Merge branch 'ajk-graphql-helpers-resolve-field' into 'master'

GraphQL Helper: Make `#resolve` and `#resolve_field` fully faithful

See merge request gitlab-org/gitlab!55307

spec/graphql/features/authorization_spec.rb

@@ -2,17 +2,22 @@
 
 require 'spec_helper'
 
-RSpec.describe 'Gitlab::Graphql::Authorization' do
+RSpec.describe 'Gitlab::Graphql::Authorize' do
   include GraphqlHelpers
+  include Graphql::ResolverFactories
 
   let_it_be(:user) { create(:user) }
   let(:permission_single) { :foo }
   let(:permission_collection) { [:foo, :bar] }
   let(:test_object) { double(name: 'My name') }
   let(:query_string) { '{ item { name } }' }
-  let(:result) { execute_query(query_type)['data'] }
+  let(:result) do
+    schema = empty_schema
+    schema.use(Gitlab::Graphql::Authorize)
+    execute_query(query_type, schema: schema)
+  end
 
-  subject { result['item'] }
+  subject { result.dig('data', 'item') }
 
   shared_examples 'authorization with a single permission' do
     it 'returns the protected field when user has permission' do
@@ -55,7 +60,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
     describe 'with a single permission' do
       let(:query_type) do
         query_factory do |query|
-          query.field :item, type, null: true, resolver: simple_resolver(test_object), authorize: permission_single
+          query.field :item, type, null: true, resolver: new_resolver(test_object), authorize: permission_single
         end
       end
 
@@ -66,7 +71,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
       let(:query_type) do
         permissions = permission_collection
         query_factory do |qt|
-          qt.field :item, type, null: true, resolver: simple_resolver(test_object) do
+          qt.field :item, type, null: true, resolver: new_resolver(test_object) do
             authorize permissions
           end
         end
@@ -79,7 +84,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
   describe 'Field authorizations when field is a built in type' do
     let(:query_type) do
       query_factory do |query|
-        query.field :item, type, null: true, resolver: simple_resolver(test_object)
+        query.field :item, type, null: true, resolver: new_resolver(test_object)
       end
     end
 
@@ -132,7 +137,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
   describe 'Type authorizations' do
     let(:query_type) do
       query_factory do |query|
-        query.field :item, type, null: true, resolver: simple_resolver(test_object)
+        query.field :item, type, null: true, resolver: new_resolver(test_object)
       end
     end
 
@@ -169,7 +174,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
 
     let(:query_type) do
       query_factory do |query|
-        query.field :item, type, null: true, resolver: simple_resolver(test_object), authorize: permission_2
+        query.field :item, type, null: true, resolver: new_resolver(test_object), authorize: permission_2
       end
     end
 
@@ -188,11 +193,11 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
 
     let(:query_type) do
       query_factory do |query|
-        query.field :item, type.connection_type, null: true, resolver: simple_resolver([test_object, second_test_object])
+        query.field :item, type.connection_type, null: true, resolver: new_resolver([test_object, second_test_object])
       end
     end
 
-    subject { result.dig('item', 'edges') }
+    subject { result.dig('data', 'item', 'edges') }
 
     it 'returns only the elements visible to the user' do
       permit(permission_single)
@@ -208,7 +213,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
     describe 'limiting connections with multiple objects' do
       let(:query_type) do
         query_factory do |query|
-          query.field :item, type.connection_type, null: true, resolver: simple_resolver([test_object, second_test_object])
+          query.field :item, type.connection_type, null: true, resolver: new_resolver([test_object, second_test_object])
         end
       end
 
@@ -232,11 +237,11 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
 
     let(:query_type) do
       query_factory do |query|
-        query.field :item, [type], null: true, resolver: simple_resolver([test_object])
+        query.field :item, [type], null: true, resolver: new_resolver([test_object])
       end
     end
 
