Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

45 files changed, 1207 insertions, 0 deletions

diff --git a/spec/ruby/core/exception/args_spec.rb b/spec/ruby/core/exception/args_spec.rb
new file mode 100644
index 0000000000..410e21edfb
--- /dev/null
+++ b/spec/ruby/core/exception/args_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "NoMethodError#args" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/arguments_spec.rb b/spec/ruby/core/exception/arguments_spec.rb
new file mode 100644
index 0000000000..47c4339e2d
--- /dev/null
+++ b/spec/ruby/core/exception/arguments_spec.rb
@@ -0,0 +1,11 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "ArgumentError" do
+  it "is a subclass of StandardError" do
+    StandardError.should be_ancestor_of(ArgumentError)
+  end
+
+  it "gives its own class name as message if it has no message" do
+    ArgumentError.new.message.should == "ArgumentError"
+  end
+end
diff --git a/spec/ruby/core/exception/backtrace_spec.rb b/spec/ruby/core/exception/backtrace_spec.rb
new file mode 100644
index 0000000000..2d115e9b2f
--- /dev/null
+++ b/spec/ruby/core/exception/backtrace_spec.rb
@@ -0,0 +1,68 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#backtrace" do
+  before :each do
+    @backtrace = ExceptionSpecs::Backtrace.backtrace
+  end
+
+  it "returns nil if no backtrace was set" do
+    Exception.new.backtrace.should be_nil
+  end
+
+  it "returns an Array" do
+    @backtrace.should be_an_instance_of(Array)
+  end
+
+  it "sets each element to a String" do
+    @backtrace.each {|l| l.should be_an_instance_of(String)}
+  end
+
+  it "includes the filename of the location where self raised in the first element" do
+    @backtrace.first.should =~ /common\.rb/
+  end
+
+  it "includes the line number of the location where self raised in the first element" do
+    @backtrace.first.should =~ /:7:in /
+  end
+
+  it "includes the name of the method from where self raised in the first element" do
+    @backtrace.first.should =~ /in `backtrace'/
+  end
+
+  it "includes the filename of the location immediately prior to where self raised in the second element" do
+    @backtrace[1].should =~ /backtrace_spec\.rb/
+  end
+
+  it "includes the line number of the location immediately prior to where self raised in the second element" do
+    @backtrace[1].should =~ /:6(:in )?/
+  end
+
+  it "contains lines of the same format for each prior position in the stack" do
+    @backtrace[2..-1].each do |line|
+      # This regexp is deliberately imprecise to account for the need to abstract out
+      # the paths of the included mspec files and the desire to avoid specifying in any
+      # detail what the in `...' portion looks like.
+      line.should =~ /^[^ ]+\:\d+(:in `[^`]+')?$/
+    end
+  end
+
+  it "produces a backtrace for an exception captured using $!" do
+    exception = begin
+      raise
+    rescue RuntimeError
+      $!
+    end
+
+    exception.backtrace.first.should =~ /backtrace_spec/
+  end
+
+  it "returns an Array that can be updated" do
+    begin
+      raise
+    rescue RuntimeError => e
+      e.backtrace.unshift "backtrace first"
+      e.backtrace[0].should == "backtrace first"
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/case_compare_spec.rb b/spec/ruby/core/exception/case_compare_spec.rb
new file mode 100644
index 0000000000..7592564855
--- /dev/null
+++ b/spec/ruby/core/exception/case_compare_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SystemCallError.===" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/cause_spec.rb b/spec/ruby/core/exception/cause_spec.rb
new file mode 100644
index 0000000000..a1aa39ae34
--- /dev/null
+++ b/spec/ruby/core/exception/cause_spec.rb
@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Exception#cause" do
+  it "returns the active exception when an exception is raised" do
+    begin
+      raise Exception, "the cause"
+    rescue Exception
+      begin
+        raise RuntimeError, "the consequence"
+      rescue RuntimeError => e
+        e.should be_an_instance_of(RuntimeError)
+        e.message.should == "the consequence"
+
+        e.cause.should be_an_instance_of(Exception)
+        e.cause.message.should == "the cause"
+      end
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/destination_encoding_name_spec.rb b/spec/ruby/core/exception/destination_encoding_name_spec.rb
new file mode 100644
index 0000000000..d6a01c3220
--- /dev/null
+++ b/spec/ruby/core/exception/destination_encoding_name_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::UndefinedConversionError#destination_encoding_name" do
+  it "needs to be reviewed for spec completeness"
+end
+
+describe "Encoding::InvalidByteSequenceError#destination_encoding_name" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/destination_encoding_spec.rb b/spec/ruby/core/exception/destination_encoding_spec.rb
new file mode 100644
index 0000000000..09064a01f3
--- /dev/null
+++ b/spec/ruby/core/exception/destination_encoding_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::UndefinedConversionError#destination_encoding" do
+  it "needs to be reviewed for spec completeness"
+end
+
+describe "Encoding::InvalidByteSequenceError#destination_encoding" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/equal_value_spec.rb b/spec/ruby/core/exception/equal_value_spec.rb
new file mode 100644
index 0000000000..3aad809377
--- /dev/null
+++ b/spec/ruby/core/exception/equal_value_spec.rb
