Add and update tests

Add specs to check for designs fields
---------------------------------------

This also includes changes derived from review feedback:

* Move parameter validation to separate method
* hide private implementation
* use named parameters

Add requests to test full GraphQL lifecycle
---------------------------------------------

This adds new GraphQL feature tests to verify the ability to query for
designs and designs-at-versions throughout the graph

Add tests for pagination
----------------------------

This adds tests for pagination over designs, versions and
designs-at-versions

It also changes graphql_helpers so that attribute serialization is now
sensitive to the type of the argument (so that pagination arguments can
be passed easily), which required changes elsewhere
in the codebase.

ee/app/finders/design_management/designs_finder.rb

@@ -8,6 +8,7 @@ module DesignManagement
     # ids: integer[]
     # filenames: string[]
     # visible_at_version: ?version
+    # filenames: String[]
     def initialize(issue, current_user, params = {})
       @issue = issue
       @current_user = current_user

ee/app/graphql/resolvers/design_management/design_resolver.rb

@@ -12,15 +12,7 @@ module Resolvers
                description: 'Find a design by its filename'
 
       def resolve(filename: nil, id: nil)
-        params = if !filename.present? && !id.present?
-                   error('one of id or filename must be passed')
-                 elsif filename.present? && id.present?
-                   error('only one of id or filename may be passed')
-                 elsif filename.present?
-                   { filenames: [filename] }
-                 else
-                   { ids: [GitlabSchema.parse_gid(id, expected_type: ::DesignManagement::Design).model_id] }
-                 end
+        params = parse_args(filename, id)
 
         build_finder(params).execute.first
       end
@@ -35,17 +27,31 @@ module Resolvers
         object.issue
       end
 
-      def user
-        context[:current_user]
-      end
-
       def build_finder(params)
-        ::DesignManagement::DesignsFinder.new(issue, user, params)
+        ::DesignManagement::DesignsFinder.new(issue, current_user, params)
       end
 
       def error(msg)
         raise ::Gitlab::Graphql::Errors::ArgumentError, msg
       end
+
+      def parse_args(filename, id)
+        provided = [filename, id].map(&:present?)
+
+        if provided.none?
+          error('one of id or filename must be passed')
+        elsif provided.all?
+          error('only one of id or filename may be passed')
+        elsif filename.present?
+          { filenames: [filename] }
+        else
+          { ids: [parse_gid(id)] }
+        end
+      end
+
+      def parse_gid(gid)
+        GitlabSchema.parse_gid(gid, expected_type: ::DesignManagement::Design).model_id
+      end
     end
   end
 end

ee/app/graphql/resolvers/design_management/designs_resolver.rb

@@ -21,33 +21,30 @@ module Resolvers
         ::Resolvers::DesignManagement::DesignResolver
       end
 
-      def resolve(**args)
-        find_designs(args)
+      def resolve(ids: nil, filenames: nil, at_version: nil)
+        ::DesignManagement::DesignsFinder.new(
+          issue,
+          current_user,
+          ids: design_ids(ids),
+          filenames: filenames,
+          visible_at_version: version(at_version),
+          order: :id
+        ).execute
       end
 
       private
 
-      def version(args)
-        args[:at_version] ? GitlabSchema.object_from_id(args[:at_version])&.sync : nil
+      def version(at_version)
+        GitlabSchema.object_from_id(at_version)&.sync if at_version
       end
 
-      def design_ids(args)
-        args[:ids] ? args[:ids].map { |id| GlobalID.parse(id).model_id } : nil
+      def design_ids(ids)
+        ids&.map { |id| GlobalID.parse(id).model_id }
       end
 
       def issue
         object.issue
       end
-
-      def find_designs(args)
-        ::DesignManagement::DesignsFinder.new(
-          issue,
-          context[:current_user],
-          ids: design_ids(args),
-          filenames: args[:filenames],
-          visible_at_version: version(args)
-        ).execute
-      end
     end
   end
 end

ee/app/graphql/resolvers/design_management/versions_resolver.rb

@@ -11,6 +11,7 @@ module Resolvers
                as: :sha,
                required: false,
                description: 'The SHA256 of the most recent acceptable version'
+
       argument :earlier_or_equal_to_id, GraphQL::ID_TYPE,
                as: :id,
                required: false,
@@ -25,14 +26,17 @@ module Resolvers
         version = cutoff(parent, id, sha)
 
         raise ::Gitlab::Graphql::Errors::ResourceNotAvailable, 'cutoff not found' unless version.present?
-        return find if version == :unconstrained
 
