1 files changed, 145 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/shared/read.rb b/spec/ruby/library/stringio/shared/read.rb
new file mode 100644
index 0000000000..22f76b0fb0
--- /dev/null
+++ b/spec/ruby/library/stringio/shared/read.rb
@@ -0,0 +1,145 @@
+describe :stringio_read, shared: true do
+  before :each do
+    @io = StringIO.new("example")
+  end
+
+  it "returns the passed buffer String" do
+    # Note: Rubinius bug:
+    # @io.send(@method, 7, buffer = +"").should equal(buffer)
+    ret = @io.send(@method, 7, buffer = +"")
+    ret.should equal(buffer)
+  end
+
+  it "reads length bytes and writes them to the buffer String" do
+    @io.send(@method, 7, buffer = +"").should.equal?(buffer)
+    buffer.should == "example"
+  end
+
+  guard -> { StringIO::VERSION < "3.1.2" } do
+    it "does not preserve the encoding of the given buffer" do
+      buffer = ''.encode(Encoding::ISO_8859_1)
+      @io.send(@method, 7, buffer)
+
+      buffer.encoding.should_not == Encoding::ISO_8859_1
+    end
+  end
+
+  guard -> { StringIO::VERSION >= "3.1.2" } do
+    it "preserves the encoding of the given buffer" do
+      buffer = ''.encode(Encoding::ISO_8859_1)
+      @io.send(@method, 7, buffer)
+
+      buffer.encoding.should == Encoding::ISO_8859_1
+    end
+  end
+
+  it "tries to convert the passed buffer Object to a String using #to_str" do
+    obj = mock("to_str")
+    obj.should_receive(:to_str).and_return(buffer = +"")
+
+    @io.send(@method, 7, obj)
+    buffer.should == "example"
+  end
+
+  it "raises a TypeError when the passed buffer Object can't be converted to a String" do
+    -> { @io.send(@method, 7, Object.new) }.should raise_error(TypeError)
+  end
+
+  it "raises a FrozenError error when passed a frozen String as buffer" do
+    -> { @io.send(@method, 7, "".freeze) }.should raise_error(FrozenError)
+  end
+end
+
+describe :stringio_read_length, shared: true do
+  before :each do
+    @io = StringIO.new("example")
+  end
+
+  it "reads length bytes from the current position and returns them" do
+    @io.pos = 3
+    @io.send(@method, 4).should == "mple"
+  end
+
+  it "reads at most the whole content" do
+    @io.send(@method, 999).should == "example"
+  end
+
+  it "correctly updates the position" do
+    @io.send(@method, 3)
+    @io.pos.should eql(3)
+
+    @io.send(@method, 999)
+    @io.pos.should eql(7)
+  end
+
+  it "tries to convert the passed length to an Integer using #to_int" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return(7)
+    @io.send(@method, obj).should == "example"
+  end
+
+  it "raises a TypeError when the passed length can't be converted to an Integer" do
+    -> { @io.send(@method, Object.new) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the passed length is negative" do
+    -> { @io.send(@method, -2) }.should raise_error(ArgumentError)
+  end
+
+  it "returns a binary String" do
+    @io.send(@method, 4).encoding.should == Encoding::BINARY
+  end
+end
+
+describe :stringio_read_no_arguments, shared: true do
+  before :each do
+    @io = StringIO.new(+"example")
+  end
+
+  it "reads the whole content starting from the current position" do
+    @io.send(@method).should == "example"
+
+    @io.pos = 3
+    @io.send(@method).should == "mple"
+  end
+
+  it "correctly updates the current position" do
+    @io.send(@method)
+    @io.pos.should eql(7)
+  end
+
+  it "correctly update the current position in bytes when multi-byte characters are used" do
+    @io.print("example\u03A3") # Overwrite the original string with 8 characters containing 9 bytes.
+    @io.send(@method)
+    @io.pos.should eql(9)
+  end
+end
+
+describe :stringio_read_nil, shared: true do
+  before :each do
+    @io = StringIO.new("example")
+  end
+
+  it "returns the remaining content from the current position" do
+    @io.send(@method, nil).should == "example"
+
+    @io.pos = 4
+    @io.send(@method, nil).should == "ple"
+  end
+
+  it "updates the current position" do
+    @io.send(@method, nil)
+    @io.pos.should eql(7)
+  end
+end
+
+describe :stringio_read_not_readable, shared: true do
+  it "raises an IOError" do
+    io = StringIO.new(+"test", "w")
+    -> { io.send(@method) }.should raise_error(IOError)
+
+    io = StringIO.new("test")
+    io.close_read
+    -> { io.send(@method) }.should raise_error(IOError)
+  end
+end