@@ -0,0 +1,68 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#==" do
+  it "returns true if both exceptions are the same object" do
+    e = ArgumentError.new
+    e.should == e
+  end
+
+  it "returns true if one exception is the dup'd copy of the other" do
+    e = ArgumentError.new
+    e.should == e.dup
+  end
+
+  it "returns true if both exceptions have the same class, no message, and no backtrace" do
+    RuntimeError.new.should == RuntimeError.new
+  end
+
+  it "returns true if both exceptions have the same class, the same message, and no backtrace" do
+    TypeError.new("message").should == TypeError.new("message")
+  end
+
+  it "returns true if both exceptions have the same class, the same message, and the same backtrace" do
+    one = TypeError.new("message")
+    one.set_backtrace [File.dirname(__FILE__)]
+    two = TypeError.new("message")
+    two.set_backtrace [File.dirname(__FILE__)]
+    one.should == two
+  end
+
+  it "returns false if the two exceptions inherit from Exception but have different classes" do
+    one = RuntimeError.new("message")
+    one.set_backtrace [File.dirname(__FILE__)]
+    one.should be_kind_of(Exception)
+    two = TypeError.new("message")
+    two.set_backtrace [File.dirname(__FILE__)]
+    two.should be_kind_of(Exception)
+    one.should_not == two
+  end
+
+  it "returns true if the two objects subclass Exception and have the same message and backtrace" do
+    one = ExceptionSpecs::UnExceptional.new
+    two = ExceptionSpecs::UnExceptional.new
+    one.message.should == two.message
+    two.backtrace.should == two.backtrace
+    one.should == two
+  end
+
+  it "returns false if the argument is not an Exception" do
+    ArgumentError.new.should_not == String.new
+  end
+
+  it "returns false if the two exceptions differ only in their backtrace" do
+    one = RuntimeError.new("message")
+    one.set_backtrace [File.dirname(__FILE__)]
+    two = RuntimeError.new("message")
+    two.set_backtrace nil
+    one.should_not == two
+  end
+
+  it "returns false if the two exceptions differ only in their message" do
+    one = RuntimeError.new("message")
+    one.set_backtrace [File.dirname(__FILE__)]
+    two = RuntimeError.new("message2")
+    two.set_backtrace [File.dirname(__FILE__)]
+    one.should_not == two
+  end
+end
diff --git a/spec/ruby/core/exception/errno_spec.rb b/spec/ruby/core/exception/errno_spec.rb
new file mode 100644
index 0000000000..f7f5b45d8a
--- /dev/null
+++ b/spec/ruby/core/exception/errno_spec.rb
@@ -0,0 +1,48 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "SystemCallError#errno" do
+  it "needs to be reviewed for spec completeness"
+end
+
+describe "Errno::EINVAL.new" do
+  it "can be called with no arguments" do
+    exc = Errno::EINVAL.new
+    exc.should be_an_instance_of(Errno::EINVAL)
+    exc.errno.should == Errno::EINVAL::Errno
+    exc.message.should == "Invalid argument"
+  end
+
+  it "accepts an optional custom message" do
+    exc = Errno::EINVAL.new('custom message')
+    exc.should be_an_instance_of(Errno::EINVAL)
+    exc.errno.should == Errno::EINVAL::Errno
+    exc.message.should == "Invalid argument - custom message"
+  end
+
+  it "accepts an optional custom message and location" do
+    exc = Errno::EINVAL.new('custom message', 'location')
+    exc.should be_an_instance_of(Errno::EINVAL)
+    exc.errno.should == Errno::EINVAL::Errno
+    exc.message.should == "Invalid argument @ location - custom message"
+  end
+end
+
+describe "Errno::EMFILE" do
+  it "can be subclassed" do
+    ExceptionSpecs::EMFILESub = Class.new(Errno::EMFILE)
+    exc = ExceptionSpecs::EMFILESub.new
+    exc.should be_an_instance_of(ExceptionSpecs::EMFILESub)
+  end
+end
+
+describe "Errno::EAGAIN" do
+  # From http://jira.codehaus.org/browse/JRUBY-4747
+  it "is the same class as Errno::EWOULDBLOCK if they represent the same errno value" do
+    if Errno::EAGAIN::Errno == Errno::EWOULDBLOCK::Errno
+      Errno::EAGAIN.should == Errno::EWOULDBLOCK
+    else
+      Errno::EAGAIN.should_not == Errno::EWOULDBLOCK
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/error_bytes_spec.rb b/spec/ruby/core/exception/error_bytes_spec.rb
new file mode 100644
index 0000000000..e5027d0cf3
--- /dev/null
+++ b/spec/ruby/core/exception/error_bytes_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::InvalidByteSequenceError#error_bytes" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/error_char_spec.rb b/spec/ruby/core/exception/error_char_spec.rb
new file mode 100644
index 0000000000..8842424e90
--- /dev/null
+++ b/spec/ruby/core/exception/error_char_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::UndefinedConversionError#error_char" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/exception_spec.rb b/spec/ruby/core/exception/exception_spec.rb
new file mode 100644
index 0000000000..afa482b9d7
--- /dev/null
+++ b/spec/ruby/core/exception/exception_spec.rb
@@ -0,0 +1,83 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+require File.expand_path('../shared/new', __FILE__)
+
+describe "Exception.exception" do
+  it_behaves_like(:exception_new, :exception)
+end
+
+describe "Exception" do
+  it "is a Class" do
+    Exception.should be_kind_of(Class)
+  end
+
+  it "is a superclass of NoMemoryError" do
+    Exception.should be_ancestor_of(NoMemoryError)
+  end
+
+  it "is a superclass of ScriptError" do
+    Exception.should be_ancestor_of(ScriptError)
+  end
+
+  it "is a superclass of SignalException" do
