From 1d15d5f08032acf1b7bceacbb450d617ff6e0931 Mon Sep 17 00:00:00 2001
From: eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 20 Sep 2017 20:18:52 +0000
Subject: 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/string/gsub_spec.rb | 696 +++++++++++++++++++++++++++++++++++++
 1 file changed, 696 insertions(+)
 create mode 100644 spec/ruby/core/string/gsub_spec.rb

(limited to 'spec/ruby/core/string/gsub_spec.rb')

diff --git a/spec/ruby/core/string/gsub_spec.rb b/spec/ruby/core/string/gsub_spec.rb
new file mode 100644
index 0000000000..026b037b6c
--- /dev/null
+++ b/spec/ruby/core/string/gsub_spec.rb
@@ -0,0 +1,696 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe :string_gsub_named_capture, shared: true do
+  it "replaces \\k named backreferences with the regexp's corresponding capture" do
+    str = "hello"
+
+    str.gsub(/(?<foo>[aeiou])/, '<\k<foo>>').should == "h<e>ll<o>"
+    str.gsub(/(?<foo>.)/, '\k<foo>\k<foo>').should == "hheelllloo"
+  end
+end
+
+describe "String#gsub with pattern and replacement" do
+  it "inserts the replacement around every character when the pattern collapses" do
+    "hello".gsub(//, ".").should == ".h.e.l.l.o."
+  end
+
+  it "respects unicode when the pattern collapses" do
+    str = "こにちわ"
+    reg = %r!!
+
+    str.gsub(reg, ".").should == ".こ.に.ち.わ."
+  end
+
+  it "doesn't freak out when replacing ^" do
+    "Text\n".gsub(/^/, ' ').should == " Text\n"
+    "Text\nFoo".gsub(/^/, ' ').should == " Text\n Foo"
+  end
+
+  it "returns a copy of self with all occurrences of pattern replaced with replacement" do
+    "hello".gsub(/[aeiou]/, '*').should == "h*ll*"
+
+    str = "hello homely world. hah!"
+    str.gsub(/\Ah\S+\s*/, "huh? ").should == "huh? homely world. hah!"
+
+    str = "¿por qué?"
+    str.gsub(/([a-z\d]*)/, "*").should == "*¿** **é*?*"
+  end
+
+  it "ignores a block if supplied" do
+    "food".gsub(/f/, "g") { "w" }.should == "good"
+  end
+
+  it "supports \\G which matches at the beginning of the remaining (non-matched) string" do
+    str = "hello homely world. hah!"
+    str.gsub(/\Gh\S+\s*/, "huh? ").should == "huh? huh? world. hah!"
+  end
+
+  it "supports /i for ignoring case" do
+    str = "Hello. How happy are you?"
+    str.gsub(/h/i, "j").should == "jello. jow jappy are you?"
+    str.gsub(/H/i, "j").should == "jello. jow jappy are you?"
+  end
+
+  it "doesn't interpret regexp metacharacters if pattern is a string" do
+    "12345".gsub('\d', 'a').should == "12345"
+    '\d'.gsub('\d', 'a').should == "a"
+  end
+
+  it "replaces \\1 sequences with the regexp's corresponding capture" do
+    str = "hello"
+
+    str.gsub(/([aeiou])/, '<\1>').should == "h<e>ll<o>"
+    str.gsub(/(.)/, '\1\1').should == "hheelllloo"
+
+    str.gsub(/.(.?)/, '<\0>(\1)').should == "<he>(e)<ll>(l)<o>()"
+
+    str.gsub(/.(.)+/, '\1').should == "o"
+
+    str = "ABCDEFGHIJKLabcdefghijkl"
+    re = /#{"(.)" * 12}/
+    str.gsub(re, '\1').should == "Aa"
+    str.gsub(re, '\9').should == "Ii"
+    # Only the first 9 captures can be accessed in MRI
+    str.gsub(re, '\10').should == "A0a0"
+  end
+
+  it "treats \\1 sequences without corresponding captures as empty strings" do
+    str = "hello!"
+
+    str.gsub("", '<\1>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub("h", '<\1>').should == "<>ello!"
