  describe "on positive numbers" do
+    it "returns true" do
+      0.1.positive?.should be_true
+    end
+  end
+
+  describe "on zero" do
+    it "returns false" do
+      0.0.positive?.should be_false
+    end
+  end
+
+  describe "on negative zero" do
+    it "returns false" do
+      -0.0.positive?.should be_false
+    end
+  end
+
+  describe "on negative numbers" do
+    it "returns false" do
+      -0.1.positive?.should be_false
+    end
+  end
+
+  describe "on NaN" do
+    it "returns false" do
+      nan_value.positive?.should be_false
+    end
+  end
+end
diff --git a/spec/ruby/core/float/round_spec.rb b/spec/ruby/core/float/round_spec.rb
index e143682362..4bd2dc460c 100644
--- a/spec/ruby/core/float/round_spec.rb
+++ b/spec/ruby/core/float/round_spec.rb
@@ -114,4 +114,17 @@ describe "Float#round" do
   it "raise for a non-existent round mode" do
     -> { 14.2.round(half: :nonsense) }.should raise_error(ArgumentError, "invalid rounding mode: nonsense")
   end
+
+  describe "when 0.0 is given" do
+    it "returns self for positive ndigits" do
+      (0.0).round(5).inspect.should == "0.0"
+      (-0.0).round(1).inspect.should == "-0.0"
+    end
+
+    it "returns 0 for 0 or undefined ndigits" do
+      (0.0).round.should == 0
+      (-0.0).round(0).should == 0
+      (0.0).round(half: :up) == 0
+    end
+  end
 end
diff --git a/spec/ruby/core/float/shared/to_s.rb b/spec/ruby/core/float/shared/to_s.rb
new file mode 100644
index 0000000000..0925efc0f7
--- /dev/null
+++ b/spec/ruby/core/float/shared/to_s.rb
@@ -0,0 +1,308 @@
+describe :float_to_s, shared: true do
+  it "returns 'NaN' for NaN" do
+    nan_value().send(@method).should == 'NaN'
+  end
+
+  it "returns 'Infinity' for positive infinity" do
+    infinity_value().send(@method).should == 'Infinity'
+  end
+
+  it "returns '-Infinity' for negative infinity" do
+    (-infinity_value()).send(@method).should == '-Infinity'
+  end
+
+  it "returns '0.0' for 0.0" do
+    0.0.send(@method).should == "0.0"
+  end
+
+  platform_is_not :openbsd do
+    it "emits '-' for -0.0" do
+      -0.0.send(@method).should == "-0.0"
+    end
+  end
+
+  it "emits a '-' for negative values" do
+    -3.14.send(@method).should == "-3.14"
+  end
+
+  it "emits a trailing '.0' for a whole number" do
+    50.0.send(@method).should == "50.0"
+  end
+
+  it "emits a trailing '.0' for the mantissa in e format" do
+    1.0e20.send(@method).should == "1.0e+20"
+  end
+
+  it "uses non-e format for a positive value with fractional part having 5 significant figures" do
+    0.0001.send(@method).should == "0.0001"
+  end
+
+  it "uses non-e format for a negative value with fractional part having 5 significant figures" do
+    -0.0001.send(@method).should == "-0.0001"
+  end
+
+  it "uses e format for a positive value with fractional part having 6 significant figures" do
+    0.00001.send(@method).should == "1.0e-05"
+  end
+
+  it "uses e format for a negative value with fractional part having 6 significant figures" do
+    -0.00001.send(@method).should == "-1.0e-05"
+  end
+
+  it "uses non-e format for a positive value with whole part having 15 significant figures" do
+    10000000000000.0.send(@method).should == "10000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 15 significant figures" do
+    -10000000000000.0.send(@method).should == "-10000000000000.0"
+  end
+
+  it "uses non-e format for a positive value with whole part having 16 significant figures" do
+    100000000000000.0.send(@method).should == "100000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 16 significant figures" do
+    -100000000000000.0.send(@method).should == "-100000000000000.0"
+  end
+
+  it "uses e format for a positive value with whole part having 18 significant figures" do
+    10000000000000000.0.send(@method).should == "1.0e+16"
+  end
+
+  it "uses e format for a negative value with whole part having 18 significant figures" do
+    -10000000000000000.0.send(@method).should == "-1.0e+16"
+  end
+
+  it "uses e format for a positive value with whole part having 17 significant figures" do
+    1000000000000000.0.send(@method).should == "1.0e+15"
+  end
+
+  it "uses e format for a negative value with whole part having 17 significant figures" do
+    -1000000000000000.0.send(@method).should == "-1.0e+15"
+  end
+
+  # #3273
+  it "outputs the minimal, unique form necessary to recreate the value" do
+    value = 0.21611564636388508
+    string = "0.21611564636388508"
+
+    value.send(@method).should == string
+    string.to_f.should == value
+  end
+
+  it "outputs the minimal, unique form to represent the value" do
+    0.56.send(@method).should == "0.56"
+  end
+
+  describe "matches" do
+    it "random examples in all ranges" do
+      # 50.times do
+      #   bytes = (0...8).map { rand(256) }
+      #   string = bytes.pack('C8')
+      #   float = string.unpack('D').first
+      #   puts "#{'%.20g' % float}.send(@method).should == #{float.send(@method).inspect}"
+      # end
+
+      2.5540217314354050325e+163.send(@method).should == "2.554021731435405e+163"
+      2.5492588360356597544e-172.send(@method).should == "2.5492588360356598e-172"
+      1.742770260934704852e-82.send(@method).should == "1.7427702609347049e-82"
+      6.2108093676180883209e-104.send(@method).should == "6.210809367618088e-104"
+      -3.3448803488331067402e-143.send(@method).should == "-3.3448803488331067e-143"
+      -2.2740074343500832557e-168.send(@method).should == "-2.2740074343500833e-168"
+      7.0587971678048535732e+191.send(@method).should == "7.058797167804854e+191"
+      -284438.88327586348169.send(@method).should == "-284438.8832758635"
+      3.953272468476091301e+105.send(@method).should == "3.9532724684760913e+105"
+      -3.6361359552959847853e+100.send(@method).should == "-3.636135955295985e+100"
+      -1.3222325865575206185e-31.send(@method).should == "-1.3222325865575206e-31"
+      1.1440138916932761366e+130.send(@method).should == "1.1440138916932761e+130"
+      4.8750891560387561157e-286.send(@method).should == "4.875089156038756e-286"
+      5.6101113356591453525e-257.send(@method).should == "5.610111335659145e-257"
+      -3.829644279545809575e-100.send(@method).should == "-3.8296442795458096e-100"
+      1.5342839401396406117e-194.send(@method).should == "1.5342839401396406e-194"
+      2.2284972755169921402e-144.send(@method).should == "2.228497275516992e-144"
+      2.1825655917065601737e-61.send(@method).should == "2.1825655917065602e-61"
+      -2.6672271363524338322e-62.send(@method).should == "-2.667227136352434e-62"
+      -1.9257995160119059415e+21.send(@method).should == "-1.925799516011906e+21"
+      -8.9096732962887121718e-198.send(@method).should == "-8.909673296288712e-198"
+      2.0202075376548644959e-90.send(@method).should == "2.0202075376548645e-90"
+      -7.7341602581786258961e-266.send(@method).should == "-7.734160258178626e-266"
+      3.5134482598733635046e+98.send(@method).should == "3.5134482598733635e+98"
+      -2.124411722371029134e+154.send(@method).should == "-2.124411722371029e+154"
+      -4.573908787355718687e+110.send(@method).should == "-4.573908787355719e+110"
+      -1.9344425934170969879e-232.send(@method).should == "-1.934442593417097e-232"
+      -1.3274227399979271095e+171.send(@method).should == "-1.3274227399979271e+171"
+      9.3495270482104442383e-283.send(@method).should == "9.349527048210444e-283"
+      -4.2046059371986483233e+307.send(@method).should == "-4.2046059371986483e+307"
+      3.6133547278583543004e-117.send(@method).should == "3.613354727858354e-117"
+      4.9247416523566613499e-08.send(@method).should == "4.9247416523566613e-08"
+      1.6936145488250064007e-71.send(@method).should == "1.6936145488250064e-71"
+      2.4455483206829433098e+96.send(@method).should == "2.4455483206829433e+96"
+      7.9797449851436455384e+124.send(@method).should == "7.979744985143646e+124"
+      -1.3873689634457876774e-129.send(@method).should == "-1.3873689634457877e-129"
+      3.9761102037533483075e+284.send(@method).should == "3.976110203753348e+284"
+      -4.2819791952139402486e-303.send(@method).should == "-4.28197919521394e-303"
+      -5.7981017546689831298e-116.send(@method).should == "-5.798101754668983e-116"
+      -3.953266497860534199e-28.send(@method).should == "-3.953266497860534e-28"
+      -2.0659852720290440959e-243.send(@method).should == "-2.065985272029044e-243"
