1 files changed, 38 insertions, 0 deletions
diff --git a/spec/ruby/core/argf/pos_spec.rb b/spec/ruby/core/argf/pos_spec.rb
new file mode 100644
index 0000000000..b6e5c3a254
--- /dev/null
+++ b/spec/ruby/core/argf/pos_spec.rb
@@ -0,0 +1,38 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../shared/pos', __FILE__)
+
+describe "ARGF.pos" do
+  it_behaves_like :argf_pos, :pos
+end
+
+describe "ARGF.pos=" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+
+    @file1 = File.readlines @file1_name
+    @file2 = File.readlines @file2_name
+  end
+
+  # NOTE: this test assumes that fixtures files have two lines each
+  it "sets the correct position in files" do
+    argf [@file1_name, @file2_name] do
+      @argf.pos = @file1.first.size
+      @argf.gets.should == @file1.last
+      @argf.pos = 0
+      @argf.gets.should == @file1.first
+
+      # finish reading file1
+      @argf.gets
+
+      @argf.gets
+      @argf.pos = 1
+      @argf.gets.should == @file2.first[1..-1]
+
+      @argf.pos = @file2.first.size + @file2.last.size - 1
+      @argf.gets.should == @file2.last[-1,1]
+      @argf.pos = 1000
+      @argf.read.should == ""
+    end
+  end
+end