-    subject { result['item'].first }
+    subject { result.dig('data', 'item', 0) }
 
     include_examples 'authorization with a single permission'
   end
@@ -260,13 +265,13 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
       type_factory do |type|
         type.graphql_name 'FakeProjectType'
         type.field :test_issues, issue_type.connection_type, null: false,
-                   resolver: simple_resolver(Issue.where(project: [visible_project, other_project]).order(id: :asc))
+                   resolver: new_resolver(Issue.where(project: [visible_project, other_project]).order(id: :asc))
       end
     end
 
     let(:query_type) do
       query_factory do |query|
-        query.field :test_project, project_type, null: false, resolver: simple_resolver(visible_project)
+        query.field :test_project, project_type, null: false, resolver: new_resolver(visible_project)
       end
     end
 
@@ -281,7 +286,7 @@ RSpec.describe 'Gitlab::Graphql::Authorization' do
     end
 
     it 'renders the issues the user has access to' do
-      issue_edges = result['testProject']['testIssues']['edges']
+      issue_edges = result.dig('data', 'testProject', 'testIssues', 'edges')
       issue_ids = issue_edges.map { |issue_edge| issue_edge['node']&.fetch('id') }
 
       expect(issue_edges.size).to eq(visible_issues.size)

spec/graphql/features/feature_flag_spec.rb

@@ -4,6 +4,7 @@ require 'spec_helper'
 
 RSpec.describe 'Graphql Field feature flags' do
   include GraphqlHelpers
+  include Graphql::ResolverFactories
 
   let_it_be(:user) { create(:user) }
 
@@ -23,7 +24,7 @@ RSpec.describe 'Graphql Field feature flags' do
 
     let(:query_type) do
       query_factory do |query|
-        query.field :item, type, null: true, feature_flag: feature_flag, resolver: simple_resolver(test_object)
+        query.field :item, type, null: true, feature_flag: feature_flag, resolver: new_resolver(test_object)
       end
     end
 

spec/graphql/mutations/release_asset_links/create_spec.rb

@@ -21,9 +21,9 @@ RSpec.describe Mutations::ReleaseAssetLinks::Create do
   let(:args) do
     {
       project_path: project_path,
-      tag: tag,
+      tag_name: tag,
       name: name,
-      filepath: filepath,
+      direct_asset_path: filepath,
       url: url
     }
   end
@@ -44,9 +44,9 @@ RSpec.describe Mutations::ReleaseAssetLinks::Create do
 
         expect(release.links.length).to be(1)
 
-        expect(last_release_link.name).to eq(args[:name])
-        expect(last_release_link.url).to eq(args[:url])
-        expect(last_release_link.filepath).to eq(args[:filepath])
+        expect(last_release_link.name).to eq(name)
+        expect(last_release_link.url).to eq(url)
+        expect(last_release_link.filepath).to eq(filepath)
       end
     end
 

spec/graphql/resolvers/concerns/caching_array_resolver_spec.rb

@@ -9,7 +9,6 @@ RSpec.describe ::CachingArrayResolver do
   let_it_be(:admins) { create_list(:user, 4, admin: true) }
   let(:query_context) { { current_user: admins.first } }
   let(:max_page_size) { 10 }
-  let(:field) { double('Field', max_page_size: max_page_size) }
   let(:schema) do
     Class.new(GitlabSchema) do
       default_max_page_size 3
@@ -210,6 +209,6 @@ RSpec.describe ::CachingArrayResolver do
     args = { is_admin: admin }
     opts = resolver.field_options
     allow(resolver).to receive(:field_options).and_return(opts.merge(max_page_size: max_page_size))
-    resolve(resolver, args: args, ctx: query_context, schema: schema, field: field)
+    resolve(resolver, args: args, ctx: query_context, schema: schema)
   end
 end

spec/graphql/resolvers/error_tracking/sentry_errors_resolver_spec.rb

@@ -19,7 +19,7 @@ RSpec.describe Resolvers::ErrorTracking::SentryErrorsResolver do
   end
 
   describe '#resolve' do
-    context 'insufficient user permission' do
+    context 'with insufficient user permission' do
       let(:user) { create(:user) }
 
       it 'returns nil' do
@@ -29,7 +29,7 @@ RSpec.describe Resolvers::ErrorTracking::SentryErrorsResolver do
       end
     end
 