+      8.9670488995878688018e-05.send(@method).should == "8.967048899587869e-05"
+      -1.2317943708113061768e-98.send(@method).should == "-1.2317943708113062e-98"
+      -3.8930768307633080463e+248.send(@method).should == "-3.893076830763308e+248"
+      6.5854032671803925627e-239.send(@method).should == "6.5854032671803926e-239"
+      4.6257022188980878952e+177.send(@method).should == "4.625702218898088e+177"
+      -1.9397155125507235603e-187.send(@method).should == "-1.9397155125507236e-187"
+      8.5752156951245705056e+117.send(@method).should == "8.57521569512457e+117"
+      -2.4784875958162501671e-132.send(@method).should == "-2.4784875958162502e-132"
+      -4.4125691841230058457e-203.send(@method).should == "-4.412569184123006e-203"
+    end
+
+    it "random examples in human ranges" do
+      # 50.times do
+      #   formatted = ''
+      #   rand(1..3).times do
+      #     formatted << rand(10).to_s
+      #   end
+      #   formatted << '.'
+      #   rand(1..9).times do
+      #     formatted << rand(10).to_s
+      #   end
+      #   float = formatted.to_f
+      #   puts "#{'%.20f' % float}.send(@method).should == #{float.send(@method).inspect}"
+      # end
+
+      5.17869899999999994122.send(@method).should == "5.178699"
+      905.62695729999995819526.send(@method).should == "905.6269573"
+      62.75999999999999801048.send(@method).should == "62.76"
+      6.93856795800000014651.send(@method).should == "6.938567958"
+      4.95999999999999996447.send(@method).should == "4.96"
+      32.77993899999999882766.send(@method).should == "32.779939"
+      544.12756779999995160324.send(@method).should == "544.1275678"
+      66.25801119999999855281.send(@method).should == "66.2580112"
+      7.90000000000000035527.send(@method).should == "7.9"
+      5.93100000000000004974.send(@method).should == "5.931"
+      5.21229313600000043749.send(@method).should == "5.212293136"
+      503.44173809000000119340.send(@method).should == "503.44173809"
+      79.26000000000000511591.send(@method).should == "79.26"
+      8.51524999999999998579.send(@method).should == "8.51525"
+      174.00000000000000000000.send(@method).should == "174.0"
+      50.39580000000000126192.send(@method).should == "50.3958"
+      35.28999999999999914735.send(@method).should == "35.29"
+      5.43136675399999990788.send(@method).should == "5.431366754"
+      654.07680000000004838512.send(@method).should == "654.0768"
+      6.07423700000000010846.send(@method).should == "6.074237"
+      102.25779799999999397642.send(@method).should == "102.257798"
+      5.08129999999999970584.send(@method).should == "5.0813"
+      6.00000000000000000000.send(@method).should == "6.0"
+      8.30000000000000071054.send(@method).should == "8.3"
+      32.68345999999999662577.send(@method).should == "32.68346"
+      581.11170000000004165486.send(@method).should == "581.1117"
+      76.31342999999999676675.send(@method).should == "76.31343"
+      438.30826000000001840817.send(@method).should == "438.30826"
+      482.06631994000002805478.send(@method).should == "482.06631994"
+      55.92721026899999969828.send(@method).should == "55.927210269"
+      4.00000000000000000000.send(@method).should == "4.0"
+      55.86693999999999959982.send(@method).should == "55.86694"
+      787.98299999999994724931.send(@method).should == "787.983"
+      5.73810511000000023074.send(@method).should == "5.73810511"
+      74.51926810000000500622.send(@method).should == "74.5192681"
+      892.89999999999997726263.send(@method).should == "892.9"
+      68.27299999999999613465.send(@method).should == "68.273"
+      904.10000000000002273737.send(@method).should == "904.1"
+      5.23200000000000020606.send(@method).should == "5.232"
+      4.09628000000000014325.send(@method).should == "4.09628"
+      46.05152633699999853434.send(@method).should == "46.051526337"
+      142.12884990599999923688.send(@method).should == "142.128849906"
+      3.83057023500000015659.send(@method).should == "3.830570235"
+      11.81684594699999912848.send(@method).should == "11.816845947"
+      80.50000000000000000000.send(@method).should == "80.5"
+      382.18215010000000120272.send(@method).should == "382.1821501"
+      55.38444606899999911320.send(@method).should == "55.384446069"
+      5.78000000000000024869.send(@method).should == "5.78"
+      2.88244999999999995666.send(@method).should == "2.88245"
+      43.27709999999999723741.send(@method).should == "43.2771"
+    end
+
+    it "random values from divisions" do
+      (1.0 / 7).send(@method).should == "0.14285714285714285"
+
+      # 50.times do
+      #    a = rand(10)
+      #    b = rand(10)
+      #    c = rand(10)
+      #    d = rand(10)
+      #    expression = "#{a}.#{b} / #{c}.#{d}"
+      #    puts "      (#{expression}).send(@method).should == #{eval(expression).send(@method).inspect}"
+      #  end
+
+      (1.1 / 7.1).send(@method).should == "0.15492957746478875"
+      (6.5 / 8.8).send(@method).should == "0.7386363636363635"
+      (4.8 / 4.3).send(@method).should == "1.1162790697674418"
+      (4.0 / 1.9).send(@method).should == "2.1052631578947367"
+      (9.1 / 0.8).send(@method).should == "11.374999999999998"
+      (5.3 / 7.5).send(@method).should == "0.7066666666666667"
+      (2.8 / 1.8).send(@method).should == "1.5555555555555554"
+      (2.1 / 2.5).send(@method).should == "0.8400000000000001"
+      (3.5 / 6.0).send(@method).should == "0.5833333333333334"
+      (4.6 / 0.3).send(@method).should == "15.333333333333332"
+      (0.6 / 2.4).send(@method).should == "0.25"
+      (1.3 / 9.1).send(@method).should == "0.14285714285714288"
+      (0.3 / 5.0).send(@method).should == "0.06"
+      (5.0 / 4.2).send(@method).should == "1.1904761904761905"
+      (3.0 / 2.0).send(@method).should == "1.5"
+      (6.3 / 2.0).send(@method).should == "3.15"
+      (5.4 / 6.0).send(@method).should == "0.9"
+      (9.6 / 8.1).send(@method).should == "1.1851851851851851"
+      (8.7 / 1.6).send(@method).should == "5.437499999999999"
+      (1.9 / 7.8).send(@method).should == "0.24358974358974358"
+      (0.5 / 2.1).send(@method).should == "0.23809523809523808"
+      (9.3 / 5.8).send(@method).should == "1.6034482758620692"
+      (2.7 / 8.0).send(@method).should == "0.3375"
+      (9.7 / 7.8).send(@method).should == "1.2435897435897436"
+      (8.1 / 2.4).send(@method).should == "3.375"
+      (7.7 / 2.7).send(@method).should == "2.8518518518518516"
+      (7.9 / 1.7).send(@method).should == "4.647058823529412"
+      (6.5 / 8.2).send(@method).should == "0.7926829268292683"
+      (7.8 / 9.6).send(@method).should == "0.8125"
+      (2.2 / 4.6).send(@method).should == "0.47826086956521746"
+      (0.0 / 1.0).send(@method).should == "0.0"
+      (8.3 / 2.9).send(@method).should == "2.8620689655172415"
+      (3.1 / 6.1).send(@method).should == "0.5081967213114754"
+      (2.8 / 7.8).send(@method).should == "0.358974358974359"
+      (8.0 / 0.1).send(@method).should == "80.0"
+      (1.7 / 6.4).send(@method).should == "0.265625"
+      (1.8 / 5.4).send(@method).should == "0.3333333333333333"
+      (8.0 / 5.8).send(@method).should == "1.3793103448275863"
+      (5.2 / 4.1).send(@method).should == "1.2682926829268295"
+      (9.8 / 5.8).send(@method).should == "1.6896551724137934"
+      (5.4 / 9.5).send(@method).should == "0.5684210526315789"
+      (8.4 / 4.9).send(@method).should == "1.7142857142857142"
+      (1.7 / 3.5).send(@method).should == "0.4857142857142857"
+      (1.2 / 5.1).send(@method).should == "0.23529411764705882"
+      (1.4 / 2.0).send(@method).should == "0.7"
+      (4.8 / 8.0).send(@method).should == "0.6"
+      (9.0 / 2.5).send(@method).should == "3.6"
+      (0.2 / 0.6).send(@method).should == "0.33333333333333337"
+      (7.8 / 5.2).send(@method).should == "1.5"
+      (9.5 / 5.5).send(@method).should == "1.7272727272727273"
+    end
+  end
+
+  describe 'encoding' 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
+      1.23.send(@method).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
+      5.47.send(@method).encoding.should equal(Encoding::US_ASCII)
+    end
+  end
+end
diff --git a/spec/ruby/core/float/to_s_spec.rb b/spec/ruby/core/float/to_s_spec.rb
index ad04bc4fb6..6727a883f8 100644
--- a/spec/ruby/core/float/to_s_spec.rb
+++ b/spec/ruby/core/float/to_s_spec.rb
@@ -1,310 +1,6 @@
 require_relative '../../spec_helper'
+require_relative 'shared/to_s'
 
