1 files changed, 53 insertions, 0 deletions
diff --git a/spec/ruby/core/io/initialize_spec.rb b/spec/ruby/core/io/initialize_spec.rb
new file mode 100644
index 0000000000..4731257625
--- /dev/null
+++ b/spec/ruby/core/io/initialize_spec.rb
@@ -0,0 +1,53 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+describe "IO#initialize" do
+  before :each do
+    @name = tmp("io_initialize.txt")
+    @io = new_io @name
+    @fd = @io.fileno
+  end
+
+  after :each do
+    @io.close if @io
+    rm_r @name
+  end
+
+  it "reassociates the IO instance with the new descriptor when passed a Fixnum" do
+    fd = new_fd @name, "r:utf-8"
+    @io.send :initialize, fd, 'r'
+    @io.fileno.should == fd
+    # initialize has closed the old descriptor
+    lambda { IO.for_fd(@fd).close }.should raise_error(Errno::EBADF)
+  end
+
+  it "calls #to_int to coerce the object passed as an fd" do
+    obj = mock('fileno')
+    fd = new_fd @name, "r:utf-8"
+    obj.should_receive(:to_int).and_return(fd)
+    @io.send :initialize, obj, 'r'
+    @io.fileno.should == fd
+    # initialize has closed the old descriptor
+    lambda { IO.for_fd(@fd).close }.should raise_error(Errno::EBADF)
+  end
+
+  it "raises a TypeError when passed an IO" do
+    lambda { @io.send :initialize, STDOUT, 'w' }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed nil" do
+    lambda { @io.send :initialize, nil, 'w' }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when passed a String" do
+    lambda { @io.send :initialize, "4", 'w' }.should raise_error(TypeError)
+  end
+
+  it "raises IOError on closed stream" do
+    lambda { @io.send :initialize, IOSpecs.closed_io.fileno }.should raise_error(IOError)
+  end
+
+  it "raises an Errno::EBADF when given an invalid file descriptor" do
+    lambda { @io.send :initialize, -1, 'w' }.should raise_error(Errno::EBADF)
+  end
+end