3 files changed, 146 insertions, 1 deletions
diff --git a/spec/ruby/core/string/bytesplice_spec.rb b/spec/ruby/core/string/bytesplice_spec.rb
new file mode 100644
index 0000000000..f13024a79b
--- /dev/null
+++ b/spec/ruby/core/string/bytesplice_spec.rb
@@ -0,0 +1,133 @@
+# -*- encoding: utf-8 -*-
+require_relative '../../spec_helper'
+
+describe "String#bytesplice" do
+  ruby_version_is "3.2" do
+    it "raises IndexError when index is less than -bytesize" do
+      -> { "hello".bytesplice(-6, 0, "xxx") }.should raise_error(IndexError, "index -6 out of string")
+    end
+
+    it "raises IndexError when index is greater than bytesize" do
+      -> { "hello".bytesplice(6, 0, "xxx") }.should raise_error(IndexError, "index 6 out of string")
+    end
+
+    it "raises IndexError for negative length" do
+      -> { "abc".bytesplice(0, -2, "") }.should raise_error(IndexError, "negative length -2")
+    end
+
+    it "replaces with integer indices" do
+      "hello".bytesplice(-5, 0, "xxx").should == "xxxhello"
+      "hello".bytesplice(0, 0, "xxx").should == "xxxhello"
+      "hello".bytesplice(0, 1, "xxx").should == "xxxello"
+      "hello".bytesplice(0, 5, "xxx").should == "xxx"
+      "hello".bytesplice(0, 6, "xxx").should == "xxx"
+    end
+
+    it "raises RangeError when range left boundary is less than -bytesize" do
+      -> { "hello".bytesplice(-6...-6, "xxx") }.should raise_error(RangeError, "-6...-6 out of range")
+    end
+
+    it "replaces with ranges" do
+      "hello".bytesplice(-5...-5, "xxx").should == "xxxhello"
+      "hello".bytesplice(0...0, "xxx").should == "xxxhello"
+      "hello".bytesplice(0..0, "xxx").should == "xxxello"
+      "hello".bytesplice(0...1, "xxx").should == "xxxello"
+      "hello".bytesplice(0..1, "xxx").should == "xxxllo"
+      "hello".bytesplice(0..-1, "xxx").should == "xxx"
+      "hello".bytesplice(0...5, "xxx").should == "xxx"
+      "hello".bytesplice(0...6, "xxx").should == "xxx"
+    end
+
+    it "raises TypeError when integer index is provided without length argument" do
+      -> { "hello".bytesplice(0, "xxx") }.should raise_error(TypeError, "wrong argument type Integer (expected Range)")
+    end
+
+    it "replaces on an empty string" do
+      "".bytesplice(0, 0, "").should == ""
+      "".bytesplice(0, 0, "xxx").should == "xxx"
+    end
+
+    it "mutates self" do
+      s = "hello"
+      s.bytesplice(2, 1, "xxx").should.equal?(s)
+    end
+
+    it "raises when string is frozen" do
+      s = "hello".freeze
+      -> { s.bytesplice(2, 1, "xxx") }.should raise_error(FrozenError, "can't modify frozen String: \"hello\"")
+    end
+  end
+end
+
+describe "String#bytesplice with multibyte characters" do
+  ruby_version_is "3.2" do
+    it "raises IndexError when index is out of byte size boundary" do
+      -> { "こんにちは".bytesplice(-16, 0, "xxx") }.should raise_error(IndexError, "index -16 out of string")
+    end
+
+    it "raises IndexError when index is not on a codepoint boundary" do
+      -> { "こんにちは".bytesplice(1, 0, "xxx") }.should raise_error(IndexError, "offset 1 does not land on character boundary")
+    end
+
+    it "raises IndexError when length is not matching the codepoint boundary" do
+      -> { "こんにちは".bytesplice(0, 1, "xxx") }.should raise_error(IndexError, "offset 1 does not land on character boundary")
+      -> { "こんにちは".bytesplice(0, 2, "xxx") }.should raise_error(IndexError, "offset 2 does not land on character boundary")
+    end
+
+    it "replaces with integer indices" do
+      "こんにちは".bytesplice(-15, 0, "xxx").should == "xxxこんにちは"
+      "こんにちは".bytesplice(0, 0, "xxx").should == "xxxこんにちは"
