Ruby tests failing in pipeline for inherited fixture sets.

[Brett Mahnke]

# bitbucket inherited fixtures rails test
image: ruby:2.5

pipelines:
  default:
    - step:
       caches:
         - bundler 
       script: # Modify the commands below to build your repository.
         - cd $BITBUCKET_CLONE_DIR
         - apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs ruby-dev libidn11 libidn11-dev yarn
         - echo "bundle install"
         - bundle install --path vender/bundle
         - echo "migrate/seed/test"
         - rake db:migrate RAILS_ENV=test
         - rake test RAILS_ENV=test
       services:
         - postgres
         - redis
  definitions:
    services:
      redis: 
        image: redis 
      postgres:
        image: postgres
        environment:
          POSTGRES_DB: $db_name
          POSTGRES_USER: $db_user
          POSTGRES_PASSWORD: $db_password
    caches:
      bundler: vendor/bundle

 Above is my pipeline file. 

When the pipeline runs after a commit to the master branch, any test that references a fixture, that deals with a model that extends a different model, they fail. 

Ex:

class SomeClass < ApplicationRecord

end



class SecondClass < SomeClass

end

So, any test that is trying to find a fixture set in via the active record helper in tests fails:

Example:

Here, I'm trying to make an instance variable named second, by trying to find a SecondClass record, named some_record. This will fail the find the record, and there will be an error thrown in the pipeline output.

second = second_classes(:some_record)

Why is this? Or, how can ensure my tests pass in the Bitbucket Pipeline? They all pass locally.