-    context 'user with permission' do
+    context 'with sufficient permission' do
       before do
         project.add_developer(current_user)
 
@@ -93,7 +93,7 @@ RSpec.describe Resolvers::ErrorTracking::SentryErrorsResolver do
         end
 
         it 'returns an externally paginated array' do
-          expect(resolve_errors).to be_a Gitlab::Graphql::ExternallyPaginatedArray
+          expect(resolve_errors).to be_a Gitlab::Graphql::Pagination::ExternallyPaginatedArrayConnection
         end
       end
     end

spec/graphql/resolvers/group_labels_resolver_spec.rb

@@ -42,7 +42,7 @@ RSpec.describe Resolvers::GroupLabelsResolver do
 
     context 'without parent' do
       it 'returns no labels' do
-        expect(resolve_labels(nil)).to eq(Label.none)
+        expect(resolve_labels(nil)).to be_empty
       end
     end
 

spec/graphql/resolvers/issues_resolver_spec.rb

@@ -264,7 +264,7 @@ RSpec.describe Resolvers::IssuesResolver do
       end
 
       it 'finds a specific issue with iid', :request_store do
-        result = batch_sync(max_queries: 4) { resolve_issues(iid: issue1.iid) }
+        result = batch_sync(max_queries: 4) { resolve_issues(iid: issue1.iid).to_a }
 
         expect(result).to contain_exactly(issue1)
       end
@@ -281,7 +281,7 @@ RSpec.describe Resolvers::IssuesResolver do
 
       it 'finds a specific issue with iids', :request_store do
         result = batch_sync(max_queries: 4) do
-          resolve_issues(iids: [issue1.iid])
+          resolve_issues(iids: [issue1.iid]).to_a
         end
 
         expect(result).to contain_exactly(issue1)
@@ -290,7 +290,7 @@ RSpec.describe Resolvers::IssuesResolver do
       it 'finds multiple issues with iids' do
         create(:issue, project: project, author: current_user)
 
-        expect(batch_sync { resolve_issues(iids: [issue1.iid, issue2.iid]) })
+        expect(batch_sync { resolve_issues(iids: [issue1.iid, issue2.iid]).to_a })
           .to contain_exactly(issue1, issue2)
       end
 
@@ -302,7 +302,7 @@ RSpec.describe Resolvers::IssuesResolver do
           create(:issue, project: another_project, iid: iid)
         end
 
-        expect(batch_sync { resolve_issues(iids: iids) }).to contain_exactly(issue1, issue2)
+        expect(batch_sync { resolve_issues(iids: iids).to_a }).to contain_exactly(issue1, issue2)
       end
     end
   end

spec/graphql/resolvers/labels_resolver_spec.rb

@@ -42,50 +42,36 @@ RSpec.describe Resolvers::LabelsResolver do
 
     context 'without parent' do
       it 'returns no labels' do
-        expect(resolve_labels(nil)).to eq(Label.none)
+        expect(resolve_labels(nil)).to be_empty
       end
     end
 
-    context 'at project level' do
+    context 'with a parent project' do
       before_all do
         group.add_developer(current_user)
       end
 
