A pytest plugin for testing dbt adapter plugins
Project description
A test suite for adapter plugins.
Installation and use
pip install pytest-dbt-adapter
You'll need to install this package with pip install pytest-dbt-adapter
and write a specfile, which is a yaml file ending in .dbtspec
. See the included spark/postgres examples in specs
. You can also write custom test sequences and override existing default projects.
After installing this package, you should be able to run your spec with pytest path/to/mytest.dbspec
. You'll need dbt-core and your adapter plugin installed in the environment as well.
This package also includes a module named dbt_adapter_tests
that includes helpers for writing integration tests with Python if necessary. For maintainability purposes, this should only be used as a last resort for scenarios that are impossible to capture with a specfile.
Specs
A spec is composed of a minimum of two things:
- a
target
block - a
sequences
block- The keys are test names. You can select from these names with pytest's
-k
flag. - The values are test sequence definitions.
- The keys are test names. You can select from these names with pytest's
Optionally, there is also:
- a
projects
block
Targets
A target block is just like a target block you'd use in dbt core. However, there is one special change: the schema
field should include a {{ var('_dbt_random_suffix') }}
somewhere that the test suite will insert.
Sequences
A sequence has a name
(the sequence name), a project
(the project name to use), and sequence
(a collection of test steps). You can declare new sequences inline, or use the name of a builtin sequence. A sequence itself is just a list of steps. You can find examples in the form of the builtin sequences in the sequences/
folder.
You are encouraged to use as many sequences as you can from the built-in list without modification.
Projects
The minimum project contains only a name
field. The value is the name of the project - sequences include a project name.
A project also has an optional paths
block, where the keys are relative file paths (to a dbt_project.yml
that will be written), and the values are the contents of those files.
There is a dbt_project_yml
block, which should be a dictionary that will be updated into the default dbt_project.yml (which sets name, version, and config-version).
Instead of declaring a name
field, a project definition may have an overrides
field that names a builtin project. The test suite will update the named builtin project with those overrides, instead of overwriting the full project with a new one.
Project details
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