1 files changed, 16 insertions, 11 deletions
diff --git a/spec/ruby/core/string/shared/codepoints.rb b/spec/ruby/core/string/shared/codepoints.rb
index 0b2e078e0a..b6abf6a3ff 100644
--- a/spec/ruby/core/string/shared/codepoints.rb
+++ b/spec/ruby/core/string/shared/codepoints.rb
@@ -1,15 +1,15 @@
-# -*- encoding: binary -*-
+# encoding: binary
 describe :string_codepoints, shared: true do
   it "returns self" do
     s = "foo"
     result = s.send(@method) {}
-    result.should equal s
+    result.should.equal? s
   end
 
   it "raises an ArgumentError when self has an invalid encoding and a method is called on the returned Enumerator" do
-    s = "\xDF".force_encoding(Encoding::UTF_8)
-    s.valid_encoding?.should be_false
-    -> { s.send(@method).to_a }.should raise_error(ArgumentError)
+    s = "\xDF".dup.force_encoding(Encoding::UTF_8)
+    s.valid_encoding?.should == false
+    -> { s.send(@method).to_a }.should.raise(ArgumentError)
   end
 
   it "yields each codepoint to the block if one is given" do
@@ -21,14 +21,14 @@ describe :string_codepoints, shared: true do
   end
 
   it "raises an ArgumentError if self's encoding is invalid and a block is given" do
-    s = "\xDF".force_encoding(Encoding::UTF_8)
-    s.valid_encoding?.should be_false
-    -> { s.send(@method) { } }.should raise_error(ArgumentError)
+    s = "\xDF".dup.force_encoding(Encoding::UTF_8)
+    s.valid_encoding?.should == false
+    -> { s.send(@method) { } }.should.raise(ArgumentError)
   end
 
   it "yields codepoints as Integers" do
     "glark\u{20}".send(@method).to_a.each do |codepoint|
-      codepoint.should be_an_instance_of(Integer)
+      codepoint.should.instance_of?(Integer)
     end
   end
 
@@ -49,14 +49,19 @@ describe :string_codepoints, shared: true do
 
   it "round-trips to the original String using Integer#chr" do
     s = "\u{13}\u{7711}\u{1010}"
-    s2 = ""
+    s2 = +""
     s.send(@method) {|n| s2 << n.chr(Encoding::UTF_8)}
     s.should == s2
   end
 
   it "is synonymous with #bytes for Strings which are single-byte optimizable" do
     s = "(){}".encode('ascii')
-    s.ascii_only?.should be_true
+    s.ascii_only?.should == true
     s.send(@method).to_a.should == s.bytes.to_a
   end
+
+  it "returns individual bytes for dummy encodings UTF-16 and UTF-32" do
+    "abcd".dup.force_encoding(Encoding::UTF_16).send(@method).to_a.should == [97, 98, 99, 100]
+    "abcd".dup.force_encoding(Encoding::UTF_32).send(@method).to_a.should == [97, 98, 99, 100]
+  end
 end
diff --git a/spec/ruby/core/argf/argf_spec.rb b/spec/ruby/core/argf/argf_spec.rb
new file mode 100644
index 0000000000..f9468539bb
--- /dev/null
+++ b/spec/ruby/core/argf/argf_spec.rb
@@ -0,0 +1,11 @@
+require_relative '../../spec_helper'
+
+describe "ARGF" do
+  it "is extended by the Enumerable module" do
+    ARGF.should.is_a?(Enumerable)
+  end
+
+  it "is an instance of ARGF.class" do
+    ARGF.should.instance_of?(ARGF.class)
+  end
+end
diff --git a/spec/ruby/core/argf/argv_spec.rb b/spec/ruby/core/argf/argv_spec.rb
new file mode 100644
index 0000000000..77dfe78c21
--- /dev/null
+++ b/spec/ruby/core/argf/argv_spec.rb
@@ -0,0 +1,19 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.argv" do
+  before :each do
+    @file1    = fixture __FILE__, "file1.txt"
+    @file2    = fixture __FILE__, "file2.txt"
+  end
+
+  it "returns ARGV for the initial ARGF" do
+    ARGF.argv.should.equal? ARGV
+  end
+
+  it "returns the remaining arguments to treat" do
+    argf [@file1, @file2] do
+      # @file1 is stored in current file
+      @argf.argv.should == [@file2]
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/binmode_spec.rb b/spec/ruby/core/argf/binmode_spec.rb
new file mode 100644
index 0000000000..5288e3199d
--- /dev/null
+++ b/spec/ruby/core/argf/binmode_spec.rb
@@ -0,0 +1,43 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.binmode" do
+  before :each do
+    @file1    = fixture __FILE__, "file1.txt"
+    @file2    = fixture __FILE__, "file2.txt"
+    @bin_file = fixture __FILE__, "bin_file.txt"
+  end
+
+  it "returns self" do
+    argf [@bin_file] do
+      @argf.binmode.should.equal? @argf
+    end
+  end
+
+  platform_is :windows do
+    it "puts reading into binmode" do
+      argf [@bin_file, @bin_file] do
+        @argf.gets.should == "test\n"
+        @argf.binmode
+        @argf.gets.should == "test\r\n"
+      end
+    end
+
+    it "puts all subsequent streams reading through ARGF into binmode" do
+      argf [@bin_file, @bin_file] do
+        @argf.binmode
+        @argf.gets.should == "test\r\n"
+        @argf.gets.should == "test\r\n"
+      end
+    end
+  end
+
+  it "sets the file's encoding to BINARY" do
+    argf [@bin_file, @file1] do
+      @argf.binmode
+      @argf.should.binmode?
