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Hypothesis strategies for GraphQL schemas and queries

Project description

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Hypothesis strategies for GraphQL schemas, queries and data.

NOTE This package is experimental, many things don’t work yet and documented in a way they are planned to be used.

Usage

There are four strategies for different use cases.

  1. Schema generation - hypothesis_graphql.strategies.schema()
  2. Query - hypothesis_graphql.strategies.query(schema).
  3. Response for a query - hypothesis_graphql.strategies.response(schema, query)
  4. Data for a type - hypothesis_graphql.strategies.data(schema, type_name)

At the moment only schema & query are working with some limitations.

Lets take this schema as an example:

type Book {
  title: String
  author: Author
}

type Author {
  name: String
  books: [Book]
}

type Query {
  getBooks: [Book]
  getAuthors: [Author]
}

Then strategies might be used in this way:

from hypothesis import given
from hypothesis_graphql import strategies as gql_st

SCHEMA = """..."""  # the one above

@given(query=gql_st.query(schema))
def test_query(query):
    ...
    # This query might be generated:
    #
    # query {
    #   getBooks {
    #     title
    #   }
    # }

@given(response=gql_st.response(schema, query))
def test_response(response):
    ...
    # Example response with a query from the example above:
    #
    # {
    #   "data": {
    #     "getBooks": [
    #       {"title": "War and Peace"}
    #     ]
    #   }
    # }

@given(data=gql_st.data(schema, "Book"))
def test_data(data):
    ...
    # Example data:
    #
    # {
    #   "title": "War and Peace"
    #   "author": {"name": "Leo Tolstoy"}
    # }

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