How to use variables in definition.yml

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Hello All,

I want to use variables defined in the dbt_project.yml in definition.yml for testing the models.
But so far these variables are not being recognized when running the test cases using dbt test -m <model_name>
Is there are way to access variables in definition.yml ?

My code looks like this

dbt_project.yml

name: 'first_dbt_project'
version: '1.0.0'

# This setting configures which "profile" dbt uses for this project.
profile: default
config-version: 2
source-paths: ["models"]
analysis-paths: ["analysis"]
test-paths: ["tests"]
data-paths: ["data"]
macro-paths: ["macros"]
snapshot-paths: ["snapshots"]

clean-targets:   
    - "target"
    - "dbt_modules"

vars:
  runDate: 20210131
  intakeDate: 202106

definition.yml

version: 2

models:
  - name: first_model
    tests:
      - dbt_utils.expression_is_true:
          expression: "len(machine_id) between 8 and 9 "
          where: "rundate > {{ var('rundate')}}"