 describe "Float#to_s" do
-  it "returns 'NaN' for NaN" do
-    nan_value().to_s.should == 'NaN'
-  end
-
-  it "returns 'Infinity' for positive infinity" do
-    infinity_value().to_s.should == 'Infinity'
-  end
-
-  it "returns '-Infinity' for negative infinity" do
-    (-infinity_value()).to_s.should == '-Infinity'
-  end
-
-  it "returns '0.0' for 0.0" do
-    0.0.to_s.should == "0.0"
-  end
-
-  platform_is_not :openbsd do
-    it "emits '-' for -0.0" do
-      -0.0.to_s.should == "-0.0"
-    end
-  end
-
-  it "emits a '-' for negative values" do
-    -3.14.to_s.should == "-3.14"
-  end
-
-  it "emits a trailing '.0' for a whole number" do
-    50.0.to_s.should == "50.0"
-  end
-
-  it "emits a trailing '.0' for the mantissa in e format" do
-    1.0e20.to_s.should == "1.0e+20"
-  end
-
-  it "uses non-e format for a positive value with fractional part having 5 significant figures" do
-    0.0001.to_s.should == "0.0001"
-  end
-
-  it "uses non-e format for a negative value with fractional part having 5 significant figures" do
-    -0.0001.to_s.should == "-0.0001"
-  end
-
-  it "uses e format for a positive value with fractional part having 6 significant figures" do
-    0.00001.to_s.should == "1.0e-05"
-  end
-
-  it "uses e format for a negative value with fractional part having 6 significant figures" do
-    -0.00001.to_s.should == "-1.0e-05"
-  end
-
-  it "uses non-e format for a positive value with whole part having 15 significant figures" do
-    10000000000000.0.to_s.should == "10000000000000.0"
-  end
-
-  it "uses non-e format for a negative value with whole part having 15 significant figures" do
-    -10000000000000.0.to_s.should == "-10000000000000.0"
-  end
-
-  it "uses non-e format for a positive value with whole part having 16 significant figures" do
-    100000000000000.0.to_s.should == "100000000000000.0"
-  end
-
-  it "uses non-e format for a negative value with whole part having 16 significant figures" do
-    -100000000000000.0.to_s.should == "-100000000000000.0"
-  end
-
-  it "uses e format for a positive value with whole part having 18 significant figures" do
-    10000000000000000.0.to_s.should == "1.0e+16"
-  end
-
-  it "uses e format for a negative value with whole part having 18 significant figures" do
-    -10000000000000000.0.to_s.should == "-1.0e+16"
-  end
-
-  it "uses e format for a positive value with whole part having 17 significant figures" do
-    1000000000000000.0.to_s.should == "1.0e+15"
-  end
-
-  it "uses e format for a negative value with whole part having 17 significant figures" do
-    -1000000000000000.0.to_s.should == "-1.0e+15"
-  end
-
-  # #3273
-  it "outputs the minimal, unique form necessary to recreate the value" do
-    value = 0.21611564636388508
-    string = "0.21611564636388508"
-
-    value.to_s.should == string
-    string.to_f.should == value
-  end
-
-  it "outputs the minimal, unique form to represent the value" do
-    0.56.to_s.should == "0.56"
-  end
-
-  describe "matches" do
-    it "random examples in all ranges" do
-      # 50.times do
-      #   bytes = (0...8).map { rand(256) }
-      #   string = bytes.pack('C8')
-      #   float = string.unpack('D').first
-      #   puts "#{'%.20g' % float}.to_s.should == #{float.to_s.inspect}"
-      # end
-
-      2.5540217314354050325e+163.to_s.should == "2.554021731435405e+163"
-      2.5492588360356597544e-172.to_s.should == "2.5492588360356598e-172"
-      1.742770260934704852e-82.to_s.should == "1.7427702609347049e-82"
-      6.2108093676180883209e-104.to_s.should == "6.210809367618088e-104"
-      -3.3448803488331067402e-143.to_s.should == "-3.3448803488331067e-143"
-      -2.2740074343500832557e-168.to_s.should == "-2.2740074343500833e-168"
-      7.0587971678048535732e+191.to_s.should == "7.058797167804854e+191"
-      -284438.88327586348169.to_s.should == "-284438.8832758635"
-      3.953272468476091301e+105.to_s.should == "3.9532724684760913e+105"
-      -3.6361359552959847853e+100.to_s.should == "-3.636135955295985e+100"
-      -1.3222325865575206185e-31.to_s.should == "-1.3222325865575206e-31"
-      1.1440138916932761366e+130.to_s.should == "1.1440138916932761e+130"
-      4.8750891560387561157e-286.to_s.should == "4.875089156038756e-286"
-      5.6101113356591453525e-257.to_s.should == "5.610111335659145e-257"
-      -3.829644279545809575e-100.to_s.should == "-3.8296442795458096e-100"
-      1.5342839401396406117e-194.to_s.should == "1.5342839401396406e-194"
-      2.2284972755169921402e-144.to_s.should == "2.228497275516992e-144"
-      2.1825655917065601737e-61.to_s.should == "2.1825655917065602e-61"
-      -2.6672271363524338322e-62.to_s.should == "-2.667227136352434e-62"
-      -1.9257995160119059415e+21.to_s.should == "-1.925799516011906e+21"
-      -8.9096732962887121718e-198.to_s.should == "-8.909673296288712e-198"
-      2.0202075376548644959e-90.to_s.should == "2.0202075376548645e-90"
-      -7.7341602581786258961e-266.to_s.should == "-7.734160258178626e-266"
-      3.5134482598733635046e+98.to_s.should == "3.5134482598733635e+98"
-      -2.124411722371029134e+154.to_s.should == "-2.124411722371029e+154"
-      -4.573908787355718687e+110.to_s.should == "-4.573908787355719e+110"
-      -1.9344425934170969879e-232.to_s.should == "-1.934442593417097e-232"
-      -1.3274227399979271095e+171.to_s.should == "-1.3274227399979271e+171"
-      9.3495270482104442383e-283.to_s.should == "9.349527048210444e-283"
-      -4.2046059371986483233e+307.to_s.should == "-4.2046059371986483e+307"
-      3.6133547278583543004e-117.to_s.should == "3.613354727858354e-117"
-      4.9247416523566613499e-08.to_s.should == "4.9247416523566613e-08"
-      1.6936145488250064007e-71.to_s.should == "1.6936145488250064e-71"
-      2.4455483206829433098e+96.to_s.should == "2.4455483206829433e+96"
-      7.9797449851436455384e+124.to_s.should == "7.979744985143646e+124"
-      -1.3873689634457876774e-129.to_s.should == "-1.3873689634457877e-129"
-      3.9761102037533483075e+284.to_s.should == "3.976110203753348e+284"
-      -4.2819791952139402486e-303.to_s.should == "-4.28197919521394e-303"
-      -5.7981017546689831298e-116.to_s.should == "-5.798101754668983e-116"
-      -3.953266497860534199e-28.to_s.should == "-3.953266497860534e-28"
-      -2.0659852720290440959e-243.to_s.should == "-2.065985272029044e-243"
-      8.9670488995878688018e-05.to_s.should == "8.967048899587869e-05"
-      -1.2317943708113061768e-98.to_s.should == "-1.2317943708113062e-98"
-      -3.8930768307633080463e+248.to_s.should == "-3.893076830763308e+248"
-      6.5854032671803925627e-239.to_s.should == "6.5854032671803926e-239"
-      4.6257022188980878952e+177.to_s.should == "4.625702218898088e+177"
-      -1.9397155125507235603e-187.to_s.should == "-1.9397155125507236e-187"
-      8.5752156951245705056e+117.to_s.should == "8.57521569512457e+117"