+    Exception.should be_ancestor_of(SignalException)
+  end
+
+  it "is a superclass of Interrupt" do
+    SignalException.should be_ancestor_of(Interrupt)
+  end
+
+  it "is a superclass of StandardError" do
+    Exception.should be_ancestor_of(StandardError)
+  end
+
+  it "is a superclass of SystemExit" do
+    Exception.should be_ancestor_of(SystemExit)
+  end
+
+  it "is a superclass of SystemStackError" do
+    Exception.should be_ancestor_of(SystemStackError)
+  end
+
+  it "is a superclass of SecurityError" do
+    Exception.should be_ancestor_of(SecurityError)
+  end
+
+  it "is a superclass of EncodingError" do
+    Exception.should be_ancestor_of(EncodingError)
+  end
+end
+
+describe "Exception#exception" do
+  it "returns self when passed no argument" do
+    e = RuntimeError.new
+    e.should == e.exception
+  end
+
+  it "returns self when passed self as an argument" do
+    e = RuntimeError.new
+    e.should == e.exception(e)
+  end
+
+  it "returns an exception of the same class as self with the message given as argument" do
+    e = RuntimeError.new
+    e2 = e.exception("message")
+    e2.should be_an_instance_of(RuntimeError)
+    e2.message.should == "message"
+  end
+
+  class CustomArgumentError < StandardError
+    attr_reader :val
+    def initialize(val)
+      @val = val
+    end
+  end
+
+  it "returns an exception of the same class as self with the message given as argument, but without reinitializing" do
+    e = CustomArgumentError.new(:boom)
+    e2 = e.exception("message")
+    e2.should be_an_instance_of(CustomArgumentError)
+    e2.val.should == :boom
+    e2.message.should == "message"
+  end
+end
diff --git a/spec/ruby/core/exception/exit_value_spec.rb b/spec/ruby/core/exception/exit_value_spec.rb
new file mode 100644
index 0000000000..daa5eb0b94
--- /dev/null
+++ b/spec/ruby/core/exception/exit_value_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "LocalJumpError#exit_value" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/fixtures/common.rb b/spec/ruby/core/exception/fixtures/common.rb
new file mode 100644
index 0000000000..51dd0bf9ed
--- /dev/null
+++ b/spec/ruby/core/exception/fixtures/common.rb
@@ -0,0 +1,64 @@
+module ExceptionSpecs
+  class Exceptional < Exception; end
+
+  class Backtrace
+    def self.backtrace
+      begin
+        raise # Do not move this line or update backtrace_spec.rb
+      rescue RuntimeError => e
+        e.backtrace
+      end
+    end
+  end
+
+  class UnExceptional < Exception
+    def backtrace
+      nil
+    end
+    def message
+      nil
+    end
+  end
+
+  class ConstructorException < Exception
+
+    def initialize
+    end
+
+  end
+
+  class OverrideToS < RuntimeError
+    def to_s
+      "this is from #to_s"
+    end
+  end
+
+  class EmptyToS < RuntimeError
+    def to_s
+      ""
+    end
+  end
+end
+
+module NoMethodErrorSpecs
+  class NoMethodErrorA; end
+
+  class NoMethodErrorB; end
+
+  class NoMethodErrorC;
+    protected
+    def a_protected_method;end
+    private
+    def a_private_method; end
+  end
+
+  class NoMethodErrorD; end
+end
+
+class NameErrorSpecs
+  class ReceiverClass
+    def call_undefined_class_variable
+      @@doesnt_exist
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/incomplete_input_spec.rb b/spec/ruby/core/exception/incomplete_input_spec.rb
new file mode 100644
index 0000000000..a64d4be3f3
--- /dev/null
+++ b/spec/ruby/core/exception/incomplete_input_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::InvalidByteSequenceError#incomplete_input?" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/initialize_spec.rb b/spec/ruby/core/exception/initialize_spec.rb
new file mode 100644
index 0000000000..14fb93ef07
--- /dev/null
+++ b/spec/ruby/core/exception/initialize_spec.rb
@@ -0,0 +1 @@
+require File.expand_path('../../../spec_helper', __FILE__)
diff --git a/spec/ruby/core/exception/inspect_spec.rb b/spec/ruby/core/exception/inspect_spec.rb
new file mode 100644
index 0000000000..5b06ffee71
--- /dev/null
+++ b/spec/ruby/core/exception/inspect_spec.rb
@@ -0,0 +1,20 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#inspect" do
+  it "returns '#<Exception: Exception>' when no message given" do
+    Exception.new.inspect.should == "#<Exception: Exception>"
+  end
+
+  it "includes #to_s when the result is non-empty" do
+    ExceptionSpecs::OverrideToS.new.inspect.should == "#<ExceptionSpecs::OverrideToS: this is from #to_s>"
+  end
+
+  it "returns the class name when #to_s returns an empty string" do
+    ExceptionSpecs::EmptyToS.new.inspect.should == "ExceptionSpecs::EmptyToS"
+  end
+
+  it "returns the derived class name with a subclassed Exception" do
+    ExceptionSpecs::UnExceptional.new.inspect.should == "#<ExceptionSpecs::UnExceptional: ExceptionSpecs::UnExceptional>"
+  end
+end
diff --git a/spec/ruby/core/exception/interrupt_spec.rb b/spec/ruby/core/exception/interrupt_spec.rb
new file mode 100644
index 0000000000..ef24743936
--- /dev/null
+++ b/spec/ruby/core/exception/interrupt_spec.rb
@@ -0,0 +1,41 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Interrupt" do
+  it "is a subclass of SignalException" do
+    Interrupt.superclass.should == SignalException
+  end
+end
+
+describe "Interrupt.new" do
+  it "returns an instance of interrupt with no message given" do
+    e = Interrupt.new
+    e.signo.should == Signal.list["INT"]
+    e.signm.should == "Interrupt"
+  end
+
+  it "takes an optional message argument" do
