From 1d15d5f08032acf1b7bceacbb450d617ff6e0931 Mon Sep 17 00:00:00 2001
From: eregon <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 20 Sep 2017 20:18:52 +0000
Subject: 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
---
 spec/ruby/core/string/modulo_spec.rb | 789 +++++++++++++++++++++++++++++++++++
 1 file changed, 789 insertions(+)
 create mode 100644 spec/ruby/core/string/modulo_spec.rb

(limited to 'spec/ruby/core/string/modulo_spec.rb')

diff --git a/spec/ruby/core/string/modulo_spec.rb b/spec/ruby/core/string/modulo_spec.rb
new file mode 100644
index 0000000000..4f26ac5033
--- /dev/null
+++ b/spec/ruby/core/string/modulo_spec.rb
@@ -0,0 +1,789 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes.rb', __FILE__)
+
+describe "String#%" do
+  it "formats multiple expressions" do
+    ("%b %x %d %s" % [10, 10, 10, 10]).should == "1010 a 10 10"
+  end
+
+  it "formats expressions mid string" do
+    ("hello %s!" % "world").should == "hello world!"
+  end
+
+  it "formats %% into %" do
+    ("%d%% %s" % [10, "of chickens!"]).should == "10% of chickens!"
+  end
+
+  ruby_version_is ""..."2.5" do
+    it "formats single % character at the end as literal %" do
+      ("%" % []).should == "%"
+      ("foo%" % []).should == "foo%"
+    end
+  end
+
+  ruby_version_is "2.5" do
+    it "raises an error if single % appears at the end" do
+      lambda { ("%" % []) }.should raise_error(ArgumentError)
+      lambda { ("foo%" % [])}.should raise_error(ArgumentError)
+    end
+  end
+
+  it "formats single % character before a newline as literal %" do
+    ("%\n" % []).should == "%\n"
+    ("foo%\n" % []).should == "foo%\n"
+    ("%\n.3f" % 1.2).should == "%\n.3f"
+  end
+
+  it "formats single % character before a NUL as literal %" do
+    ("%\0" % []).should == "%\0"
+    ("foo%\0" % []).should == "foo%\0"
+    ("%\0.3f" % 1.2).should == "%\0.3f"
+  end
+
+  it "raises an error if single % appears anywhere else" do
+    lambda { (" % " % []) }.should raise_error(ArgumentError)
+    lambda { ("foo%quux" % []) }.should raise_error(ArgumentError)
+  end
+
+  it "raises an error if NULL or \\n appear anywhere else in the format string" do
+    begin
+      old_debug, $DEBUG = $DEBUG, false
+
+      lambda { "%.\n3f" % 1.2 }.should raise_error(ArgumentError)
+      lambda { "%.3\nf" % 1.2 }.should raise_error(ArgumentError)
+      lambda { "%.\03f" % 1.2 }.should raise_error(ArgumentError)
+      lambda { "%.3\0f" % 1.2 }.should raise_error(ArgumentError)
+    ensure
+      $DEBUG = old_debug
+    end
+  end
+
+  it "ignores unused arguments when $DEBUG is false" do
+    begin
+      old_debug = $DEBUG
+      $DEBUG = false
+
+      ("" % [1, 2, 3]).should == ""
+      ("%s" % [1, 2, 3]).should == "1"
+    ensure
+      $DEBUG = old_debug
+    end
+  end
+
+  it "raises an ArgumentError for unused arguments when $DEBUG is true" do
+    begin
+      old_debug = $DEBUG
+      $DEBUG = true
+      s = $stderr
+      $stderr = IOStub.new
+
+      lambda { "" % [1, 2, 3]   }.should raise_error(ArgumentError)
+      lambda { "%s" % [1, 2, 3] }.should raise_error(ArgumentError)
+    ensure
+      $DEBUG = old_debug
+      $stderr = s
+    end
+  end
+
+  it "always allows unused arguments when positional argument style is used" do
+    begin
+      old_debug = $DEBUG
+      $DEBUG = false
+
+      ("%2$s" % [1, 2, 3]).should == "2"
+      $DEBUG = true
