async-graphql-test 1.0.0

A test framework for Rust GraphQL servers.
Documentation 
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use async_graphql::async_trait::async_trait;
use async_graphql::{Context, CustomDirective, Directive, ResolveFut, ServerResult, Value};

use super::MatcherError;

#[Directive(location = "Field", name = "shouldBeDefined")]
pub fn should_be_defined() -> impl CustomDirective {
    ShouldBeDefined
}

struct ShouldBeDefined;

#[async_trait]
impl CustomDirective for ShouldBeDefined {
    async fn resolve_field(
        &self,
        ctx: &Context<'_>,
        resolve: ResolveFut<'_>,
    ) -> ServerResult<Option<Value>> {
        match resolve.await {
            Ok(None) => Err(MatcherError::new(
                ctx.item.pos,
                "Received: undefined".to_string(),
            )),
            Ok(Some(other)) => Ok(Some(other)),
            Err(err) => Err(MatcherError::unexpected_error(err)),
        }
    }
}