+      "こんにちは".bytesplice(0, 3, "xxx").should == "xxxんにちは"
+      "こんにちは".bytesplice(3, 3, "はは").should == "こははにちは"
+      "こんにちは".bytesplice(15, 0, "xxx").should == "こんにちはxxx"
+    end
+
+    it "replaces with range" do
+      "こんにちは".bytesplice(-15...-16, "xxx").should == "xxxこんにちは"
+      "こんにちは".bytesplice(0...0, "xxx").should == "xxxこんにちは"
+      "こんにちは".bytesplice(0..2, "xxx").should == "xxxんにちは"
+      "こんにちは".bytesplice(0...3, "xxx").should == "xxxんにちは"
+      "こんにちは".bytesplice(0..5, "xxx").should == "xxxにちは"
+      "こんにちは".bytesplice(0..-1, "xxx").should == "xxx"
+      "こんにちは".bytesplice(0...15, "xxx").should == "xxx"
+      "こんにちは".bytesplice(0...18, "xxx").should == "xxx"
+    end
+
+    it "treats negative length for range as 0" do
+      "こんにちは".bytesplice(0...-100, "xxx").should == "xxxこんにちは"
+      "こんにちは".bytesplice(3...-100, "xxx").should == "こxxxんにちは"
+      "こんにちは".bytesplice(-15...-100, "xxx").should == "xxxこんにちは"
+    end
+
+    it "raises when ranges not match codepoint boundaries" do
+      -> { "こんにちは".bytesplice(0..0, "x") }.should raise_error(IndexError, "offset 1 does not land on character boundary")
+      -> { "こんにちは".bytesplice(0..1, "x") }.should raise_error(IndexError, "offset 2 does not land on character boundary")
+      # Begin is incorrect
+      -> { "こんにちは".bytesplice(-4..-1, "x") }.should raise_error(IndexError, "offset 11 does not land on character boundary")
+      -> { "こんにちは".bytesplice(-5..-1, "x") }.should raise_error(IndexError, "offset 10 does not land on character boundary")
+      # End is incorrect
+      -> { "こんにちは".bytesplice(-3..-2, "x") }.should raise_error(IndexError, "offset 14 does not land on character boundary")
+      -> { "こんにちは".bytesplice(-3..-3, "x") }.should raise_error(IndexError, "offset 13 does not land on character boundary")
+    end
+
+    it "deals with a different encoded argument" do
+      s = "こんにちは"
+      s.encoding.should == Encoding::UTF_8
+      sub = "xxxxxx"
+      sub.force_encoding(Encoding::US_ASCII)
+
+      result = s.bytesplice(0, 3, sub)
+      result.should == "xxxxxxんにちは"
+      result.encoding.should == Encoding::UTF_8
+
+      s = "xxxxxx"
+      s.force_encoding(Encoding::US_ASCII)
+      sub = "こんにちは"
+      sub.encoding.should == Encoding::UTF_8
+
+      result = s.bytesplice(0, 3, sub)
+      result.should == "こんにちはxxx"
+      result.encoding.should == Encoding::UTF_8
+    end
+  end
+end
diff --git a/spec/ruby/core/string/dedup_spec.rb b/spec/ruby/core/string/dedup_spec.rb
index 919d440c51..57d2be2cfd 100644
--- a/spec/ruby/core/string/dedup_spec.rb
+++ b/spec/ruby/core/string/dedup_spec.rb
@@ -2,7 +2,7 @@ require_relative '../../spec_helper'
 require_relative 'shared/dedup'
 
 describe 'String#dedup' do
-  ruby_version_is '3.2'do
+  ruby_version_is '3.2' do
     it_behaves_like :string_dedup, :dedup
   end
 end
diff --git a/spec/ruby/core/string/to_c_spec.rb b/spec/ruby/core/string/to_c_spec.rb
index edc8a4f14f..9d24f1f56c 100644
--- a/spec/ruby/core/string/to_c_spec.rb
+++ b/spec/ruby/core/string/to_c_spec.rb
@@ -38,4 +38,16 @@ describe "String#to_c" do
       '79+4i'.encode("UTF-16").to_c
     }.should raise_error(Encoding::CompatibilityError, "ASCII incompatible encoding: UTF-16")
   end
+
+  ruby_version_is "3.2" do
+    it "treats a sequence of underscores as an end of Complex string" do
+      "5+3_1i".to_c.should == Complex(5, 31)
+      "5+3__1i".to_c.should == Complex(5)
+      "5+3___1i".to_c.should == Complex(5)
+
+      "12_3".to_c.should == Complex(123)
+      "12__3".to_c.should == Complex(12)
+      "12___3".to_c.should == Complex(12)
+    end
+  end
 end