state-of-terraform-2025

This repo is complementary to the talk "State of terraform 2025".

• state-of-terraform-2025
  • How to demo
    • 1. Basic setup
    • 2. Validations
    • 3. Preconditions
    • 4. Postconditions
    • 5. "Unit Tests" / "Integration Tests"
    • 6. Checks ("End-to-End Tests")

How to demo

1. Basic setup

1. Start LocalStack Container

docker run --rm -it -p 4566:4566 -p 4510-4559:4510-4559 localstack/localstack:4.1.0

2. Run Terraform init

tofu init
terraform init

3. Run Terraform apply

tofu apply
terraform apply

4. Open the Static Website in Browser The link will be displayed in the console output of terraform apply and will look something like https://some-example-bucket-for-a-static-website.s3-website.localhost.localstack.cloud:4566/.

5. List bucket created in localstack: awslocal s3api list-buckets.

2. Validations

1. Validation fails

tofu plan --var bucket_name="1.1.1.1"
terraform plan --var bucket_name="1.1.1.1"

2. Validation passes

tofu plan --var bucket_name="some-example-bucket-for-a-static-website"
terraform plan --var bucket_name="some-example-bucket-for-a-static-website"

3. Preconditions

This would fail the precondition:

tofu plan --var website_index_object_key="hello_world.html"
terraform plan --var website_index_object_key="hello_world.html"

4. Postconditions

This would fail the postcondition:

tofu apply --var enable_versioning=false
terraform apply --var enable_versioning=false

This would satisfy the postcondition again:

tofu apply --var enable_versioning=true
terraform apply --var enable_versioning=true

Note, that this command does not fail the postcondition:

tofu plan --var enable_versioning=false
terraform plan --var enable_versioning=false

5. "Unit Tests" / "Integration Tests"

tofu test
terraform test

6. Checks ("End-to-End Tests")

Rerun terraform apply or tofu apply and watch the output. You can also change something in the assertion in check.tf to see how the check fails.