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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
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