-      -2.4784875958162501671e-132.to_s.should == "-2.4784875958162502e-132"
-      -4.4125691841230058457e-203.to_s.should == "-4.412569184123006e-203"
-    end
-
-    it "random examples in human ranges" do
-      # 50.times do
-      #   formatted = ''
-      #   rand(1..3).times do
-      #     formatted << rand(10).to_s
-      #   end
-      #   formatted << '.'
-      #   rand(1..9).times do
-      #     formatted << rand(10).to_s
-      #   end
-      #   float = formatted.to_f
-      #   puts "#{'%.20f' % float}.to_s.should == #{float.to_s.inspect}"
-      # end
-
-      5.17869899999999994122.to_s.should == "5.178699"
-      905.62695729999995819526.to_s.should == "905.6269573"
-      62.75999999999999801048.to_s.should == "62.76"
-      6.93856795800000014651.to_s.should == "6.938567958"
-      4.95999999999999996447.to_s.should == "4.96"
-      32.77993899999999882766.to_s.should == "32.779939"
-      544.12756779999995160324.to_s.should == "544.1275678"
-      66.25801119999999855281.to_s.should == "66.2580112"
-      7.90000000000000035527.to_s.should == "7.9"
-      5.93100000000000004974.to_s.should == "5.931"
-      5.21229313600000043749.to_s.should == "5.212293136"
-      503.44173809000000119340.to_s.should == "503.44173809"
-      79.26000000000000511591.to_s.should == "79.26"
-      8.51524999999999998579.to_s.should == "8.51525"
-      174.00000000000000000000.to_s.should == "174.0"
-      50.39580000000000126192.to_s.should == "50.3958"
-      35.28999999999999914735.to_s.should == "35.29"
-      5.43136675399999990788.to_s.should == "5.431366754"
-      654.07680000000004838512.to_s.should == "654.0768"
-      6.07423700000000010846.to_s.should == "6.074237"
-      102.25779799999999397642.to_s.should == "102.257798"
-      5.08129999999999970584.to_s.should == "5.0813"
-      6.00000000000000000000.to_s.should == "6.0"
-      8.30000000000000071054.to_s.should == "8.3"
-      32.68345999999999662577.to_s.should == "32.68346"
-      581.11170000000004165486.to_s.should == "581.1117"
-      76.31342999999999676675.to_s.should == "76.31343"
-      438.30826000000001840817.to_s.should == "438.30826"
-      482.06631994000002805478.to_s.should == "482.06631994"
-      55.92721026899999969828.to_s.should == "55.927210269"
-      4.00000000000000000000.to_s.should == "4.0"
-      55.86693999999999959982.to_s.should == "55.86694"
-      787.98299999999994724931.to_s.should == "787.983"
-      5.73810511000000023074.to_s.should == "5.73810511"
-      74.51926810000000500622.to_s.should == "74.5192681"
-      892.89999999999997726263.to_s.should == "892.9"
-      68.27299999999999613465.to_s.should == "68.273"
-      904.10000000000002273737.to_s.should == "904.1"
-      5.23200000000000020606.to_s.should == "5.232"
-      4.09628000000000014325.to_s.should == "4.09628"
-      46.05152633699999853434.to_s.should == "46.051526337"
-      142.12884990599999923688.to_s.should == "142.128849906"
-      3.83057023500000015659.to_s.should == "3.830570235"
-      11.81684594699999912848.to_s.should == "11.816845947"
-      80.50000000000000000000.to_s.should == "80.5"
-      382.18215010000000120272.to_s.should == "382.1821501"
-      55.38444606899999911320.to_s.should == "55.384446069"
-      5.78000000000000024869.to_s.should == "5.78"
-      2.88244999999999995666.to_s.should == "2.88245"
-      43.27709999999999723741.to_s.should == "43.2771"
-    end
-
-    it "random values from divisions" do
-      (1.0 / 7).to_s.should == "0.14285714285714285"
-
-      # 50.times do
-      #    a = rand(10)
-      #    b = rand(10)
-      #    c = rand(10)
-      #    d = rand(10)
-      #    expression = "#{a}.#{b} / #{c}.#{d}"
-      #    puts "      (#{expression}).to_s.should == #{eval(expression).to_s.inspect}"
-      #  end
-
-      (1.1 / 7.1).to_s.should == "0.15492957746478875"
-      (6.5 / 8.8).to_s.should == "0.7386363636363635"
-      (4.8 / 4.3).to_s.should == "1.1162790697674418"
-      (4.0 / 1.9).to_s.should == "2.1052631578947367"
-      (9.1 / 0.8).to_s.should == "11.374999999999998"
-      (5.3 / 7.5).to_s.should == "0.7066666666666667"
-      (2.8 / 1.8).to_s.should == "1.5555555555555554"
-      (2.1 / 2.5).to_s.should == "0.8400000000000001"
-      (3.5 / 6.0).to_s.should == "0.5833333333333334"
-      (4.6 / 0.3).to_s.should == "15.333333333333332"
-      (0.6 / 2.4).to_s.should == "0.25"
-      (1.3 / 9.1).to_s.should == "0.14285714285714288"
-      (0.3 / 5.0).to_s.should == "0.06"
-      (5.0 / 4.2).to_s.should == "1.1904761904761905"
-      (3.0 / 2.0).to_s.should == "1.5"
-      (6.3 / 2.0).to_s.should == "3.15"
-      (5.4 / 6.0).to_s.should == "0.9"
-      (9.6 / 8.1).to_s.should == "1.1851851851851851"
-      (8.7 / 1.6).to_s.should == "5.437499999999999"
-      (1.9 / 7.8).to_s.should == "0.24358974358974358"
-      (0.5 / 2.1).to_s.should == "0.23809523809523808"
-      (9.3 / 5.8).to_s.should == "1.6034482758620692"
-      (2.7 / 8.0).to_s.should == "0.3375"
-      (9.7 / 7.8).to_s.should == "1.2435897435897436"
-      (8.1 / 2.4).to_s.should == "3.375"
-      (7.7 / 2.7).to_s.should == "2.8518518518518516"
-      (7.9 / 1.7).to_s.should == "4.647058823529412"
-      (6.5 / 8.2).to_s.should == "0.7926829268292683"
-      (7.8 / 9.6).to_s.should == "0.8125"
-      (2.2 / 4.6).to_s.should == "0.47826086956521746"
-      (0.0 / 1.0).to_s.should == "0.0"
-      (8.3 / 2.9).to_s.should == "2.8620689655172415"
-      (3.1 / 6.1).to_s.should == "0.5081967213114754"
-      (2.8 / 7.8).to_s.should == "0.358974358974359"
-      (8.0 / 0.1).to_s.should == "80.0"
-      (1.7 / 6.4).to_s.should == "0.265625"
-      (1.8 / 5.4).to_s.should == "0.3333333333333333"
-      (8.0 / 5.8).to_s.should == "1.3793103448275863"
-      (5.2 / 4.1).to_s.should == "1.2682926829268295"
-      (9.8 / 5.8).to_s.should == "1.6896551724137934"
-      (5.4 / 9.5).to_s.should == "0.5684210526315789"
-      (8.4 / 4.9).to_s.should == "1.7142857142857142"
-      (1.7 / 3.5).to_s.should == "0.4857142857142857"
-      (1.2 / 5.1).to_s.should == "0.23529411764705882"
-      (1.4 / 2.0).to_s.should == "0.7"
-      (4.8 / 8.0).to_s.should == "0.6"
-      (9.0 / 2.5).to_s.should == "3.6"
-      (0.2 / 0.6).to_s.should == "0.33333333333333337"
-      (7.8 / 5.2).to_s.should == "1.5"
-      (9.5 / 5.5).to_s.should == "1.7272727272727273"
-    end
-  end
-end
-
-describe "Float#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
-    1.23.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
-    5.47.to_s.encoding.should equal(Encoding::US_ASCII)
-  end
+  it_behaves_like :float_to_s, :to_s
 end
diff --git a/spec/ruby/core/io/puts_spec.rb b/spec/ruby/core/io/puts_spec.rb
index be220c4035..9a708fffef 100644
--- a/spec/ruby/core/io/puts_spec.rb
+++ b/spec/ruby/core/io/puts_spec.rb
@@ -25,7 +25,7 @@ describe "IO#puts" do
   end
 