+      ("%2$s" % [1, 2, 3]).should == "2"
+    ensure
+      $DEBUG = old_debug
+    end
+  end
+
+  it "replaces trailing absolute argument specifier without type with percent sign" do
+    ("hello %1$" % "foo").should == "hello %"
+  end
+
+  it "raises an ArgumentError when given invalid argument specifiers" do
+    lambda { "%1" % [] }.should raise_error(ArgumentError)
+    lambda { "%+" % [] }.should raise_error(ArgumentError)
+    lambda { "%-" % [] }.should raise_error(ArgumentError)
+    lambda { "%#" % [] }.should raise_error(ArgumentError)
+    lambda { "%0" % [] }.should raise_error(ArgumentError)
+    lambda { "%*" % [] }.should raise_error(ArgumentError)
+    lambda { "%." % [] }.should raise_error(ArgumentError)
+    lambda { "%_" % [] }.should raise_error(ArgumentError)
+    lambda { "%0$s" % "x"              }.should raise_error(ArgumentError)
+    lambda { "%*0$s" % [5, "x"]        }.should raise_error(ArgumentError)
+    lambda { "%*1$.*0$1$s" % [1, 2, 3] }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when multiple positional argument tokens are given for one format specifier" do
+    lambda { "%1$1$s" % "foo" }.should raise_error(ArgumentError)
+  end
+
+  it "respects positional arguments and precision tokens given for one format specifier" do
+    ("%2$1d" % [1, 0]).should == "0"
+    ("%2$1d" % [0, 1]).should == "1"
+
+    ("%2$.2f" % [1, 0]).should == "0.00"
+    ("%2$.2f" % [0, 1]).should == "1.00"
+  end
+
+  it "allows more than one digit of position" do
+    ("%50$d" % (0..100).to_a).should == "49"
+  end
+
+  it "raises an ArgumentError when multiple width star tokens are given for one format specifier" do
+    lambda { "%**s" % [5, 5, 5] }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when a width star token is seen after a width token" do
+    lambda { "%5*s" % [5, 5] }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when multiple precision tokens are given" do
+    lambda { "%.5.5s" % 5      }.should raise_error(ArgumentError)
+    lambda { "%.5.*s" % [5, 5] }.should raise_error(ArgumentError)
+    lambda { "%.*.5s" % [5, 5] }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when there are less arguments than format specifiers" do
+    ("foo" % []).should == "foo"
+    lambda { "%s" % []     }.should raise_error(ArgumentError)
+    lambda { "%s %s" % [1] }.should raise_error(ArgumentError)
+  end
+
+  it "raises an ArgumentError when absolute and relative argument numbers are mixed" do
+    lambda { "%s %1$s" % "foo" }.should raise_error(ArgumentError)
+    lambda { "%1$s %s" % "foo" }.should raise_error(ArgumentError)
+
+    lambda { "%s %2$s" % ["foo", "bar"] }.should raise_error(ArgumentError)
+    lambda { "%2$s %s" % ["foo", "bar"] }.should raise_error(ArgumentError)
+
+    lambda { "%*2$s" % [5, 5, 5]     }.should raise_error(ArgumentError)
+    lambda { "%*.*2$s" % [5, 5, 5]   }.should raise_error(ArgumentError)
+    lambda { "%*2$.*2$s" % [5, 5, 5] }.should raise_error(ArgumentError)
+    lambda { "%*.*2$s" % [5, 5, 5]   }.should raise_error(ArgumentError)
+  end
+
+  it "allows reuse of the one argument multiple via absolute argument numbers" do
+    ("%1$s %1$s" % "foo").should == "foo foo"
+    ("%1$s %2$s %1$s %2$s" % ["foo", "bar"]).should == "foo bar foo bar"
+  end
+
+  it "always interprets an array argument as a list of argument parameters" do