-      # because :include_ancestor_groups, :include_descendant_groups, :only_group_labels default to false
-      # the `nil` value would be equivalent to passing in `false` so just check for `nil` option
-      where(:include_ancestor_groups, :include_descendant_groups, :only_group_labels, :search_term, :test) do
-        nil     |  nil     | nil    | nil   | -> { expect(subject).to contain_exactly(label1, label2, subgroup_label1, subgroup_label2) }
-        nil     |  nil     | true   | nil   | -> { expect(subject).to contain_exactly(label1, label2, subgroup_label1, subgroup_label2) }
-        nil     |  true    | nil    | nil   | -> { expect(subject).to contain_exactly(label1, label2, subgroup_label1, subgroup_label2, sub_subgroup_label1, sub_subgroup_label2) }
-        nil     |  true    | true   | nil   | -> { expect(subject).to contain_exactly(label1, label2, subgroup_label1, subgroup_label2, sub_subgroup_label1, sub_subgroup_label2) }
-        true    |  nil     | nil    | nil   | -> { expect(subject).to contain_exactly(label1, label2, group_label1, group_label2, subgroup_label1, subgroup_label2) }
-        true    |  nil     | true   | nil   | -> { expect(subject).to contain_exactly(label1, label2, group_label1, group_label2, subgroup_label1, subgroup_label2) }
-        true    |  true    | nil    | nil   | -> { expect(subject).to contain_exactly(label1, label2, group_label1, group_label2, subgroup_label1, subgroup_label2, sub_subgroup_label1, sub_subgroup_label2) }
-        true    |  true    | true   | nil   | -> { expect(subject).to contain_exactly(label1, label2, group_label1, group_label2, subgroup_label1, subgroup_label2, sub_subgroup_label1, sub_subgroup_label2) }
-
-        nil     |  nil     | nil    | 'new'   | -> { expect(subject).to contain_exactly(label2, subgroup_label2) }
-        nil     |  nil     | true   | 'new'   | -> { expect(subject).to contain_exactly(label2, subgroup_label2) }
-        nil     |  true    | nil    | 'new'   | -> { expect(subject).to contain_exactly(label2, subgroup_label2, sub_subgroup_label2) }
-        nil     |  true    | true   | 'new'   | -> { expect(subject).to contain_exactly(label2, subgroup_label2, sub_subgroup_label2) }
-        true    |  nil     | nil    | 'new'   | -> { expect(subject).to contain_exactly(label2, group_label2, subgroup_label2) }
-        true    |  nil     | true   | 'new'   | -> { expect(subject).to contain_exactly(label2, group_label2, subgroup_label2) }
-        true    |  true    | nil    | 'new'   | -> { expect(subject).to contain_exactly(label2, group_label2, subgroup_label2, sub_subgroup_label2) }
-        true    |  true    | true   | 'new'   | -> { expect(subject).to contain_exactly(label2, group_label2, subgroup_label2, sub_subgroup_label2) }
+      # the expected result is wrapped in a lambda to get around the phase restrictions of RSpec::Parameterized
+      where(:include_ancestor_groups, :search_term, :expected_labels) do
+        nil   | nil   | -> { [label1, label2, subgroup_label1, subgroup_label2] }
+        false | nil   | -> { [label1, label2, subgroup_label1, subgroup_label2] }
+        true  | nil   | -> { [label1, label2, group_label1, group_label2, subgroup_label1, subgroup_label2] }
+        nil   | 'new' | -> { [label2, subgroup_label2] }
+        false | 'new' | -> { [label2, subgroup_label2] }
+        true  | 'new' | -> { [label2, group_label2, subgroup_label2] }
       end
 
       with_them do
         let(:params) do
           {
             include_ancestor_groups: include_ancestor_groups,
-            include_descendant_groups: include_descendant_groups,
-            only_group_labels: only_group_labels,
             search_term: search_term
           }
         end
 
         subject { resolve_labels(project, params) }
 
-        it { self.instance_exec(&test) }
+        specify { expect(subject).to match_array(instance_exec(&expected_labels)) }
       end
     end
   end

spec/graphql/resolvers/merge_requests_resolver_spec.rb

@@ -69,7 +69,7 @@ RSpec.describe Resolvers::MergeRequestsResolver do
 
       it 'batch-resolves by target project full path and IIDS', :request_store do
         result = batch_sync(max_queries: queries_per_project) do
-          resolve_mr(project, iids: [iid_1, iid_2])
+          resolve_mr(project, iids: [iid_1, iid_2]).to_a
         end
 
         expect(result).to contain_exactly(merge_request_1, merge_request_2)

