1 files changed, 79 insertions, 0 deletions
diff --git a/spec/ruby/core/io/seek_spec.rb b/spec/ruby/core/io/seek_spec.rb
new file mode 100644
index 0000000000..f7e138cbe9
--- /dev/null
+++ b/spec/ruby/core/io/seek_spec.rb
@@ -0,0 +1,79 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+require File.expand_path('../shared/pos', __FILE__)
+
+describe "IO#seek" do
+  it_behaves_like :io_set_pos, :seek
+end
+
+describe "IO#seek" do
+  before :each do
+    @io = IOSpecs.io_fixture "lines.txt"
+  end
+
+  after :each do
+    @io.close unless @io.closed?
+  end
+
+  it "moves the read position relative to the current position with SEEK_CUR" do
+    lambda { @io.seek(-1) }.should raise_error(Errno::EINVAL)
+    @io.seek(10, IO::SEEK_CUR)
+    @io.readline.should == "igne une.\n"
+    @io.seek(-5, IO::SEEK_CUR)
+    @io.readline.should == "une.\n"
+  end
+
+  it "moves the read position relative to the start with SEEK_SET" do
+    @io.seek(1)
+    @io.pos.should == 1
+    @io.rewind
+    @io.seek(43, IO::SEEK_SET)
+    @io.readline.should == "Aquí está la línea tres.\n"
+    @io.seek(5, IO::SEEK_SET)
+    @io.readline.should == " la ligne une.\n"
+  end
+
+  it "moves the read position relative to the end with SEEK_END" do
+    @io.seek(0, IO::SEEK_END)
+    @io.tell.should == 137
+    @io.seek(-25, IO::SEEK_END)
+    @io.readline.should == "cinco.\n"
+  end
+
+  it "moves the read position and clears EOF with SEEK_SET" do
+    value = @io.read
+    @io.seek(0, IO::SEEK_SET)
+    @io.eof?.should == false
+    value.should == @io.read
+  end
+
+  it "moves the read position and clears EOF with SEEK_CUR" do
+    value = @io.read
+    @io.seek(-1, IO::SEEK_CUR)
+    @io.eof?.should == false
+    value[-1].should == @io.read[0]
+  end
+
+  it "moves the read position and clears EOF with SEEK_END" do
+    value = @io.read
+    @io.seek(-1, IO::SEEK_END)
+    @io.eof?.should == false
+    value[-1].should == @io.read[0]
+  end
+
+  platform_is :darwin do
+    it "supports seek offsets greater than 2^32" do
+      begin
+        zero = File.open('/dev/zero')
+        offset = 2**33
+        zero.seek(offset, File::SEEK_SET)
+        pos = zero.pos
+
+        pos.should == offset
+      ensure
+        zero.close rescue nil
+      end
+    end
+  end
+end