+
+    str.gsub(//, '<\1>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub(/./, '\1\2\3').should == ""
+    str.gsub(/.(.{20})?/, '\1').should == ""
+  end
+
+  it "replaces \\& and \\0 with the complete match" do
+    str = "hello!"
+
+    str.gsub("", '<\0>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub("", '<\&>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub("he", '<\0>').should == "<he>llo!"
+    str.gsub("he", '<\&>').should == "<he>llo!"
+    str.gsub("l", '<\0>').should == "he<l><l>o!"
+    str.gsub("l", '<\&>').should == "he<l><l>o!"
+
+    str.gsub(//, '<\0>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub(//, '<\&>').should == "<>h<>e<>l<>l<>o<>!<>"
+    str.gsub(/../, '<\0>').should == "<he><ll><o!>"
+    str.gsub(/../, '<\&>').should == "<he><ll><o!>"
+    str.gsub(/(.)./, '<\0>').should == "<he><ll><o!>"
+  end
+
+  it "replaces \\` with everything before the current match" do
+    str = "hello!"
+
+    str.gsub("", '<\`>').should == "<>h<h>e<he>l<hel>l<hell>o<hello>!<hello!>"
+    str.gsub("h", '<\`>').should == "<>ello!"
+    str.gsub("l", '<\`>').should == "he<he><hel>o!"
+    str.gsub("!", '<\`>').should == "hello<hello>"
+
+    str.gsub(//, '<\`>').should == "<>h<h>e<he>l<hel>l<hell>o<hello>!<hello!>"
+    str.gsub(/../, '<\`>').should == "<><he><hell>"
+  end
+
+  it "replaces \\' with everything after the current match" do
+    str = "hello!"
+
+    str.gsub("", '<\\\'>').should == "<hello!>h<ello!>e<llo!>l<lo!>l<o!>o<!>!<>"
+    str.gsub("h", '<\\\'>').should == "<ello!>ello!"
+    str.gsub("ll", '<\\\'>').should == "he<o!>o!"
+    str.gsub("!", '<\\\'>').should == "hello<>"
+
+    str.gsub(//, '<\\\'>').should == "<hello!>h<ello!>e<llo!>l<lo!>l<o!>o<!>!<>"
+    str.gsub(/../, '<\\\'>').should == "<llo!><o!><>"
+  end
+
+  it "replaces \\+ with the last paren that actually matched" do
+    str = "hello!"
+
+    str.gsub(/(.)(.)/, '\+').should == "el!"
+    str.gsub(/(.)(.)+/, '\+').should == "!"
+    str.gsub(/(.)()/, '\+').should == ""
+    str.gsub(/(.)(.{20})?/, '<\+>').should == "<h><e><l><l><o><!>"
+
+    str = "ABCDEFGHIJKLabcdefghijkl"
+    re = /#{"(.)" * 12}/
+    str.gsub(re, '\+').should == "Ll"
+  end
+
+  it "treats \\+ as an empty string if there was no captures" do
+    "hello!".gsub(/./, '\+').should == ""
+  end
+
+  it "maps \\\\ in replacement to \\" do
+    "hello".gsub(/./, '\\\\').should == '\\' * 5
+  end
+
+  it "leaves unknown \\x escapes in replacement untouched" do
+    "hello".gsub(/./, '\\x').should == '\\x' * 5
+    "hello".gsub(/./, '\\y').should == '\\y' * 5
+  end
+
+  it "leaves \\ at the end of replacement untouched" do
+    "hello".gsub(/./, 'hah\\').should == 'hah\\' * 5
+  end
+
+  it_behaves_like :string_gsub_named_capture, :gsub
+
+  it "taints the result if the original string or replacement is tainted" do
+    hello = "hello"
+    hello_t = "hello"
+    a = "a"
+    a_t = "a"
+    empty = ""
+    empty_t = ""
+
+    hello_t.taint; a_t.taint; empty_t.taint
+
+    hello_t.gsub(/./, a).tainted?.should == true
+    hello_t.gsub(/./, empty).tainted?.should == true
+
+    hello.gsub(/./, a_t).tainted?.should == true
+    hello.gsub(/./, empty_t).tainted?.should == true
+    hello.gsub(//, empty_t).tainted?.should == true
+
+    hello.gsub(//.taint, "foo").tainted?.should == false
+  end
+
+  it "handles pattern collapse" do
+    str = "こにちわ"
+    reg = %r!!