spec/graphql/resolvers/release_milestones_resolver_spec.rb

@@ -14,7 +14,7 @@ RSpec.describe Resolvers::ReleaseMilestonesResolver do
 
   describe '#resolve' do
     it "uses offset-pagination" do
-      expect(resolved).to be_a(::Gitlab::Graphql::Pagination::OffsetPaginatedRelation)
+      expect(resolved).to be_a(::Gitlab::Graphql::Pagination::OffsetActiveRecordRelationConnection)
     end
 
     it "includes the release's milestones in the returned OffsetActiveRecordRelationConnection" do

spec/support/graphql/resolver_factories.rb

+# frozen_string_literal: true
+
+module Graphql
+  module ResolverFactories
+    def new_resolver(resolved_value = 'Resolved value', method: :resolve)
+      case method
+      when :resolve
+        simple_resolver(resolved_value)
+      when :find_object
+        find_object_resolver(resolved_value)
+      else
+        raise "Cannot build a resolver for #{method}"
+      end
+    end
+
+    private
+
+    def simple_resolver(resolved_value = 'Resolved value')
+      Class.new(Resolvers::BaseResolver) do
+        define_method :resolve do |**_args|
+          resolved_value
+        end
+      end
+    end
+
+    def find_object_resolver(resolved_value = 'Found object')
+      Class.new(Resolvers::BaseResolver) do
+        include ::Gitlab::Graphql::Authorize::AuthorizeResource
+
+        def resolve(**args)
+          authorized_find!(**args)
+        end
+
+        define_method :find_object do |**_args|
+          resolved_value
+        end
+      end
+    end
+  end
+end

spec/support/helpers/graphql_helpers.rb

@@ -16,32 +16,127 @@ module GraphqlHelpers
     underscored_field_name.to_s.camelize(:lower)
   end
 