+        if version == :unconstrained
+          find
+        else
           find(earlier_or_equal_to: version)
         end
+      end
 
       private
 
-      # Find the version most recent version that the client will accept
+      # Find the most recent version that the client will accept
       def cutoff(parent, id, sha)
         if sha.present? || id.present?
           specific_version(id, sha)

ee/spec/graphql/resolvers/design_management/design_resolver_spec.rb

 # frozen_string_literal: true
 
-require "spec_helper"
+require 'spec_helper'
 
 describe Resolvers::DesignManagement::DesignResolver do
   include GraphqlHelpers
@@ -10,7 +10,7 @@ describe Resolvers::DesignManagement::DesignResolver do
     enable_design_management
   end
 
-  describe "#resolve" do
+  describe '#resolve' do
     let_it_be(:issue) { create(:issue) }
     let_it_be(:project) { issue.project }
     let_it_be(:first_version) { create(:design_version) }
@@ -27,55 +27,55 @@ describe Resolvers::DesignManagement::DesignResolver do
       project.add_developer(current_user)
     end
 
-    context "when the user cannot see designs" do
+    context 'when the user cannot see designs' do
       let(:gql_context) { { current_user: create(:user) } }
 
-      it "returns nothing" do
+      it 'returns nothing' do
         expect(resolve_design).to be_nil
       end
     end
 
-    context "when no argument has been passed" do
+    context 'when no argument has been passed' do
       let(:args) { {} }
 
       it 'raises an error' do
-        expect { resolve_design }.to raise_error(::Gitlab::Graphql::Errors::ArgumentError)
+        expect { resolve_design }.to raise_error(::Gitlab::Graphql::Errors::ArgumentError, /must/)
       end
     end
 
-    context "when both arguments have been passed" do
+    context 'when both arguments have been passed' do
       let(:args) { { filename: first_design.filename, id: GitlabSchema.id_from_object(first_design).to_s } }
 
       it 'raises an error' do
-        expect { resolve_design }.to raise_error(::Gitlab::Graphql::Errors::ArgumentError)
+        expect { resolve_design }.to raise_error(::Gitlab::Graphql::Errors::ArgumentError, /may/)
       end
     end
 
-    context "by ID" do
-      it "returns the specified design" do
+    context 'by ID' do
+      it 'returns the specified design' do
         expect(resolve_design).to eq(first_design)
       end
 
       context 'the ID belongs to a design on another issue' do
         let(:args) { { id: GitlabSchema.id_from_object(design_on_other_issue).to_s } }
 
-        it "returns nothing" do
+        it 'returns nothing' do
           expect(resolve_design).to be_nil
         end
       end
     end
 
-    context "by filename" do
+    context 'by filename' do
       let(:args) { { filename: first_design.filename } }
 
-      it "returns the specified design" do
+      it 'returns the specified design' do
         expect(resolve_design).to eq(first_design)
       end
 
       context 'the filename belongs to a design on another issue' do
         let(:args) { { filename: design_on_other_issue.filename } }
 
-        it "returns nothing" do
+        it 'returns nothing' do
           expect(resolve_design).to be_nil
         end
       end

ee/spec/graphql/types/issue_type_spec.rb

@@ -8,4 +8,6 @@ describe GitlabSchema.types['Issue'] do
   it { expect(described_class).to have_graphql_field(:weight) }
 
   it { expect(described_class).to have_graphql_field(:designs) }
+
+  it { expect(described_class).to have_graphql_field(:design_collection) }
 end

