Unit testing dynamics

[jesse...@cloverhealth.com]

Hi all,

I have some dynamics which manifest some level of smarts. I want to unit test them using rspec. How do I even get started here? In the end I want either an AttributeStruct I can test the contents of, or a JSON blob I can do the same to.

I've tried creating a new SparkleFormation::Sparkle pack, which I can create and I have no idea how to proceed with.

I've also tried instantiating a SparkleFormation, but same thing.

Same thing also with setting SparkleFormation.sparkle_path, explicitly calling SparkleFormation.load_dynamics!, and trying to SparkleFormation.compile a simple fixture stack definition.

Is anybody else doing this?

Thanks,

-Jesse

[Chris Roberts]

Hi Jesse,

I use minitest, so just adjust to your testing framework as you see
fit. You can see examples of template testing within the
sparkle_formation tests. A good place to start would be here:

https://github.com/sparkleformation/sparkle_formation/blob/master/test/specs/template_spec.rb

This generates the template instance, then dumps it to a Smash (which
is a Hash with some extra helps) and tests the contents for the
expected values.

Cheers!

- Chris

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[Jesse Kempf]

Here’s what I’m getting when I crib from that:

(v) ✘-1 13:45 ~/workspace/genesis [tests L|✚ 3…3126⚑ 1] $ bundle exec rspec

.F

Failures:

  1) SparkleFormation compiles

     Failure/Error: dynamic!(:vpc_subnet, 'foo')

     

     RuntimeError:

       Failed to locate requested dynamic block for insertion: vpc_subnet (valid: )

       Builtin dynamics pattern `AWS::OpsWorks::App` -> `:aws_ops_works_app`

     # ./spec/fixtures/sfn/vpc_subnet_foo.rb:2:in `block in compile'

     # ./spec/unit/sparkleformation/dynamics/vpc_spec.rb:11:in `block (2 levels) in <top (required)>'

     # ------------------

     # --- Caused by: ---

     # SparkleFormation::Error::NotFound::Dynamic:

     #   Failed to locate item named: `vpc_subnet`

     #   ./spec/fixtures/sfn/vpc_subnet_foo.rb:2:in `block in compile'

Finished in 0.04821 seconds (files took 0.10017 seconds to load)

2 examples, 1 failure

Failed examples:

rspec ./spec/unit/sparkleformation/dynamics/vpc_spec.rb:10 # SparkleFormation compiles

(v) ✘-1 13:45 ~/workspace/genesis [tests L|✚ 3…3126⚑ 1] $ 

My directory layout looks like:

(v) ✔ 13:47 ~/workspace/genesis [tests L|✚ 3…3125⚑ 1] $ find spec -type f -follow

spec/fixtures/sfn/dynamics/vpc.rb

spec/fixtures/sfn/vpc_subnet_foo.rb

spec/spec_helper.rb

spec/unit/sparkleformation/dynamics/vpc_spec.rb

(v) ✔ 13:47 ~/workspace/genesis [tests L|✚ 3…3124⚑ 1] $ 

Tests look like:

(v) ✘-1 13:48 ~/workspace/genesis [tests L|✚ 3…3125⚑ 1] $ cat spec/unit/sparkleformation/dynamics/vpc_spec.rb 

require 'sparkle_formation'

describe SparkleFormation do

  before do

    SparkleFormation.sparkle_path = File.join(File.dirname(__FILE__), '../../../fixtures/sfn')

  end

  it { expect(1).to eq 1}

  it 'compiles' do

    SparkleFormation.compile('vpc_subnet_foo.rb')

  end

end

(v) ✔ 13:49 ~/workspace/genesis [tests L|✚ 3…3125⚑ 1] $ 

It’s definite that the sparkle_path is set to the correct directory.

And finally the fixture template looks like this:

(v) ✔ 13:52 ~/workspace/genesis [tests L|✚ 3…3125⚑ 1] $ cat spec/fixtures/sfn/vpc_subnet_foo.rb 

SparkleFormation.new(:vpc_subnet_foo, provider: :aws) do

  dynamic!(:vpc_subnet, 'foo')

end

(v) ✔ 13:53 ~/workspace/genesis [tests L|✚ 3…3125⚑ 1] $ 

Is there something else I need to do to get loading the dynamics working?

Thanks,

-Jesse

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