1 files changed, 12 insertions, 56 deletions
diff --git a/spec/ruby/library/stringio/shared/write.rb b/spec/ruby/library/stringio/shared/write.rb
index aa67bb73c7..080729217b 100644
--- a/spec/ruby/library/stringio/shared/write.rb
+++ b/spec/ruby/library/stringio/shared/write.rb
@@ -45,62 +45,18 @@ describe :stringio_write_string, shared: true do
     @io.pos.should eql(4)
   end
 
-  it "handles concurrent writes correctly" do
-    @io = StringIO.new
-    n = 8
-    go = false
-    threads = n.times.map { |i|
-      Thread.new {
-        Thread.pass until go
-        @io.write i.to_s
-      }
-    }
-    go = true
-    threads.each(&:join)
-    @io.string.size.should == n.times.map(&:to_s).join.size
-  end
-
-  it "handles writing non-ASCII UTF-8 after seek" do
-    @io.binmode
-    @io << "\x80"
-    @io.pos = 0
-    @io << "\x81"
-    @io.string.should == "\x812345".b
-  end
-
-  it "handles writing with position < buffer size" do
-    @io.pos = 2
-    @io.write "abc"
-    @io.string.should == "12abc"
-
-    @io.pos = 2
-    @io.write "de"
-    @io.string.should == "12dec"
-
-    @io.pos = 2
-    @io.write "fghi"
-    @io.string.should == "12fghi"
-  end
-
-  it "transcodes the given string when the external encoding is set and neither is BINARY" do
-    utf8_str = "hello"
-    io = StringIO.new.set_encoding(Encoding::UTF_16BE)
-    io.external_encoding.should == Encoding::UTF_16BE
-
-    io.send(@method, utf8_str)
-
-    expected = [0, 104, 0, 101, 0, 108, 0, 108, 0, 111] # UTF-16BE bytes for "hello"
-    io.string.bytes.should == expected
-  end
-
-  it "does not transcode the given string when the external encoding is set and the string encoding is BINARY" do
-    str = "été".b
-    io = StringIO.new.set_encoding(Encoding::UTF_16BE)
-    io.external_encoding.should == Encoding::UTF_16BE
-
-    io.send(@method, str)
-
-    io.string.bytes.should == str.bytes
+  ruby_version_is ""..."2.7" do
+    it "taints self's String when the passed argument is tainted" do
+      @io.send(@method, "test".taint)
+      @io.string.tainted?.should be_true
+    end
+  end
+
+  ruby_version_is ""..."3.0" do
+    it "does not taint self when the passed argument is tainted" do
+      @io.send(@method, "test".taint)
+      @io.tainted?.should be_false
+    end
   end
 end