1 files changed, 82 insertions, 0 deletions
diff --git a/spec/ruby/core/io/syswrite_spec.rb b/spec/ruby/core/io/syswrite_spec.rb
new file mode 100644
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+++ b/spec/ruby/core/io/syswrite_spec.rb
@@ -0,0 +1,82 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/write'
+
+describe "IO#syswrite on a file" do
+  before :each do
+    @filename = tmp("IO_syswrite_file") + $$.to_s
+    File.open(@filename, "w") do |file|
+      file.syswrite("012345678901234567890123456789")
+    end
+    @file = File.open(@filename, "r+")
+    @readonly_file = File.open(@filename)
+  end
+
+  after :each do
+    @file.close
+    @readonly_file.close
+    rm_r @filename
+  end
+
+  it "writes all of the string's bytes but does not buffer them" do
+    written = @file.syswrite("abcde")
+    written.should == 5
+    File.open(@filename) do |file|
+      file.sysread(10).should == "abcde56789"
+      file.seek(0)
+      @file.fsync
+      file.sysread(10).should == "abcde56789"
+    end
+  end
+
+  it "does not modify the passed argument" do
+    File.open(@filename, "w") do |f|
+      f.set_encoding(Encoding::IBM437)
+      # A character whose codepoint differs between UTF-8 and IBM437
+      f.syswrite("ƒ".freeze)
+    end
+
+    File.binread(@filename).bytes.should == [198, 146]
+  end
+
+  it "warns if called immediately after a buffered IO#write" do
+    @file.write("abcde")
+    -> { @file.syswrite("fghij") }.should complain(/syswrite/)
+  end
+
+  it "does not warn if called after IO#write with intervening IO#sysread" do
+    @file.syswrite("abcde")
+    @file.sysread(5)
+    -> { @file.syswrite("fghij") }.should_not complain
+  end
+
+  it "writes to the actual file position when called after buffered IO#read" do
+    @file.read(5)
+    @file.syswrite("abcde")
+    File.open(@filename) do |file|
+      file.sysread(10).should == "01234abcde"
+    end
+  end
+end
+
+describe "IO#syswrite on a pipe" do
+  it "returns the written bytes if the fd is in nonblock mode and write would block" do
+    require 'io/nonblock'
+    r, w = IO.pipe
+    begin
+      w.nonblock = true
+      larger_than_pipe_capacity = 2 * 1024 * 1024
+      written = w.syswrite("a"*larger_than_pipe_capacity)
+      written.should > 0
+      written.should < larger_than_pipe_capacity
+    ensure
+      w.close
+      r.close
+    end
+  end
+end
+
+describe "IO#syswrite" do
+  it_behaves_like :io_write, :syswrite
+  it_behaves_like :io_write_no_transcode, :syswrite
+end