+    lambda { "%p" % [] }.should raise_error(ArgumentError)
+    ("%p" % [1]).should == "1"
+    ("%p %p" % [1, 2]).should == "1 2"
+  end
+
+  it "always interprets an array subclass argument as a list of argument parameters" do
+    lambda { "%p" % StringSpecs::MyArray[] }.should raise_error(ArgumentError)
+    ("%p" % StringSpecs::MyArray[1]).should == "1"
+    ("%p %p" % StringSpecs::MyArray[1, 2]).should == "1 2"
+  end
+
+  it "allows positional arguments for width star and precision star arguments" do
+    ("%*1$.*2$3$d" % [10, 5, 1]).should == "     00001"
+  end
+
+  it "allows negative width to imply '-' flag" do
+    ("%*1$.*2$3$d" % [-10, 5, 1]).should == "00001     "
+    ("%-*1$.*2$3$d" % [10, 5, 1]).should == "00001     "
+    ("%-*1$.*2$3$d" % [-10, 5, 1]).should == "00001     "
+  end
+
+  it "ignores negative precision" do
+    ("%*1$.*2$3$d" % [10, -5, 1]).should == "         1"
+  end
+
+  it "allows a star to take an argument number to use as the width" do
+    ("%1$*2$s" % ["a", 8]).should == "       a"
+    ("%1$*10$s" % ["a",0,0,0,0,0,0,0,0,8]).should == "       a"
+  end
+
+  it "calls to_int on width star and precision star tokens" do
+    w = mock('10')
+    w.should_receive(:to_int).and_return(10)
+
+    p = mock('5')
+    p.should_receive(:to_int).and_return(5)
+
+    ("%*.*f" % [w, p, 1]).should == "   1.00000"
+
+
+    w = mock('10')
+    w.should_receive(:to_int).and_return(10)
+
+    p = mock('5')
+    p.should_receive(:to_int).and_return(5)
+
+    ("%*.*d" % [w, p, 1]).should == "     00001"
+  end
+
+  it "does not call #to_a to convert the argument" do
+    x = mock("string modulo to_a")
+    x.should_not_receive(:to_a)
+    x.should_receive(:to_s).and_return("x")
+
+    ("%s" % x).should == "x"
+  end
+
+  it "calls #to_ary to convert the argument" do
+    x = mock("string modulo to_ary")
+    x.should_not_receive(:to_s)
+    x.should_receive(:to_ary).and_return(["x"])
+
+    ("%s" % x).should == "x"
+  end
+
+  it "wraps the object in an Array if #to_ary returns nil" do
+    x = mock("string modulo to_ary")
+    x.should_receive(:to_ary).and_return(nil)
+    x.should_receive(:to_s).and_return("x")
+
+    ("%s" % x).should == "x"
+  end
+
+  it "raises a TypeError if #to_ary does not return an Array" do
+    x = mock("string modulo to_ary")
+    x.should_receive(:to_ary).and_return("x")
+
+    lambda { "%s" % x }.should raise_error(TypeError)
+  end
+
+  it "tries to convert the argument to Array by calling #to_ary" do
+    obj = mock('[1,2]')
+    def obj.to_ary() [1, 2] end
+    def obj.to_s() "obj" end
+    ("%s %s" % obj).should == "1 2"
+    ("%s" % obj).should == "1"
+  end
+
+  it "doesn't return subclass instances when called on a subclass" do
+    universal = mock('0')
+    def universal.to_int() 0 end
+    def universal.to_str() "0" end
+    def universal.to_f() 0.0 end
+
+    [
+      "", "foo",
+      "%b", "%B", "%c", "%d", "%e", "%E",
+      "%f", "%g", "%G", "%i", "%o", "%p",
+      "%s", "%u", "%x", "%X"
+    ].each do |format|
+      (StringSpecs::MyString.new(format) % universal).should be_an_instance_of(String)
+    end
+  end
+
+  it "always taints the result when the format string is tainted" do
+    universal = mock('0')
+    def universal.to_int() 0 end
+    def universal.to_str() "0" end
+    def universal.to_f() 0.0 end
+
+    [
+      "", "foo",
+      "%b", "%B", "%c", "%d", "%e", "%E",
