diff --git a/test/unit/aquarius/Aquarius.test.ts b/test/unit/aquarius/Aquarius.test.ts
index e9ff8f9..542a3eb 100644
--- a/test/unit/aquarius/Aquarius.test.ts
+++ b/test/unit/aquarius/Aquarius.test.ts
@@ -157,4 +157,38 @@ describe('Aquarius', () => {
             assert(restrieveResult.id === storageResult.id)
         })
     })
+
+    describe('#updateDDO()', () => {
+        const did: DID = DID.generate()
+        const ddo: DDO = new DDO({
+            id: did.getId(),
+            publicKey: [
+                {
+                    id: 'hello',
+                    type: 'Ed25519VerificationKey2018',
+                    owner: '0xOwner'
+                }
+            ]
+        })
+
+        it('should store a ddo', async () => {
+            spy.on(aquarius.fetch, 'post', () => reponsify(ddo))
+            const result: DDO = await aquarius.storeDDO(ddo)
+            assert(result)
+            assert(result.id === ddo.id)
+        })
+
+        it('should update a ddo', async () => {
+            const newOwner = '0xhello'
+            const newDdo = ddo
+            newDdo.publicKey[0].owner = newOwner
+
+            spy.on(aquarius.fetch, 'put', () => reponsify(newDdo))
+
+            const updateResult: DDO = await aquarius.updateDDO(did, newDdo)
+            assert(updateResult)
+            assert(updateResult.id === ddo.id)
+            assert(updateResult.publicKey[0].owner === newOwner)
+        })
+    })
 })