diff --git a/backend/src/graphql/resolver/AdminResolver.test.ts b/backend/src/graphql/resolver/AdminResolver.test.ts
index b5711cd57..f26fce3d8 100644
--- a/backend/src/graphql/resolver/AdminResolver.test.ts
+++ b/backend/src/graphql/resolver/AdminResolver.test.ts
@@ -139,6 +139,7 @@ describe('AdminResolver', () => {
 
         describe('user to get a new role does not exist', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({ mutation: setUserRole, variables: { userId: admin.id + 1, isAdmin: true } }),
             ).resolves.toEqual(
@@ -195,6 +196,7 @@ describe('AdminResolver', () => {
         describe('change role with error', () => {
           describe('is own role', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({ mutation: setUserRole, variables: { userId: admin.id, isAdmin: false } }),
               ).resolves.toEqual(
@@ -211,6 +213,7 @@ describe('AdminResolver', () => {
           describe('user has already role to be set', () => {
             describe('to admin', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 await mutate({
                   mutation: setUserRole,
                   variables: { userId: user.id, isAdmin: true },
@@ -231,6 +234,7 @@ describe('AdminResolver', () => {
 
             describe('to usual user', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 await mutate({
                   mutation: setUserRole,
                   variables: { userId: user.id, isAdmin: false },
@@ -307,6 +311,7 @@ describe('AdminResolver', () => {
 
         describe('user to be deleted does not exist', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({ mutation: deleteUser, variables: { userId: admin.id + 1 } }),
             ).resolves.toEqual(
@@ -323,6 +328,7 @@ describe('AdminResolver', () => {
 
         describe('delete self', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({ mutation: deleteUser, variables: { userId: admin.id } }),
             ).resolves.toEqual(
@@ -356,6 +362,7 @@ describe('AdminResolver', () => {
 
           describe('delete deleted user', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({ mutation: deleteUser, variables: { userId: user.id } }),
               ).resolves.toEqual(
@@ -427,6 +434,7 @@ describe('AdminResolver', () => {
 
         describe('user to be undelete does not exist', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({ mutation: unDeleteUser, variables: { userId: admin.id + 1 } }),
             ).resolves.toEqual(
@@ -447,6 +455,7 @@ describe('AdminResolver', () => {
           })
 
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({ mutation: unDeleteUser, variables: { userId: user.id } }),
             ).resolves.toEqual(
@@ -939,6 +948,7 @@ describe('AdminResolver', () => {
 
           describe('user to create for does not exist', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({ mutation: adminCreateContribution, variables }),
               ).resolves.toEqual(
@@ -962,6 +972,7 @@ describe('AdminResolver', () => {
             })
 
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({ mutation: adminCreateContribution, variables }),
               ).resolves.toEqual(
@@ -987,6 +998,7 @@ describe('AdminResolver', () => {
             })
 
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({ mutation: adminCreateContribution, variables }),
               ).resolves.toEqual(
@@ -1013,6 +1025,7 @@ describe('AdminResolver', () => {
 
             describe('date of creation is not a date string', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 await expect(
                   mutate({ mutation: adminCreateContribution, variables }),
                 ).resolves.toEqual(
@@ -1034,6 +1047,7 @@ describe('AdminResolver', () => {
 
             describe('date of creation is four months ago', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 const now = new Date()
                 variables.creationDate = new Date(
                   now.getFullYear(),
@@ -1061,6 +1075,7 @@ describe('AdminResolver', () => {
 
             describe('date of creation is in the future', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 const now = new Date()
                 variables.creationDate = new Date(
                   now.getFullYear(),
@@ -1088,6 +1103,7 @@ describe('AdminResolver', () => {
 
             describe('amount of creation is too high', () => {
               it('throws an error', async () => {
+                jest.clearAllMocks()
                 variables.creationDate = new Date().toString()
                 await expect(
                   mutate({ mutation: adminCreateContribution, variables }),
@@ -1213,6 +1229,7 @@ describe('AdminResolver', () => {
 
