Integer#{any|all|no}_bits: Fix coercion. Add specs [#12753]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61305 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/core/integer/allbits_spec.rb

@@ -0,0 +1,37 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#allbits?" do
+  it "returns true iff all the bits of the argument are set in the receiver" do
+    42.allbits?(42).should == true
+    0b1010_1010.allbits?(0b1000_0010).should == true
+    0b1010_1010.allbits?(0b1000_0001).should == false
+    0b1000_0010.allbits?(0b1010_1010).should == false
+    (0b1010_1010 | bignum_value).allbits?(0b1000_0010 | bignum_value).should == true
+    (0b1010_1010 | bignum_value).allbits?(0b1000_0001 | bignum_value).should == false
+    (0b1000_0010 | bignum_value).allbits?(0b1010_1010 | bignum_value).should == false
+  end
+
+  it "handles negative values using two's complement notation" do
+    (~0b1).allbits?(42).should == true
+    (-42).allbits?(-42).should == true
+    (~0b1010_1010).allbits?(~0b1110_1011).should == true
+    (~0b1010_1010).allbits?(~0b1000_0010).should == false
+    (~(0b1010_1010 | bignum_value)).allbits?(~(0b1110_1011 | bignum_value)).should == true
+    (~(0b1010_1010 | bignum_value)).allbits?(~(0b1000_0010 | bignum_value)).should == false
+  end
+
+  it "coerces the rhs using to_int" do
+    obj = mock("the int 0b10")
+    obj.should_receive(:to_int).and_return(0b10)
+    0b110.allbits?(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.allbits?(obj)
+    }.should raise_error(TypeError)
+    lambda { 13.allbits?("10")    }.should raise_error(TypeError)
+    lambda { 13.allbits?(:symbol) }.should raise_error(TypeError)
+  end
+end