diff --git a/backend/src/graphql/resolver/ContributionMessageResolver.test.ts b/backend/src/graphql/resolver/ContributionMessageResolver.test.ts
index dcf7d983e..bf61da47f 100644
--- a/backend/src/graphql/resolver/ContributionMessageResolver.test.ts
+++ b/backend/src/graphql/resolver/ContributionMessageResolver.test.ts
@@ -3,13 +3,19 @@
 
 import { cleanDB, resetToken, testEnvironment } from '@test/helpers'
 import { GraphQLError } from 'graphql'
-import { createContributionMessage } from '@/seeds/graphql/mutations'
+import {
+  adminCreateContributionMessage,
+  createContribution,
+  createContributionMessage,
+} from '@/seeds/graphql/mutations'
 import { listContributionMessages, login } from '@/seeds/graphql/queries'
 import { userFactory } from '@/seeds/factory/user'
 import { bibiBloxberg } from '@/seeds/users/bibi-bloxberg'
+import { peterLustig } from '@/seeds/users/peter-lustig'
 
 let mutate: any, query: any, con: any
 let testEnv: any
+let result: any
 
 beforeAll(async () => {
   testEnv = await testEnvironment()
@@ -25,6 +31,99 @@ afterAll(async () => {
 })
 
 describe('ContributionMessageResolver', () => {
+  describe('adminCreateContributionMessage', () => {
+    describe('unauthenticated', () => {
+      it('returns an error', async () => {
+        await expect(
+          mutate({
+            mutation: adminCreateContributionMessage,
+            variables: { contributionId: 1, message: 'This is a test message' },
+          }),
+        ).resolves.toEqual(
+          expect.objectContaining({
+            errors: [new GraphQLError('401 Unauthorized')],
+          }),
+        )
+      })
+    })
+
+    describe('authenticated', () => {
+      beforeAll(async () => {
+        await userFactory(testEnv, bibiBloxberg)
+        await userFactory(testEnv, peterLustig)
+        await query({
+          query: login,
+          variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
+        })
+        result = await mutate({
+          mutation: createContribution,
+          variables: {
+            amount: 100.0,
+            memo: 'Test env contribution',
+            creationDate: new Date().toString(),
+          },
+        })
+        await query({
+          query: login,
+          variables: { email: 'peter@lustig.de', password: 'Aa12345_' },
+        })
+      })
+
+      afterAll(async () => {
+        await cleanDB()
+        resetToken()
+      })
+
+      describe('input not valid', () => {
+        it('throws error when contribution does not exist', async () => {
+          await expect(
+            mutate({
+              mutation: adminCreateContributionMessage,
+              variables: {
+                contributionId: -1,
+                message: 'Test',
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [
+                new GraphQLError(
+                  'ContributionMessage was not successful: Error: Contribution not found',
+                ),
+              ],
+            }),
+          )
+        })
+      })
+
+      describe('valid input', () => {
+        it('creates ContributionMessage', async () => {
+          await expect(
+            mutate({
+              mutation: adminCreateContributionMessage,
+              variables: {
+                contributionId: result.data.createContribution.id,
+                message: 'Admin Test',
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              data: {
+                adminCreateContributionMessage: expect.objectContaining({
+                  id: expect.any(Number),
+                  message: 'Admin Test',
+                  type: 'DIALOG',
+                  userFirstName: 'Peter',
+                  userLastName: 'Lustig',
+                }),
+              },
+            }),
+          )
+        })
+      })
+    })
+  })
+
   describe('createContributionMessage', () => {
     describe('unauthenticated', () => {
       it('returns an error', async () => {
@@ -44,10 +143,19 @@ describe('ContributionMessageResolver', () => {
     describe('authenticated', () => {
       beforeAll(async () => {
         await userFactory(testEnv, bibiBloxberg)
+        await userFactory(testEnv, peterLustig)
         await query({
           query: login,
           variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
         })
+        result = await mutate({
+          mutation: createContribution,
+          variables: {
+            amount: 100.0,
+            memo: 'Test env contribution',
+            creationDate: new Date().toString(),
+          },
+        })
       })
 
