1 files changed, 31 insertions, 0 deletions
diff --git a/spec/rubyspec/core/argf/shared/pos.rb b/spec/rubyspec/core/argf/shared/pos.rb
new file mode 100644
index 0000000000..f7184f3d7c
--- /dev/null
+++ b/spec/rubyspec/core/argf/shared/pos.rb
@@ -0,0 +1,31 @@
+describe :argf_pos, shared: true do
+  before :each do
+    @file1 = fixture __FILE__, "file1.txt"
+    @file2 = fixture __FILE__, "file2.txt"
+  end
+
+  it "gives the correct position for each read operation" do
+    argf [@file1, @file2] do
+      size1 = File.size(@file1)
+      size2 = File.size(@file2)
+
+      @argf.read(2)
+      @argf.send(@method).should == 2
+      @argf.read(size1-2)
+      @argf.send(@method).should == size1
+      @argf.read(6)
+      @argf.send(@method).should == 6
+      @argf.rewind
+      @argf.send(@method).should == 0
+      @argf.read(size2)
+      @argf.send(@method).should == size2
+    end
+  end
+
+  it "raises an ArgumentError when called on a closed stream" do
+    argf [@file1] do
+      @argf.read
+      lambda { @argf.send(@method) }.should raise_error(ArgumentError)
+    end
+  end
+end