1 files changed, 73 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/srand_spec.rb b/spec/ruby/core/kernel/srand_spec.rb
new file mode 100644
index 0000000000..cbc3a7f4b8
--- /dev/null
+++ b/spec/ruby/core/kernel/srand_spec.rb
@@ -0,0 +1,73 @@
+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.private_instance_methods(false).should.include?(: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
+    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(TypeError)
+  end
+
+  it "raises a TypeError when passed a String" do
+    -> { srand("7") }.should.raise(TypeError)
+  end
+end
+
+describe "Kernel.srand" do
+  it "needs to be reviewed for spec completeness"
+end