4 files changed, 77 insertions, 0 deletions
diff --git a/spec/ruby/core/string/fixtures/classes.rb b/spec/ruby/core/string/fixtures/classes.rb
new file mode 100644
index 0000000000..26fcd51b5d
--- /dev/null
+++ b/spec/ruby/core/string/fixtures/classes.rb
@@ -0,0 +1,60 @@
+class Object
+  # This helper is defined here rather than in MSpec because
+  # it is only used in #unpack specs.
+  def unpack_format(count=nil, repeat=nil)
+    format = "#{instance_variable_get(:@method)}#{count}"
+    format *= repeat if repeat
+    format.dup # because it may then become tainted
+  end
+end
+
+module StringSpecs
+  class MyString < String; end
+  class MyArray < Array; end
+  class MyRange < Range; end
+
+  class SubString < String
+    attr_reader :special
+
+    def initialize(str=nil)
+      @special = str
+    end
+  end
+
+  class InitializeString < String
+    attr_reader :ivar
+
+    def initialize(other)
+      super
+      @ivar = 1
+    end
+
+    def initialize_copy(other)
+      ScratchPad.record object_id
+    end
+  end
+
+  module StringModule
+    def repr
+      1
+    end
+  end
+
+  class StringWithRaisingConstructor < String
+    def initialize(str)
+      raise ArgumentError.new('constructor was called') unless str == 'silly:string'
+      self.replace(str)
+    end
+  end
+
+  class SpecialVarProcessor
+    def process(match)
+      if $~ != nil
+        str = $~[0]
+      else
+        str = "unset"
+      end
+      "<#{str}>"
+    end
+  end
+end
diff --git a/spec/ruby/core/string/fixtures/freeze_magic_comment.rb b/spec/ruby/core/string/fixtures/freeze_magic_comment.rb
new file mode 100644
index 0000000000..2b87a16328
--- /dev/null
+++ b/spec/ruby/core/string/fixtures/freeze_magic_comment.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+print (+ 'frozen string').frozen? ? 'immutable' : 'mutable'
diff --git a/spec/ruby/core/string/fixtures/iso-8859-9-encoding.rb b/spec/ruby/core/string/fixtures/iso-8859-9-encoding.rb
new file mode 100644
index 0000000000..cfa91dedc3
--- /dev/null
+++ b/spec/ruby/core/string/fixtures/iso-8859-9-encoding.rb
@@ -0,0 +1,9 @@
+# -*- encoding: iso-8859-9 -*-
+module StringSpecs
+  class ISO88599Encoding
+    def source_encoding; __ENCODING__; end
+    def x_escape; [0xDF].pack('C').force_encoding("iso-8859-9"); end
+    def ascii_only; "glark"; end
+    def cedilla; "Þ"; end # S-cedilla
+  end
+end
diff --git a/spec/ruby/core/string/fixtures/to_c.rb b/spec/ruby/core/string/fixtures/to_c.rb
new file mode 100644
index 0000000000..7776933263
--- /dev/null
+++ b/spec/ruby/core/string/fixtures/to_c.rb
@@ -0,0 +1,5 @@
+module StringSpecs
+  def self.to_c_method(string)
+    string.to_c
+  end
+end