Merge branch '31919-graphql-MR-label-mutation' into 'master'

GraphQL: Create MR mutations needed for the sidebar

See merge request gitlab-org/gitlab!19913

app/graphql/mutations/merge_requests/set_labels.rb

+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class SetLabels < Base
+      graphql_name 'MergeRequestSetLabels'
+
+      argument :label_ids,
+               [GraphQL::ID_TYPE],
+               required: true,
+               description: <<~DESC
+                            The Label IDs to set. Replaces existing labels by default.
+               DESC
+
+      argument :operation_mode,
+               Types::MutationOperationModeEnum,
+               required: false,
+               description: <<~DESC
+                            Changes the operation mode. Defaults to REPLACE.
+               DESC
+
+      def resolve(project_path:, iid:, label_ids:, operation_mode: Types::MutationOperationModeEnum.enum[:replace])
+        merge_request = authorized_find!(project_path: project_path, iid: iid)
+        project = merge_request.project
+
+        label_ids = label_ids
+                      .select(&method(:label_descendant?))
+                      .map { |gid| GlobalID.parse(gid).model_id } # MergeRequests::UpdateService expects integers
+
+        attribute_name = case operation_mode
+                         when Types::MutationOperationModeEnum.enum[:append]
+                           :add_label_ids
+                         when Types::MutationOperationModeEnum.enum[:remove]
+                           :remove_label_ids
+                         else
+                           :label_ids
+                         end
+
+        ::MergeRequests::UpdateService.new(project, current_user, attribute_name => label_ids)
+          .execute(merge_request)
+
+        {
+          merge_request: merge_request,
+          errors: merge_request.errors.full_messages
+        }
+      end
+
+      def label_descendant?(gid)
+        GlobalID.parse(gid)&.model_class&.ancestors&.include?(Label)
+      end
+    end
+  end
+end

app/graphql/mutations/merge_requests/set_locked.rb

+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class SetLocked < Base
+      graphql_name 'MergeRequestSetLocked'
+
+      argument :locked,
+               GraphQL::BOOLEAN_TYPE,
+               required: true,
+               description: <<~DESC
+                            Whether or not to lock the merge request.
+               DESC
+
+      def resolve(project_path:, iid:, locked:)
+        merge_request = authorized_find!(project_path: project_path, iid: iid)
+        project = merge_request.project
+
+        ::MergeRequests::UpdateService.new(project, current_user, discussion_locked: locked)
+          .execute(merge_request)
+
+        {
+          merge_request: merge_request,
+          errors: merge_request.errors.full_messages
+        }
+      end
+    end
+  end
+end

app/graphql/mutations/merge_requests/set_subscription.rb

+# frozen_string_literal: true
+
+module Mutations
+  module MergeRequests
+    class SetSubscription < Base
+      graphql_name 'MergeRequestSetSubscription'
+
+      argument :subscribed_state,
+               GraphQL::BOOLEAN_TYPE,
+               required: true,
+               description: 'The desired state of the subscription'
+
+      def resolve(project_path:, iid:, subscribed_state:)
+        merge_request = authorized_find!(project_path: project_path, iid: iid)
+        project = merge_request.project
+
+        merge_request.set_subscription(current_user, subscribed_state, project)
+
+        {
+          merge_request: merge_request,
+          errors: merge_request.errors.full_messages
+        }
+      end
+    end
+  end
+end

app/graphql/types/label_type.rb

@@ -6,6 +6,8 @@ module Types
 
     authorize :read_label
 
+    field :id, GraphQL::ID_TYPE, null: false,
+          description: 'Label ID'
     field :description, GraphQL::STRING_TYPE, null: true,
           description: 'Description of the label (markdown rendered as HTML for caching)'
     markdown_field :description_html, null: true

app/graphql/types/mutation_type.rb

@@ -9,7 +9,10 @@ module Types
     mount_mutation Mutations::AwardEmojis::Add
     mount_mutation Mutations::AwardEmojis::Remove
     mount_mutation Mutations::AwardEmojis::Toggle
+    mount_mutation Mutations::MergeRequests::SetLabels
+    mount_mutation Mutations::MergeRequests::SetLocked
     mount_mutation Mutations::MergeRequests::SetMilestone
+    mount_mutation Mutations::MergeRequests::SetSubscription
     mount_mutation Mutations::MergeRequests::SetWip, calls_gitaly: true
     mount_mutation Mutations::MergeRequests::SetAssignees
     mount_mutation Mutations::Notes::Create::Note, calls_gitaly: true

changelogs/unreleased/31919-graphql-MR-label-mutation.yml

+---
+title: 'GraphQL: Create MR mutations needed for the sidebar'
+merge_request: 19913
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2814,6 +2814,11 @@ type Label {
   """
   descriptionHtml: String
 