+    str.gsub(reg, ".").should == ".こ.に.ち.わ."
+  end
+
+  it "untrusts the result if the original string or replacement is untrusted" do
+    hello = "hello"
+    hello_t = "hello"
+    a = "a"
+    a_t = "a"
+    empty = ""
+    empty_t = ""
+
+    hello_t.untrust; a_t.untrust; empty_t.untrust
+
+    hello_t.gsub(/./, a).untrusted?.should == true
+    hello_t.gsub(/./, empty).untrusted?.should == true
+
+    hello.gsub(/./, a_t).untrusted?.should == true
+    hello.gsub(/./, empty_t).untrusted?.should == true
+    hello.gsub(//, empty_t).untrusted?.should == true
+
+    hello.gsub(//.untrust, "foo").untrusted?.should == false
+  end
+
+  it "tries to convert pattern to a string using to_str" do
+    pattern = mock('.')
+    def pattern.to_str() "." end
+
+    "hello.".gsub(pattern, "!").should == "hello!"
+  end
+
+  it "raises a TypeError when pattern can't be converted to a string" do
+    lambda { "hello".gsub([], "x")            }.should raise_error(TypeError)
+    lambda { "hello".gsub(Object.new, "x")    }.should raise_error(TypeError)
+    lambda { "hello".gsub(nil, "x")           }.should raise_error(TypeError)
+  end
+
+  it "tries to convert replacement to a string using to_str" do
+    replacement = mock('hello_replacement')
+    def replacement.to_str() "hello_replacement" end
+
+    "hello".gsub(/hello/, replacement).should == "hello_replacement"
+  end
+
+  it "raises a TypeError when replacement can't be converted to a string" do
+    lambda { "hello".gsub(/[aeiou]/, [])            }.should raise_error(TypeError)
+    lambda { "hello".gsub(/[aeiou]/, Object.new)    }.should raise_error(TypeError)
+    lambda { "hello".gsub(/[aeiou]/, nil)           }.should raise_error(TypeError)
+  end
+
+  it "returns subclass instances when called on a subclass" do
+    StringSpecs::MyString.new("").gsub(//, "").should be_an_instance_of(StringSpecs::MyString)
+    StringSpecs::MyString.new("").gsub(/foo/, "").should be_an_instance_of(StringSpecs::MyString)
+    StringSpecs::MyString.new("foo").gsub(/foo/, "").should be_an_instance_of(StringSpecs::MyString)
+    StringSpecs::MyString.new("foo").gsub("foo", "").should be_an_instance_of(StringSpecs::MyString)
+  end
+
+  # Note: $~ cannot be tested because mspec messes with it
+
+  it "sets $~ to MatchData of last match and nil when there's none" do
+    'hello.'.gsub('hello', 'x')
+    $~[0].should == 'hello'
+
+    'hello.'.gsub('not', 'x')
+    $~.should == nil
+
+    'hello.'.gsub(/.(.)/, 'x')
+    $~[0].should == 'o.'
+
+    'hello.'.gsub(/not/, 'x')
+    $~.should == nil
+  end
+end
+
+describe "String#gsub with pattern and Hash" do
+  it "returns a copy of self with all occurrences of pattern replaced with the value of the corresponding hash key" do
+    "hello".gsub(/./, 'l' => 'L').should == "LL"
+    "hello!".gsub(/(.)(.)/, 'he' => 'she ', 'll' => 'said').should == 'she said'
+    "hello".gsub('l', 'l' => 'el').should == 'heelelo'
+  end
+
+  it "ignores keys that don't correspond to matches" do
+    "hello".gsub(/./, 'z' => 'L', 'h' => 'b', 'o' => 'ow').should == "bow"
+  end
+
+  it "returns an empty string if the pattern matches but the hash specifies no replacements" do
+    "hello".gsub(/./, 'z' => 'L').should == ""
+  end
+
+  it "ignores non-String keys" do
+    "tattoo".gsub(/(tt)/, 'tt' => 'b', tt: 'z').should == "taboo"
+  end
+
+  it "uses a key's value as many times as needed" do
+    "food".gsub(/o/, 'o' => '0').should == "f00d"
+  end
+
+  it "uses the hash's default value for missing keys" do
+    hsh = {}
+    hsh.default='?'