ee/spec/requests/api/graphql/project/issue/design_collection/version_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Query.project(fullPath).issue(iid).designCollection.version(sha)' do
+  include GraphqlHelpers
+  include DesignManagementTestHelpers
+
+  let_it_be(:project) { create(:project) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:stranger) { create(:user) }
+  let_it_be(:old_version) do
+    create(:design_version, issue: issue,
+           created_designs: create_list(:design, 3, issue: issue))
+  end
+  let_it_be(:version) do
+    create(:design_version, issue: issue,
+           modified_designs: old_version.designs,
+           created_designs: create_list(:design, 2, issue: issue))
+  end
+
+  let(:current_user) { developer }
+
+  def query(vq = version_fields)
+    graphql_query_for(:project, { fullPath: project.full_path },
+      query_graphql_field(:issue, { iid: issue.iid.to_s },
+        query_graphql_field(:design_collection, nil,
+          query_graphql_field(:version, { sha: version.sha }, vq))))
+  end
+
+  let(:post_query) { post_graphql(query, current_user: current_user) }
+  let(:path_prefix) { %w[project issue designCollection version] }
+
+  let(:data) { graphql_data.dig(*path) }
+
+  before do
+    enable_design_management
+    project.add_developer(developer)
+  end
+
+  describe 'scalar fields' do
+    let(:path) { path_prefix }
+    let(:version_fields) { query_graphql_field(:sha) }
+
+    before do
+      post_query
+    end
+
+    { id: ->(x) { x.to_global_id.to_s }, sha: ->(x) { x.sha } }.each do |field, value|
+      describe ".#{field}" do
+        let(:version_fields) { query_graphql_field(field) }
+
+        it "retrieves the #{field}" do
+          expect(data).to match(a_hash_including(field.to_s => value[version]))
+        end
+      end
+    end
+  end
+
+  describe 'design_at_version' do
+    let(:path) { path_prefix + %w[designAtVersion] }
+    let(:design) { issue.designs.visible_at_version(version).to_a.sample }
+    let(:design_at_version) { build(:design_at_version, design: design, version: version) }
+
+    let(:version_fields) do
+      query_graphql_field(:design_at_version, dav_params, 'id filename')
+    end
+
+    shared_examples :finds_dav do
+      it 'finds all the designs as of the given version' do
+        post_query
+
+        expect(data).to match(
+          a_hash_including(
+            'id' => global_id_of(design_at_version),
+            'filename' => design.filename
+          ))
+      end
+
+      context 'when the current_user is not authorized' do
+        let(:current_user) { stranger }
+
+        it 'returns nil' do
+          post_query
+
+          expect(data).to be_nil
+        end
+      end
+    end
+
+    context 'by ID' do
+      let(:dav_params) { { id: global_id_of(design_at_version) } }
+
+      include_examples :finds_dav
+    end
+
+    context 'by filename' do
+      let(:dav_params) { { filename: design.filename } }
+
+      include_examples :finds_dav
+    end
+
+    context 'by design_id' do
+      let(:dav_params) { { design_id: global_id_of(design) } }
+
+      include_examples :finds_dav
+    end
+  end
+
