1 files changed, 49 insertions, 0 deletions
diff --git a/spec/ruby/core/io/binread_spec.rb b/spec/ruby/core/io/binread_spec.rb
new file mode 100644
index 0000000000..b592639f9d
--- /dev/null
+++ b/spec/ruby/core/io/binread_spec.rb
@@ -0,0 +1,49 @@
+# -*- encoding: utf-8 -*-
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "IO.binread" do
+  before :each do
+    @internal = Encoding.default_internal
+
+    @fname = tmp('io_read.txt')
+    @contents = "1234567890"
+    touch(@fname) { |f| f.write @contents }
+  end
+
+  after :each do
+    rm_r @fname
+    Encoding.default_internal = @internal
+  end
+
+  it "reads the contents of a file" do
+    IO.binread(@fname).should == @contents
+  end
+
+  it "reads the contents of a file up to a certain size when specified" do
+    IO.binread(@fname, 5).should == @contents.slice(0..4)
+  end
+
+  it "reads the contents of a file from an offset of a specific size when specified" do
+    IO.binread(@fname, 5, 3).should == @contents.slice(3, 5)
+  end
+
+  it "returns a String in ASCII-8BIT encoding" do
+    IO.binread(@fname).encoding.should == Encoding::ASCII_8BIT
+  end
+
+  it "returns a String in ASCII-8BIT encoding regardless of Encoding.default_internal" do
+    Encoding.default_internal = Encoding::EUC_JP
+    IO.binread(@fname).encoding.should == Encoding::ASCII_8BIT
+  end
+
+  it "raises an ArgumentError when not passed a valid length" do
+    lambda { IO.binread @fname, -1 }.should raise_error(ArgumentError)
+  end
+
+  ruby_version_is "2.3" do # MRI leaks the fd on older versions
+    it "raises an Errno::EINVAL when not passed a valid offset" do
+      lambda { IO.binread @fname, 0, -1  }.should raise_error(Errno::EINVAL)
+    end
+  end
+end