+    hsh['o'] = '0'
+    "food".gsub(/./, hsh).should == "?00?"
+  end
+
+  it "coerces the hash values with #to_s" do
+    hsh = {}
+    hsh.default=[]
+    hsh['o'] = 0
+    obj = mock('!')
+    obj.should_receive(:to_s).and_return('!')
+    hsh['!'] = obj
+    "food!".gsub(/./, hsh).should == "[]00[]!"
+  end
+
+  it "uses the hash's value set from default_proc for missing keys" do
+    hsh = {}
+    hsh.default_proc = lambda { |k,v| 'lamb' }
+    "food!".gsub(/./, hsh).should == "lamblamblamblamblamb"
+  end
+
+  it "sets $~ to MatchData of last match and nil when there's none for access from outside" do
+    'hello.'.gsub('l', 'l' => 'L')
+    $~.begin(0).should == 3
+    $~[0].should == 'l'
+
+    'hello.'.gsub('not', 'ot' => 'to')
+    $~.should == nil
+
+    'hello.'.gsub(/.(.)/, 'o' => ' hole')
+    $~[0].should == 'o.'
+
+    'hello.'.gsub(/not/, 'z' => 'glark')
+    $~.should == nil
+  end
+
+  it "doesn't interpolate special sequences like \\1 for the block's return value" do
+    repl = '\& \0 \1 \` \\\' \+ \\\\ foo'
+    "hello".gsub(/(.+)/, 'hello' => repl ).should == repl
+  end
+
+  it "untrusts the result if the original string is untrusted" do
+    str = "Ghana".untrust
+    str.gsub(/[Aa]na/, 'ana' => '').untrusted?.should be_true
+  end
+
+  it "untrusts the result if a hash value is untrusted" do
+    str = "Ghana"
+    str.gsub(/a$/, 'a' => 'di'.untrust).untrusted?.should be_true
+  end
+
+  it "taints the result if the original string is tainted" do
+    str = "Ghana".taint
+    str.gsub(/[Aa]na/, 'ana' => '').tainted?.should be_true
+  end
+
+  it "taints the result if a hash value is tainted" do
+    str = "Ghana"
+    str.gsub(/a$/, 'a' => 'di'.taint).tainted?.should be_true
+  end
+
+end
+
+describe "String#gsub! with pattern and Hash" do
+
+  it "returns self with all occurrences of pattern replaced with the value of the corresponding hash key" do
+    "hello".gsub!(/./, 'l' => 'L').should == "LL"
+    "hello!".gsub!(/(.)(.)/, 'he' => 'she ', 'll' => 'said').should == 'she said'
+    "hello".gsub!('l', 'l' => 'el').should == 'heelelo'
+  end
+
+  it "ignores keys that don't correspond to matches" do
+    "hello".gsub!(/./, 'z' => 'L', 'h' => 'b', 'o' => 'ow').should == "bow"
+  end
+
+  it "replaces self with an empty string if the pattern matches but the hash specifies no replacements" do
+    "hello".gsub!(/./, 'z' => 'L').should == ""
+  end
+
+  it "ignores non-String keys" do
+    "hello".gsub!(/(ll)/, 'll' => 'r', ll: 'z').should == "hero"
+  end
+
+  it "uses a key's value as many times as needed" do
+    "food".gsub!(/o/, 'o' => '0').should == "f00d"
+  end
+
+  it "uses the hash's default value for missing keys" do
+    hsh = {}
+    hsh.default='?'
+    hsh['o'] = '0'
+    "food".gsub!(/./, hsh).should == "?00?"
