How do I run tests in this repo?

[DianaSuvorova]

Seriously and apologies if I missing something obvious

npm install && npm test from the root of the monorepo gives me import error on every test:

> graphql-tools-monorepo@ test /Users/diana.suvorova/Dev/graphql-tools
> jest --no-watchman --forceExit

 FAIL  packages/schema/tests/schemaGenerator.test.ts
  ● Test suite failed to run

    Cannot find module 'graphql-scalars' from 'packages/schema/tests/schemaGenerator.test.ts'

      3 | // see https://github.com/apollostack/graphql-tools/issues/26
      4 |
    > 5 | import {
        | ^
      6 |   typeDefs as scalarTypeDefs,
      7 |   resolvers as scalarResolvers,
      8 | } from 'graphql-scalars';

      at Resolver.resolveModule (node_modules/jest-resolve/build/resolver.js:324:11)
      at Object.<anonymous> (packages/schema/tests/schemaGenerator.test.ts:5:1)

related to this question - I would love to add test to repro the issue, but I can't mange to run them to begin this.
Thanks 🙏

[ardatan]

We use "yarn" workspaces so you need to do "yarn install" after installing yarn if you don't have it