1 files changed, 74 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/append_spec.rb b/spec/ruby/library/stringio/append_spec.rb
new file mode 100644
index 0000000000..c21ba00508
--- /dev/null
+++ b/spec/ruby/library/stringio/append_spec.rb
@@ -0,0 +1,74 @@
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+
+describe "StringIO#<< when passed [Object]" do
+  before :each do
+    @io = StringIO.new(+"example")
+  end
+
+  it "returns self" do
+    (@io << "just testing").should.equal?(@io)
+  end
+
+  it "writes the passed argument onto self" do
+    (@io << "just testing")
+    @io.string.should == "just testing"
+    (@io << " and more testing")
+    @io.string.should == "just testing and more testing"
+  end
+
+  it "writes the passed argument at the current position" do
+    @io.pos = 5
+    @io << "<test>"
+    @io.string.should == "examp<test>"
+  end
+
+  it "pads self with \\000 when the current position is after the end" do
+    @io.pos = 15
+    @io << "just testing"
+    @io.string.should == "example\000\000\000\000\000\000\000\000just testing"
+  end
+
+  it "updates self's position" do
+    @io << "test"
+    @io.pos.should.eql?(4)
+  end
+
+  it "tries to convert the passed argument to a String using #to_s" do
+    obj = mock("to_s")
+    obj.should_receive(:to_s).and_return("Test")
+
+    (@io << obj).string.should == "Testple"
+  end
+end
+
+describe "StringIO#<< when self is not writable" do
+  it "raises an IOError" do
+    io = StringIO.new(+"test", "r")
+    -> { io << "test" }.should.raise(IOError)
+
+    io = StringIO.new(+"test")
+    io.close_write
+    -> { io << "test" }.should.raise(IOError)
+  end
+end
+
+describe "StringIO#<< when in append mode" do
+  before :each do
+    @io = StringIO.new(+"example", "a")
+  end
+
+  it "appends the passed argument to the end of self, ignoring current position" do
+    (@io << ", just testing")
+    @io.string.should == "example, just testing"
+
+    @io.pos = 3
+    (@io << " and more testing")
+    @io.string.should == "example, just testing and more testing"
+  end
+
+  it "correctly updates self's position" do
+    @io << ", testing"
+    @io.pos.should.eql?(16)
+  end
+end