+    e = Interrupt.new("message")
+    e.signo.should == Signal.list["INT"]
+    e.signm.should == "message"
+  end
+end
+
+describe "rescueing Interrupt" do
+  before do
+    @original_sigint_proc = Signal.trap(:INT, :SIG_DFL)
+  end
+
+  after do
+    Signal.trap(:INT, @original_sigint_proc)
+  end
+
+  it "raises an Interrupt when sent a signal SIGINT" do
+    begin
+      Process.kill :INT, Process.pid
+      sleep
+    rescue Interrupt => e
+      e.signo.should == Signal.list["INT"]
+      e.signm.should == ""
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/io_error_spec.rb b/spec/ruby/core/exception/io_error_spec.rb
new file mode 100644
index 0000000000..0971be332f
--- /dev/null
+++ b/spec/ruby/core/exception/io_error_spec.rb
@@ -0,0 +1,51 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "IOError" do
+  it "is a superclass of EOFError" do
+    IOError.should be_ancestor_of(EOFError)
+  end
+end
+
+describe "IO::EAGAINWaitReadable" do
+  it "combines Errno::EAGAIN and IO::WaitReadable" do
+    IO::EAGAINWaitReadable.superclass.should == Errno::EAGAIN
+    IO::EAGAINWaitReadable.ancestors.should include IO::WaitReadable
+  end
+
+  it "is the same as IO::EWOULDBLOCKWaitReadable if Errno::EAGAIN is the same as Errno::EWOULDBLOCK" do
+    if Errno::EAGAIN.equal? Errno::EWOULDBLOCK
+      IO::EAGAINWaitReadable.should equal IO::EWOULDBLOCKWaitReadable
+    else
+      IO::EAGAINWaitReadable.should_not equal IO::EWOULDBLOCKWaitReadable
+    end
+  end
+end
+
+describe "IO::EWOULDBLOCKWaitReadable" do
+  it "combines Errno::EWOULDBLOCK and IO::WaitReadable" do
+    IO::EWOULDBLOCKWaitReadable.superclass.should == Errno::EWOULDBLOCK
+    IO::EAGAINWaitReadable.ancestors.should include IO::WaitReadable
+  end
+end
+
+describe "IO::EAGAINWaitWritable" do
+  it "combines Errno::EAGAIN and IO::WaitWritable" do
+    IO::EAGAINWaitWritable.superclass.should == Errno::EAGAIN
+    IO::EAGAINWaitWritable.ancestors.should include IO::WaitWritable
+  end
+
+  it "is the same as IO::EWOULDBLOCKWaitWritable if Errno::EAGAIN is the same as Errno::EWOULDBLOCK" do
+    if Errno::EAGAIN.equal? Errno::EWOULDBLOCK
+      IO::EAGAINWaitWritable.should equal IO::EWOULDBLOCKWaitWritable
+    else
+      IO::EAGAINWaitWritable.should_not equal IO::EWOULDBLOCKWaitWritable
+    end
+  end
+end
+
+describe "IO::EWOULDBLOCKWaitWritable" do
+  it "combines Errno::EWOULDBLOCK and IO::WaitWritable" do
+    IO::EWOULDBLOCKWaitWritable.superclass.should == Errno::EWOULDBLOCK
+    IO::EAGAINWaitWritable.ancestors.should include IO::WaitWritable
+  end
+end
diff --git a/spec/ruby/core/exception/load_error_spec.rb b/spec/ruby/core/exception/load_error_spec.rb
new file mode 100644
index 0000000000..2999c66117
--- /dev/null
+++ b/spec/ruby/core/exception/load_error_spec.rb
@@ -0,0 +1,21 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "LoadError#path" do
+  before :each do
+    @le = LoadError.new
+  end
+
+  it "is nil when constructed directly" do
+    @le.path.should == nil
+  end
+end
+
+describe "LoadError raised by load or require" do
+  it "provides the failing path in its #path attribute" do
+    begin
+      require 'file_that_does_not_exist'
+    rescue LoadError => le
+      le.path.should == 'file_that_does_not_exist'
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/message_spec.rb b/spec/ruby/core/exception/message_spec.rb
new file mode 100644
index 0000000000..7eee6d99de
--- /dev/null
+++ b/spec/ruby/core/exception/message_spec.rb
@@ -0,0 +1,27 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#message" do
+  it "returns the class name if there is no message" do
+    Exception.new.message.should == "Exception"
+  end
+
+  it "returns the message passed to #initialize" do
+    Exception.new("Ouch!").message.should == "Ouch!"
+  end
+
+  it "calls #to_s on self" do
+    exc = ExceptionSpecs::OverrideToS.new("you won't see this")
+    exc.message.should == "this is from #to_s"
+  end
+
+  context "when #backtrace is redefined" do
+    it "returns the Exception message" do
+      e = Exception.new
+      e.message.should == 'Exception'
+
+      def e.backtrace; []; end
+      e.message.should == 'Exception'
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/name_error_spec.rb b/spec/ruby/core/exception/name_error_spec.rb
new file mode 100644
index 0000000000..e5b19d6219
--- /dev/null
+++ b/spec/ruby/core/exception/name_error_spec.rb
@@ -0,0 +1,13 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "NameError" do
+  it "is a superclass of NoMethodError" do
+    NameError.should be_ancestor_of(NoMethodError)
+  end
+end
+
+describe "NameError.new" do
+  it "should take optional name argument" do
+    NameError.new("msg","name").name.should == "name"
+  end
+end
diff --git a/spec/ruby/core/exception/name_spec.rb b/spec/ruby/core/exception/name_spec.rb
new file mode 100644
index 0000000000..e8a3c011d2
--- /dev/null
+++ b/spec/ruby/core/exception/name_spec.rb
@@ -0,0 +1,61 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "NameError#name" do
+  it "returns a method name as a symbol" do
+    -> {
+      doesnt_exist
+    }.should raise_error(NameError) {|e| e.name.should == :doesnt_exist }
+  end
+
+  it "returns a constant name as a symbol" do
+    -> {
+      DoesntExist
+    }.should raise_error(NameError) {|e| e.name.should == :DoesntExist }
+  end
+
+  it "returns a constant name without namespace as a symbol" do
+    -> {
+      Object::DoesntExist