+  """
+  Label ID
+  """
+  id: ID!
+
   """
   Text color of the label
   """
@@ -3407,6 +3412,101 @@ type MergeRequestSetAssigneesPayload {
   mergeRequest: MergeRequest
 }
 
+"""
+Autogenerated input type of MergeRequestSetLabels
+"""
+input MergeRequestSetLabelsInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  The iid of the merge request to mutate
+  """
+  iid: String!
+
+  """
+  The Label IDs to set. Replaces existing labels by default.
+  """
+  labelIds: [ID!]!
+
+  """
+  Changes the operation mode. Defaults to REPLACE.
+  """
+  operationMode: MutationOperationMode
+
+  """
+  The project the merge request to mutate is in
+  """
+  projectPath: ID!
+}
+
+"""
+Autogenerated return type of MergeRequestSetLabels
+"""
+type MergeRequestSetLabelsPayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  Reasons why the mutation failed.
+  """
+  errors: [String!]!
+
+  """
+  The merge request after mutation
+  """
+  mergeRequest: MergeRequest
+}
+
+"""
+Autogenerated input type of MergeRequestSetLocked
+"""
+input MergeRequestSetLockedInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  The iid of the merge request to mutate
+  """
+  iid: String!
+
+  """
+  Whether or not to lock the merge request.
+  """
+  locked: Boolean!
+
+  """
+  The project the merge request to mutate is in
+  """
+  projectPath: ID!
+}
+
+"""
+Autogenerated return type of MergeRequestSetLocked
+"""
+type MergeRequestSetLockedPayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  Reasons why the mutation failed.
+  """
+  errors: [String!]!
+
+  """
+  The merge request after mutation
+  """
+  mergeRequest: MergeRequest
+}
+
 """
 Autogenerated input type of MergeRequestSetMilestone
 """
@@ -3452,6 +3552,51 @@ type MergeRequestSetMilestonePayload {
   mergeRequest: MergeRequest
 }
 
+"""
+Autogenerated input type of MergeRequestSetSubscription
+"""
+input MergeRequestSetSubscriptionInput {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  The iid of the merge request to mutate
+  """
+  iid: String!
+
+  """
+  The project the merge request to mutate is in
+  """
+  projectPath: ID!
+
+  """
+  The desired state of the subscription
+  """
+  subscribedState: Boolean!
+}
+
+"""
+Autogenerated return type of MergeRequestSetSubscription
+"""
+type MergeRequestSetSubscriptionPayload {
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  Reasons why the mutation failed.
+  """
+  errors: [String!]!
+
+  """
+  The merge request after mutation
+  """
+  mergeRequest: MergeRequest
+}
+
 """
 Autogenerated input type of MergeRequestSetWip
 """
@@ -3588,7 +3733,10 @@ type Mutation {
   epicSetSubscription(input: EpicSetSubscriptionInput!): EpicSetSubscriptionPayload
   epicTreeReorder(input: EpicTreeReorderInput!): EpicTreeReorderPayload
   mergeRequestSetAssignees(input: MergeRequestSetAssigneesInput!): MergeRequestSetAssigneesPayload
+  mergeRequestSetLabels(input: MergeRequestSetLabelsInput!): MergeRequestSetLabelsPayload
+  mergeRequestSetLocked(input: MergeRequestSetLockedInput!): MergeRequestSetLockedPayload
   mergeRequestSetMilestone(input: MergeRequestSetMilestoneInput!): MergeRequestSetMilestonePayload
+  mergeRequestSetSubscription(input: MergeRequestSetSubscriptionInput!): MergeRequestSetSubscriptionPayload
   mergeRequestSetWip(input: MergeRequestSetWipInput!): MergeRequestSetWipPayload
   removeAwardEmoji(input: RemoveAwardEmojiInput!): RemoveAwardEmojiPayload
   todoMarkDone(input: TodoMarkDoneInput!): TodoMarkDonePayload

doc/api/graphql/reference/index.md

@@ -410,6 +410,7 @@ The API can be explored interactively using the [GraphiQL IDE](../index.md#graph
 
 | Name  | Type  | Description |
 | ---   |  ---- | ----------  |
+| `id` | ID! | Label ID |
 | `description` | String | Description of the label (markdown rendered as HTML for caching) |
 | `descriptionHtml` | String | The GitLab Flavored Markdown rendering of `description` |
 | `title` | String! | Content of the label |
@@ -491,6 +492,22 @@ The API can be explored interactively using the [GraphiQL IDE](../index.md#graph
 | `errors` | String! => Array | Reasons why the mutation failed. |
 | `mergeRequest` | MergeRequest | The merge request after mutation |
 