   it "writes just a newline when given just a newline" do
-    -> { $stdout.puts "\n" }.should output_to_fd("\n", STDOUT)
+    -> { $stdout.puts "\n" }.should output_to_fd("\n", $stdout)
   end
 
   it "writes empty string with a newline when given nil as an arg" do
diff --git a/spec/ruby/core/io/readlines_spec.rb b/spec/ruby/core/io/readlines_spec.rb
index eb99eb8d3a..254f2927b5 100644
--- a/spec/ruby/core/io/readlines_spec.rb
+++ b/spec/ruby/core/io/readlines_spec.rb
@@ -101,31 +101,6 @@ describe "IO#readlines" do
       @io.readlines(obj).should == IOSpecs.lines_r_separator
     end
   end
-
-  describe "when passed a string that starts with a |" do
-    it "gets data from the standard out of the subprocess" do
-      cmd = "|sh -c 'echo hello;echo line2'"
-      platform_is :windows do
-        cmd = "|cmd.exe /C echo hello&echo line2"
-      end
-      lines = IO.readlines(cmd)
-      lines.should == ["hello\n", "line2\n"]
-    end
-
-    platform_is_not :windows do
-      it "gets data from a fork when passed -" do
-        lines = IO.readlines("|-")
-
-        if lines # parent
-          lines.should == ["hello\n", "from a fork\n"]
-        else
-          puts "hello"
-          puts "from a fork"
-          exit!
-        end
-      end
-    end
-  end
 end
 