+    }.should raise_error(NameError) {|e| e.name.should == :DoesntExist }
+  end
+
+  it "returns a class variable name as a symbol" do
+    -> {
+      -> {
+        @@doesnt_exist
+      }.should complain(/class variable access from toplevel/)
+    }.should raise_error(NameError) { |e| e.name.should == :@@doesnt_exist }
+  end
+
+  ruby_version_is ""..."2.3" do
+    it "always returns a symbol when a NameError is raised from #instance_variable_get" do
+      -> {
+        Object.new.instance_variable_get("invalid_ivar_name")
+      }.should raise_error(NameError) { |e| e.name.should == :invalid_ivar_name }
+    end
+
+    it "always returns a symbol when a NameError is raised from #class_variable_get" do
+      -> {
+        Object.class_variable_get("invalid_cvar_name")
+      }.should raise_error(NameError) { |e| e.name.should == :invalid_cvar_name }
+    end
+  end
+
+  ruby_version_is "2.3" do
+    it "returns the first argument passed to the method when a NameError is raised from #instance_variable_get" do
+      invalid_ivar_name = "invalid_ivar_name"
+
+      -> {
+        Object.new.instance_variable_get(invalid_ivar_name)
+      }.should raise_error(NameError) {|e| e.name.should equal(invalid_ivar_name) }
+    end
+
+    it "returns the first argument passed to the method when a NameError is raised from #class_variable_get" do
+      invalid_cvar_name = "invalid_cvar_name"
+
+      -> {
+        Object.class_variable_get(invalid_cvar_name)
+      }.should raise_error(NameError) {|e| e.name.should equal(invalid_cvar_name) }
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/new_spec.rb b/spec/ruby/core/exception/new_spec.rb
new file mode 100644
index 0000000000..61d35a1dfa
--- /dev/null
+++ b/spec/ruby/core/exception/new_spec.rb
@@ -0,0 +1,7 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+require File.expand_path('../shared/new', __FILE__)
+
+describe "Exception.new" do
+  it_behaves_like(:exception_new, :new)
+end
diff --git a/spec/ruby/core/exception/no_method_error_spec.rb b/spec/ruby/core/exception/no_method_error_spec.rb
new file mode 100644
index 0000000000..cf3fe58b1d
--- /dev/null
+++ b/spec/ruby/core/exception/no_method_error_spec.rb
@@ -0,0 +1,59 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "NoMethodError.new" do
+  it "allows passing method args" do
+    NoMethodError.new("msg","name","args").args.should == "args"
+  end
+
+  it "does not require a name" do
+    NoMethodError.new("msg").message.should == "msg"
+  end
+end
+
+describe "NoMethodError#args" do
+  it "returns an empty array if the caller method had no arguments" do
+    begin
+      NoMethodErrorSpecs::NoMethodErrorB.new.foo
+    rescue Exception => e
+      e.args.should == []
+    end
+  end
+
+  it "returns an array with the same elements as passed to the method" do
+    begin
+      a = NoMethodErrorSpecs::NoMethodErrorA.new
+      NoMethodErrorSpecs::NoMethodErrorB.new.foo(1,a)
+    rescue Exception => e
+      e.args.should == [1,a]
+      e.args[1].object_id.should == a.object_id
+    end
+  end
+end
+
+describe "NoMethodError#message" do
+  it "for an undefined method match /undefined method/" do
+    begin
+      NoMethodErrorSpecs::NoMethodErrorD.new.foo
+    rescue Exception => e
+      e.should be_kind_of(NoMethodError)
+    end
+  end
+
+  it "for an protected method match /protected method/" do
+    begin
+      NoMethodErrorSpecs::NoMethodErrorC.new.a_protected_method
+    rescue Exception => e
+      e.should be_kind_of(NoMethodError)
+    end
+  end
+
+  it "for private method match /private method/" do
+    begin
+      NoMethodErrorSpecs::NoMethodErrorC.new.a_private_method
+    rescue Exception => e
+      e.should be_kind_of(NoMethodError)
+      e.message.match(/private method/).should_not == nil
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/range_error_spec.rb b/spec/ruby/core/exception/range_error_spec.rb
new file mode 100644
index 0000000000..9c0462bbf7
--- /dev/null
+++ b/spec/ruby/core/exception/range_error_spec.rb
@@ -0,0 +1,7 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "RangeError" do
+  it "is a superclass of FloatDomainError" do
+    RangeError.should be_ancestor_of(FloatDomainError)
+  end
+end
diff --git a/spec/ruby/core/exception/readagain_bytes_spec.rb b/spec/ruby/core/exception/readagain_bytes_spec.rb
new file mode 100644
index 0000000000..30efb67686
--- /dev/null
+++ b/spec/ruby/core/exception/readagain_bytes_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::InvalidByteSequenceError#readagain_bytes" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/reason_spec.rb b/spec/ruby/core/exception/reason_spec.rb
new file mode 100644
index 0000000000..fad4d47c64
--- /dev/null
+++ b/spec/ruby/core/exception/reason_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "LocalJumpError#reason" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/receiver_spec.rb b/spec/ruby/core/exception/receiver_spec.rb
new file mode 100644
index 0000000000..83f8d5927c
--- /dev/null
+++ b/spec/ruby/core/exception/receiver_spec.rb
@@ -0,0 +1,62 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+ruby_version_is "2.3" do
+  describe "NameError#receiver" do
+    class ::ReceiverClass
+      def call_undefined_class_variable; @@doesnt_exist end
+    end
+
+    it "returns the object that raised the exception" do
+      receiver = Object.new
+
+      -> {
+        receiver.doesnt_exist
+      }.should raise_error(NameError) {|e| e.receiver.should equal(receiver) }