+      "%f", "%g", "%G", "%i", "%o", "%p",
+      "%s", "%u", "%x", "%X"
+    ].each do |format|
+      subcls_format = StringSpecs::MyString.new(format)
+      subcls_format.taint
+      format.taint
+
+      (format % universal).tainted?.should == true
+      (subcls_format % universal).tainted?.should == true
+    end
+  end
+
+  it "supports binary formats using %b for positive numbers" do
+    ("%b" % 10).should == "1010"
+    ("% b" % 10).should == " 1010"
+    ("%1$b" % [10, 20]).should == "1010"
+    ("%#b" % 10).should == "0b1010"
+    ("%+b" % 10).should == "+1010"
+    ("%-9b" % 10).should == "1010     "
+    ("%05b" % 10).should == "01010"
+    ("%*b" % [10, 6]).should == "       110"
+    ("%*b" % [-10, 6]).should == "110       "
+    ("%.4b" % 2).should == "0010"
+    ("%.32b" % 2147483648).should == "10000000000000000000000000000000"
+  end
+
+  it "supports binary formats using %b for negative numbers" do
+    ("%b" % -5).should == "..1011"
+    ("%0b" % -5).should == "..1011"
+    ("%.1b" % -5).should == "..1011"
+    ("%.7b" % -5).should == "..11011"
+    ("%.10b" % -5).should == "..11111011"
+    ("% b" % -5).should == "-101"
+    ("%+b" % -5).should == "-101"
+    not_supported_on :opal do
+      ("%b" % -(2 ** 64 + 5)).should ==
+        "..101111111111111111111111111111111111111111111111111111111111111011"
+    end
+  end
+
+  it "supports binary formats using %B with same behaviour as %b except for using 0B instead of 0b for #" do
+    ("%B" % 10).should == ("%b" % 10)
+    ("% B" % 10).should == ("% b" % 10)
+    ("%1$B" % [10, 20]).should == ("%1$b" % [10, 20])
+    ("%+B" % 10).should == ("%+b" % 10)
+    ("%-9B" % 10).should == ("%-9b" % 10)
+    ("%05B" % 10).should == ("%05b" % 10)
+    ("%*B" % [10, 6]).should == ("%*b" % [10, 6])
+    ("%*B" % [-10, 6]).should == ("%*b" % [-10, 6])
+
+    ("%B" % -5).should == ("%b" % -5)
+    ("%0B" % -5).should == ("%0b" % -5)
+    ("%.1B" % -5).should == ("%.1b" % -5)
+    ("%.7B" % -5).should == ("%.7b" % -5)
+    ("%.10B" % -5).should == ("%.10b" % -5)
+    ("% B" % -5).should == ("% b" % -5)
+    ("%+B" % -5).should == ("%+b" % -5)
+    not_supported_on :opal do
+      ("%B" % -(2 ** 64 + 5)).should == ("%b" % -(2 ** 64 + 5))
+    end
+
+    ("%#B" % 10).should == "0B1010"
+  end
+
+  it "supports character formats using %c" do
+    ("%c" % 10).should == "\n"
+    ("%2$c" % [10, 11, 14]).should == "\v"
+    ("%-4c" % 10).should == "\n   "
+    ("%*c" % [10, 3]).should == "         \003"
+    ("%c" % 42).should == "*"
+
+    lambda { "%c" % Object }.should raise_error(TypeError)
+  end
+
+  it "supports single character strings as argument for %c" do
+    ("%c" % 'A').should == "A"
+  end
+
+  it "raises an exception for multiple character strings as argument for %c" do
+    lambda { "%c" % 'AA' }.should raise_error(ArgumentError)
+  end
+
+  it "calls to_str on argument for %c formats" do
+    obj = mock('A')
+    obj.should_receive(:to_str).and_return('A')
+
+    ("%c" % obj).should == "A"
+  end
+
+  it "calls #to_ary on argument for %c formats" do
+    obj = mock('65')
+    obj.should_receive(:to_ary).and_return([65])
+    ("%c" % obj).should == ("%c" % [65])
+  end
+
+  it "calls #to_int on argument for %c formats, if the argument does not respond to #to_ary" do
+    obj = mock('65')
+    obj.should_receive(:to_int).and_return(65)
+
+    ("%c" % obj).should == ("%c" % 65)