 describe "IO#readlines" do
@@ -169,6 +144,31 @@ describe "IO.readlines" do
     $_.should == "test"
   end
 
+  describe "when passed a string that starts with a |" do
+    it "gets data from the standard out of the subprocess" do
+      cmd = "|sh -c 'echo hello;echo line2'"
+      platform_is :windows do
+        cmd = "|cmd.exe /C echo hello&echo line2"
+      end
+      lines = IO.readlines(cmd)
+      lines.should == ["hello\n", "line2\n"]
+    end
+
+    platform_is_not :windows do
+      it "gets data from a fork when passed -" do
+        lines = IO.readlines("|-")
+
+        if lines # parent
+          lines.should == ["hello\n", "from a fork\n"]
+        else
+          puts "hello"
+          puts "from a fork"
+          exit!
+        end
+      end
+    end
+  end
+
   it_behaves_like :io_readlines, :readlines
   it_behaves_like :io_readlines_options_19, :readlines
 end
diff --git a/spec/ruby/core/module/autoload_spec.rb b/spec/ruby/core/module/autoload_spec.rb
index 85a0d067d1..5c70e1a217 100644
--- a/spec/ruby/core/module/autoload_spec.rb
+++ b/spec/ruby/core/module/autoload_spec.rb
@@ -210,6 +210,13 @@ describe "Module#autoload" do
     ModuleSpecs::Autoload.use_ex1.should == :good
   end
 