+      @argf.gets.encoding.should == Encoding::BINARY
+      @argf.skip
+      @argf.read.encoding.should == Encoding::BINARY
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/close_spec.rb b/spec/ruby/core/argf/close_spec.rb
new file mode 100644
index 0000000000..8ca7d71dc2
--- /dev/null
+++ b/spec/ruby/core/argf/close_spec.rb
@@ -0,0 +1,35 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.close" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+  end
+
+  it "closes the current open stream" do
+    argf [@file1_name, @file2_name] do
+      io = @argf.to_io
+      @argf.close
+      io.closed?.should == true
+    end
+  end
+
+  it "returns self" do
+    argf [@file1_name, @file2_name] do
+      @argf.close.should.equal?(@argf)
+    end
+  end
+
+  it "doesn't raise an IOError if called on a closed stream" do
+    argf [@file1_name] do
+      -> { @argf.close }.should_not.raise
+      -> { @argf.close }.should_not.raise
+    end
+  end
+end
+
+describe "ARGF.close" do
+  it "does not close STDIN" do
+    ruby_exe("ARGV.replace(['-']); ARGF.close; print ARGF.closed?").should == "false"
+  end
+end
diff --git a/spec/ruby/core/argf/closed_spec.rb b/spec/ruby/core/argf/closed_spec.rb
new file mode 100644
index 0000000000..769381e8c3
--- /dev/null
+++ b/spec/ruby/core/argf/closed_spec.rb
@@ -0,0 +1,18 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.closed?" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+  end
+
+  it "returns true if the current stream has been closed" do
+    argf [@file1_name, @file2_name] do
+      stream = @argf.to_io
+      stream.close
+
+      @argf.closed?.should == true
+      stream.reopen(@argf.filename, 'r')
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/each_byte_spec.rb b/spec/ruby/core/argf/each_byte_spec.rb
new file mode 100644
index 0000000000..d9e4e7fe5b
--- /dev/null
+++ b/spec/ruby/core/argf/each_byte_spec.rb
@@ -0,0 +1,60 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.each_byte" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+
+    @bytes = []
+    File.read(@file1_name).each_byte { |b| @bytes << b }
+    File.read(@file2_name).each_byte { |b| @bytes << b }
+  end
+
+  it "yields each byte of all streams to the passed block" do
+    argf [@file1_name, @file2_name] do
+      bytes = []
+      @argf.each_byte { |b| bytes << b }
+      bytes.should == @bytes
+    end
+  end
+
+  it "returns self when passed a block" do
+    argf [@file1_name, @file2_name] do
+      @argf.each_byte {}.should.equal?(@argf)
+    end
+  end
+
+  it "returns an Enumerator when passed no block" do
+    argf [@file1_name, @file2_name] do
+      enum = @argf.each_byte
+      enum.should.instance_of?(Enumerator)
+
+      bytes = []
+      enum.each { |b| bytes << b }
+      bytes.should == @bytes
+    end
+  end
+
+  describe "when no block is given" do
+    it "returns an Enumerator" do
+      argf [@file1_name, @file2_name] do
+        enum = @argf.each_byte
+        enum.should.instance_of?(Enumerator)
+
+        bytes = []
+        enum.each { |b| bytes << b }
+        bytes.should == @bytes
+      end
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          argf [@file1_name, @file2_name] do
+            @argf.each_byte.size.should == nil
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/each_char_spec.rb b/spec/ruby/core/argf/each_char_spec.rb
new file mode 100644
index 0000000000..62d19b6574
--- /dev/null
+++ b/spec/ruby/core/argf/each_char_spec.rb
@@ -0,0 +1,60 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.each_char" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+
+    @chars = []
+    File.read(@file1_name).each_char { |c| @chars << c }
+    File.read(@file2_name).each_char { |c| @chars << c }
+  end
+
+  it "yields each char of all streams to the passed block" do
+    argf [@file1_name, @file2_name] do
+      chars = []
+      @argf.each_char { |c| chars << c }
