"invalid module":
  module: |
    function x
  expect: !Err "receiving on an empty and disconnected channel"

"empty module":
  module: ""
  expect: !Err "default is not a function"

"export missing":
  module: |
    export {}
  expect: !Err "default is not a function"

"export not a function":
  module: |
    export let test = bar
  expect: !Err "default is not a function"

"throw Error":
  module: |
    export default function test() {
        throw new Error("failure");
    }
  expect: !Err "Error: failure"

"throw string":
  module: |
    export default function test() {
        throw "failure";
    }
  expect: !Err "failure"

"async throw":
  module: |
    export default async function test() {
        throw "failure";
    }
  expect: !Err "failure"

"invoke function":
  module: |
    export default function test() {
        return 42;
    }
  expect: !Ok 42

"invoke async function":
  module: |
    export default async function() {
        return 42;
    }
  expect: !Ok 42

"pass multiple args":
  module: |
    export default function(a, b) {
      if (a != "A") throw "invalid a";
      if (b !=  42) throw "invalid b";
    }
  invoke:
    name: default
    args: ["A", 42]
  expect: !Ok null

"invoke fetch":
  module: |
    export default async function(url) {
        let response = await fetch(url);
        return response.status;
    }
  invoke:
    name: default
    args: ["https://www.google.com"]
  expect: !Ok 200