+  end
+
+  it "coerces the hash values with #to_s" do
+    hsh = {}
+    hsh.default=[]
+    hsh['o'] = 0
+    obj = mock('!')
+    obj.should_receive(:to_s).and_return('!')
+    hsh['!'] = obj
+    "food!".gsub!(/./, hsh).should == "[]00[]!"
+  end
+
+  it "uses the hash's value set from default_proc for missing keys" do
+    hsh = {}
+    hsh.default_proc = lambda { |k,v| 'lamb' }
+    "food!".gsub!(/./, hsh).should == "lamblamblamblamblamb"
+  end
+
+  it "sets $~ to MatchData of last match and nil when there's none for access from outside" do
+    'hello.'.gsub!('l', 'l' => 'L')
+    $~.begin(0).should == 3
+    $~[0].should == 'l'
+
+    'hello.'.gsub!('not', 'ot' => 'to')
+    $~.should == nil
+
+    'hello.'.gsub!(/.(.)/, 'o' => ' hole')
+    $~[0].should == 'o.'
+
+    'hello.'.gsub!(/not/, 'z' => 'glark')
+    $~.should == nil
+  end
+
+  it "doesn't interpolate special sequences like \\1 for the block's return value" do
+    repl = '\& \0 \1 \` \\\' \+ \\\\ foo'
+    "hello".gsub!(/(.+)/, 'hello' => repl ).should == repl
+  end
+
+  it "keeps untrusted state" do
+    str = "Ghana".untrust
+    str.gsub!(/[Aa]na/, 'ana' => '').untrusted?.should be_true
+  end
+
+  it "untrusts self if a hash value is untrusted" do
+    str = "Ghana"
+    str.gsub!(/a$/, 'a' => 'di'.untrust).untrusted?.should be_true
+  end
+
+  it "keeps tainted state" do
+    str = "Ghana".taint
+    str.gsub!(/[Aa]na/, 'ana' => '').tainted?.should be_true
+  end
+
+  it "taints self if a hash value is tainted" do
+    str = "Ghana"
+    str.gsub!(/a$/, 'a' => 'di'.taint).tainted?.should be_true
+  end
+
+end
+
+describe "String#gsub with pattern and block" do
+  it "returns a copy of self with all occurrences of pattern replaced with the block's return value" do
+    "hello".gsub(/./) { |s| s.succ + ' ' }.should == "i f m m p "
+    "hello!".gsub(/(.)(.)/) { |*a| a.inspect }.should == '["he"]["ll"]["o!"]'
+    "hello".gsub('l') { 'x'}.should == 'hexxo'
+  end
+
+  it "sets $~ for access from the block" do
+    str = "hello"
+    str.gsub(/([aeiou])/) { "<#{$~[1]}>" }.should == "h<e>ll<o>"
+    str.gsub(/([aeiou])/) { "<#{$1}>" }.should == "h<e>ll<o>"
+    str.gsub("l") { "<#{$~[0]}>" }.should == "he<l><l>o"
+
+    offsets = []
+
+    str.gsub(/([aeiou])/) do
+      md = $~
+      md.string.should == str
+      offsets << md.offset(0)
+      str
+    end.should == "hhellollhello"
+
+    offsets.should == [[1, 2], [4, 5]]
+  end
+
+  it "restores $~ after leaving the block" do
+    [/./, "l"].each do |pattern|
+      old_md = nil
+      "hello".gsub(pattern) do
+        old_md = $~
+        "ok".match(/./)
+        "x"
+      end
+
+      $~[0].should == old_md[0]
+      $~.string.should == "hello"
+    end
+  end
+
+  it "sets $~ to MatchData of last match and nil when there's none for access from outside" do
+    'hello.'.gsub('l') { 'x' }
+    $~.begin(0).should == 3
+    $~[0].should == 'l'
+
+    'hello.'.gsub('not') { 'x' }
+    $~.should == nil
+
+    'hello.'.gsub(/.(.)/) { 'x' }
+    $~[0].should == 'o.'