+      chars.should == @chars
+    end
+  end
+
+  it "returns self when passed a block" do
+    argf [@file1_name, @file2_name] do
+      @argf.each_char {}.should.equal?(@argf)
+    end
+  end
+
+  it "returns an Enumerator when passed no block" do
+    argf [@file1_name, @file2_name] do
+      enum = @argf.each_char
+      enum.should.instance_of?(Enumerator)
+
+      chars = []
+      enum.each { |c| chars << c }
+      chars.should == @chars
+    end
+  end
+
+  describe "when no block is given" do
+    it "returns an Enumerator" do
+      argf [@file1_name, @file2_name] do
+        enum = @argf.each_char
+        enum.should.instance_of?(Enumerator)
+
+        chars = []
+        enum.each { |c| chars << c }
+        chars.should == @chars
+      end
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          argf [@file1_name, @file2_name] do
+            @argf.each_char.size.should == nil
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/each_codepoint_spec.rb b/spec/ruby/core/argf/each_codepoint_spec.rb
new file mode 100644
index 0000000000..ad55785cba
--- /dev/null
+++ b/spec/ruby/core/argf/each_codepoint_spec.rb
@@ -0,0 +1,60 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.each_codepoint" do
+  before :each do
+    file1_name = fixture __FILE__, "file1.txt"
+    file2_name = fixture __FILE__, "file2.txt"
+    @filenames = [file1_name, file2_name]
+
+    @codepoints = File.read(file1_name).codepoints
+    @codepoints.concat File.read(file2_name).codepoints
+  end
+
+  it "is a public method" do
+    argf @filenames do
+      @argf.public_methods(false).should.include?(:each_codepoint)
+    end
+  end
+
+  it "does not require arguments" do
+    argf @filenames do
+      @argf.method(:each_codepoint).arity.should == 0
+    end
+  end
+
+  it "returns self when passed a block" do
+    argf @filenames do
+      @argf.each_codepoint {}.should.equal?(@argf)
+    end
+  end
+
+  it "returns an Enumerator when passed no block" do
+    argf @filenames do
+      @argf.each_codepoint.should.instance_of?(Enumerator)
+    end
+  end
+
+  it "yields each codepoint of all streams" do
+    argf @filenames do
+      @argf.each_codepoint.to_a.should == @codepoints
+    end
+  end
+
+  describe "when no block is given" do
+    it "returns an Enumerator" do
+      argf @filenames do
+        @argf.each_codepoint.should.instance_of?(Enumerator)
+      end
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          argf @filenames do
+            @argf.each_codepoint.size.should == nil
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/each_line_spec.rb b/spec/ruby/core/argf/each_line_spec.rb
new file mode 100644
index 0000000000..fc4d6433b8
--- /dev/null
+++ b/spec/ruby/core/argf/each_line_spec.rb
@@ -0,0 +1,64 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.each_line" do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @file2_name = fixture __FILE__, "file2.txt"
+
+    @lines  = File.readlines @file1_name
+    @lines += File.readlines @file2_name
+  end
+
+  it "is a public method" do
+    argf [@file1_name, @file2_name] do
+      @argf.public_methods(false).should.include?(:each_line)
+    end
+  end
+
+  it "requires multiple arguments" do
+    argf [@file1_name, @file2_name] do
+      @argf.method(:each_line).arity.should < 0
+    end
+  end
+
+  it "reads each line of files" do
+    argf [@file1_name, @file2_name] do
+      lines = []
+      @argf.each_line { |b| lines << b }
+      lines.should == @lines
+    end
+  end
+
+  it "returns self when passed a block" do
+    argf [@file1_name, @file2_name] do
+      @argf.each_line {}.should.equal?(@argf)
+    end
+  end
+
+  describe "with a separator" do
+    it "yields each separated section of all streams" do
+      argf [@file1_name, @file2_name] do
+        @argf.send(:each_line, '.').to_a.should ==
+          (File.readlines(@file1_name, '.') + File.readlines(@file2_name, '.'))