           describe('user for creation to update does not exist', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminUpdateContribution,
@@ -1242,6 +1259,7 @@ describe('AdminResolver', () => {
 
           describe('user for creation to update is deleted', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminUpdateContribution,
@@ -1267,6 +1285,7 @@ describe('AdminResolver', () => {
 
           describe('creation does not exist', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminUpdateContribution,
@@ -1292,6 +1311,7 @@ describe('AdminResolver', () => {
 
           describe('user email does not match creation user', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminUpdateContribution,
@@ -1326,6 +1346,7 @@ describe('AdminResolver', () => {
           describe('creation update is not valid', () => {
             // as this test has not clearly defined that date, it is a false positive
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminUpdateContribution,
@@ -1502,6 +1523,7 @@ describe('AdminResolver', () => {
         describe('adminDeleteContribution', () => {
           describe('creation id does not exist', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminDeleteContribution,
@@ -1538,6 +1560,7 @@ describe('AdminResolver', () => {
             })
 
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: adminDeleteContribution,
@@ -1583,6 +1606,7 @@ describe('AdminResolver', () => {
         describe('confirmContribution', () => {
           describe('creation does not exits', () => {
             it('throws an error', async () => {
+              jest.clearAllMocks()
               await expect(
                 mutate({
                   mutation: confirmContribution,
diff --git a/backend/src/graphql/resolver/ContributionResolver.test.ts b/backend/src/graphql/resolver/ContributionResolver.test.ts
index 323efe5d9..6033560da 100644
--- a/backend/src/graphql/resolver/ContributionResolver.test.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.test.ts
@@ -375,6 +375,7 @@ describe('ContributionResolver', () => {
 
       describe('wrong contribution id', () => {
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await expect(
             mutate({
               mutation: updateContribution,
@@ -456,6 +457,7 @@ describe('ContributionResolver', () => {
         })
 
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await expect(
             mutate({
               mutation: updateContribution,
@@ -486,6 +488,7 @@ describe('ContributionResolver', () => {
 
       describe('admin tries to update a user contribution', () => {
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await expect(
             mutate({
               mutation: adminUpdateContribution,
@@ -516,6 +519,7 @@ describe('ContributionResolver', () => {
         })
 
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await expect(
             mutate({
               mutation: updateContribution,
@@ -546,6 +550,7 @@ describe('ContributionResolver', () => {
 
       describe('update creation to a date that is older than 3 months', () => {
         it('throws an error', async () => {
+          jest.clearAllMocks()
           const date = new Date()
           await expect(
             mutate({
@@ -830,6 +835,7 @@ describe('ContributionResolver', () => {
 
       describe('User deletes already confirmed contribution', () => {
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await mutate({
             mutation: login,
             variables: { email: 'peter@lustig.de', password: 'Aa12345_' },
diff --git a/backend/src/graphql/resolver/TransactionResolver.test.ts b/backend/src/graphql/resolver/TransactionResolver.test.ts
index d391f8ab9..9e74623c8 100644
--- a/backend/src/graphql/resolver/TransactionResolver.test.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.test.ts
@@ -67,6 +67,7 @@ describe('send coins', () => {
 
   describe('unknown recipient', () => {
     it('throws an error', async () => {
+      jest.clearAllMocks()
       await mutate({
         mutation: login,
         variables: bobData,
@@ -93,6 +94,7 @@ describe('send coins', () => {
 
     describe('deleted recipient', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         await mutate({
           mutation: login,
           variables: peterData,
@@ -125,6 +127,7 @@ describe('send coins', () => {
 
     describe('recipient account not activated', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         await mutate({
           mutation: login,
           variables: peterData,
@@ -166,6 +169,7 @@ describe('send coins', () => {
 
     describe('sender and recipient are the same', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         expect(
           await mutate({
             mutation: sendCoins,
@@ -189,6 +193,7 @@ describe('send coins', () => {
 
