Allow the redis client instance to be passed in.

lib/bloomfilter/counting_redis.rb

@@ -10,7 +10,7 @@ def initialize(opts = {})
         :ttl => false,
         :server => {}
       }.merge opts
-      @db = ::Redis.new(@opts[:server])
+      @db = @opts.delete(:db) || ::Redis.new(@opts[:server])
     end
 
     def insert(key, ttl=nil)

lib/bloomfilter/redis.rb

@@ -10,7 +10,7 @@ def initialize(opts = {})
         :eager  => false,
         :server => {}
       }.merge opts
-      @db = ::Redis.new(@opts[:server])
+      @db = @opts.delete(:db) || ::Redis.new(@opts[:server])
 
       if @opts[:eager]
         @db.setbit @opts[:namespace], @opts[:size]+1, 1

spec/counting_redis_spec.rb

@@ -52,5 +52,12 @@
     it "should connect to remote redis server" do
       lambda { CountingRedis.new }.should_not raise_error
     end
+
+    it "should allow redis client instance to be passed in" do
+      redis_client = mock Redis
+      bf = BloomFilter::CountingRedis.new(:db => redis_client)
+      bf.instance_variable_get(:@db).should be == redis_client
+    end
+
   end
 end

spec/redis_spec.rb

@@ -46,6 +46,12 @@
       lambda { BloomFilter::Redis.new }.should_not raise_error
     end
 
+    it "should allow redis client instance to be passed in" do
+      redis_client = mock ::Redis
+      bf = BloomFilter::Redis.new(:db => redis_client)
+      bf.instance_variable_get(:@db).should be == redis_client
+    end
+
     it "should allow namespaced BloomFilters" do
       bf1 = BloomFilter::Redis.new(:namespace => :a)
       bf2 = BloomFilter::Redis.new(:namespace => :b)