Test that verifies the logic of graphql mutation for project updating. This code snippet is from the article originally published on RubyGarage’s blog: https://rubygarage.org/blog/graphql-and-trailblazer-tutorial

update_spec.rb

require 'support/schemas/projects/update'
 
  RSpec.describe GraphqlsController, type: :controller do
   let(:user) { create :user }
   let!(:project) { create :project, user: user }
 
    describe 'POST #create' do
     let(:mutation) do
       '
         mutation($id: ID!, $title: String!) {
           projectUpdate(input: {
             id: $id,
             title: $title
           }) {
             project {
               id,
               title
               createdAt
               updatedAt
             },
             errors {
               messages,
               path
             }
           }
         }
       '
     end
 
      context 'unauthenticated' do
       let(:variables) do
         {
           id: project.id,
           title: ''
         }
       end
 
        before { post :create, params: { query: mutation, variables: variables } }
 
        it 'has errors' do
         expect(response).to match_schema(UpdateProjectSchema::NotAuthenticated)
         expect(response).to be_ok
       end
     end
 
      context 'authenticated' do
       before { sign_in user }
 
        context 'fail' do
         context 'wrong project id' do
           let(:variables) do
             {
               id: 0,
               title: ''
             }
           end
 
            before { post :create, params: { query: mutation, variables: variables } }
 
            it 'has errors' do
             expect(response).to match_schema(UpdateProjectSchema::NotFound)
             expect(response).to be_ok
           end
         end
 
          context 'invalid params' do
           let(:variables) do
             {
               id: project.id,
               title: ''
             }
           end
 
            before { post :create, params: { query: mutation, variables: variables } }
 
            it 'has errors' do
             expect(response).to match_schema(UpdateProjectSchema::Error)
             expect(response).to be_ok
           end
         end
       end
 
        context 'success' do
         let(:variables) do
           {
             id: project.id,
             title: FFaker::DizzleIpsum.word
           }
         end
 
          before { post :create, params: { query: mutation, variables: variables } }
 
          it 'update project' do
           expect(response).to match_schema(UpdateProjectSchema::Success)
           expect(response).to be_ok
         end
       end
     end
   end
 end