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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
39 lines
1.3 KiB
Ruby
39 lines
1.3 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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describe "Random.srand" do
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it "returns an arbitrary seed if .srand wasn't called previously with an argument and no argument is supplied this time" do
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Random.srand # Reset to random seed in case .srand was called previously
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Random.srand.should_not == Random.srand
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end
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it "returns the previous argument to .srand if one was given and no argument is supplied" do
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Random.srand 34
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Random.srand.should == 34
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end
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it "returns an arbitrary seed if .srand wasn't called previously with an argument and 0 is supplied this time" do
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Random.srand # Reset to random seed in case .srand was called previously
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Random.srand(0).should_not == Random.srand(0)
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end
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it "returns the previous argument to .srand if one was given and 0 is supplied" do
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Random.srand 34
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Random.srand(0).should == 34
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end
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it "seeds Random.rand such that its return value is deterministic" do
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Random.srand 176542
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a = 20.times.map { Random.rand }
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Random.srand 176542
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b = 20.times.map { Random.rand }
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a.should == b
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end
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it "seeds Kernel.rand such that its return value is deterministic" do
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Random.srand 176542
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a = 20.times.map { Kernel.rand }
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Random.srand 176542
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b = 20.times.map { Kernel.rand }
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a.should == b
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end
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end
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