First rspec test...

.rspec

@@ -0,0 +1,2 @@
+--color
+--require spec_helper

hiera-redis.gemspec

@@ -13,6 +13,7 @@ Gem::Specification.new do |s|
   s.license = 'GPL-3'
   s.add_dependency 'hiera', '>= 1.0'
   s.add_dependency 'redis', '>= 3.2'
+  s.add_development_dependency 'rspec', '~> 3.3'
   s.files = Dir['lib/**/*.rb']
   s.files += ['COPYING']
 end

spec/hiera.yaml

@@ -0,0 +1,4 @@
+:backends:
+  - redis
+:redis:
+  :port: 234

spec/hiera_redis_spec.rb

@@ -0,0 +1,21 @@
+require 'hiera'
+require 'redis'
+
+describe 'hiera-redis' do
+  let(:hiera) do
+    Hiera.new(config: {
+                default: nil,
+                backends: ['redis'],
+                scope: {},
+                key: nil,
+                verbose: false,
+                resolution_type: :priority,
+                format: :ruby })
+  end
+  let(:redis) { Redis.new }
+
+  it 'works' do
+    redis.set('common:foo', 'bar')
+    expect(hiera.lookup('foo', '', '')).to eq('bar')
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1,16 @@
+RSpec.configure do |config|
+  config.expect_with :rspec do |expectations|
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  config.warnings = true
+  config.order = :random
+  Kernel.srand config.seed
+end