     describe('memo text is too long', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         expect(
           await mutate({
             mutation: sendCoins,
@@ -212,6 +217,7 @@ describe('send coins', () => {
 
     describe('memo text is too short', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         expect(
           await mutate({
             mutation: sendCoins,
@@ -235,6 +241,7 @@ describe('send coins', () => {
 
     describe('user has not enough GDD', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         expect(
           await mutate({
             mutation: sendCoins,
@@ -260,6 +267,7 @@ describe('send coins', () => {
 
     describe('sending negative amount', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         expect(
           await mutate({
             mutation: sendCoins,
diff --git a/backend/src/graphql/resolver/UserResolver.test.ts b/backend/src/graphql/resolver/UserResolver.test.ts
index cf4ad8d4b..1ff0a96ed 100644
--- a/backend/src/graphql/resolver/UserResolver.test.ts
+++ b/backend/src/graphql/resolver/UserResolver.test.ts
@@ -525,6 +525,7 @@ describe('UserResolver', () => {
       })
 
       it('throws an error', () => {
+        jest.clearAllMocks()
         expect(result).toEqual(
           expect.objectContaining({
             errors: [
@@ -555,6 +556,7 @@ describe('UserResolver', () => {
       })
 
       it('throws an error', () => {
+        jest.clearAllMocks()
         expect(result).toEqual(
           expect.objectContaining({
             errors: [new GraphQLError('Could not login with emailVerificationCode')],
@@ -588,6 +590,7 @@ describe('UserResolver', () => {
       })
 
       it('throws an error', () => {
+        jest.clearAllMocks()
         expect(result).toEqual(
           expect.objectContaining({
             errors: [new GraphQLError('No user with this credentials')],
@@ -666,6 +669,7 @@ describe('UserResolver', () => {
   describe('logout', () => {
     describe('unauthenticated', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         resetToken()
         await expect(mutate({ mutation: logout })).resolves.toEqual(
           expect.objectContaining({
@@ -704,6 +708,7 @@ describe('UserResolver', () => {
   describe('verifyLogin', () => {
     describe('unauthenticated', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         resetToken()
         await expect(query({ query: verifyLogin })).resolves.toEqual(
           expect.objectContaining({
@@ -723,6 +728,7 @@ describe('UserResolver', () => {
       })
 
       it('throws an error', async () => {
+        jest.clearAllMocks()
         resetToken()
         await expect(query({ query: verifyLogin })).resolves.toEqual(
           expect.objectContaining({
@@ -883,6 +889,7 @@ describe('UserResolver', () => {
 
     describe('wrong optin code', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         await expect(
           query({ query: queryOptIn, variables: { optIn: 'not-valid' } }),
         ).resolves.toEqual(
@@ -919,6 +926,7 @@ describe('UserResolver', () => {
   describe('updateUserInfos', () => {
     describe('unauthenticated', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         resetToken()
         await expect(mutate({ mutation: updateUserInfos })).resolves.toEqual(
           expect.objectContaining({
@@ -976,6 +984,7 @@ describe('UserResolver', () => {
 
       describe('language is not valid', () => {
         it('throws an error', async () => {
+          jest.clearAllMocks()
           await expect(
             mutate({
               mutation: updateUserInfos,
@@ -998,6 +1007,7 @@ describe('UserResolver', () => {
       describe('password', () => {
         describe('wrong old password', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({
                 mutation: updateUserInfos,
@@ -1020,6 +1030,7 @@ describe('UserResolver', () => {
 
         describe('invalid new password', () => {
           it('throws an error', async () => {
+            jest.clearAllMocks()
             await expect(
               mutate({
                 mutation: updateUserInfos,
@@ -1108,6 +1119,7 @@ describe('UserResolver', () => {
   describe('searchAdminUsers', () => {
     describe('unauthenticated', () => {
       it('throws an error', async () => {
+        jest.clearAllMocks()
         resetToken()
         await expect(mutate({ mutation: searchAdminUsers })).resolves.toEqual(
           expect.objectContaining({