+    end
+
+    it "returns the Object class when an undefined constant is called without namespace" do
+      -> {
+        DoesntExist
+      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
+    end
+
+    it "returns a class when an undefined constant is called" do
+      -> {
+        NameErrorSpecs::ReceiverClass::DoesntExist
+      }.should raise_error(NameError) {|e| e.receiver.should equal(NameErrorSpecs::ReceiverClass) }
+    end
+
+    it "returns the Object class when an undefined class variable is called" do
+      -> {
+        -> {
+          @@doesnt_exist
+        }.should complain(/class variable access from toplevel/)
+      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
+    end
+
+    it "returns a class when an undefined class variable is called in a subclass' namespace" do
+      -> {
+        NameErrorSpecs::ReceiverClass.new.call_undefined_class_variable
+      }.should raise_error(NameError) {|e| e.receiver.should equal(NameErrorSpecs::ReceiverClass) }
+    end
+
+    it "returns the receiver when raised from #instance_variable_get" do
+      receiver = Object.new
+
+      -> {
+        receiver.instance_variable_get("invalid_ivar_name")
+      }.should raise_error(NameError) {|e| e.receiver.should equal(receiver) }
+    end
+
+    it "returns the receiver when raised from #class_variable_get" do
+      -> {
+        Object.class_variable_get("invalid_cvar_name")
+      }.should raise_error(NameError) {|e| e.receiver.should equal(Object) }
+    end
+
+    it "raises an ArgumentError when the receiver is none" do
+      -> { NameError.new.receiver }.should raise_error(ArgumentError)
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/result_spec.rb b/spec/ruby/core/exception/result_spec.rb
new file mode 100644
index 0000000000..350c071f60
--- /dev/null
+++ b/spec/ruby/core/exception/result_spec.rb
@@ -0,0 +1,29 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "StopIteration" do
+  it "is a subclass of IndexError" do
+    StopIteration.superclass.should equal(IndexError)
+  end
+end
+
+describe "StopIteration#result" do
+  before :each do
+    obj = Object.new
+    def obj.each
+      yield :yield_returned_1
+      yield :yield_returned_2
+      :method_returned
+    end
+    @enum = obj.to_enum
+  end
+
+  it "returns the method-returned-object from an Enumerator" do
+    @enum.next
+    @enum.next
+    lambda { @enum.next }.should(
+      raise_error(StopIteration) do |error|
+        error.result.should equal(:method_returned)
+      end
+    )
+  end
+end
diff --git a/spec/ruby/core/exception/script_error_spec.rb b/spec/ruby/core/exception/script_error_spec.rb
new file mode 100644
index 0000000000..5ca0333261
--- /dev/null
+++ b/spec/ruby/core/exception/script_error_spec.rb
@@ -0,0 +1,15 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "ScriptError" do
+   it "is a superclass of LoadError" do
+     ScriptError.should be_ancestor_of(LoadError)
+   end
+
+   it "is a superclass of NotImplementedError" do
+     ScriptError.should be_ancestor_of(NotImplementedError)
+   end
+
+   it "is a superclass of SyntaxError" do
+     ScriptError.should be_ancestor_of(SyntaxError)
+   end
+end
diff --git a/spec/ruby/core/exception/set_backtrace_spec.rb b/spec/ruby/core/exception/set_backtrace_spec.rb
new file mode 100644
index 0000000000..db58a193ef
--- /dev/null
+++ b/spec/ruby/core/exception/set_backtrace_spec.rb
@@ -0,0 +1,56 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#set_backtrace" do
+  it "accepts an Array of Strings" do
+    err = RuntimeError.new
+    err.set_backtrace ["unhappy"]
+    err.backtrace.should == ["unhappy"]
+  end
+
+  it "allows the user to set the backtrace from a rescued exception" do
+    bt  = ExceptionSpecs::Backtrace.backtrace
+    err = RuntimeError.new
+
+    err.set_backtrace bt
+    err.backtrace.should == bt
+  end
+
+  it "accepts an empty Array" do
+    err = RuntimeError.new
+    err.set_backtrace []
+    err.backtrace.should == []
+  end
+
+  it "accepts a String" do
+    err = RuntimeError.new
+    err.set_backtrace "unhappy"
+    err.backtrace.should == ["unhappy"]
+  end
+
+  it "accepts nil" do
+    err = RuntimeError.new
+    err.set_backtrace nil
+    err.backtrace.should be_nil
+  end
+
+  it "raises a TypeError when passed a Symbol" do
+    err = RuntimeError.new
+    lambda { err.set_backtrace :unhappy }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the Array contains a Symbol" do
+    err = RuntimeError.new
+    lambda { err.set_backtrace ["String", :unhappy] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the array contains nil" do
+    err = Exception.new
+    lambda { err.set_backtrace ["String", nil] }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError when the argument is a nested array" do
+    err = Exception.new
+    lambda { err.set_backtrace ["String", ["String"]] }.should raise_error(TypeError)
+  end
+end
diff --git a/spec/ruby/core/exception/shared/new.rb b/spec/ruby/core/exception/shared/new.rb
new file mode 100644
index 0000000000..bcde8ee4b2
--- /dev/null
+++ b/spec/ruby/core/exception/shared/new.rb
@@ -0,0 +1,18 @@
+describe :exception_new, shared: true do
+  it "creates a new instance of Exception" do
+    Exception.should be_ancestor_of(Exception.send(@method).class)
+  end
+
+  it "sets the message of the Exception when passes a message" do
+    Exception.send(@method, "I'm broken.").message.should == "I'm broken."
