How can we write tests for resolvers?

[sanket143]

Hello, I'm new to juniper and I'm loving it so far. I want to write tests but I don't know how to go around that.

pub struct DemoQuery {}

#[graphql_object(context = Context)]
impl DemoQuery {
    pub fn outputs(input: Input) -> Vec<Output> {
        vec![Output {
            id: input.id
        }]
    }
}

#[cfg(test)]
mod tests {
  use super::*;
  fn test_outputs() {
    let query = DemoQuery {};
    let input = Input { id: 12 };
    query.outputs(input); // but we can't access it like this
  }
}

What's the correct way to test these? Getting a couple of examples will be great. Thanks.

[ilslv]

You can create RootNode with an EmptyMutation and EmptySubscription and run execute on it. We do it like that in integration tests:

pub struct DemoQuery {}

#[graphql_object(context = Context)]
impl DemoQuery {
    pub fn outputs(input: Input) -> Vec<Output> {
        vec![Output {
            id: input.id
        }]
    }
}

#[cfg(test)]
mod tests {
    use juniper::{execute, graphql_value, graphql_vars, EmptyMutation, EmptySubscription, RootNode}

    use super::*;

    #[tokio::test]
    async fn resolves() {
        const QUERY: &str = r#"{
            outputs(input: ...) {
                id
            }
        }"#;

        let schema = RootNode::new(
            DemoQuery,
            EmptyMutation::new(),
            EmptySubscription::new(),
        );

        assert_eq!(
            execute(QUERY, None, &schema, &graphql_vars! {}, &()).await,
            Ok((
                graphql_value!({"humanString": {"id": "mars", "planet": "mars"}}),
                /* expected output */,
            )),
        );
    }
}

[sanket143]

got it thanks 🙌🏻