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Diffstat (limited to 'spec/rubyspec/core/kernel/srand_spec.rb')
-rw-r--r-- | spec/rubyspec/core/kernel/srand_spec.rb | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/spec/rubyspec/core/kernel/srand_spec.rb b/spec/rubyspec/core/kernel/srand_spec.rb new file mode 100644 index 0000000000..33f99f5ac4 --- /dev/null +++ b/spec/rubyspec/core/kernel/srand_spec.rb @@ -0,0 +1,61 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Kernel.srand" do + 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 "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 + lambda { 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 a Bignum 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 + lambda { srand(nil) }.should raise_error(TypeError) + end + + it "raises a TypeError when passed a String" do + lambda { srand("7") }.should raise_error(TypeError) + end +end + +describe "Kernel#srand" do + it "needs to be reviewed for spec completeness" +end |