Add corresponding transcoding specs for IO too

Author: eregon

spec/ruby/core/io/shared/write.rb

@@ -97,3 +97,55 @@
     end
   end
 end
+
+describe :io_write_transcode, shared: true do
+  before :each do
+    @transcode_filename = tmp("io_write_transcode")
+  end
+
+  after :each do
+    rm_r @transcode_filename
+  end
+
+  describe "transcoding when UTF-16 encoding is set" do
+    it "accepts a UTF-8-encoded string and transcodes it" do
+      utf8_str = "hello"
+
+      File.open(@transcode_filename, "w", external_encoding: Encoding::UTF_16BE) do |file|
+        file.external_encoding.should == Encoding::UTF_16BE
+        file.send(@method, utf8_str)
+      end
+
+      result = File.binread(@transcode_filename)
+      expected = [0, 104, 0, 101, 0, 108, 0, 108, 0, 111] # double-width "hello"
+
+      result.bytes.should == expected
+    end
+  end
+end
+
+describe :io_write_no_transcode, shared: true do
+  before :each do
+    @transcode_filename = tmp("io_write_no_transcode")
+  end
+
+  after :each do
+    rm_r @transcode_filename
+  end
+
+  describe "transcoding when UTF-16 encoding is set" do
+    it "accepts a UTF-8-encoded string and transcodes it" do
+      utf8_str = "hello"
+
+      File.open(@transcode_filename, "w", external_encoding: Encoding::UTF_16BE) do |file|
+        file.external_encoding.should == Encoding::UTF_16BE
+        file.send(@method, utf8_str)
+      end
+
+      result = File.binread(@transcode_filename)
+      expected = [104, 101, 108, 108, 111] # not transcoded to UTF-16BE
+
+      result.bytes.should == expected
+    end
+  end
+end

spec/ruby/core/io/syswrite_spec.rb

@@ -78,4 +78,5 @@
 
 describe "IO#syswrite" do
   it_behaves_like :io_write, :syswrite
+  it_behaves_like :io_write_no_transcode, :syswrite
 end

spec/ruby/core/io/write_nonblock_spec.rb

@@ -50,6 +50,7 @@
 
   describe "IO#write_nonblock" do
     it_behaves_like :io_write, :write_nonblock
+    it_behaves_like :io_write_no_transcode, :write_nonblock
   end
 end
 

spec/ruby/core/io/write_spec.rb

@@ -220,6 +220,7 @@
 
 describe "IO#write" do
   it_behaves_like :io_write, :write
+  it_behaves_like :io_write_transcode, :write
 
   it "accepts multiple arguments" do
     IO.pipe do |r, w|