Crucial RSpec test to include when running GraphQL

schema_rspec.rb

RSpec.describe GraphQL::Schema::Printer do
  describe '#print_schema' do
    it 'should not raise an error when called' do
      expect { GraphQL::Schema::Printer.print_schema(MyAppSchema) }.to_not raise_error
    end
  end
end

GraphQL can be really finicky. For example given the following code:

module Types
  class MutationType < Types::BaseObject
    field :some_a_mutation, mutation: Mutations::ModuleA::SomeMutation
    field :some_b_mutation, mutation: Mutations::ModuleB::SomeMutation
  end
end

Will allow you to create passing specs that test against both of these mutations but according to GraphQL Schema, this is invalid because there are two classes named SomeMuation. It doesn't matter that they're in separate modules.

Including the above test in your test suite will catch errors like this despite individually your tests are passing.