Jan 16, 2022Set up Mullvad VPN on FreshTomatoMullvad offers an outdated setup guide for FreshTomato. Trying to follow the official guide I have encountered some pitfalls. The following guide is an attempt to avoid having the next person trying to spend to much time troubleshooting their setup The guide uses FreshTomato Version 2021.7. We start in our…3 min read3 min read
Mar 3, 2021Tests for AWS CDK codeThe AWS Cloud Development Kit (CDK) allows us to define our cloud infrastructure using code. Instead of clicking through the web UI, or AWS console as it is called, we use code. Code that can be checked into version control for collaboration, annotated with documentation and certainly for testing. The…Cdk4 min readCdk4 min read
Published inBetter Programming·Jan 28, 2021Writing Unit Tests for SwiftUI ViewsEnsure your apps are working perfectly fine — Unit tests help us to make sure our app works as intended without having to start the app and navigate manually through it after every change. In comparison with UI tests, they test single views in isolation instead of a full user flow. …IOS4 min readIOS4 min read
Published inLevel Up Coding·Oct 31, 2020Immutability and Security — From Java to Kotlin to HaskellThe state of an immutable object cannot be modified after its creation. If the object can be modified after its creation we call it a mutation of the object. In short the object is mutable. Let’s use an example in Java. We have list of allowedUsers , a method to…Immutability3 min readImmutability3 min read
Published in#NextLevelGermanEngineering·Oct 22, 2020How to Make UI Tests in iOS Less AnnoyingUI testing in iOS is often criticized for being too slow or hard to maintain. At Porsche Digital, we found a way to avoid the pitfalls and make UI testing more smooth. …IOS App Development8 min readIOS App Development8 min read
Jul 19, 2020Consumer Driven Contract TestsDescribing the practice in simple terms Say we provide a service. Getting a user by its id would return the following infos curl https://someserver.com/api/users/1 { "id": 1, "name": "Jane Doe", "age": 23, "address": "Somestreet 123 in City" "premium": true } The id, the name, the age, the address and a…Consumer Driven Contract5 min readConsumer Driven Contract5 min read
Jul 13, 2020Setting a specific timezone in AWS FargateAWS Fargate removes the need to provision and manage services. When sending mails with Amazon SES the mail will have a sent date. Example: A german user triggers something at 3 PM Berlin time. That in turn sends a mail. Could be a password reset. Without changes in the timezone…Docker3 min readDocker3 min read
Jul 5, 2020Handling UserDefaults in iOS UI TestsWe can use UserDefaults to store any basic data types. Bool, Int, String and more. The data is loaded when the app starts and removed when the application is deleted from the device. One example where UserDefaults comes in handy is to mark wether the user has seen the tutorial…IOS2 min readIOS2 min read
Jun 1, 2020Dissecting a Bitcoin ScriptIn the book Programming Bitcoin by Jimmy Song at the end of Chapter 6 we are presented with the following Bitcoin script as part of an exercise. What is the following supposed to do? OP_2DUP, OP_EQUAL, OP_NOT, OP_VERIFY, OP_SHA1, OP_SWAP, OP_SHA1, OP_EQUAL Let’s take a step back. …Bitcoin5 min readBitcoin5 min read
Published inLevel Up Coding·May 24, 2020Passwordless sign-in, via email link, with Firebase and Vue.jsBy using a password manager the handling of sign up and log in is easy. Although not all the time. Some sites restrict the length or do not allow some characters. In addition the autofill does not always work, which requires us to copy and paste passwords around. Not everyone…Vuejs4 min readVuejs4 min read