+      end
+    end
+  end
+
+  describe "when no block is given" do
+    it "returns an Enumerator" do
+      argf [@file1_name, @file2_name] do
+        @argf.each_line.should.instance_of?(Enumerator)
+      end
+    end
+
+    describe "returned Enumerator" do
+      describe "size" do
+        it "should return nil" do
+          argf [@file1_name, @file2_name] do
+            @argf.each_line.size.should == nil
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/each_spec.rb b/spec/ruby/core/argf/each_spec.rb
new file mode 100644
index 0000000000..25f60b31d2
--- /dev/null
+++ b/spec/ruby/core/argf/each_spec.rb
@@ -0,0 +1,7 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.each" do
+  it "is an alias of ARGF.each_line" do
+    ARGF.method(:each).should == ARGF.method(:each_line)
+  end
+end
diff --git a/spec/ruby/core/argf/eof_spec.rb b/spec/ruby/core/argf/eof_spec.rb
new file mode 100644
index 0000000000..940d104d69
--- /dev/null
+++ b/spec/ruby/core/argf/eof_spec.rb
@@ -0,0 +1,32 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.eof" do
+  it "is an alias of ARGF.eof?" do
+    ARGF.method(:eof).should == ARGF.method(:eof?)
+  end
+end
+
+describe "ARGF.eof?" 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
+  it "returns true when reaching the end of a file" do
+    argf [@file1, @file2] do
+      result = []
+      while @argf.gets
+        result << @argf.eof?
+      end
+      result.should == [false, true, false, true]
+    end
+  end
+
+  it "raises IOError when called on a closed stream" do
+    argf [@file1] do
+      @argf.read
+      -> { @argf.eof? }.should.raise(IOError)
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/file_spec.rb b/spec/ruby/core/argf/file_spec.rb
new file mode 100644
index 0000000000..df8552d457
--- /dev/null
+++ b/spec/ruby/core/argf/file_spec.rb
@@ -0,0 +1,21 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.file" 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
+  it "returns the current file object on each file" do
+    argf [@file1, @file2] do
+      result = []
+      # returns first current file even when not yet open
+      result << @argf.file.path
+      result << @argf.file.path while @argf.gets
+      # returns last current file even when closed
+      result << @argf.file.path
+      result.should == [@file1, @file1, @file1, @file2, @file2, @file2]
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/filename_spec.rb b/spec/ruby/core/argf/filename_spec.rb
new file mode 100644
index 0000000000..f4b6e922c6
--- /dev/null
+++ b/spec/ruby/core/argf/filename_spec.rb
@@ -0,0 +1,30 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.filename" 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
+  it "returns the current file name on each file" do
+    argf [@file1, @file2] do
+      result = []
+      # returns first current file even when not yet open
+      result << @argf.filename
+      result << @argf.filename while @argf.gets
+      # returns last current file even when closed
+      result << @argf.filename
+
+      result.map! { |f| File.expand_path(f) }
+      result.should == [@file1, @file1, @file1, @file2, @file2, @file2]
+    end
+  end
+
+  # NOTE: this test assumes that fixtures files have two lines each
+  it "sets the $FILENAME global variable with the current file name on each file" do
+    script = fixture __FILE__, "filename.rb"
+    out = ruby_exe(script, args: [@file1, @file2])
+    out.should == "#{@file1}\n#{@file1}\n#{@file2}\n#{@file2}\n#{@file2}\n"
+  end
+end
diff --git a/spec/ruby/core/argf/fileno_spec.rb b/spec/ruby/core/argf/fileno_spec.rb
new file mode 100644
index 0000000000..99245f043c
--- /dev/null
+++ b/spec/ruby/core/argf/fileno_spec.rb
@@ -0,0 +1,26 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.fileno" 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
+  it "returns the current file number on each file" do
+    argf [@file1, @file2] do
+      result = []
+      # returns first current file even when not yet open
+      result << @argf.fileno while @argf.gets
+      # returns last current file even when closed
+      result.map { |d| d.class }.should == [Integer, Integer, Integer, Integer]
+    end
+  end
+
+  it "raises an ArgumentError when called on a closed stream" do
+    argf [@file1] do
+      @argf.read
+      -> { @argf.fileno }.should.raise(ArgumentError)
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/fixtures/bin_file.txt b/spec/ruby/core/argf/fixtures/bin_file.txt
new file mode 100644
index 0000000000..2545e9037e
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/bin_file.txt
@@ -0,0 +1,2 @@
+test
+test
diff --git a/spec/ruby/core/argf/fixtures/file1.txt b/spec/ruby/core/argf/fixtures/file1.txt
new file mode 100644
index 0000000000..1c89bfbd82
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/file1.txt
@@ -0,0 +1,2 @@
+file1.1
+file1.2
diff --git a/spec/ruby/core/argf/fixtures/file2.txt b/spec/ruby/core/argf/fixtures/file2.txt
new file mode 100644
index 0000000000..62e8dba00b
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/file2.txt
@@ -0,0 +1,2 @@
+line2.1
+line2.2
diff --git a/spec/ruby/core/argf/fixtures/filename.rb b/spec/ruby/core/argf/fixtures/filename.rb
new file mode 100644
index 0000000000..599c97dd57
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/filename.rb
@@ -0,0 +1,3 @@
+puts $FILENAME while ARGF.gets
+# returns last current file even when closed
+puts $FILENAME
diff --git a/spec/ruby/core/argf/fixtures/lineno.rb b/spec/ruby/core/argf/fixtures/lineno.rb
new file mode 100644
index 0000000000..079cc92e8e
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/lineno.rb
@@ -0,0 +1,5 @@
+puts $.