+  end
+
+  it "returns 'Exception' for message when no message given" do
+    Exception.send(@method).message.should == "Exception"
+  end
+
+  it "returns the exception when it has a custom constructor" do
+    ExceptionSpecs::ConstructorException.send(@method).should be_kind_of(ExceptionSpecs::ConstructorException)
+  end
+
+end
diff --git a/spec/ruby/core/exception/signal_exception_spec.rb b/spec/ruby/core/exception/signal_exception_spec.rb
new file mode 100644
index 0000000000..3b2d1aad61
--- /dev/null
+++ b/spec/ruby/core/exception/signal_exception_spec.rb
@@ -0,0 +1,74 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SignalException.new" do
+  it "takes a signal number as the first argument" do
+    exc = SignalException.new(Signal.list["INT"])
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "SIGINT"
+    exc.message.should == "SIGINT"
+  end
+
+  it "raises an exception with an invalid signal number" do
+    lambda { SignalException.new(100000) }.should raise_error(ArgumentError)
+  end
+
+  it "takes a signal name without SIG prefix as the first argument" do
+    exc = SignalException.new("INT")
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "SIGINT"
+    exc.message.should == "SIGINT"
+  end
+
+  it "takes a signal name with SIG prefix as the first argument" do
+    exc = SignalException.new("SIGINT")
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "SIGINT"
+    exc.message.should == "SIGINT"
+  end
+
+  it "raises an exception with an invalid signal name" do
+    lambda { SignalException.new("NONEXISTANT") }.should raise_error(ArgumentError)
+  end
+
+  it "takes a signal symbol without SIG prefix as the first argument" do
+    exc = SignalException.new(:INT)
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "SIGINT"
+    exc.message.should == "SIGINT"
+  end
+
+  it "takes a signal symbol with SIG prefix as the first argument" do
+    exc = SignalException.new(:SIGINT)
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "SIGINT"
+    exc.message.should == "SIGINT"
+  end
+
+  it "raises an exception with an invalid signal name" do
+    lambda { SignalException.new(:NONEXISTANT) }.should raise_error(ArgumentError)
+  end
+
+  it "takes an optional message argument with a signal number" do
+    exc = SignalException.new(Signal.list["INT"], "name")
+    exc.signo.should == Signal.list["INT"]
+    exc.signm.should == "name"
+    exc.message.should == "name"
+  end
+
+  it "raises an exception for an optional argument with a signal name" do
+    lambda { SignalException.new("INT","name") }.should raise_error(ArgumentError)
+  end
+end
+
+describe "rescueing SignalException" do
+  it "raises a SignalException when sent a signal" do
+    begin
+      Process.kill :TERM, Process.pid
+      sleep
+    rescue SignalException => e
+      e.signo.should == Signal.list["TERM"]
+      e.signm.should == "SIGTERM"
+      e.message.should == "SIGTERM"
+    end
+  end
+end
diff --git a/spec/ruby/core/exception/signm_spec.rb b/spec/ruby/core/exception/signm_spec.rb
new file mode 100644
index 0000000000..e205b79e19
--- /dev/null
+++ b/spec/ruby/core/exception/signm_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SignalException#signm" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/signo_spec.rb b/spec/ruby/core/exception/signo_spec.rb
new file mode 100644
index 0000000000..08c85274ca
--- /dev/null
+++ b/spec/ruby/core/exception/signo_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SignalException#signo" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/source_encoding_name_spec.rb b/spec/ruby/core/exception/source_encoding_name_spec.rb
new file mode 100644
index 0000000000..5796072121
--- /dev/null
+++ b/spec/ruby/core/exception/source_encoding_name_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::UndefinedConversionError#source_encoding_name" do
+  it "needs to be reviewed for spec completeness"
+end
+
+describe "Encoding::InvalidByteSequenceError#source_encoding_name" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/source_encoding_spec.rb b/spec/ruby/core/exception/source_encoding_spec.rb
new file mode 100644
index 0000000000..796bec88f6
--- /dev/null
+++ b/spec/ruby/core/exception/source_encoding_spec.rb
@@ -0,0 +1,9 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Encoding::UndefinedConversionError#source_encoding" do
+  it "needs to be reviewed for spec completeness"
+end
+
+describe "Encoding::InvalidByteSequenceError#source_encoding" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/standard_error_spec.rb b/spec/ruby/core/exception/standard_error_spec.rb
new file mode 100644
index 0000000000..9b3af4b322
--- /dev/null
+++ b/spec/ruby/core/exception/standard_error_spec.rb
@@ -0,0 +1,50 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "StandardError" do
+  it "is a superclass of ArgumentError" do
+    StandardError.should be_ancestor_of(ArgumentError)
+  end
+
+  it "is a superclass of IOError" do
+    StandardError.should be_ancestor_of(IOError)
+  end
+
+  it "is a superclass of IndexError" do
+    StandardError.should be_ancestor_of(IndexError)
+  end
+
+  it "is a superclass of LocalJumpError" do
+    StandardError.should be_ancestor_of(LocalJumpError)
+  end
+
+  it "is a superclass of NameError" do
+    StandardError.should be_ancestor_of(NameError)
+  end
+
+  it "is a superclass of RangeError" do
+    StandardError.should be_ancestor_of(RangeError)
+  end
+
+  it "is a superclass of RegexpError" do
+    StandardError.should be_ancestor_of(RegexpError)
+  end
+
+  it "is a superclass of RuntimeError" do
+    StandardError.should be_ancestor_of(RuntimeError)
+  end
+
+  it "is a superclass of SystemCallError" do
+    StandardError.should be_ancestor_of(SystemCallError.new("").class)
+  end
+  it "is a superclass of ThreadError" do
+    StandardError.should be_ancestor_of(ThreadError)
+  end
+
+  it "is a superclass of TypeError" do
+    StandardError.should be_ancestor_of(TypeError)
+  end
+
+  it "is a superclass of ZeroDivisionError" do
+    StandardError.should be_ancestor_of(ZeroDivisionError)
+  end
+end
diff --git a/spec/ruby/core/exception/status_spec.rb b/spec/ruby/core/exception/status_spec.rb
new file mode 100644
index 0000000000..e648dc0adc
--- /dev/null
+++ b/spec/ruby/core/exception/status_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SystemExit#status" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/success_spec.rb b/spec/ruby/core/exception/success_spec.rb
new file mode 100644
index 0000000000..d9b69b4f45
--- /dev/null
+++ b/spec/ruby/core/exception/success_spec.rb
@@ -0,0 +1,5 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SystemExit#success?" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/system_call_error_spec.rb b/spec/ruby/core/exception/system_call_error_spec.rb
new file mode 100644
index 0000000000..edcc8d3734
--- /dev/null
+++ b/spec/ruby/core/exception/system_call_error_spec.rb
@@ -0,0 +1,89 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "SystemCallError" do
+  before :each do
+    ScratchPad.clear
+  end
+
+  it "can be subclassed" do
+    ExceptionSpecs::SCESub = Class.new(SystemCallError) do
+      def initialize
+        ScratchPad.record :initialize
+      end
+    end
+
+    exc = ExceptionSpecs::SCESub.new
+    ScratchPad.recorded.should equal(:initialize)
+    exc.should be_an_instance_of(ExceptionSpecs::SCESub)
+  end
+end
+
+describe "SystemCallError.new" do
+  it "requires at least one argument" do
+    lambda { SystemCallError.new }.should raise_error(ArgumentError)
+  end
+
+  it "accepts single Fixnum argument as errno" do
+    SystemCallError.new(-2**24).errno.should == -2**24
+    SystemCallError.new(42).errno.should == 42
+    SystemCallError.new(2**24).errno.should == 2**24
+  end
+
+  it "constructs the appropriate Errno class" do
+    # EINVAL should be more or less mortable across the platforms,
+    # so let's use it then.