+  describe 'designs_at_version' do
+    let(:path) { path_prefix + %w[designsAtVersion edges] }
+    let(:version_fields) do
+      query_graphql_field(:designs_at_version, dav_params, 'edges { node { id filename } }')
+    end
+
+    let(:dav_params) { nil }
+
+    let(:results) do
+      issue.designs.visible_at_version(version).map do |d|
+        dav = build(:design_at_version, design: d, version: version)
+        { 'id' => global_id_of(dav), 'filename' => d.filename }
+      end
+    end
+
+    it 'finds all the designs as of the given version' do
+      post_query
+
+      expect(data.pluck('node')).to match_array(results)
+    end
+
+    describe 'filtering' do
+      let(:designs) { issue.designs.sample(3) }
+      let(:filenames) { designs.map(&:filename) }
+      let(:ids) do
+        designs.map { |d| global_id_of(build(:design_at_version, design: d, version: version)) }
+      end
+
+      before do
+        post_query
+      end
+
+      describe 'by filename' do
+        let(:dav_params) { { filenames: filenames } }
+
+        it 'finds the designs by filename' do
+          expect(data.map { |e| e.dig('node', 'id') }).to match_array(ids)
+        end
+      end
+
+      describe 'by design-id' do
+        let(:dav_params) { { ids: designs.map { |d| global_id_of(d) } } }
+
+        it 'finds the designs by id' do
+          expect(data.map { |e| e.dig('node', 'filename') }).to match_array(filenames)
+        end
+      end
+    end
+
+    describe 'pagination' do
+      let(:end_cursor) { graphql_data_at(*path_prefix, :designs_at_version, :page_info, :end_cursor) }
+
+      let(:ids) do
+        ::DesignManagement::Design.visible_at_version(version).order(:id).map do |d|
+          global_id_of(build(:design_at_version, design: d, version: version))
+        end
+      end
+
+      let(:version_fields) do
+        query_graphql_field(:designs_at_version, { first: 2 }, fields)
+      end
+
+      let(:cursored_query) do
+        frag = query_graphql_field(:designs_at_version, { after: end_cursor }, fields)
+        query(frag)
+      end
+
+      let(:fields) { ['pageInfo { endCursor }', 'edges { node { id } }'] }
+
+      def response_values(data = graphql_data)
+        data.dig(*path).map { |e| e.dig('node', 'id') }
+      end
+
+      it 'sorts designs for reliable pagination' do
+        post_graphql(query, current_user: current_user)
+
+        expect(response_values).to match_array(ids.take(2))
+
+        post_graphql(cursored_query, current_user: current_user)
+
+        new_data = JSON.parse(response.body).fetch('data')
+
+        expect(response_values(new_data)).to match_array(ids.drop(2))
+      end
+    end
+  end
+
+  describe 'designs' do
+    let(:path) { path_prefix + %w[designs edges] }
+    let(:version_fields) do
+      query_graphql_field(:designs, nil, 'edges { node { id filename } }')
+    end
+
+    let(:results) do
+      version.designs.map do |design|
+        { 'id' => global_id_of(design), 'filename' => design.filename }
+      end
+    end
+
+    it 'finds all the designs as of the given version' do
+      post_query
+
+      expect(data.pluck('node')).to match_array(results)
+    end
+  end
+end

