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diff --git a/spec/ruby/library/securerandom/random_number_spec.rb b/spec/ruby/library/securerandom/random_number_spec.rb
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+++ b/spec/ruby/library/securerandom/random_number_spec.rb
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+require_relative '../../spec_helper'
+require_relative '../../core/random/shared/rand'
+
+require 'securerandom'
+
+describe "SecureRandom.random_number" do
+  it_behaves_like :random_number, :rand, SecureRandom
+  it_behaves_like :random_number, :random_number, SecureRandom
+
+  it "generates a random positive number smaller then the positive integer argument" do
+    (1..64).each do |idx|
+      num = SecureRandom.random_number(idx)
+      num.should.is_a?(Integer)
+      0.should <= num
+      num.should < idx
+    end
+  end
+
+  it "generates a random (potentially bignum) integer value for bignum argument" do
+    max = 12345678901234567890
+    11.times do
+      num = SecureRandom.random_number max
+      num.should.is_a?(Integer)
+      0.should <= num
+      num.should < max
+    end
+  end
+
+  it "generates a random float number between 0.0 and 1.0 if no argument provided" do
+    64.times do
+      num = SecureRandom.random_number
+      num.should.is_a?(Float)
+      0.0.should <= num
+      num.should < 1.0
+    end
+  end
+
+  it "generates a random value in given (integer) range limits" do
+    64.times do
+      num = SecureRandom.random_number 11...13
+      num.should.is_a?(Integer)
+      11.should <= num
+      num.should < 13
+    end
+  end
+
+  it "generates a random value in given big (integer) range limits" do
+    lower = 12345678901234567890
+    upper = 12345678901234567890 + 5
+    32.times do
+      num = SecureRandom.random_number lower..upper
+      num.should.is_a?(Integer)
+      lower.should <= num
+      num.should <= upper
+    end
+  end
+
+  it "generates a random value in given (float) range limits" do
+    64.times do
+      num = SecureRandom.random_number 0.6..0.9
+      num.should.is_a?(Float)
+      0.6.should <= num
+      num.should <= 0.9
+    end
+  end
+
+  it "generates a random float number between 0.0 and 1.0 if argument is negative" do
+    num = SecureRandom.random_number(-10)
+    num.should.is_a?(Float)
+    0.0.should <= num
+    num.should < 1.0
+  end
+
+  it "generates a random float number between 0.0 and 1.0 if argument is negative float" do
+    num = SecureRandom.random_number(-11.1)
+    num.should.is_a?(Float)
+    0.0.should <= num
+    num.should < 1.0
+  end
+
+  it "generates different float numbers with subsequent invocations" do
+    # quick and dirty check, but good enough
+    values = []
+    256.times do
+      val = SecureRandom.random_number
+      # make sure the random values are not repeating
+      values.should_not.include?(val)
+      values << val
+    end
+  end
+
+  it "raises ArgumentError if the argument is non-numeric" do
+    -> {
+      SecureRandom.random_number(Object.new)
+    }.should.raise(ArgumentError)
+  end
+end