feat(backend): test transaction links

backend/src/graphql/resolver/TransactionLinkResolver.test.ts

@@ -306,7 +306,6 @@ describe('TransactionLinkResolver', () => {
           })
         })
 
-        // TODO: have this test separated into a transactionLink and a contributionLink part
         describe('redeem daily Contribution Link', () => {
           const now = new Date()
           let contributionLink: DbContributionLink | undefined
@@ -508,6 +507,35 @@ describe('TransactionLinkResolver', () => {
           })
         })
       })
+
+      describe('transaction link', () => {
+        beforeEach(() => {
+          jest.clearAllMocks()
+        })
+
+        describe('link does not exits', () => {
+          beforeAll(async () => {
+            await mutate({
+              mutation: login,
+              variables: { email: 'bibi@bloxberg.de', password: 'Aa12345_' },
+            })
+          })
+
+          it('throws and logs the error', async () => {
+            await expect(
+              mutate({
+                mutation: redeemTransactionLink,
+                variables: {
+                  code: 'not-valid',
+                },
+              }),
+            ).resolves.toMatchObject({
+              errors: [new GraphQLError('Transaction link not found')],
+            })
+            expect(logger.error).toBeCalledWith('Transaction link not found', 'not-valid')
+          })
+        })
+      })
     })
   })
 

backend/src/graphql/resolver/TransactionLinkResolver.ts

@@ -285,12 +285,20 @@ export class TransactionLinkResolver {
       return true
     } else {
       const now = new Date()
-      const transactionLink = await DbTransactionLink.findOneOrFail({ code })
-      const linkedUser = await DbUser.findOneOrFail(
+      const transactionLink = await DbTransactionLink.findOne({ code })
+      if (!transactionLink) {
+        throw new LogError('Transaction link not found', code)
+      }
+
+      const linkedUser = await DbUser.findOne(
         { id: transactionLink.userId },
         { relations: ['emailContact'] },
       )
 
+      if (!linkedUser) {
+        throw new LogError('Linked user not found for given link', transactionLink.userId)
+      }
+
       if (user.id === linkedUser.id) {
         throw new LogError('Cannot redeem own transaction link', user.id)
       }