ee/spec/requests/api/graphql/project/issue/design_collection/versions_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Getting versions related to an issue' do
+  include GraphqlHelpers
+  include DesignManagementTestHelpers
+
+  let_it_be(:issue) { create(:issue) }
+
+  let_it_be(:version_a) do
+    create(:design_version, issue: issue)
+  end
+  let_it_be(:version_b) do
+    create(:design_version, issue: issue)
+  end
+  let_it_be(:version_c) do
+    create(:design_version, issue: issue)
+  end
+  let_it_be(:version_d) do
+    create(:design_version, issue: issue)
+  end
+
+  let_it_be(:owner) { issue.project.owner }
+
+  def version_query(params = version_params)
+    query_graphql_field(:versions, params, version_query_fields)
+  end
+
+  let(:version_params) { nil }
+
+  let(:version_query_fields) { ['edges { node { sha } }'] }
+
+  let(:project) { issue.project }
+  let(:current_user) { owner }
+
+  let(:query) { make_query }
+
+  def make_query(vq = version_query)
+    graphql_query_for(:project, { fullPath: project.full_path },
+      query_graphql_field(:issue, { iid: issue.iid.to_s },
+        query_graphql_field(:design_collection, {}, vq)))
+  end
+
+  let(:design_collection) do
+    graphql_data_at(:project, :issue, :design_collection)
+  end
+
+  def response_values(data = graphql_data, key = 'sha')
+    path = %w[project issue designCollection versions edges]
+    data.dig(*path).map { |e| e.dig('node', key) }
+  end
+
+  before do
+    enable_design_management
+  end
+
+  it 'returns the design filename' do
+    post_graphql(query, current_user: current_user)
+
+    expect(response_values).to match_array([version_a, version_b, version_c, version_d].map(&:sha))
+  end
+
+  describe 'filter by sha' do
+    let(:sha) { version_b.sha }
+
+    let(:version_params) { { earlier_or_equal_to_sha: sha } }
+
+    it 'finds only those versions at or before the given cut-off' do
+      post_graphql(query, current_user: current_user)
+
+      expect(response_values).to contain_exactly(version_a.sha, version_b.sha)
+    end
+  end
+
+  describe 'filter by id' do
+    let(:id) { global_id_of(version_c) }
+
+    let(:version_params) { { earlier_or_equal_to_id: id } }
+
+    it 'finds only those versions at or before the given cut-off' do
+      post_graphql(query, current_user: current_user)
+
+      expect(response_values).to contain_exactly(version_a.sha, version_b.sha, version_c.sha)
+    end
+  end
+
+  describe 'pagination' do
+    let(:end_cursor) { design_collection.dig('versions', 'pageInfo', 'endCursor') }
+
+    let(:ids) { issue.design_collection.versions.ordered.map(&:sha) }
+
+    let(:query) { make_query(version_query(first: 2)) }
+
+    let(:cursored_query) do
+      make_query(version_query(after: end_cursor))
+    end
+
+    let(:version_query_fields) { ['pageInfo { endCursor }', 'edges { node { sha } }'] }
+
+    it 'sorts designs for reliable pagination' do
+      post_graphql(query, current_user: current_user)
+
+      expect(response_values).to match_array(ids.take(2))
+
+      post_graphql(cursored_query, current_user: current_user)
+
+      new_data = JSON.parse(response.body).fetch('data')
+
+      expect(response_values(new_data)).to match_array(ids.drop(2))
+    end
+  end
+end

