kitchen-terraform

kitchen-terraform is a set of Test Kitchen plugins for testing Terraform configuration.

Requirements

Ruby (~> 2.1)
Bundler (~> 1.12)
Terraform (>= 0.6, < 0.10)

Installation

kitchen-terraform is packaged as a cryptographically signed Ruby gem which means it can be installed with Bundler.

Adding kitchen-terraform to a Terraform project

Once Bundler is installed, add kitchen-terraform to the project's Gemfile:

source 'https://rubygems.org/' do
  gem 'kitchen-terraform', '~> 0.7'
end

Then, use Bundler to install the gems:

bundle install

Usage

The provided plugins must all be used together in the Test Kitchen configuration in order to successfully test the provided Terraform configuration.

Refer to Getting Started Readme for a detailed walkthrough of setting up and using kitchen-terraform.

Refer to the examples directory for a detailed example project.

Plugins

Driver

The driver is a wrapper around the Terraform command-line interface. It is responsible for enforcing Terraform version support and works with the provisioner to manage the Terraform state.

Actions

kitchen create

The driver ensures that the parent directories of the plan and state files exist.

kitchen destroy

The driver applies a destructive Terraform plan to the Terraform state based on the Terraform configuration provided to the provisioner.

Configuration

cli

The pathname of the Terraform command-line interface (CLI) executable or an executable that implements an equivalent interface.

Example .kitchen.yml

---
driver:
  name: terraform
  cli: /usr/local/bin/terraform

Default

The default cli is 'terraform', and is assumed to exist in the user's PATH.

Provisioner

The provisioner is the bridge between Terraform and Test Kitchen. It is responsible for managing the Test Kitchen configuration options related to the Terraform configuration and works with the driver to manage the Terraform state.

Actions

kitchen converge

The provisioner uses the driver to apply a constructive Terraform plan to the Terraform state based on the provided Terraform configuration.

Configuration

apply_timeout

The number of seconds to wait for the Terraform apply command to be successful before raising an error.

Example .kitchen.yml

---
provisioner:
  name: terraform
  apply_timeout: 1000

Default

The default apply_timeout is 600 seconds.

color

Enable or disable colored output from the Terraform command.

Example .kitchen.yml

---
provisioner:
  name: terraform
  color: false

Default

The default value for color is true.

parallelism

The number of concurrent operations to allow for the Terraform apply and plan commands.

Example .kitchen.yml

provisioner:
  name: terraform
  parallelism: 2

Default

The default parallelism is 10.

plan

The pathname of the execution plan that Terraform will generate and apply.

Example .kitchen.yml

---
provisioner:
  name: terraform
  plan: /terraform/plan

Default

The default plan is under the current working directory of Test Kitchen at .kitchen/kitchen-terraform/<suite_name>/terraform.tfplan.

state

The pathname of the state file that Terraform will generate.

Example .kitchen.yml

---
provisioner:
  name: terraform
  state: /terraform/state

Default

The default state is under the current working directory of Test Kitchen at .kitchen/kitchen-terraform/<suite_name>/terraform.tfstate.

variable_files

A collection of pathnames of Terraform variable files to be evaluated for the configuration.

Example .kitchen.yml

---
provisioner:
  name: terraform
  variable_files:
    - first/terraform/variable/file
    - second/terraform/variable/file
---
provisioner:
  name: terraform
  variable_files: a/terraform/variable/file

Default

The default variable_files collection is empty.

variables

A mapping of Terraform variables to be set in the configuration.

Example .kitchen.yml

---
provisioner:
  name: terraform
  variables:
    foo: bar
# deprecated
---
provisioner:
  name: terraform
  variables:
    - foo=bar
    - biz=baz
---
# deprecated
provisioner:
  name: terraform
  variables: foo=bar

Default

The default variables collection is empty.

Verifier

The verifier is a wrapper around InSpec. It is responsible for verifying the behaviour of any server instances in the Terraform state.

Actions

kitchen verify

The verifier verifies the test suite's configured groups of server instances in the Terraform state using an InSpec profiles located in <Test Kitchen working directory>/test/integration/<suite name>.

Configuration

The verifier inherits from kitchen-inspec and should support any configuration defined by that plugin with the exception of the port and username configuration which are specified under groups.

groups

A collection of mappings that define how to test different resources in the Terraform configuration.

Each group consists of:

a name to use for logging purposes
an optional attributes mapping of InSpec profile attribute names to Terraform output variable names to define for the suite's InSpec profile
a controls collection of InSpec controls to include from the suite's InSpec profile
a mapping of InSpec profile attribute names to Terraform output variable names; the attributes will be with the resolved output values
an optional hostnames output variable name to use for extracting hostnames from the Terraform state; the resolved output value is assumed to be a list of strings or a string in CSV format
an optional port to use when connecting to the group's hosts
an optional username to use when connecting to the group's hosts

If hostnames is empty then the group's controls will be executed locally; this enables testing of a provider's API to verify non-server resources.

Example .kitchen.yml

verifier:
  name: terraform
  groups:
  - name: arbitrary
    attributes:
      foo: bar
    controls:
    - biz
    hostnames: hostnames_output
    port: 123
    username: test-user

Defaults

The default groups collection is empty.

For each group:

the default attributes mapping consists of equivalently named attributes for each output variable as well as a "terraform_state" attribute containing the pathname of the state file; additional or overridden associations can be added.
the default controls collection is empty
the default hostnames string is empty
the default port is obtained from the transport
the default username is obtained from the transport

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