graphql-engine/server/tests-py/README.md

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## Running tests
The easiest way to run the test suite is to do:
$ scripts/dev.sh test
This should install python dependencies if required, and run in isolation. The output format is described in the [pytest documentation](https://docs.pytest.org/en/latest/usage.html#detailed-summary-report). Errors and failures are indicated by `F`s and `E`s.
## Tests Structure
- Tests are grouped as test classes in test modules (names starting with `test_`)
- The configuration files (if needed) for the tests in a class are usually kept in one folder.
- The folder name is usually either the `dir` variable or the `dir()` function
- Some tests (like in `test_graphql_queries.py`) requires a setup and teardown per class.
- Here we are extending the `DefaultTestSelectQueries` class.
- This class defines a fixture which will run the configurations in `setup.yaml` and `teardown.yaml` once per class
- Extending test class should define a function name `dir()`, which returns the configuration folder
- For mutation tests (like in `test_graphql_mutations.py`)
- We need a `schema_setup` and `schema_teardown` per class
- And `values_setup` and `values_teardown` per test
- Doing schema setup and teardown per test is expensive.
- We are extending the `DefaultTestMutations` class for this.
- This class defines a fixture which will run the configuration in `setup.yaml` and `teardown.yaml` once per class.
- Another fixture defined in this class runs the configuration in `values_setup.yaml` and `values_teardown.yaml` once per class.