+  end
+
+  %w(d i).each do |f|
+    format = "%" + f
+
+    it "supports integer formats using #{format}" do
+      ("%#{f}" % 10).should == "10"
+      ("% #{f}" % 10).should == " 10"
+      ("%1$#{f}" % [10, 20]).should == "10"
+      ("%+#{f}" % 10).should == "+10"
+      ("%-7#{f}" % 10).should == "10     "
+      ("%04#{f}" % 10).should == "0010"
+      ("%*#{f}" % [10, 4]).should == "         4"
+      ("%6.4#{f}" % 123).should == "  0123"
+    end
+
+    it "supports negative integers using #{format}" do
+      ("%#{f}" % -5).should == "-5"
+      ("%3#{f}" % -5).should == " -5"
+      ("%03#{f}" % -5).should == "-05"
+      ("%+03#{f}" % -5).should == "-05"
+      ("%+.2#{f}" % -5).should == "-05"
+      ("%-3#{f}" % -5).should == "-5 "
+      ("%6.4#{f}" % -123).should == " -0123"
+    end
+
+    it "supports negative integers using #{format}, giving priority to `-`" do
+      ("%-03#{f}" % -5).should == "-5 "
+      ("%+-03#{f}" % -5).should == "-5 "
+    end
+  end
+
+  it "supports float formats using %e" do
+    ("%e" % 10).should == "1.000000e+01"
+    ("% e" % 10).should == " 1.000000e+01"
+    ("%1$e" % 10).should == "1.000000e+01"
+    ("%#e" % 10).should == "1.000000e+01"
+    ("%+e" % 10).should == "+1.000000e+01"
+    ("%-7e" % 10).should == "1.000000e+01"
+    ("%05e" % 10).should == "1.000000e+01"
+    ("%*e" % [10, 9]).should == "9.000000e+00"
+  end
+
+  it "supports float formats using %e, but Inf, -Inf, and NaN are not floats" do
+    ("%e" % 1e1020).should == "Inf"
+    ("%e" % -1e1020).should == "-Inf"
+    ("%e" % -Float::NAN).should == "NaN"
+    ("%e" % Float::NAN).should == "NaN"
+  end
+
+  it "supports float formats using %E, but Inf, -Inf, and NaN are not floats" do
+    ("%E" % 1e1020).should == "Inf"
+    ("%E" % -1e1020).should == "-Inf"
+    ("%-10E" % 1e1020).should == "Inf       "
+    ("%10E" % 1e1020).should == "       Inf"
+    ("%+E" % 1e1020).should == "+Inf"
+    ("% E" % 1e1020).should == " Inf"
+    ("%E" % Float::NAN).should == "NaN"
+    ("%E" % -Float::NAN).should == "NaN"
+  end
+
+  it "supports float formats using %E" do
+    ("%E" % 10).should == "1.000000E+01"
+    ("% E" % 10).should == " 1.000000E+01"
+    ("%1$E" % 10).should == "1.000000E+01"
+    ("%#E" % 10).should == "1.000000E+01"
+    ("%+E" % 10).should == "+1.000000E+01"
+    ("%-7E" % 10).should == "1.000000E+01"
+    ("%05E" % 10).should == "1.000000E+01"
+    ("%*E" % [10, 9]).should == "9.000000E+00"
+  end
+
+  it "pads with spaces for %E with Inf, -Inf, and NaN" do
+    ("%010E" % -1e1020).should == "      -Inf"
+    ("%010E" % 1e1020).should == "       Inf"
+    ("%010E" % Float::NAN).should == "       NaN"
+  end
+
+  it "supports float formats using %f" do
+    ("%f" % 10).should == "10.000000"
+    ("% f" % 10).should == " 10.000000"
+    ("%1$f" % 10).should == "10.000000"
+    ("%#f" % 10).should == "10.000000"
+    ("%#0.3f" % 10).should == "10.000"
+    ("%+f" % 10).should == "+10.000000"
+    ("%-7f" % 10).should == "10.000000"
+    ("%05f" % 10).should == "10.000000"
+    ("%0.5f" % 10).should == "10.00000"
+    ("%*f" % [10, 9]).should == "  9.000000"
+  end
+
+  it "supports float formats using %g" do
+    ("%g" % 10).should == "10"
+    ("% g" % 10).should == " 10"
+    ("%1$g" % 10).should == "10"
+    ("%#g" % 10).should == "10.0000"
+    ("%#.3g" % 10).should == "10.0"
+    ("%+g" % 10).should == "+10"
