diff --git a/src/test/cljc/dda/c4k_common/postgres_test.cljc b/src/test/cljc/dda/c4k_common/postgres_test.cljc
index 4b698c0..6d4bbe5 100644
--- a/src/test/cljc/dda/c4k_common/postgres_test.cljc
+++ b/src/test/cljc/dda/c4k_common/postgres_test.cljc
@@ -3,6 +3,7 @@
    #?(:clj [clojure.test :refer [deftest is are testing run-tests]]
       :cljs [cljs.test :refer-macros [deftest is are testing run-tests]])
    [clojure.spec.test.alpha :as st]
+   [dda.c4k-common.common-test :as ct]
    [dda.c4k-common.postgres :as cut]))
 
 (st/instrument `cut/generate-config)
@@ -27,6 +28,13 @@
          (:data (cut/generate-config {:db-name "test"}))))
   )
 
+(deftest should-generate-config-diff
+  (is (= {:postgres-db-c1 "postgres",
+          :postgres-db-c2 "test",
+          :postgresql.conf-c1 "max_connections = 100\nwork_mem = 4MB\nshared_buffers = 512MB\n",
+          :postgresql.conf-c2 "max_connections = 700\nwork_mem = 3MB\nshared_buffers = 2048MB\n"}
+         (ct/map-diff (cut/generate-config) (cut/generate-config {:db-name "test" :postgres-size :8gb})))))
+
 (deftest should-generate-persistent-volume
   (is (= {:kind "PersistentVolume"
           :apiVersion "v1"
@@ -50,6 +58,13 @@
          (cut/generate-persistent-volume {:postgres-data-volume-path "xx"
                                           :pv-storage-size-gb 20}))))
 
+(deftest should-generate-persistent-volume-diff
+  (is (= {:storage-c1 "10Gi", :storage-c2 "20Gi",
+          :path-c1 "/var/postgres", :path-c2 "xx"}
+         (ct/map-diff (cut/generate-persistent-volume {}) 
+                        (cut/generate-persistent-volume {:postgres-data-volume-path "xx" 
+                                                         :pv-storage-size-gb 20})))))
+
 (deftest should-generate-persistent-volume-claim
   (is (= {:apiVersion "v1"
           :kind "PersistentVolumeClaim"
@@ -71,6 +86,13 @@
          (cut/generate-pvc {:pv-storage-size-gb 20
                             :pvc-storage-class-name :local-path}))))
 
+(deftest should-generate-persistent-volume-claim-diff
+  (is (= {:storageClassName-c1 "manual", :storageClassName-c2 "local-path",
+          :storage-c1 "10Gi", :storage-c2 "20Gi"}
+         (ct/map-diff (cut/generate-pvc {}) 
+                        (cut/generate-pvc {:pv-storage-size-gb 20
+                                           :pvc-storage-class-name :local-path})))))
+
 (deftest should-generate-secret
   (is (= {:apiVersion "v1"
           :kind "Secret"
@@ -106,3 +128,7 @@
              :mountPath "/var/lib/postgresql/data"}]}]
          (get-in (cut/generate-deployment {:postgres-image "postgres:14"})
                  [:spec :template :spec :containers]))))
+
+(deftest should-generate-deployment-diff
+  (is (= {:image-c1 "postgres:13", :image-c2 "postgres:14"}
+         (ct/map-diff (cut/generate-deployment) (cut/generate-deployment {:postgres-image "postgres:14"})))))
\ No newline at end of file