diff --git a/test/monger/test/updating_test.clj b/test/monger/test/updating_test.clj
index f039dd5..00ec2e8 100644
--- a/test/monger/test/updating_test.clj
+++ b/test/monger/test/updating_test.clj
@@ -5,13 +5,13 @@
             org.bson.types.ObjectId
             java.util.Date)
   (:require [monger core util]
-            [monger.collection :as mgcol]
-            [monger.result     :as mgres]
-            [monger.conversion :as mgcnv]
+            [monger.collection :as mc]
+            [monger.result     :as mr]
             [monger.test.helper :as helper])
   (:use clojure.test
         monger.operators
-        monger.test.fixtures))
+        monger.test.fixtures
+        [monger.conversion :only [to-db-object]]))
 
 (helper/connect!)
 
@@ -28,10 +28,10 @@
         date         (Date.)
         doc          { :created-at date, :data-store "MongoDB", :language "Clojure", :_id doc-id }
         modified-doc { :created-at date, :data-store "MongoDB", :language "Erlang",  :_id doc-id }]
-    (mgcol/insert collection doc)
-    (is (= (doc (mgcol/find-by-id collection doc-id))))
-    (mgcol/update collection { :_id doc-id } { :language "Erlang" })
-    (is (= (modified-doc (mgcol/find-by-id collection doc-id))))))
+    (mc/insert collection doc)
+    (is (= (doc (mc/find-by-id collection doc-id))))
+    (mc/update collection { :_id doc-id } { :language "Erlang" })
+    (is (= (modified-doc (mc/find-by-id collection doc-id))))))
 
 (deftest update-document-by-id-without-upsert-using-update-by-id
   (let [collection "libraries"
@@ -39,10 +39,10 @@
         date         (Date.)
         doc          { :created-at date, :data-store "MongoDB", :language "Clojure", :_id doc-id }
         modified-doc { :created-at date, :data-store "MongoDB", :language "Erlang",  :_id doc-id }]
-    (mgcol/insert collection doc)
-    (is (= (doc (mgcol/find-by-id collection doc-id))))
-    (mgcol/update-by-id collection doc-id { :language "Erlang" })
-    (is (= (modified-doc (mgcol/find-by-id collection doc-id))))))
+    (mc/insert collection doc)
+    (is (= (doc (mc/find-by-id collection doc-id))))
+    (mc/update-by-id collection doc-id { :language "Erlang" })
+    (is (= (modified-doc (mc/find-by-id collection doc-id))))))
 
 (deftest update-nested-document-fields-without-upsert-using-update-by-id
   (let [collection "libraries"
@@ -50,39 +50,39 @@
         date         (Date.)
         doc          { :created-at date :data-store "MongoDB" :language { :primary "Clojure" } :_id doc-id }
         modified-doc { :created-at date :data-store "MongoDB" :language { :primary "Erlang"  } :_id doc-id }]
-    (mgcol/insert collection doc)
-    (is (= (doc (mgcol/find-by-id collection doc-id))))
-    (mgcol/update-by-id collection doc-id { $set { "language.primary" "Erlang" }})
-    (is (= (modified-doc (mgcol/find-by-id collection doc-id))))))
+    (mc/insert collection doc)
+    (is (= (doc (mc/find-by-id collection doc-id))))
+    (mc/update-by-id collection doc-id { $set { "language.primary" "Erlang" }})
+    (is (= (modified-doc (mc/find-by-id collection doc-id))))))
 
 
 (deftest update-multiple-documents
   (let [collection "libraries"]
-    (mgcol/insert collection { :language "Clojure", :name "monger" })
-    (mgcol/insert collection { :language "Clojure", :name "langohr" })
-    (mgcol/insert collection { :language "Clojure", :name "incanter" })
-    (mgcol/insert collection { :language "Scala",   :name "akka" })
-    (is (= 3 (mgcol/count collection { :language "Clojure" })))
-    (is (= 1 (mgcol/count collection { :language "Scala"   })))
-    (is (= 0 (mgcol/count collection { :language "Python"  })))
-    (mgcol/update collection { :language "Clojure" } { $set { :language "Python" } } :multi true)
-    (is (= 0 (mgcol/count collection { :language "Clojure" })))
-    (is (= 1 (mgcol/count collection { :language "Scala"   })))
-    (is (= 3 (mgcol/count collection { :language "Python"  })))))
+    (mc/insert collection { :language "Clojure", :name "monger" })
+    (mc/insert collection { :language "Clojure", :name "langohr" })
+    (mc/insert collection { :language "Clojure", :name "incanter" })
+    (mc/insert collection { :language "Scala",   :name "akka" })
+    (is (= 3 (mc/count collection { :language "Clojure" })))
+    (is (= 1 (mc/count collection { :language "Scala"   })))
+    (is (= 0 (mc/count collection { :language "Python"  })))
+    (mc/update collection { :language "Clojure" } { $set { :language "Python" } } :multi true)
+    (is (= 0 (mc/count collection { :language "Clojure" })))
+    (is (= 1 (mc/count collection { :language "Scala"   })))
+    (is (= 3 (mc/count collection { :language "Python"  })))))
 