+
+    'hello.'.gsub(/not/) { 'x' }
+    $~.should == nil
+  end
+
+  it "doesn't interpolate special sequences like \\1 for the block's return value" do
+    repl = '\& \0 \1 \` \\\' \+ \\\\ foo'
+    "hello".gsub(/(.+)/) { repl }.should == repl
+  end
+
+  it "converts the block's return value to a string using to_s" do
+    replacement = mock('hello_replacement')
+    def replacement.to_s() "hello_replacement" end
+
+    "hello".gsub(/hello/) { replacement }.should == "hello_replacement"
+
+    obj = mock('ok')
+    def obj.to_s() "ok" end
+
+    "hello".gsub(/.+/) { obj }.should == "ok"
+  end
+
+  it "untrusts the result if the original string or replacement is untrusted" do
+    hello = "hello"
+    hello_t = "hello"
+    a = "a"
+    a_t = "a"
+    empty = ""
+    empty_t = ""
+
+    hello_t.untrust; a_t.untrust; empty_t.untrust
+
+    hello_t.gsub(/./) { a }.untrusted?.should == true
+    hello_t.gsub(/./) { empty }.untrusted?.should == true
+
+    hello.gsub(/./) { a_t }.untrusted?.should == true
+    hello.gsub(/./) { empty_t }.untrusted?.should == true
+    hello.gsub(//) { empty_t }.untrusted?.should == true
+
+    hello.gsub(//.untrust) { "foo" }.untrusted?.should == false
+  end
+
+  it "uses the compatible encoding if they are compatible" do
+    s  = "hello"
+    s2 = "#{195.chr}#{192.chr}#{195.chr}"
+
+    s.gsub(/l/) { |bar| 195.chr }.encoding.should == Encoding::ASCII_8BIT
+    s2.gsub("#{192.chr}") { |bar| "hello" }.encoding.should == Encoding::ASCII_8BIT
+  end
+
+  it "raises an Encoding::CompatibilityError if the encodings are not compatible" do
+    s = "hllëllo"
+    s2 = "hellö"
+
+    lambda { s.gsub(/l/) { |bar| "Русский".force_encoding("iso-8859-5") } }.should raise_error(Encoding::CompatibilityError)
+    lambda { s2.gsub(/l/) { |bar| "Русский".force_encoding("iso-8859-5") } }.should raise_error(Encoding::CompatibilityError)
+  end
+
+  it "replaces the incompatible part properly even if the encodings are not compatible" do
+    s = "hllëllo"
+
+    s.gsub(/ë/) { |bar| "Русский".force_encoding("iso-8859-5") }.encoding.should == Encoding::ISO_8859_5
+  end
+
+  not_supported_on :opal do
+    it "raises an ArgumentError if encoding is not valid" do
+      x92 = [0x92].pack('C').force_encoding('utf-8')
+      lambda { "a#{x92}b".gsub(/[^\x00-\x7f]/u, '') }.should raise_error(ArgumentError)
+    end
+  end
+end
+
+describe "String#gsub with pattern and without replacement and block" do
+  it "returns an enumerator" do
+    enum = "abca".gsub(/a/)
+    enum.should be_an_instance_of(Enumerator)
+    enum.to_a.should == ["a", "a"]
+  end
+
+  describe "returned Enumerator" do
+    describe "size" do
+      it "should return nil" do
+        "abca".gsub(/a/).size.should == nil
+      end
+    end
+  end
+end
+
+describe "String#gsub! with pattern and replacement" do
+  it "modifies self in place and returns self" do
+    a = "hello"
+    a.gsub!(/[aeiou]/, '*').should equal(a)
+    a.should == "h*ll*"
+  end
+
+  it "modifies self in place with multi-byte characters and returns self" do
+    a = "¿por qué?"
