Added a test case in HashOperationsSpec for deleting multiple keys in a hash

Author: debasishg

src/test/scala/com/redis/HashOperationsSpec.scala

@@ -91,6 +91,17 @@ class HashOperationsSpec extends FunSpec
       val thrown = the [Exception] thrownBy { r.hincrbyfloat("hash1", "field1", 2.0e2f) }
       thrown.getMessage should include("hash value is not a valid float")
     }
+
+    it("should delete multiple keys if present on a hash") {
+      r.hset("hash100", "key1", 10.20f)
+      r.hset("hash100", "key2", 10.30f)
+      r.hset("hash100", "key3", 10.40f)
+      r.hset("hash100", "key4", 10.50f)
+      r.hset("hash100", "key5", 10.60f)
+      r.hkeys("hash100") should be(Some(List("key1", "key2", "key3", "key4", "key5")))
+      r.hdel("hash100", "key1", "key2", "key3", "key4", "key5") should equal(Some(5))
+      r.hkeys("hash100") should be(Some(List()))
+    }
   }
 
   describe("hset1") {