       afterAll(async () => {
@@ -75,6 +183,68 @@ describe('ContributionMessageResolver', () => {
             }),
           )
         })
+
+        it('throws error when other user tries to send createContributionMessage', async () => {
+          await query({
+            query: login,
+            variables: { email: 'peter@lustig.de', password: 'Aa12345_' },
+          })
+          await expect(
+            mutate({
+              mutation: createContributionMessage,
+              variables: {
+                contributionId: result.data.createContribution.id,
+                message: 'Test',
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              errors: [
+                new GraphQLError(
+                  'ContributionMessage was not successful: Error: Can not send message to contribution of another user',
+                ),
+              ],
+            }),
+          )
+        })
+      })
+
+      describe('valid input', () => {
+        beforeAll(async () => {
+          await query({
+            query: login,
+            variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
+          })
+        })
+
+        afterAll(async () => {
+          await cleanDB()
+          resetToken()
+        })
+
+        it('creates ContributionMessage', async () => {
+          await expect(
+            mutate({
+              mutation: createContributionMessage,
+              variables: {
+                contributionId: result.data.createContribution.id,
+                message: 'Test',
+              },
+            }),
+          ).resolves.toEqual(
+            expect.objectContaining({
+              data: {
+                createContributionMessage: expect.objectContaining({
+                  id: expect.any(Number),
+                  message: 'Test',
+                  type: 'DIALOG',
+                  userFirstName: 'Bibi',
+                  userLastName: 'Bloxberg',
+                }),
+              },
+            }),
+          )
+        })
       })
     })
   })
@@ -94,5 +264,84 @@ describe('ContributionMessageResolver', () => {
         )
       })
     })
+
+    describe('authenticated', () => {
+      beforeAll(async () => {
+        await userFactory(testEnv, bibiBloxberg)
+        await userFactory(testEnv, peterLustig)
+        await query({
+          query: login,
+          variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
+        })
+        result = await mutate({
+          mutation: createContribution,
+          variables: {
+            amount: 100.0,
+            memo: 'Test env contribution',
+            creationDate: new Date().toString(),
+          },
+        })
+        await query({
+          query: login,
+          variables: { email: 'peter@lustig.de', password: 'Aa12345_' },
+        })
+        await mutate({
+          mutation: adminCreateContributionMessage,
+          variables: {
+            contributionId: result.data.createContribution.id,
+            message: 'Admin Test',
+          },
+        })
+        await query({
+          query: login,
+          variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
+        })
+        await mutate({
+          mutation: createContributionMessage,
+          variables: {
+            contributionId: result.data.createContribution.id,
+            message: 'User Test',
+          },
+        })
+      })
+
+      afterAll(async () => {
+        await cleanDB()
+        resetToken()
+      })
+
+      it('returns a list of contributionmessages', async () => {
+        await expect(
+          mutate({
+            mutation: listContributionMessages,
+            variables: { contributionId: result.data.createContribution.id },
+          }),
+        ).resolves.toEqual(
+          expect.objectContaining({
+            data: {
+              listContributionMessages: {
+                count: 2,
+                messages: expect.arrayContaining([
+                  expect.objectContaining({
+                    id: expect.any(Number),
+                    message: 'Admin Test',
+                    type: 'DIALOG',
+                    userFirstName: 'Peter',
+                    userLastName: 'Lustig',
+                  }),
+                  expect.objectContaining({
+                    id: expect.any(Number),
+                    message: 'User Test',
+                    type: 'DIALOG',
+                    userFirstName: 'Bibi',
+                    userLastName: 'Bloxberg',
+                  }),
+                ]),
+              },
+            },
+          }),
+        )
+      })
+    })
   })
 })