+    a.gsub!(/([a-z\d]*)/, "*").should equal(a)
+    a.should == "*¿** **é*?*"
+  end
+
+  it "taints self if replacement is tainted" do
+    a = "hello"
+    a.gsub!(/./.taint, "foo").tainted?.should == false
+    a.gsub!(/./, "foo".taint).tainted?.should == true
+  end
+
+  it "untrusts self if replacement is untrusted" do
+    a = "hello"
+    a.gsub!(/./.untrust, "foo").untrusted?.should == false
+    a.gsub!(/./, "foo".untrust).untrusted?.should == true
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "hello"
+    a.gsub!(/z/, '*').should == nil
+    a.gsub!(/z/, 'z').should == nil
+    a.should == "hello"
+  end
+
+  # See [ruby-core:23666]
+  it "raises a RuntimeError when self is frozen" do
+    s = "hello"
+    s.freeze
+
+    lambda { s.gsub!(/ROAR/, "x")    }.should raise_error(RuntimeError)
+    lambda { s.gsub!(/e/, "e")       }.should raise_error(RuntimeError)
+    lambda { s.gsub!(/[aeiou]/, '*') }.should raise_error(RuntimeError)
+  end
+end
+
+describe "String#gsub! with pattern and block" do
+  it "modifies self in place and returns self" do
+    a = "hello"
+    a.gsub!(/[aeiou]/) { '*' }.should equal(a)
+    a.should == "h*ll*"
+  end
+
+  it "taints self if block's result is tainted" do
+    a = "hello"
+    a.gsub!(/./.taint) { "foo" }.tainted?.should == false
+    a.gsub!(/./) { "foo".taint }.tainted?.should == true
+  end
+
+  it "untrusts self if block's result is untrusted" do
+    a = "hello"
+    a.gsub!(/./.untrust) { "foo" }.untrusted?.should == false
+    a.gsub!(/./) { "foo".untrust }.untrusted?.should == true
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "hello"
+    a.gsub!(/z/) { '*' }.should == nil
+    a.gsub!(/z/) { 'z' }.should == nil
+    a.should == "hello"
+  end
+
+  # See [ruby-core:23663]
+  it "raises a RuntimeError when self is frozen" do
+    s = "hello"
+    s.freeze
+
+    lambda { s.gsub!(/ROAR/)    { "x" } }.should raise_error(RuntimeError)
+    lambda { s.gsub!(/e/)       { "e" } }.should raise_error(RuntimeError)
+    lambda { s.gsub!(/[aeiou]/) { '*' } }.should raise_error(RuntimeError)
+  end
+
+  it "uses the compatible encoding if they are compatible" do
+    s  = "hello"
+    s2 = "#{195.chr}#{192.chr}#{195.chr}"
+
+    s.gsub!(/l/) { |bar| 195.chr }.encoding.should == Encoding::ASCII_8BIT
+    s2.gsub!("#{192.chr}") { |bar| "hello" }.encoding.should == Encoding::ASCII_8BIT
+  end
+
+  it "raises an Encoding::CompatibilityError if the encodings are not compatible" do
+    s = "hllëllo"
+    s2 = "hellö"
+
+    lambda { s.gsub!(/l/) { |bar| "Русский".force_encoding("iso-8859-5") } }.should raise_error(Encoding::CompatibilityError)
+    lambda { s2.gsub!(/l/) { |bar| "Русский".force_encoding("iso-8859-5") } }.should raise_error(Encoding::CompatibilityError)
+  end
+
+  it "replaces the incompatible part properly even if the encodings are not compatible" do
+    s = "hllëllo"
+
+    s.gsub!(/ë/) { |bar| "Русский".force_encoding("iso-8859-5") }.encoding.should == Encoding::ISO_8859_5
+  end
+
+  not_supported_on :opal do
+    it "raises an ArgumentError if encoding is not valid" do
+      x92 = [0x92].pack('C').force_encoding('utf-8')
+      lambda { "a#{x92}b".gsub!(/[^\x00-\x7f]/u, '') }.should raise_error(ArgumentError)
+    end
+  end
+end
+
+describe "String#gsub! with pattern and without replacement and block" do
+  it "returns an enumerator" do
+    enum = "abca".gsub!(/a/)
+    enum.should be_an_instance_of(Enumerator)
+    enum.to_a.should == ["a", "a"]
+  end
+
+  describe "returned Enumerator" do
+    describe "size" do
+      it "should return nil" do
+        "abca".gsub!(/a/).size.should == nil
+      end
+    end
+  end
+end
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