-  # Run a loader's named resolver in a way that closely mimics the framework.
+  def self.deep_fieldnamerize(map)
+    map.to_h do |k, v|
+      [fieldnamerize(k), v.is_a?(Hash) ? deep_fieldnamerize(v) : v]
+    end
+  end
+
+  # Run this resolver exactly as it would be called in the framework. This
+  # includes all authorization hooks, all argument processing and all result
+  # wrapping.
+  # see: GraphqlHelpers#resolve_field
+  def resolve(
+    resolver_class, # [Class[<= BaseResolver]] The resolver at test.
+    obj: nil, # [Any] The BaseObject#object for the resolver (available as `#object` in the resolver).
+    args: {}, # [Hash] The arguments to the resolver (using client names).
+    ctx: {},  # [#to_h] The current context values.
+    schema: GitlabSchema, # [GraphQL::Schema] Schema to use during execution.
+    parent: :not_given, # A GraphQL query node to be passed as the `:parent` extra.
+    lookahead: :not_given # A GraphQL lookahead object to be passed as the `:lookahead` extra.
+  )
+    # All resolution goes through fields, so we need to create one here that
+    # uses our resolver. Thankfully, apart from the field name, resolvers
+    # contain all the configuration needed to define one.
+    field_options = resolver_class.field_options.merge(name: 'field_value')
+    field = ::Types::BaseField.new(**field_options)
+
+    # All mutations accept a single `:input` argument. Wrap arguments here.
+    # See the unwrapping below in GraphqlHelpers#resolve_field
+    args = { input: args } if resolver_class <= ::Mutations::BaseMutation && !args.key?(:input)
+
+    resolve_field(field, obj,
+                  args: args,
+                  ctx: ctx,
+                  schema: schema,
+                  object_type: resolver_parent,
+                  extras: { parent: parent, lookahead: lookahead })
+  end
+
+  # Resolve the value of a field on an object.
+  #
+  # Use this method to test individual fields within type specs.
   #
-  # First the `ready?` method is called. If it turns out that the resolver is not
-  # ready, then the early return is returned instead.
+  # e.g.
   #
-  # Then the resolve method is called.
-  def resolve(resolver_class, args: {}, lookahead: :not_given, parent: :not_given, **resolver_args)
-    args = aliased_args(resolver_class, args)
-    args[:parent] = parent unless parent == :not_given
-    args[:lookahead] = lookahead unless lookahead == :not_given
-    resolver = resolver_instance(resolver_class, **resolver_args)
-    ready, early_return = sync_all { resolver.ready?(**args) }
+  #   issue = create(:issue)
+  #   user = issue.author
+  #   project = issue.project
+  #
+  #   resolve_field(:author, issue, current_user: user, object_type: ::Types::IssueType)
+  #   resolve_field(:issue, project, args: { iid: issue.iid }, current_user: user, object_type: ::Types::ProjectType)
+  #
+  # The `object_type` defaults to the `described_class`, so when called from type specs,
+  # the above can be written as:
+  #
+  #   # In project_type_spec.rb
+  #   resolve_field(:author, issue, current_user: user)
+  #
+  #   # In issue_type_spec.rb
+  #   resolve_field(:issue, project, args: { iid: issue.iid }, current_user: user)
+  #
+  # NB: Arguments are passed from the client's perspective. If there is an argument
+  # `foo` aliased as `bar`, then we would pass `args: { bar: the_value }`, and
+  # types are checked before resolution.
+  def resolve_field(
+    field,                       # An instance of `BaseField`, or the name of a field on the current described_class
+    object,                      # The current object of the `BaseObject` this field 'belongs' to
+    args:   {},                  # Field arguments (keys will be fieldnamerized)
+    ctx:    {},                  # Context values (important ones are :current_user)
+    extras: {},                  # Stub values for field extras (parent and lookahead)
+    current_user: :not_given,    # The current user (specified explicitly, overrides ctx[:current_user])
+    schema: GitlabSchema,        # A specific schema instance
+    object_type: described_class # The `BaseObject` type this field belongs to
+  )
+    field = to_base_field(field, object_type)
+    ctx[:current_user] = current_user unless current_user == :not_given
+    query = GraphQL::Query.new(schema, context: ctx.to_h)
+    extras[:lookahead] = negative_lookahead if extras[:lookahead] == :not_given && field.extras.include?(:lookahead)
+
+    query_ctx = query.context
+
+    mock_extras(query_ctx, **extras)
+
+    parent = object_type.authorized_new(object, query_ctx)
+    raise UnauthorizedObject unless parent
+
+    # TODO: This will need to change when we move to the interpreter:
+    # At that point, arguments will be a plain ruby hash rather than
+    # an Arguments object
+    # see: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/27536
+    #      https://gitlab.com/gitlab-org/gitlab/-/issues/210556
+    arguments = field.to_graphql.arguments_class.new(
+      GraphqlHelpers.deep_fieldnamerize(args),
+      context: query_ctx,
+      defaults_used: []
+    )
+
+    # we enable the request store so we can track gitaly calls.
+    ::Gitlab::WithRequestStore.with_request_store do
+      # TODO: This will need to change when we move to the interpreter - at that
+      # point we will call `field#resolve`
 
-    return early_return unless ready
+      # Unwrap the arguments to mutations. This pairs with the wrapping in GraphqlHelpers#resolve
+      # If arguments are not wrapped first, then arguments processing will raise.
+      # If arguments are not unwrapped here, then the resolve method of the mutation will raise argument errors.
+      arguments = arguments.to_kwargs[:input] if field.resolver && field.resolver <= ::Mutations::BaseMutation
 
-    resolver.resolve(**args)
+      field.resolve_field(parent, arguments, query_ctx)
+    end
   end
 
-  # TODO: Remove this method entirely when GraphqlHelpers uses real resolve_field
-  # see: https://gitlab.com/gitlab-org/gitlab/-/issues/287791
-  def aliased_args(resolver, args)
-    definitions = resolver.arguments
+  def mock_extras(context, parent: :not_given, lookahead: :not_given)
+    allow(context).to receive(:parent).and_return(parent) unless parent == :not_given
+    allow(context).to receive(:lookahead).and_return(lookahead) unless lookahead == :not_given
+  end
 