+  it "considers an autoload constant as loaded when autoload is called for/from the current file" do
+    filename = fixture(__FILE__, "autoload_during_require_current_file.rb")
+    require filename
+
+    ScratchPad.recorded.should be_nil
+  end
+
   describe "interacting with defined?" do
     it "does not load the file when referring to the constant in defined?" do
       module ModuleSpecs::Autoload::Dog
diff --git a/spec/ruby/core/module/fixtures/autoload_during_require_current_file.rb b/spec/ruby/core/module/fixtures/autoload_during_require_current_file.rb
new file mode 100644
index 0000000000..5aa8595065
--- /dev/null
+++ b/spec/ruby/core/module/fixtures/autoload_during_require_current_file.rb
@@ -0,0 +1,5 @@
+module ModuleSpecs::Autoload
+  autoload(:AutoloadCurrentFile, __FILE__)
+
+  ScratchPad.record autoload?(:AutoloadCurrentFile)
+end
diff --git a/spec/ruby/core/module/method_added_spec.rb b/spec/ruby/core/module/method_added_spec.rb
index e1b1eda430..b983c8da76 100644
--- a/spec/ruby/core/module/method_added_spec.rb
+++ b/spec/ruby/core/module/method_added_spec.rb
@@ -59,4 +59,25 @@ describe "Module#method_added" do
     end
     m.should_not have_method(:method_to_undef)
   end
+
+  it "is called with a precise caller location with the line of the 'def'" do
+    ScratchPad.record []
+    line = nil
+
+    Module.new do
+      def self.method_added(name)
+        location = caller_locations(1, 1)[0]
+        ScratchPad << location.lineno
+      end
+
+      line = __LINE__
+      def first
+      end
+
+      def second
+      end
+    end
+
+    ScratchPad.recorded.should == [line + 1, line + 4]
+  end
 end
diff --git a/spec/ruby/core/string/unpack/m_spec.rb b/spec/ruby/core/string/unpack/m_spec.rb
index 96841f24cb..21134514a1 100644
--- a/spec/ruby/core/string/unpack/m_spec.rb
+++ b/spec/ruby/core/string/unpack/m_spec.rb
@@ -170,4 +170,18 @@ describe "String#unpack with format 'm'" do
     "".unpack("m").first.encoding.should == Encoding::BINARY
     "Ojs8PT4/QA==\n".unpack("m").first.encoding.should == Encoding::BINARY
   end
+
+  it "does not raise an error for an invalid base64 character" do
+    "dGV%zdA==".unpack("m").should == ["test"]
+  end
+
+  describe "when given count 0" do
+    it "decodes base64" do
+      "dGVzdA==".unpack("m0").should == ["test"]
+    end
+
+    it "raises an ArgumentError for an invalid base64 character" do
+      -> { "dGV%zdA==".unpack("m0") }.should raise_error(ArgumentError)
+    end
+  end
 end
diff --git a/spec/ruby/core/thread/backtrace/location/base_label_spec.rb b/spec/ruby/core/thread/backtrace/location/base_label_spec.rb
index 139a68e2c8..739f62f42f 100644
--- a/spec/ruby/core/thread/backtrace/location/base_label_spec.rb
+++ b/spec/ruby/core/thread/backtrace/location/base_label_spec.rb
@@ -19,4 +19,31 @@ describe 'Thread::Backtrace::Location#base_label' do
       @frame.base_label.should == 'block_location'
     end
   end
+
+  it "is <module:A> for a module body" do
+    module ThreadBacktraceLocationSpecs
+      module ModuleLabel
+        ScratchPad.record caller_locations(0, 1)[0].base_label
+      end
+    end
+    ScratchPad.recorded.should == '<module:ModuleLabel>'
+  end
+
+  it "is <class:A> for a class body" do
+    module ThreadBacktraceLocationSpecs
+      class ClassLabel
+        ScratchPad.record caller_locations(0, 1)[0].base_label
+      end
+    end
+    ScratchPad.recorded.should == '<class:ClassLabel>'
+  end
+
+  it "is 'singleton class' for a singleton class body" do
+    module ThreadBacktraceLocationSpecs
+      class << Object.new
+        ScratchPad.record caller_locations(0, 1)[0].base_label
+      end
+    end
+    ScratchPad.recorded.should =~ /\A(singleton class|<singleton class>)\z/
+  end
 end
diff --git a/spec/ruby/language/BEGIN_spec.rb b/spec/ruby/language/BEGIN_spec.rb
index 58cc2bebfb..5aef5a1d7c 100644
--- a/spec/ruby/language/BEGIN_spec.rb
+++ b/spec/ruby/language/BEGIN_spec.rb
@@ -18,6 +18,11 @@ describe "The BEGIN keyword" do
     -> { eval "1.times { BEGIN { 1 } }" }.should raise_error(SyntaxError)
   end
 
+  it "uses top-level for self" do
+    eval("BEGIN { ScratchPad << self.to_s }", TOPLEVEL_BINDING)
+    ScratchPad.recorded.should == ['main']
+  end
+
   it "runs first in a given code unit" do
     eval "ScratchPad << 'foo'; BEGIN { ScratchPad << 'bar' }"
 
diff --git a/spec/ruby/language/regexp_spec.rb b/spec/ruby/language/regexp_spec.rb
index ac3f773c49..059428ec69 100644
--- a/spec/ruby/language/regexp_spec.rb
+++ b/spec/ruby/language/regexp_spec.rb
@@ -115,6 +115,12 @@ describe "Literal Regexps" do
     /foo.(?<=\d)/.match("fooA foo1").to_a.should == ["foo1"]
   end
 
