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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Kernel#srand" do
before :each do
@seed = srand
end
after :each do
srand(@seed)
end
it "is a private method" do
Kernel.should have_private_instance_method(:srand)
end
it "returns the previous seed value" do
srand(10)
srand(20).should == 10
end
it "returns the system-initialized seed value on the first call" do
ruby_exe('print srand(10)', options: '--disable-gems').should =~ /\A\d+\z/
end
it "seeds the RNG correctly and repeatably" do
srand(10)
x = rand
srand(10)
rand.should == x
end
it "defaults number to a random value" do
-> { srand }.should_not raise_error
srand.should_not == 0
end
it "accepts and uses a seed of 0" do
srand(0)
srand.should == 0
end
it "accepts a negative seed" do
srand(-17)
srand.should == -17
end
it "accepts an Integer as a seed" do
srand(0x12345678901234567890)
srand.should == 0x12345678901234567890
end
it "calls #to_int on seed" do
srand(3.8)
srand.should == 3
s = mock('seed')
s.should_receive(:to_int).and_return 0
srand(s)
end
it "raises a TypeError when passed nil" do
-> { srand(nil) }.should raise_error(TypeError)
end
it "raises a TypeError when passed a String" do
-> { srand("7") }.should raise_error(TypeError)
end
end
describe "Kernel.srand" do
it "needs to be reviewed for spec completeness"
end
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