Getting everyone to write infrastructure tests

In this post, we will outline our usual strategy to get an entire team to quickly fill testing holes – like writing infrastructure tests. Why? Because we find ourselves using this approach frequently at clients. Some context: Qxf2 engineers work with early stage products that neglected writing tests in favour of shipping quickly. This means, we almost always enter situations […]

Integrating CloudWatch Alarms with Skype

At Qxf2, our AWS environment hosts a multitude of applications, so monitoring the AWS services in real time is crucial for maintaining system reliability and performance. We’ve been using CloudWatch alarms to help us watch over our resources, these alarms used to send us emails whenever something went wrong. The problem was, it is often easy to miss these alerts […]

Auditing AWS cloud resources with Chef InSpec

Continuing from the preceding blog, ‘Auditing OS Level Resources with Chef InSpec’ which delved into utilizing the Chef InSpec open-source tool for testing individual servers via OS level resources. Now, we embark into the domain of Chef InSpec’s facility in cloud environments. Chef InSpec extends its support to cloud platforms like AWS, Azure, and GCP. Referring to insights shared in […]

Exploratory Testing with Logmine

This post will discuss how to improve your Exploratory Testing using Logmine. For sometime, I have been looking out for a log analyzer when I started doing exploratory testing with a new product. Logs are a gold mine of information if used well. You can infer common problems, get testing ideas, understand typical behaviour of a product and more from […]

Data Generation for Text Classification

I set out to evaluate a ML model (emotion classifier) from a human/user perspective. The heart of my attempt was going to be around designing the right set of data to evaluate the performance of the model. Very quickly, I realized that there is more to this task than meets the eye. In this post, I will share several problems […]

Using Airflow to start and stop EC2 instances

In this post we will show you how to use Airflow to start and stop EC2 instances. Airflow is a popular open-source platform that engineering teams use to manage workflows. It uses a concept called Directed Acyclic Graphs (DAGs) which lets you chain multiple steps into a workflow. Airflow’s popularity is also partly due to an extensive library of operators. […]

Robustness Testing of Machine Learning Models

In the world of machine learning, assessing a model’s performance under real-world conditions is important to ensure its reliability and robustness. Real-world data is usually not perfect, it may contain messy data or data with noise, outliers, and variations. During model training, these types of data could be limited, and the model may not have received sufficient training to handle […]