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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62094 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
40 lines
1 KiB
Ruby
40 lines
1 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe "Integer#even?" do
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context "fixnum" do
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it "returns true for a Fixnum when it is an even number" do
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(-2).even?.should be_true
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(-1).even?.should be_false
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0.even?.should be_true
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1.even?.should be_false
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2.even?.should be_true
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end
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it "returns true for a Bignum when it is an even number" do
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bignum_value(0).even?.should be_true
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bignum_value(1).even?.should be_false
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(-bignum_value(0)).even?.should be_true
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(-bignum_value(1)).even?.should be_false
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end
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end
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context "bignum" do
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it "returns true if self is even and positive" do
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(10000**10).even?.should be_true
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end
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it "returns true if self is even and negative" do
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(-10000**10).even?.should be_true
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end
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it "returns false if self is odd and positive" do
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(9879**976).even?.should be_false
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end
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it "returns false if self is odd and negative" do
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(-9879**976).even?.should be_false
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end
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end
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end
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