1 files changed, 185 insertions, 0 deletions
diff --git a/spec/ruby/library/stringio/initialize_spec.rb b/spec/ruby/library/stringio/initialize_spec.rb
new file mode 100644
index 0000000000..8b661a3790
--- /dev/null
+++ b/spec/ruby/library/stringio/initialize_spec.rb
@@ -0,0 +1,185 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'stringio'
+
+describe "StringIO#initialize when passed [Object, mode]" do
+  before :each do
+    @io = StringIO.allocate
+  end
+
+  it "uses the passed Object as the StringIO backend" do
+    @io.send(:initialize, str = "example", "r")
+    @io.string.should equal(str)
+  end
+
+  it "sets the mode based on the passed mode" do
+    io = StringIO.allocate
+    io.send(:initialize, "example", "r")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_true
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "rb")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_true
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "r+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "rb+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "w")
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "wb")
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "w+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "wb+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "a")
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "ab")
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "a+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", "ab+")
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+  end
+
+  it "allows passing the mode as an Integer" do
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::RDONLY)
+    io.closed_read?.should be_false
+    io.closed_write?.should be_true
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::RDWR)
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::WRONLY)
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::WRONLY | IO::TRUNC)
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::RDWR | IO::TRUNC)
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::WRONLY | IO::APPEND)
+    io.closed_read?.should be_true
+    io.closed_write?.should be_false
+
+    io = StringIO.allocate
+    io.send(:initialize, "example", IO::RDWR | IO::APPEND)
+    io.closed_read?.should be_false
+    io.closed_write?.should be_false
+  end
+
+  it "raises a RuntimeError when passed a frozen String in truncate mode as StringIO backend" do
+    io = StringIO.allocate
+    lambda { io.send(:initialize, "example".freeze, IO::TRUNC) }.should raise_error(RuntimeError)
+  end
+
+  it "tries to convert the passed mode to a String using #to_str" do
+    obj = mock('to_str')
+    obj.should_receive(:to_str).and_return("r")
+    @io.send(:initialize, "example", obj)
+
+    @io.closed_read?.should be_false
+    @io.closed_write?.should be_true
+  end
+
+  it "raises an Errno::EACCES error when passed a frozen string with a write-mode" do
+    (str = "example").freeze
+    lambda { @io.send(:initialize, str, "r+") }.should raise_error(Errno::EACCES)
+    lambda { @io.send(:initialize, str, "w") }.should raise_error(Errno::EACCES)
+    lambda { @io.send(:initialize, str, "a") }.should raise_error(Errno::EACCES)
+  end
+end
+
+describe "StringIO#initialize when passed [Object]" do
+  before :each do
+    @io = StringIO.allocate
+  end
+
+  it "uses the passed Object as the StringIO backend" do
+    @io.send(:initialize, str = "example")
+    @io.string.should equal(str)
+  end
+
+  it "sets the mode to read-write" do
+    @io.send(:initialize, "example")
+    @io.closed_read?.should be_false
+    @io.closed_write?.should be_false
+  end
+
+  it "tries to convert the passed Object to a String using #to_str" do
+    obj = mock('to_str')
+    obj.should_receive(:to_str).and_return("example")
+    @io.send(:initialize, obj)
+    @io.string.should == "example"
+  end
+
+  it "automatically sets the mode to read-only when passed a frozen string" do
+    (str = "example").freeze
+    @io.send(:initialize, str)
+    @io.closed_read?.should be_false
+    @io.closed_write?.should be_true
+  end
+end
+
+describe "StringIO#initialize when passed no arguments" do
+  before :each do
+    @io = StringIO.allocate
+  end
+
+  it "is private" do
+    StringIO.should have_private_instance_method(:initialize)
+  end
+
+  it "sets the mode to read-write" do
+    @io.send(:initialize, "example")
+    @io.closed_read?.should be_false
+    @io.closed_write?.should be_false
+  end
+
+  it "uses an empty String as the StringIO backend" do
+    @io.send(:initialize)
+    @io.string.should == ""
+  end
+end