+    ("%-7g" % 10).should == "10     "
+    ("%05g" % 10).should == "00010"
+    ("%g" % 10**10).should == "1e+10"
+    ("%*g" % [10, 9]).should == "         9"
+  end
+
+  it "supports float formats using %G" do
+    ("%G" % 10).should == "10"
+    ("% G" % 10).should == " 10"
+    ("%1$G" % 10).should == "10"
+    ("%#G" % 10).should == "10.0000"
+    ("%#.3G" % 10).should == "10.0"
+    ("%+G" % 10).should == "+10"
+    ("%-7G" % 10).should == "10     "
+    ("%05G" % 10).should == "00010"
+    ("%G" % 10**10).should == "1E+10"
+    ("%*G" % [10, 9]).should == "         9"
+  end
+
+  it "supports octal formats using %o for positive numbers" do
+    ("%o" % 10).should == "12"
+    ("% o" % 10).should == " 12"
+    ("%1$o" % [10, 20]).should == "12"
+    ("%#o" % 10).should == "012"
+    ("%+o" % 10).should == "+12"
+    ("%-9o" % 10).should == "12       "
+    ("%05o" % 10).should == "00012"
+    ("%*o" % [10, 6]).should == "         6"
+  end
+
+  it "supports octal formats using %o for negative numbers" do
+    # These are incredibly wrong. -05 == -5, not 7177777...whatever
+    ("%o" % -5).should == "..73"
+    ("%0o" % -5).should == "..73"
+    ("%.4o" % 20).should == "0024"
+    ("%.1o" % -5).should == "..73"
+    ("%.7o" % -5).should == "..77773"
+    ("%.10o" % -5).should == "..77777773"
+
+    ("% o" % -26).should == "-32"
+    ("%+o" % -26).should == "-32"
+    not_supported_on :opal do
+      ("%o" % -(2 ** 64 + 5)).should == "..75777777777777777777773"
+    end
+  end
+
+  it "supports inspect formats using %p" do
+    ("%p" % 10).should == "10"
+    ("%1$p" % [10, 5]).should == "10"
+    ("%-22p" % 10).should == "10                    "
+    ("%*p" % [10, 10]).should == "        10"
+    ("%p" % {capture: 1}).should == "{:capture=>1}"
+    ("%p" % "str").should == "\"str\""
+  end
+
+  it "calls inspect on arguments for %p format" do
+    obj = mock('obj')
+    def obj.inspect() "obj" end
+    ("%p" % obj).should == "obj"
+
+    # undef is not working
+    # obj = mock('obj')
+    # class << obj; undef :inspect; end
+    # def obj.method_missing(*args) "obj" end
+    # ("%p" % obj).should == "obj"
+  end
+
+  it "taints result for %p when argument.inspect is tainted" do
+    obj = mock('x')
+    def obj.inspect() "x".taint end
+
+    ("%p" % obj).tainted?.should == true
+
+    obj = mock('x'); obj.taint
+    def obj.inspect() "x" end
+
+    ("%p" % obj).tainted?.should == false
+  end
+
+  it "supports string formats using %s" do
+    ("%s" % "hello").should == "hello"
+    ("%s" % "").should == ""
+    ("%s" % 10).should == "10"
+    ("%1$s" % [10, 8]).should == "10"
+    ("%-5s" % 10).should == "10   "
+    ("%*s" % [10, 9]).should == "         9"
+  end
+
+  it "respects a space padding request not as part of the width" do
+    x = "% -5s" % ["foo"]
+    x.should == "foo  "
+  end
+
+  it "calls to_s on non-String arguments for %s format" do
+    obj = mock('obj')
+    def obj.to_s() "obj" end
+
+    ("%s" % obj).should == "obj"
+
+    # undef doesn't work
+    # obj = mock('obj')
+    # class << obj; undef :to_s; end
+    # def obj.method_missing(*args) "obj" end
+    #
+    # ("%s" % obj).should == "obj"
+  end
+
+  it "taints result for %s when argument is tainted" do
+    ("%s" % "x".taint).tainted?.should == true
+    ("%s" % mock('x').taint).tainted?.should == true
+  end
+
+  # MRI crashes on this one.