+  # https://bugs.ruby-lang.org/issues/13671
+  it "raises a RegexpError for lookbehind with specific characters" do
+    r =  Regexp.new("(?<!dss)", Regexp::IGNORECASE)
+    -> { r =~ "✨" }.should raise_error(RegexpError)
+  end
+
   it "supports (?<! ) (negative lookbehind)" do
     /foo.(?<!\d)/.match("foo1 fooA").to_a.should == ["fooA"]
   end
diff --git a/spec/ruby/library/cgi/unescapeHTML_spec.rb b/spec/ruby/library/cgi/unescapeHTML_spec.rb
index 46387d4f01..84b30c6aa6 100644
--- a/spec/ruby/library/cgi/unescapeHTML_spec.rb
+++ b/spec/ruby/library/cgi/unescapeHTML_spec.rb
@@ -36,4 +36,9 @@ describe "CGI.unescapeHTML" do
     input = "fooooooo&#"
     CGI.unescapeHTML(input).should == input
   end
+
+  it "unescapes invalid encoding" do
+    input = "\xFF&"
+    CGI.unescapeHTML(input).should == input
+  end
 end
diff --git a/spec/ruby/library/rbconfig/rbconfig_spec.rb b/spec/ruby/library/rbconfig/rbconfig_spec.rb
index 015c2972b2..b3b8f32edb 100644
--- a/spec/ruby/library/rbconfig/rbconfig_spec.rb
+++ b/spec/ruby/library/rbconfig/rbconfig_spec.rb
@@ -59,16 +59,15 @@ describe 'RbConfig::CONFIG' do
       out.should_not be_empty
     end
 
-    require 'tempfile'
     it "['STRIP'] exists and can be executed" do
       strip = RbConfig::CONFIG.fetch('STRIP')
-      Tempfile.open('sh') do |dst|
-        File.open('/bin/sh', 'rb') do |src|
-          IO.copy_stream(src, dst)
-          dst.flush
-          out =`#{strip} #{dst.to_path}`
-          $?.should.success?
-        end
+      copy = tmp("sh")
+      cp '/bin/sh', copy
+      begin
+        out = `#{strip} #{copy}`
+        $?.should.success?
+      ensure
+        rm_r copy
       end
     end
   end
diff --git a/spec/ruby/library/socket/tcpsocket/gethostbyname_spec.rb b/spec/ruby/library/socket/tcpsocket/gethostbyname_spec.rb
index 703abff81c..f0e98778f5 100644
--- a/spec/ruby/library/socket/tcpsocket/gethostbyname_spec.rb
+++ b/spec/ruby/library/socket/tcpsocket/gethostbyname_spec.rb
@@ -4,7 +4,9 @@ require_relative '../fixtures/classes'
 # TODO: verify these for windows
 describe "TCPSocket#gethostbyname" do
   before :each do
-    @host_info = TCPSocket.gethostbyname(SocketSpecs.hostname)
+    suppress_warning do
+      @host_info = TCPSocket.gethostbyname(SocketSpecs.hostname)
+    end
   end
 
   it "returns an array elements of information on the hostname" do
@@ -52,13 +54,17 @@ end
 
 describe 'TCPSocket#gethostbyname' do
   it 'returns an Array' do
-    TCPSocket.gethostbyname('127.0.0.1').should be_an_instance_of(Array)
+    suppress_warning do
+      TCPSocket.gethostbyname('127.0.0.1').should be_an_instance_of(Array)
+    end
   end
 
   describe 'using a hostname' do
     describe 'the returned Array' do
       before do
-        @array = TCPSocket.gethostbyname('127.0.0.1')
+        suppress_warning do
+          @array = TCPSocket.gethostbyname('127.0.0.1')
+        end
       end
 
       it 'includes the canonical name as the 1st value' do
@@ -88,7 +94,9 @@ describe 'TCPSocket#gethostbyname' do
   SocketSpecs.each_ip_protocol do |family, ip_address|
     describe 'the returned Array' do
       before do
-        @array = TCPSocket.gethostbyname(ip_address)
+        suppress_warning do
+          @array = TCPSocket.gethostbyname(ip_address)
+        end
       end
 
       it 'includes the IP address as the 1st value' do
diff --git a/spec/ruby/optional/capi/ext/regexp_spec.c b/spec/ruby/optional/capi/ext/regexp_spec.c
index 58ab079eff..70780bae2a 100644
--- a/spec/ruby/optional/capi/ext/regexp_spec.c
+++ b/spec/ruby/optional/capi/ext/regexp_spec.c
@@ -35,6 +35,11 @@ VALUE regexp_spec_backref_get(VALUE self) {
   return rb_backref_get();
 }
 
+VALUE regexp_spec_reg_match_backref_get(VALUE self, VALUE re, VALUE str) {
+  rb_reg_match(re, str);
+  return rb_backref_get();
+}
+
 VALUE regexp_spec_match(VALUE self, VALUE regexp, VALUE str) {
   return rb_funcall(regexp, rb_intern("match"), 1, str);
 }
@@ -46,6 +51,7 @@ void Init_regexp_spec(void) {
   rb_define_method(cls, "a_re_1st_match", regexp_spec_reg_1st_match, 1);
   rb_define_method(cls, "rb_reg_match", regexp_spec_reg_match, 2);
   rb_define_method(cls, "rb_backref_get", regexp_spec_backref_get, 0);
+  rb_define_method(cls, "rb_reg_match_backref_get", regexp_spec_reg_match_backref_get, 2);
   rb_define_method(cls, "rb_reg_options", regexp_spec_rb_reg_options, 1);
   rb_define_method(cls, "rb_reg_regcomp", regexp_spec_rb_reg_regcomp, 1);
 }
diff --git a/spec/ruby/optional/capi/regexp_spec.rb b/spec/ruby/optional/capi/regexp_spec.rb
index d99935da57..806157368d 100644
--- a/spec/ruby/optional/capi/regexp_spec.rb
+++ b/spec/ruby/optional/capi/regexp_spec.rb
@@ -75,5 +75,9 @@ describe "C-API Regexp function" do
       md = /c/.match('ab')
       @p.rb_backref_get.should == md
     end
+
+    it "returns MatchData when used with rb_reg_match" do
+       @p.rb_reg_match_backref_get(/a/, 'ab')[0].should == 'a'
+    end
   end
 end