flush the entire redis database before each example

spec/counting_redis_spec.rb

@@ -5,47 +5,50 @@
 describe CountingRedis do
 
   context "use Redis for storage" do
-    it "should store data in Redis" do
-      bf = CountingRedis.new
-
-      bf.insert(:abcd)
-      bf.insert('test')
-      bf.include?('test').should be_true
-      bf.key?('test').should be_true
-
-      bf.include?('test', 'test2').should be_false
-      bf.include?('test', 'abcd').should be_true
+    context "a default CountingRedis instance" do
+      let(:bf) { CountingRedis.new }
+
+      before do
+        # clear all redis databases
+        bf.instance_variable_get(:@db).flushall
+      end
+
+      it "should store data in Redis" do
+        bf.insert(:abcd)
+        bf.insert('test')
+        bf.include?('test').should be_true
+        bf.key?('test').should be_true
+
+        bf.include?('test', 'test2').should be_false
+        bf.include?('test', 'abcd').should be_true
+      end
+
+      it "should delete keys from Redis" do
+        bf.insert('test')
+        bf.include?('test').should be_true
+
+        bf.delete('test')
+        bf.include?('test').should be_false
+      end
+
+      it "should output current stats" do
+        bf.insert('test')
+        bf.size.should == 4
+        lambda { bf.stats }.should_not raise_error
+      end
     end
-
+    
     it "should accept a TTL value for a key" do
       bf = CountingRedis.new(:ttl => 1)
-
+      bf.instance_variable_get(:@db).flushall
+
       bf.insert('test')
       bf.include?('test').should be_true
 
       sleep(2)
       bf.include?('test').should be_false
     end
 
-    it "should delete keys from Redis" do
-      bf = CountingRedis.new
-
-      bf.insert('test')
-      bf.include?('test').should be_true
-
-      bf.delete('test')
-      bf.include?('test').should be_false
-    end
-
-    it "should output current stats" do
-      bf = CountingRedis.new
-      bf.clear
-
-      bf.insert('test')
-      bf.size.should == 4
-      lambda { bf.stats }.should_not raise_error
-    end
-
     it "should connect to remote redis server" do
       lambda { CountingRedis.new }.should_not raise_error
     end

spec/redis_spec.rb

@@ -5,6 +5,11 @@
   context "use Redis bitstring for storage" do
     let(:bf) { BloomFilter::Redis.new }
 
+    before do
+      # clear all redis databases
+      bf.instance_variable_get(:@db).flushall
+    end
+
     it "should store data in Redis" do
       bf.insert(:abcd)
       bf.insert('test')