ee/spec/requests/api/graphql/project/issue/designs/notes_spec.rb

@@ -60,7 +60,7 @@ describe 'Getting designs related to an issue' do
       { 'fullPath' => design.project.full_path },
       query_graphql_field(
         'issue',
-        { iid: design.issue.iid },
+        { iid: design.issue.iid.to_s },
         query_graphql_field(
           'designs', {}, design_node
         )

ee/spec/requests/api/graphql/project/issue_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Query.project(fullPath).issue(iid)' do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let_it_be(:issue_b) { create(:issue, project: project) }
+  let_it_be(:developer) { create(:user) }
+  let(:current_user) { developer }
+
+  let_it_be(:project_params) { { 'fullPath' => project.full_path } }
+  let_it_be(:issue_params) { { 'iid' => issue.iid.to_s } }
+  let_it_be(:issue_fields) { 'title' }
+
+  let(:query) do
+    graphql_query_for('project', project_params, project_fields)
+  end
+
+  let(:project_fields) do
+    query_graphql_field(:issue, issue_params, issue_fields)
+  end
+
+  shared_examples 'being able to fetch a design-like object by ID' do
+    let(:design) { design_a }
+    let(:path) { %w[project issue designCollection] + [GraphqlHelpers.fieldnamerize(object_field_name)] }
+
+    let(:design_fields) do
+      [
+        query_graphql_field(:filename),
+        query_graphql_field(:project, nil, query_graphql_field(:id))
+      ]
+    end
+
+    let(:design_collection_fields) do
+      query_graphql_field(object_field_name, object_params, object_fields)
+    end
+
+    let(:object_fields) { design_fields }
+
+    context 'the ID is passed' do
+      let(:object_params) { { id: global_id_of(object) } }
+      let(:result_fields) { {} }
+
+      let(:expected_fields) do
+        result_fields.merge({ 'filename' => design.filename, 'project' => id_hash(project) })
+      end
+
+      it 'retrieves the object' do
+        post_query
+
+        data = graphql_data.dig(*path)
+
+        expect(data).to match(a_hash_including(expected_fields))
+      end
+
+      context 'the user is unauthorized' do
+        let(:current_user) { create(:user) }
+
+        it_behaves_like 'a failure to find anything'
+      end
+    end
+
+    context 'without parameters' do
+      let(:object_params) { nil }
+
+      it 'raises an error' do
+        post_query
+
+        expect(graphql_errors).to include(no_argument_error)
+      end
+    end
+
+    context 'attempting to retrieve an object from a different issue' do
+      let(:object_params) { { id: global_id_of(object_on_other_issue) } }
+
+      it_behaves_like 'a failure to find anything'
+    end
+  end
+
+  before do
+    project.add_developer(developer)
+  end
+
+  let(:post_query) { post_graphql(query, current_user: current_user) }
+
+  describe '.designCollection' do
+    include DesignManagementTestHelpers
+
+    let_it_be(:design_a) { create(:design, issue: issue) }
+    let_it_be(:version_a) { create(:design_version, issue: issue, created_designs: [design_a]) }
+
+    let(:issue_fields) do
+      query_graphql_field(:design_collection, dc_params, design_collection_fields)
+    end
+
+    let(:dc_params) { nil }
+    let(:design_collection_fields) { nil }
+
+    before do
+      enable_design_management
+    end
+
+    describe '.design' do
+      let(:object) { design }
+      let(:object_field_name) { :design }
+
+      let(:no_argument_error) do
+        custom_graphql_error(path, a_string_matching(%r/id or filename/))
+      end
+
+      let_it_be(:object_on_other_issue) { create(:design, issue: issue_b) }
+
+      it_behaves_like 'being able to fetch a design-like object by ID'
+
+      it_behaves_like 'being able to fetch a design-like object by ID' do
+        let(:object_params) { { filename: design.filename } }
+      end
+    end
+
+    describe '.version' do
+      let(:version) { version_a }
+      let(:path) { %w[project issue designCollection version] }
+
+      let(:design_collection_fields) do
+        query_graphql_field(:version, version_params, 'id sha')
+      end
+
+      context 'no parameters' do
+        let(:version_params) { nil }
+
+        it 'raises an error' do
+          post_query
+
+          expect(graphql_errors).to include(custom_graphql_error(path, a_string_matching(%r/id or sha/)))
+        end
+      end
+
+      shared_examples 'a successful query for a version' do
+        it 'finds the version' do
+          post_query
+
+          data = graphql_data.dig(*path)
+
+          expect(data).to match(
+            a_hash_including('id' => global_id_of(version),
+                             'sha' => version.sha)
+          )
+        end
+      end
+
+      context '(sha: STRING_TYPE)' do
+        let(:version_params) { { sha: version.sha } }
+
+        it_behaves_like 'a successful query for a version'
+      end
+
+      context '(id: ID_TYPE)' do
+        let(:version_params) { { id: global_id_of(version) } }
+
+        it_behaves_like 'a successful query for a version'
+      end
+    end
+
+    describe '.designAtVersion' do
+      it_behaves_like 'being able to fetch a design-like object by ID' do
+        let(:object) { build(:design_at_version, design: design, version: version) }
+        let(:object_field_name) { :design_at_version }
+
+        let(:version) { version_a }
+
+        let(:result_fields) { { 'version' => id_hash(version) } }
+        let(:object_fields) do
+          design_fields + [query_graphql_field(:version, nil, query_graphql_field(:id))]
+        end
+
+        let(:no_argument_error) { missing_required_argument(path, :id) }
+
+        let(:object_on_other_issue) { build(:design_at_version, issue: issue_b) }
+      end
+    end
+  end
+
+  def id_hash(object)
+    a_hash_including('id' => global_id_of(object))
+  end
+end