 
 (deftest save-a-new-document
   (let [collection "people"
         document       { :name "Joe", :age 30 }]
-    (is (monger.result/ok? (mgcol/save "people" document)))
-    (is (= 1 (mgcol/count collection)))))
+    (is (monger.result/ok? (mc/save "people" document)))
+    (is (= 1 (mc/count collection)))))
 
 
 (deftest save-a-new-basic-db-object
   (let [collection "people"
-        doc        (mgcnv/to-db-object { :name "Joe", :age 30 })]
+        doc        (to-db-object { :name "Joe", :age 30 })]
     (is (nil? (monger.util/get-id doc)))
-    (mgcol/save monger.core/*mongodb-database* "people" doc WriteConcern/SAFE)
+    (mc/save monger.core/*mongodb-database* "people" doc WriteConcern/SAFE)
     (is (not (nil? (monger.util/get-id doc))))))
 
 
@@ -91,21 +91,32 @@
   (let [collection "people"
         doc-id            "people-1"
         document          { :_id doc-id, :name "Joe",   :age 30 }]
-    (is (monger.result/ok? (mgcol/insert "people" document)))
-    (is (= 1 (mgcol/count collection)))
-    (mgcol/save collection { :_id doc-id, :name "Alan", :age 40 })
-    (is (= 1 (mgcol/count collection { :name "Alan", :age 40 })))))
+    (is (monger.result/ok? (mc/insert "people" document)))
+    (is (= 1 (mc/count collection)))
+    (mc/save collection { :_id doc-id, :name "Alan", :age 40 })
+    (is (= 1 (mc/count collection { :name "Alan", :age 40 })))))
 
 
 (deftest set-an-attribute-on-existing-document-using-update
   (let [collection "people"
         doc-id            (monger.util/object-id)
         document          { :_id doc-id, :name "Joe",   :age 30 }]
-    (is (monger.result/ok? (mgcol/insert "people" document)))
-    (is (= 1 (mgcol/count collection)))
-    (is (= 0 (mgcol/count collection { :has_kids true })))
-    (mgcol/update collection { :_id doc-id } { $set { :has_kids true } })
-    (is (= 1 (mgcol/count collection { :has_kids true })))))
+    (is (monger.result/ok? (mc/insert "people" document)))
+    (is (= 1 (mc/count collection)))
+    (is (= 0 (mc/count collection { :has_kids true })))
+    (mc/update collection { :_id doc-id } { $set { :has_kids true } })
+    (is (= 1 (mc/count collection { :has_kids true })))))
+
+
+(deftest  increment-multiple-fields-using-exists-operator-and-update
+  (let [collection "matches"
+        doc-id     (monger.util/object-id)
+        document   { :_id doc-id :abc 0 :def 10 }]
+    (mc/remove collection)
+    (is (monger.result/ok? (mc/insert collection document)))
+    (is (= 1 (mc/count collection {:abc {$exists true} :def {$exists true}})))
+    (mc/update collection {:abc {$exists true} :def {$exists true}} {$inc {:abc 1 :def 0}})
+    (is (= 1 (mc/count collection { :abc 1 })))))
 
 
 
@@ -115,9 +126,9 @@
         date         (Date.)
         doc          { :created-at date, :data-store "MongoDB", :language "Clojure", :_id doc-id }
         modified-doc { :created-at date, :data-store "MongoDB", :language "Erlang",  :_id doc-id }]
-    (is (not (monger.result/updated-existing? (mgcol/update collection { :language "Clojure" } doc :upsert true))))
-    (is (= 1 (mgcol/count collection)))
-    (is (monger.result/updated-existing? (mgcol/update collection { :language "Clojure" } modified-doc :multi false :upsert true)))
-    (is (= 1 (mgcol/count collection)))
-    (is (= (modified-doc (mgcol/find-by-id collection doc-id))))
-    (mgcol/remove collection)))
+    (is (not (monger.result/updated-existing? (mc/update collection { :language "Clojure" } doc :upsert true))))
+    (is (= 1 (mc/count collection)))
+    (is (monger.result/updated-existing? (mc/update collection { :language "Clojure" } modified-doc :multi false :upsert true)))
+    (is (= 1 (mc/count collection)))
+    (is (= (modified-doc (mc/find-by-id collection doc-id))))
+    (mc/remove collection)))