-    args.transform_keys do |k|
-      definitions[GraphqlHelpers.fieldnamerize(k)]&.keyword || k
+  # a synthetic BaseObject type to be used in resolver specs. See `GraphqlHelpers#resolve`
+  def resolver_parent
+    @resolver_parent ||= fresh_object_type('ResolverParent')
   end
+
+  def fresh_object_type(name = 'Object')
+    Class.new(::Types::BaseObject) { graphql_name name }
   end
 
   def resolver_instance(resolver_class, obj: nil, ctx: {}, field: nil, schema: GitlabSchema)
@@ -124,9 +219,9 @@ module GraphqlHelpers
     lazy_vals.is_a?(Array) ? lazy_vals.map { |val| sync(val) } : sync(lazy_vals)
   end
 
-  def graphql_query_for(name, attributes = {}, fields = nil)
+  def graphql_query_for(name, args = {}, selection = nil)
     type = GitlabSchema.types['Query'].fields[GraphqlHelpers.fieldnamerize(name)]&.type
-    wrap_query(query_graphql_field(name, attributes, fields, type))
+    wrap_query(query_graphql_field(name, args, selection, type))
   end
 
   def wrap_query(query)
@@ -171,25 +266,6 @@ module GraphqlHelpers
     ::Gitlab::Utils::MergeHash.merge(Array.wrap(variables).map(&:to_h)).to_json
   end
 
-  def resolve_field(name, object, args = {}, current_user: nil)
-    q = GraphQL::Query.new(GitlabSchema)
-    context = GraphQL::Query::Context.new(query: q, object: object, values: { current_user: current_user })
-    allow(context).to receive(:parent).and_return(nil)
-    field = described_class.fields.fetch(GraphqlHelpers.fieldnamerize(name))
-    instance = described_class.authorized_new(object, context)
-    raise UnauthorizedObject unless instance
-
-    field.resolve_field(instance, args, context)
-  end
-
-  def simple_resolver(resolved_value = 'Resolved value')
-    Class.new(Resolvers::BaseResolver) do
-      define_method :resolve do |**_args|
-        resolved_value
-      end
-    end
-  end
-
   # Recursively convert a Hash with Ruby-style keys to GraphQL fieldname-style keys
   #
   # prepare_input_for_mutation({ 'my_key' => 1 })
@@ -558,24 +634,26 @@ module GraphqlHelpers
     end
   end
 
-  def execute_query(query_type)
-    schema = Class.new(GraphQL::Schema) do
-      use GraphQL::Pagination::Connections
-      use Gitlab::Graphql::Authorize
-      use Gitlab::Graphql::Pagination::Connections
-
-      lazy_resolve ::Gitlab::Graphql::Lazy, :force
-
-      query(query_type)
-    end
+  # assumes query_string to be let-bound in the current context
+  def execute_query(query_type, schema: empty_schema, graphql: query_string)
+    schema.query(query_type)
 
     schema.execute(
-      query_string,
+      graphql,
       context: { current_user: user },
       variables: {}
     )
   end
 
+  def empty_schema
+    Class.new(GraphQL::Schema) do
+      use GraphQL::Pagination::Connections
+      use Gitlab::Graphql::Pagination::Connections
+
+      lazy_resolve ::Gitlab::Graphql::Lazy, :force
+    end
+  end
+
   # A lookahead that selects everything
   def positive_lookahead
     double(selects?: true).tap do |selection|
@@ -589,6 +667,23 @@ module GraphqlHelpers
       allow(selection).to receive(:selection).and_return(selection)
     end
   end
+
+  private
+
+  def to_base_field(name_or_field, object_type)
+    case name_or_field
+    when ::Types::BaseField
+      name_or_field
+    else
+      field_by_name(name_or_field, object_type)
+    end
+  end
+
+  def field_by_name(name, object_type)
+    name = ::GraphqlHelpers.fieldnamerize(name)
+
+    object_type.fields[name] || (raise ArgumentError, "Unknown field #{name} for #{described_class.graphql_name}")
+  end
 end
 
 # This warms our schema, doing this as part of loading the helpers to avoid