1 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/core/bignum/element_reference_spec.rb b/spec/ruby/core/bignum/element_reference_spec.rb
new file mode 100644
index 0000000000..e5ee9e15ac
--- /dev/null
+++ b/spec/ruby/core/bignum/element_reference_spec.rb
@@ -0,0 +1,30 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Bignum#[]" do
+  before :each do
+    @bignum = bignum_value(4996)
+  end
+
+  it "returns the nth bit in the binary representation of self" do
+    @bignum[2].should == 1
+    @bignum[9.2].should == 1
+    @bignum[21].should == 0
+    @bignum[0xffffffff].should == 0
+    @bignum[-0xffffffff].should == 0
+  end
+
+  it "tries to convert the given argument to an Integer using #to_int" do
+    @bignum[1.3].should == @bignum[1]
+
+    (obj = mock('2')).should_receive(:to_int).at_least(1).and_return(2)
+    @bignum[obj].should == 1
+  end
+
+  it "raises a TypeError when the given argument can't be converted to Integer" do
+    obj = mock('asdf')
+    lambda { @bignum[obj] }.should raise_error(TypeError)
+
+    obj.should_receive(:to_int).and_return("asdf")
+    lambda { @bignum[obj] }.should raise_error(TypeError)
+  end
+end