Introduce a missing set for the rollback of the token (#662)

* Introduce a missing set for the rollback of the token so that in case of failure, the token is rollbacked properly instead of being nulled away

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Fix Test

Signed-off-by: d067928 <jakob.moeller@sap.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/transaction/RetrieveDiagnosisKeysTransaction.kt

@@ -205,6 +205,7 @@ object RetrieveDiagnosisKeysTransaction : Transaction() {
      * Executes the TOKEN Transaction State
      */
     private suspend fun executeToken() = executeState(TOKEN) {
+        googleAPITokenForRollback.set(LocalData.googleApiToken())
         val tempToken = UUID.randomUUID().toString()
         LocalData.googleApiToken(tempToken)
         return@executeState tempToken

Corona-Warn-App/src/test/java/de/rki/coronawarnapp/transaction/RetrieveDiagnosisKeysTransactionTest.kt

@@ -19,6 +19,7 @@ import org.junit.Test
 import java.io.File
 import java.nio.file.Paths
 import java.util.Date
+import java.util.UUID
 
 /**
  * RetrieveDiagnosisKeysTransaction test.
@@ -44,6 +45,7 @@ class RetrieveDiagnosisKeysTransactionTest {
         every { LocalData.googleApiToken(any()) } just Runs
         every { LocalData.lastTimeDiagnosisKeysFromServerFetch() } returns Date()
         every { LocalData.lastTimeDiagnosisKeysFromServerFetch(any()) } just Runs
+        every { LocalData.googleApiToken() } returns UUID.randomUUID().toString()
     }
 
     @Test