+  # See http://groups.google.com/group/ruby-core-google/t/c285c18cd94c216d
+  it "raises an ArgumentError for huge precisions for %s" do
+    block = lambda { "%.25555555555555555555555555555555555555s" % "hello world" }
+    block.should raise_error(ArgumentError)
+  end
+
+  # Note: %u has been changed to an alias for %d in 1.9.
+  it "supports unsigned formats using %u" do
+    ("%u" % 10).should == "10"
+    ("% u" % 10).should == " 10"
+    ("%1$u" % [10, 20]).should == "10"
+    ("%+u" % 10).should == "+10"
+    ("%-7u" % 10).should == "10     "
+    ("%04u" % 10).should == "0010"
+    ("%*u" % [10, 4]).should == "         4"
+  end
+
+  it "formats negative values with a leading sign using %u" do
+    ("% u" % -26).should == "-26"
+    ("%+u" % -26).should == "-26"
+  end
+
+  it "supports negative bignums with %u or %d" do
+    ("%u" % -(2 ** 64 + 5)).should == "-18446744073709551621"
+    ("%d" % -(2 ** 64 + 5)).should == "-18446744073709551621"
+  end
+
+  it "supports hex formats using %x for positive numbers" do
+    ("%x" % 10).should == "a"
+    ("% x" % 10).should == " a"
+    ("%1$x" % [10, 20]).should == "a"
+    ("%#x" % 10).should == "0xa"
+    ("%+x" % 10).should == "+a"
+    ("%-9x" % 10).should == "a        "
+    ("%05x" % 10).should == "0000a"
+    ("%*x" % [10, 6]).should == "         6"
+    ("%.4x" % 20).should == "0014"
+    ("%x" % 0xFFFFFFFF).should == "ffffffff"
+  end
+
+  it "supports hex formats using %x for negative numbers" do
+    ("%x" % -5).should == "..fb"
+    ("%0x" % -5).should == "..fb"
+    ("%.1x" % -5).should == "..fb"
+    ("%.7x" % -5).should == "..ffffb"
+    ("%.10x" % -5).should == "..fffffffb"
+    ("% x" % -26).should == "-1a"
+    ("%+x" % -26).should == "-1a"
+    not_supported_on :opal do
+      ("%x" % -(2 ** 64 + 5)).should == "..fefffffffffffffffb"
+    end
+  end
+
+  it "supports hex formats using %X for positive numbers" do
+    ("%X" % 10).should == "A"
+    ("% X" % 10).should == " A"
+    ("%1$X" % [10, 20]).should == "A"
+    ("%#X" % 10).should == "0XA"
+    ("%+X" % 10).should == "+A"
+    ("%-9X" % 10).should == "A        "
+    ("%05X" % 10).should == "0000A"
+    ("%*X" % [10, 6]).should == "         6"
+    ("%X" % 0xFFFFFFFF).should == "FFFFFFFF"
+  end
+
+  it "supports hex formats using %X for negative numbers" do
+    ("%X" % -5).should == "..FB"
+    ("%0X" % -5).should == "..FB"
+    ("%.1X" % -5).should == "..FB"
+    ("%.7X" % -5).should == "..FFFFB"
+    ("%.10X" % -5).should == "..FFFFFFFB"
+    ("% X" % -26).should == "-1A"
+    ("%+X" % -26).should == "-1A"
+    not_supported_on :opal do
+      ("%X" % -(2 ** 64 + 5)).should == "..FEFFFFFFFFFFFFFFFB"
+    end
+  end
+
+  it "formats zero without prefix using %#x" do
+    ("%#x" % 0).should == "0"
+  end
+
+  it "formats zero without prefix using %#X" do
+    ("%#X" % 0).should == "0"
+  end
+
+  %w(b d i o u x X).each do |f|
+    format = "%" + f
+
+    it "behaves as if calling Kernel#Integer for #{format} argument, if it does not respond to #to_ary" do
+      (format % "10").should == (format % Kernel.Integer("10"))
+      (format % "0x42").should == (format % Kernel.Integer("0x42"))
+      (format % "0b1101").should == (format % Kernel.Integer("0b1101"))
+      (format % "0b1101_0000").should == (format % Kernel.Integer("0b1101_0000"))
+      (format % "0777").should == (format % Kernel.Integer("0777"))
+      lambda {
+        # see [ruby-core:14139] for more details
+        (format % "0777").should == (format % Kernel.Integer("0777"))
+      }.should_not raise_error(ArgumentError)
+
