38 lines
1.1 KiB
Ruby
38 lines
1.1 KiB
Ruby
describe "Random.new" do
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it "returns a new instance of Random" do
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Random.new.should be_an_instance_of(Random)
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end
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it "uses a random seed value if none is supplied" do
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Random.new.seed.should be_an_instance_of(Bignum)
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end
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it "returns Random instances initialized with different seeds" do
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first = Random.new
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second = Random.new
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(0..20).map { first.rand } .should_not == (0..20).map { second.rand }
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end
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it "accepts an Integer seed value as an argument" do
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Random.new(2).seed.should == 2
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end
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it "accepts (and truncates) a Float seed value as an argument" do
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Random.new(3.4).seed.should == 3
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end
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it "accepts (and converts to Integer) a Rational seed value as an argument" do
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Random.new(Rational(20,2)).seed.should == 10
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end
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it "accepts (and converts to Integer) a Complex (without imaginary part) seed value as an argument" do
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Random.new(Complex(20)).seed.should == 20
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end
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it "raises a RangeError if passed a Complex (with imaginary part) seed value as an argument" do
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lambda do
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Random.new(Complex(20,2))
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end.should raise_error(RangeError)
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end
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end
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