1 files changed, 53 insertions, 0 deletions
diff --git a/spec/ruby/library/securerandom/random_bytes_spec.rb b/spec/ruby/library/securerandom/random_bytes_spec.rb
new file mode 100644
index 0000000000..4e30a53163
--- /dev/null
+++ b/spec/ruby/library/securerandom/random_bytes_spec.rb
@@ -0,0 +1,53 @@
+require_relative '../../spec_helper'
+require_relative '../../core/random/shared/bytes'
+
+require 'securerandom'
+
+describe "SecureRandom.random_bytes" do
+  it_behaves_like :random_bytes, :random_bytes, SecureRandom
+
+  it "generates a random binary string of length 16 if no argument is provided" do
+    bytes = SecureRandom.random_bytes
+    bytes.should.is_a?(String)
+    bytes.length.should == 16
+  end
+
+  it "generates a random binary string of length 16 if argument is nil" do
+    bytes = SecureRandom.random_bytes(nil)
+    bytes.should.is_a?(String)
+    bytes.length.should == 16
+  end
+
+  it "generates a random binary string of specified length" do
+    (1..64).each do |idx|
+      bytes = SecureRandom.random_bytes(idx)
+      bytes.should.is_a?(String)
+      bytes.length.should == idx
+    end
+
+    SecureRandom.random_bytes(2.2).length.should.eql?(2)
+  end
+
+  it "generates different binary strings with subsequent invocations" do
+    # quick and dirty check, but good enough
+    values = []
+    256.times do
+      val = SecureRandom.random_bytes
+      # make sure the random bytes are not repeating
+      values.include?(val).should == false
+      values << val
+    end
+  end
+
+  it "raises ArgumentError on negative arguments" do
+    -> {
+      SecureRandom.random_bytes(-1)
+    }.should.raise(ArgumentError)
+  end
+
+  it "tries to convert the passed argument to an Integer using #to_int" do
+    obj = mock("to_int")
+    obj.should_receive(:to_int).and_return(5)
+    SecureRandom.random_bytes(obj).size.should.eql?(5)
+  end
+end