+      lambda { format % "0__7_7_7" }.should raise_error(ArgumentError)
+
+      lambda { format % "" }.should raise_error(ArgumentError)
+      lambda { format % "x" }.should raise_error(ArgumentError)
+      lambda { format % "5x" }.should raise_error(ArgumentError)
+      lambda { format % "08" }.should raise_error(ArgumentError)
+      lambda { format % "0b2" }.should raise_error(ArgumentError)
+      lambda { format % "123__456" }.should raise_error(ArgumentError)
+
+      obj = mock('5')
+      obj.should_receive(:to_i).and_return(5)
+      (format % obj).should == (format % 5)
+
+      obj = mock('6')
+      obj.stub!(:to_i).and_return(5)
+      obj.should_receive(:to_int).and_return(6)
+      (format % obj).should == (format % 6)
+    end
+  end
+
+  %w(e E f g G).each do |f|
+    format = "%" + f
+
+    it "tries to convert the passed argument to an Array using #to_ary" do
+      obj = mock('3.14')
+      obj.should_receive(:to_ary).and_return([3.14])
+      (format % obj).should == (format % [3.14])
+    end
+
+    it "behaves as if calling Kernel#Float for #{format} arguments, when the passed argument does not respond to #to_ary" do
+      (format % 10).should == (format % 10.0)
+      (format % "-10.4e-20").should == (format % -10.4e-20)
+      (format % ".5").should == (format % 0.5)
+      (format % "-.5").should == (format % -0.5)
+      # Something's strange with this spec:
+      # it works just fine in individual mode, but not when run as part of a group
+      (format % "10_1_0.5_5_5").should == (format % 1010.555)
+
+      (format % "0777").should == (format % 777)
+
+      lambda { format % "" }.should raise_error(ArgumentError)
+      lambda { format % "x" }.should raise_error(ArgumentError)
+      lambda { format % "." }.should raise_error(ArgumentError)
+      lambda { format % "10." }.should raise_error(ArgumentError)
+      lambda { format % "5x" }.should raise_error(ArgumentError)
+      lambda { format % "0b1" }.should raise_error(ArgumentError)
+      lambda { format % "10e10.5" }.should raise_error(ArgumentError)
+      lambda { format % "10__10" }.should raise_error(ArgumentError)
+      lambda { format % "10.10__10" }.should raise_error(ArgumentError)
+
+      obj = mock('5.0')
+      obj.should_receive(:to_f).and_return(5.0)
+      (format % obj).should == (format % 5.0)
+    end
+
+    it "behaves as if calling Kernel#Float for #{format} arguments, when the passed argument is hexadecimal string" do
+      (format % "0xA").should == (format % 0xA)
+    end
+
+    it "doesn't taint the result for #{format} when argument is tainted" do
+      (format % "5".taint).tainted?.should == false
+    end
+  end
+
+  describe "when format string contains %{} sections" do
+    it "replaces %{} sections with values from passed-in hash" do
+      ("%{foo}bar" % {foo: 'oof'}).should == "oofbar"
+    end
+
+    it "raises KeyError if key is missing from passed-in hash" do
+      lambda {"%{foo}" % {}}.should raise_error(KeyError)
+    end
+
+    it "should raise ArgumentError if no hash given" do
+      lambda {"%{foo}" % []}.should raise_error(ArgumentError)
+    end
+  end
+
+  describe "when format string contains %<> formats" do
+    it "uses the named argument for the format's value" do
+      ("%<foo>d" % {foo: 1}).should == "1"
+    end
+
+    it "raises KeyError if key is missing from passed-in hash" do
+      lambda {"%<foo>d" % {}}.should raise_error(KeyError)
+    end
+
+    it "should raise ArgumentError if no hash given" do
+      lambda {"%<foo>" % []}.should raise_error(ArgumentError)
+    end
+  end
+end
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