Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 50 insertions, 0 deletions

diff --git a/spec/rubyspec/core/bignum/bit_and_spec.rb b/spec/rubyspec/core/bignum/bit_and_spec.rb
new file mode 100644
index 0000000000..6eca0e56f0
--- /dev/null
+++ b/spec/rubyspec/core/bignum/bit_and_spec.rb
@@ -0,0 +1,50 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Bignum#&" do
+  before :each do
+    @bignum = bignum_value(5)
+  end
+
+  it "returns self bitwise AND other" do
+    @bignum = bignum_value(5)
+    (@bignum & 3).should == 1
+    (@bignum & 52).should == 4
+    (@bignum & bignum_value(9921)).should == 9223372036854775809
+
+    ((2*bignum_value) & 1).should == 0
+    ((2*bignum_value) & (2*bignum_value)).should == 18446744073709551616
+  end
+
+  it "returns self bitwise AND other when one operand is negative" do
+    ((2*bignum_value) & -1).should == 18446744073709551616
+    ((4*bignum_value) & -1).should == 36893488147419103232
+    (@bignum & -0xffffffffffffff5).should == 9223372036854775809
+    (@bignum & -@bignum).should == 1
+    (@bignum & -0x8000000000000000).should == 9223372036854775808
+  end
+
+  it "returns self bitwise AND other when both operands are negative" do
+    (-@bignum & -0x4000000000000005).should == -13835058055282163717
+    (-@bignum & -@bignum).should == -9223372036854775813
+    (-@bignum & -0x4000000000000000).should == -13835058055282163712
+  end
+
+  it "returns self bitwise AND other when both are negative and a multiple in bitsize of Fixnum::MIN" do
+    val = - ((1 << 93) - 1)
+    (val & val).should == val
+
+    val = - ((1 << 126) - 1)
+    (val & val).should == val
+  end
+
+  it "raises a TypeError when passed a Float" do
+    lambda { (@bignum & 3.4) }.should raise_error(TypeError)
+  end
+
+  it "raises a TypeError and does not call #to_int when defined on an object" do
+    obj = mock("bignum bit and")
+    obj.should_not_receive(:to_int)
+
+    lambda { @bignum & obj }.should raise_error(TypeError)
+  end
+end