+ARGF.gets
+puts $.
+ARGF.gets
+puts $.
diff --git a/spec/ruby/core/argf/fixtures/rewind.rb b/spec/ruby/core/argf/fixtures/rewind.rb
new file mode 100644
index 0000000000..90a334cd89
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/rewind.rb
@@ -0,0 +1,5 @@
+puts ARGF.lineno
+ARGF.gets
+puts ARGF.lineno
+ARGF.rewind
+puts ARGF.lineno
diff --git a/spec/ruby/core/argf/fixtures/stdin.txt b/spec/ruby/core/argf/fixtures/stdin.txt
new file mode 100644
index 0000000000..063cdcb1d4
--- /dev/null
+++ b/spec/ruby/core/argf/fixtures/stdin.txt
@@ -0,0 +1,2 @@
+stdin.1
+stdin.2
diff --git a/spec/ruby/core/argf/getc_spec.rb b/spec/ruby/core/argf/getc_spec.rb
new file mode 100644
index 0000000000..dc5de9b7df
--- /dev/null
+++ b/spec/ruby/core/argf/getc_spec.rb
@@ -0,0 +1,20 @@
+require_relative '../../spec_helper'
+require_relative 'shared/getc'
+
+describe "ARGF.getc" do
+  it_behaves_like :argf_getc, :getc
+end
+
+describe "ARGF.getc" do
+  before :each do
+    @file1 = fixture __FILE__, "file1.txt"
+    @file2 = fixture __FILE__, "file2.txt"
+  end
+
+  it "returns nil when end of stream reached" do
+    argf [@file1, @file2] do
+      @argf.read
+      @argf.getc.should == nil
+    end
+  end
+end
diff --git a/spec/ruby/core/argf/gets_spec.rb b/spec/ruby/core/argf/gets_spec.rb
new file mode 100644
index 0000000000..cc7673b190
--- /dev/null
+++ b/spec/ruby/core/argf/gets_spec.rb
@@ -0,0 +1,49 @@
+require_relative '../../spec_helper'
+require_relative 'shared/gets'
+
+describe "ARGF.gets" do
+  it_behaves_like :argf_gets, :gets
+end
+
+describe "ARGF.gets" do
+  it_behaves_like :argf_gets_inplace_edit, :gets
+end
+
+describe "ARGF.gets" 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
+
+  it "returns nil when reaching end of files" do
+    argf [@file1_name, @file2_name] do
+      total = @file1.size + @file2.size
+      total.times { @argf.gets }
+      @argf.gets.should == nil
+    end
+  end
+
+  before :each do
+    @external = Encoding.default_external
+    @internal = Encoding.default_internal
+
+    Encoding.default_external = Encoding::UTF_8
+    Encoding.default_internal = nil
+  end
+
+  after :each do
+    Encoding.default_external = @external
+    Encoding.default_internal = @internal
+  end
+
+  it "reads the contents of the file with default encoding" do
+    Encoding.default_external = Encoding::US_ASCII
+    argf [@file1_name, @file2_name] do
+      @argf.gets.encoding.should == Encoding::US_ASCII
+    end
+  end
+
+end
diff --git a/spec/ruby/core/argf/inspect_spec.rb b/spec/ruby/core/argf/inspect_spec.rb
new file mode 100644
index 0000000000..df0e3ba8dc
--- /dev/null
+++ b/spec/ruby/core/argf/inspect_spec.rb
@@ -0,0 +1,7 @@
+require_relative '../../spec_helper'
+
+describe "ARGF.inspect" do
+  it "is an alias of ARGF.to_s" do
+    ARGF.method(:inspect).should == ARGF.method(:to_s)
+  end
+end
diff --git a/spec/ruby/core/argf/lineno_spec.rb b/spec/ruby/core/argf/lineno_spec.rb
new file mode 100644