Feature Flags
Most teams test their applications with feature flags. Few teams test their feature flag infrastructure itself. This is a gap — a broken flag system means features either always-on or always-off for all users, bypassing your entire deployment strategy. This guide covers testing the flag infrastructure: the systems that
Testing
Pulumi's core advantage over Terraform is that infrastructure is real code — you can test it with real testing tools. But most Pulumi testing guides stop at mocking: mock the AWS provider, assert outputs, done. That misses the Automation API, which lets you manage Pulumi stacks programmatically — no CLI
Testing
AWS CDK has two testing approaches that serve different purposes and are commonly confused: 1. Fine-grained assertions (hasResourceProperties, hasResource, resourceCountIs) — assert specific properties of specific resources 2. Snapshot tests (toMatchSnapshot) — assert the entire synthesized CloudFormation template hasn't changed Most CDK projects use one or the other exclusively,
Testing
OpenTofu is the open-source, community-driven fork of Terraform, created after HashiCorp changed Terraform's license from MPL to BSL 1.1 in August 2023.
Testing
Writing Ansible roles without tests is a recipe for broken playbooks. Molecule is the official testing framework for Ansible roles and collections.
Testing
Most Ansible roles are never tested. You write the role, run it on a server, see that it "works," and commit.
Testing
Service meshes like Istio and Linkerd add a powerful layer of infrastructure between your microservices: traffic management, mTLS encryption, observability, and resilience features. But they also add complexity to testing. A service that works fine in unit tests may behave unexpectedly when running behind a mesh proxy. This guide covers
Testing
Most teams treat test environment provisioning as an operations problem: file a ticket, wait for an engineer to spin something up, hope it matches what you actually need. Infrastructure as Code flips this. When your test environments are defined in Terraform, any team member can provision a complete, correctly configured
Testing
Infrastructure code breaks. An S3 bucket gets configured with public ACLs. A security group rule opens port 22 to the world.