ee/spec/requests/api/graphql/query_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Query' do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project) }
+  let_it_be(:issue) { create(:issue, project: project) }
+  let_it_be(:developer) { create(:user) }
+  let(:current_user) { developer }
+
+  describe '.designManagement' do
+    include DesignManagementTestHelpers
+
+    let_it_be(:version) { create(:design_version, issue: issue) }
+    let_it_be(:design) { version.designs.first }
+    let(:query_result) { graphql_data.dig(*path) }
+    let(:query) { graphql_query_for(:design_management, nil, dm_fields) }
+
+    before do
+      enable_design_management
+      project.add_developer(developer)
+      post_graphql(query, current_user: current_user)
+    end
+
+    shared_examples 'a query that needs authorization' do
+      context 'the current user is not able to read designs' do
+        let(:current_user) { create(:user) }
+
+        it 'does not retrieve the record' do
+          expect(query_result).to be_nil
+        end
+
+        it 'raises an error' do
+          expect(graphql_errors).to include(
+            a_hash_including('message' => a_string_matching(%r{you don't have permission}))
+          )
+        end
+      end
+    end
+
+    describe '.version' do
+      let(:path) { %w[designManagement version] }
+
+      let(:dm_fields) do
+        query_graphql_field(:version, { 'id' => global_id_of(version) }, 'id sha')
+      end
+
+      it_behaves_like 'a working graphql query'
+      it_behaves_like 'a query that needs authorization'
+
+      context 'the current user is able to read designs' do
+        it 'fetches the expected data' do
+          expect(query_result).to eq('id' => global_id_of(version), 'sha' => version.sha)
+        end
+      end
+    end
+
+    describe '.designAtVersion' do
+      let_it_be(:design_at_version) do
+        ::DesignManagement::DesignAtVersion.new(design: design, version: version)
+      end
+
+      let(:path) { %w[designManagement designAtVersion] }
+
+      let(:dm_fields) do
+        query_graphql_field(:design_at_version, { 'id' => global_id_of(design_at_version) }, <<~FIELDS)
+          id
+          filename
+          version { id sha }
+          design { id }
+          issue { title iid }
+          project { id fullPath }
+        FIELDS
+      end
+
+      it_behaves_like 'a working graphql query'
+      it_behaves_like 'a query that needs authorization'
+
+      context 'the current user is able to read designs' do
+        it 'fetches the expected data, including the correct associations' do
+          expect(query_result).to eq(
+            'id' => global_id_of(design_at_version),
+            'filename' => design_at_version.design.filename,
+            'version' => { 'id' => global_id_of(version), 'sha' => version.sha },
+            'design'  => { 'id' => global_id_of(design) },
+            'issue'   => { 'title' => issue.title, 'iid' => issue.iid.to_s },
+            'project' => { 'id' => global_id_of(project), 'fullPath' => project.full_path }
+          )
+        end
+      end
+    end
+  end
+end

spec/requests/api/graphql/project/merge_request_spec.rb

@@ -14,7 +14,7 @@ describe 'getting merge request information nested in a project' do
     graphql_query_for(
       'project',
       { 'fullPath' => project.full_path },
-      query_graphql_field('mergeRequest', iid: merge_request.iid)
+      query_graphql_field('mergeRequest', iid: merge_request.iid.to_s)
     )
   end
 

spec/requests/api/graphql/tasks/task_completion_status_spec.rb

@@ -25,7 +25,7 @@ describe 'getting task completion status information' do
     graphql_query_for(
       'project',
         { 'fullPath' => project.full_path },
-        query_graphql_field(type, { iid: iid }, fields)
+        query_graphql_field(type, { iid: iid.to_s }, fields)
     )
   end
 

spec/support/helpers/graphql_helpers.rb

@@ -177,16 +177,26 @@ module GraphqlHelpers
 
   def attributes_to_graphql(attributes)
     attributes.map do |name, value|
-      value_str = if value.is_a?(Array)
-                    '["' + value.join('","') + '"]'
-                  else
-                    "\"#{value}\""
-                  end
+      value_str = as_graphql_literal(value)
 
       "#{GraphqlHelpers.fieldnamerize(name.to_s)}: #{value_str}"
     end.join(", ")
   end
 
+  # Fairly dumb Ruby => GraphQL rendering function. Only suitable for testing.
+  # Missing support for Enums (feel free to add if you need it).
+  def as_graphql_literal(value)
+    case value
+    when Array then "[#{value.map { |v| as_graphql_literal(v) }.join(',')}]"
+    when Integer, Float then value.to_s
+    when String then "\"#{value.gsub(/"/, '\\"')}\""
+    when nil then 'null'
+    when true then 'true'
+    when false then 'false'
+    else raise ArgumentError, "Cannot represent #{value} as GraphQL literal"
+    end
+  end
+
   def post_multiplex(queries, current_user: nil, headers: {})
     post api('/', current_user, version: 'graphql'), params: { _json: queries }, headers: headers
   end
@@ -229,6 +239,11 @@ module GraphqlHelpers
     json_response['data'] || (raise NoData, graphql_errors)
   end
 
+  def graphql_data_at(*path)
+    keys = path.map { |segment| GraphqlHelpers.fieldnamerize(segment) }
+    graphql_data.dig(*keys)
+  end
+
   def graphql_errors
     case json_response
     when Hash # regular query