1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/anybits_spec.rb b/spec/ruby/core/integer/anybits_spec.rb
new file mode 100644
index 0000000000..409e2e65c5
--- /dev/null
+++ b/spec/ruby/core/integer/anybits_spec.rb
@@ -0,0 +1,36 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#anybits?" do
+  it "returns true iff all the bits of the argument are set in the receiver" do
+    42.anybits?(42).should == true
+    0b1010_1010.anybits?(0b1000_0010).should == true
+    0b1010_1010.anybits?(0b1000_0001).should == true
+    0b1000_0010.anybits?(0b0010_1100).should == false
+    different_bignum = (2 * bignum_value) & (~bignum_value)
+    (0b1010_1010 | different_bignum).anybits?(0b1000_0010 | bignum_value).should == true
+    (0b1010_1010 | different_bignum).anybits?(0b0010_1100 | bignum_value).should == true
+    (0b1000_0010 | different_bignum).anybits?(0b0010_1100 | bignum_value).should == false
+  end
+
+  it "handles negative values using two's complement notation" do
+    (~42).anybits?(42).should == false
+    (-42).anybits?(-42).should == true
+    (~0b100).anybits?(~0b1).should == true
+    (~(0b100 | bignum_value)).anybits?(~(0b1 | bignum_value)).should == true
+  end
+
+  it "coerces the rhs using to_int" do
+    obj = mock("the int 0b10")
+    obj.should_receive(:to_int).and_return(0b10)
+    0b110.anybits?(obj).should == true
+  end
+
+  it "raises a TypeError when given a non-Integer" do
+    lambda {
+      (obj = mock('10')).should_receive(:coerce).any_number_of_times.and_return([42,10])
+      13.anybits?(obj)
+    }.should raise_error(TypeError)
+    lambda { 13.anybits?("10")    }.should raise_error(TypeError)
+    lambda { 13.anybits?(:symbol) }.should raise_error(TypeError)
+  end
+end