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diff --git a/spec/ruby/core/argf/lineno_spec.rb b/spec/ruby/core/argf/lineno_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "ARGF.lineno" do
+ before :each do
+ @file1 = fixture __FILE__, "file1.txt"
+ @file2 = fixture __FILE__, "file2.txt"
+ end
+
+ # NOTE: this test assumes that fixtures files have two lines each
+ # TODO: break this into four specs
+ it "returns the current line number on each file" do
+ argf [@file1, @file2] do
+ @argf.lineno = 0
+ @argf.gets
+ @argf.lineno.should == 1
+ @argf.gets
+ @argf.lineno.should == 2
+ @argf.gets
+ @argf.lineno.should == 3
+ @argf.gets
+ @argf.lineno.should == 4
+ end
+ end
+
+ it "aliases to $." do
+ script = fixture __FILE__, "lineno.rb"
+ out = ruby_exe(script, args: [@file1, @file2])
+ out.should == "0\n1\n2\n"
+ end
+end