+    SystemCallError.new(22).should be_kind_of(SystemCallError)
+    SystemCallError.new(22).should be_an_instance_of(Errno::EINVAL)
+    SystemCallError.new(2**28).should be_an_instance_of(SystemCallError)
+  end
+
+  it "accepts an optional custom message preceding the errno" do
+    exc = SystemCallError.new("custom message", 22)
+    exc.should be_an_instance_of(Errno::EINVAL)
+    exc.errno.should == 22
+    exc.message.should == "Invalid argument - custom message"
+  end
+
+  it "accepts an optional third argument specifying the location" do
+    exc = SystemCallError.new("custom message", 22, "location")
+    exc.should be_an_instance_of(Errno::EINVAL)
+    exc.errno.should == 22
+    exc.message.should == "Invalid argument @ location - custom message"
+  end
+
+  it "returns an arity of -1 for the initialize method" do
+    SystemCallError.instance_method(:initialize).arity.should == -1
+  end
+end
+
+describe "SystemCallError#errno" do
+  it "returns nil when no errno given" do
+    SystemCallError.new("message").errno.should == nil
+  end
+
+  it "returns the errno given as optional argument to new" do
+    SystemCallError.new("message", -2**20).errno.should == -2**20
+    SystemCallError.new("message", -1).errno.should == -1
+    SystemCallError.new("message", 0).errno.should == 0
+    SystemCallError.new("message", 1).errno.should == 1
+    SystemCallError.new("message", 42).errno.should == 42
+    SystemCallError.new("message", 2**20).errno.should == 2**20
+  end
+end
+
+describe "SystemCallError#message" do
+  it "returns the default message when no message is given" do
+    platform_is :aix do
+      SystemCallError.new(2**28).message.should =~ /Error .*occurred/i
+    end
+    platform_is_not :aix do
+      SystemCallError.new(2**28).message.should =~ /Unknown error/i
+    end
+  end
+
+  it "returns the message given as an argument to new" do
+    SystemCallError.new("message", 1).message.should =~ /message/
+    SystemCallError.new("XXX").message.should =~ /XXX/
+  end
+end
diff --git a/spec/ruby/core/exception/system_stack_error_spec.rb b/spec/ruby/core/exception/system_stack_error_spec.rb
new file mode 100644
index 0000000000..acd56c0a0f
--- /dev/null
+++ b/spec/ruby/core/exception/system_stack_error_spec.rb
@@ -0,0 +1,7 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "SystemStackError" do
+  it "is a subclass of Exception" do
+    SystemStackError.superclass.should == Exception
+  end
+end
diff --git a/spec/ruby/core/exception/to_s_spec.rb b/spec/ruby/core/exception/to_s_spec.rb
new file mode 100644
index 0000000000..83234bfe23
--- /dev/null
+++ b/spec/ruby/core/exception/to_s_spec.rb
@@ -0,0 +1,23 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/common', __FILE__)
+
+describe "Exception#to_s" do
+  it "returns the self's name if no message is set" do
+    Exception.new.to_s.should == 'Exception'
+    ExceptionSpecs::Exceptional.new.to_s.should == 'ExceptionSpecs::Exceptional'
+  end
+
+  it "returns self's message if set" do
+    ExceptionSpecs::Exceptional.new('!!').to_s.should == '!!'
+  end
+
+  it "calls #to_s on the message" do
+    message = mock("message")
+    message.should_receive(:to_s).and_return("message")
+    ExceptionSpecs::Exceptional.new(message).to_s.should == "message"
+  end
+end
+
+describe "NameError#to_s" do
+  it "needs to be reviewed for spec completeness"
+end
diff --git a/spec/ruby/core/exception/uncaught_throw_error_spec.rb b/spec/ruby/core/exception/uncaught_throw_error_spec.rb
new file mode 100644
index 0000000000..3ed166af5b
--- /dev/null
+++ b/spec/ruby/core/exception/uncaught_throw_error_spec.rb
@@ -0,0 +1,19 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "UncaughtThrowError" do
+  it "is a subclass of ArgumentError" do
+    ArgumentError.should be_ancestor_of(UncaughtThrowError)
+  end
+end
+
+describe "UncaughtThrowError#tag" do
+  it "returns the object thrown" do
+    begin
+      throw :abc
+
+    rescue UncaughtThrowError => e
+      e.tag.should == :abc
+    end
+  end
+end
+