1 files changed, 58 insertions, 0 deletions
diff --git a/spec/ruby/core/argf/shared/read.rb b/spec/ruby/core/argf/shared/read.rb
new file mode 100644
index 0000000000..fe903983c0
--- /dev/null
+++ b/spec/ruby/core/argf/shared/read.rb
@@ -0,0 +1,58 @@
+describe :argf_read, shared: true do
+  before :each do
+    @file1_name = fixture __FILE__, "file1.txt"
+    @stdin_name = fixture __FILE__, "stdin.txt"
+
+    @file1 = File.read @file1_name
+    @stdin = File.read @stdin_name
+  end
+
+  it "treats second nil argument as no output buffer" do
+    argf [@file1_name] do
+      @argf.send(@method, @file1.size, nil).should == @file1
+    end
+  end
+
+  it "treats second argument as an output buffer" do
+    argf [@file1_name] do
+      buffer = ""
+      @argf.send(@method, @file1.size, buffer)
+      buffer.should == @file1
+    end
+  end
+
+  it "clears output buffer before appending to it" do
+    argf [@file1_name] do
+      buffer = "to be cleared"
+      @argf.send(@method, @file1.size, buffer)
+      buffer.should == @file1
+    end
+  end
+
+  it "reads a number of bytes from the first file" do
+    argf [@file1_name] do
+      @argf.send(@method, 5).should == @file1[0, 5]
+    end
+  end
+
+  it "reads from a single file consecutively" do
+    argf [@file1_name] do
+      @argf.send(@method, 1).should == @file1[0, 1]
+      @argf.send(@method, 2).should == @file1[1, 2]
+      @argf.send(@method, 3).should == @file1[3, 3]
+    end
+  end
+
+  it "reads a number of bytes from stdin" do
+    stdin = ruby_exe("print ARGF.#{@method}(10)", :args => "< #{@stdin_name}")
+    stdin.should == @stdin[0, 10]
+  end
+
+  platform_is_not :windows do
+    it "reads the contents of a special device file" do
+      argf ['/dev/zero'] do
+        @argf.send(@method, 100).should == "\000" * 100
+      end
+    end
+  end
+end