more tests: entity fetching + erase

passKit/Crypto/PGPAgent.swift

@@ -34,6 +34,10 @@ public class PGPAgent {
         pgpInterface = nil
     }
 
+    public func isInitialized() -> Bool {
+        pgpInterface != nil
+    }
+
     public func getKeyID() throws -> [String] {
         try checkAndInit()
         return pgpInterface?.keyID ?? []

passKit/Models/PasswordStore.swift

@@ -324,7 +324,7 @@ public class PasswordStore {
         PersistenceController.shared.save()
     }
 
-    public func deleteCoreData() {
+    private func deleteCoreData() {
         PasswordEntity.deleteAll(in: context)
         PersistenceController.shared.save()
     }