+### MergeRequestSetLabelsPayload
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `clientMutationId` | String | A unique identifier for the client performing the mutation. |
+| `errors` | String! => Array | Reasons why the mutation failed. |
+| `mergeRequest` | MergeRequest | The merge request after mutation |
+
+### MergeRequestSetLockedPayload
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `clientMutationId` | String | A unique identifier for the client performing the mutation. |
+| `errors` | String! => Array | Reasons why the mutation failed. |
+| `mergeRequest` | MergeRequest | The merge request after mutation |
+
 ### MergeRequestSetMilestonePayload
 
 | Name  | Type  | Description |
@@ -499,6 +516,14 @@ The API can be explored interactively using the [GraphiQL IDE](../index.md#graph
 | `errors` | String! => Array | Reasons why the mutation failed. |
 | `mergeRequest` | MergeRequest | The merge request after mutation |
 
+### MergeRequestSetSubscriptionPayload
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `clientMutationId` | String | A unique identifier for the client performing the mutation. |
+| `errors` | String! => Array | Reasons why the mutation failed. |
+| `mergeRequest` | MergeRequest | The merge request after mutation |
+
 ### MergeRequestSetWipPayload
 
 | Name  | Type  | Description |

spec/graphql/mutations/merge_requests/set_labels_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Mutations::MergeRequests::SetLabels do
+  let(:merge_request) { create(:merge_request) }
+  let(:user) { create(:user) }
+  subject(:mutation) { described_class.new(object: nil, context: { current_user: user }) }
+
+  describe '#resolve' do
+    let(:label) { create(:label, project: merge_request.project) }
+    let(:label2) { create(:label, project: merge_request.project) }
+    let(:label_ids) { [label.to_global_id] }
+    let(:mutated_merge_request) { subject[:merge_request] }
+    subject { mutation.resolve(project_path: merge_request.project.full_path, iid: merge_request.iid, label_ids: label_ids) }
+
+    it 'raises an error if the resource is not accessible to the user' do
+      expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+    end
+
+    context 'when the user can update the merge request' do
+      before do
+        merge_request.project.add_developer(user)
+      end
+
+      it 'sets the labels, removing all others' do
+        merge_request.update!(labels: [label2])
+
+        expect(mutated_merge_request).to eq(merge_request)
+        expect(mutated_merge_request.labels).to contain_exactly(label)
+        expect(subject[:errors]).to be_empty
+      end
+
+      it 'returns errors merge request could not be updated' do
+        # Make the merge request invalid
+        merge_request.allow_broken = true
+        merge_request.update!(source_project: nil)
+
+        expect(subject[:errors]).not_to be_empty
+      end
+
+      context 'when passing an empty array' do
+        let(:label_ids) { [] }
+
+        it 'removes all labels' do
+          merge_request.update!(labels: [label])
+
+          expect(mutated_merge_request.labels).to be_empty
+        end
+      end
+
+      context 'when passing operation_mode as APPEND' do
+        subject { mutation.resolve(project_path: merge_request.project.full_path, iid: merge_request.iid, label_ids: label_ids, operation_mode: Types::MutationOperationModeEnum.enum[:append]) }
+
+        it 'sets the labels, without removing others' do
+          merge_request.update!(labels: [label2])
+
+          expect(mutated_merge_request).to eq(merge_request)
+          expect(mutated_merge_request.labels).to contain_exactly(label, label2)
+          expect(subject[:errors]).to be_empty
+        end
+      end
+
+      context 'when passing operation_mode as REMOVE' do
+        subject { mutation.resolve(project_path: merge_request.project.full_path, iid: merge_request.iid, label_ids: label_ids, operation_mode: Types::MutationOperationModeEnum.enum[:remove])}
+
+        it 'removes the labels, without removing others' do
+          merge_request.update!(labels: [label, label2])
+
+          expect(mutated_merge_request).to eq(merge_request)
+          expect(mutated_merge_request.labels).to contain_exactly(label2)
+          expect(subject[:errors]).to be_empty
+        end
+      end
+    end
+  end
+end

spec/graphql/mutations/merge_requests/set_locked_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Mutations::MergeRequests::SetLocked do
+  let(:merge_request) { create(:merge_request) }
+  let(:user) { create(:user) }
+  subject(:mutation) { described_class.new(object: nil, context: { current_user: user }) }
+
+  describe '#resolve' do
+    let(:locked) { true }
+    let(:mutated_merge_request) { subject[:merge_request] }
+    subject { mutation.resolve(project_path: merge_request.project.full_path, iid: merge_request.iid, locked: locked) }
+
+    it 'raises an error if the resource is not accessible to the user' do
+      expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+    end
+
+    context 'when the user can update the merge request' do
+      before do
+        merge_request.project.add_developer(user)
+      end
+
+      it 'returns the merge request as discussion locked' do
+        expect(mutated_merge_request).to eq(merge_request)
+        expect(mutated_merge_request).to be_discussion_locked
+        expect(subject[:errors]).to be_empty
+      end
+
+      it 'returns errors merge request could not be updated' do
+        # Make the merge request invalid
+        merge_request.allow_broken = true
+        merge_request.update!(source_project: nil)
+
+        expect(subject[:errors]).not_to be_empty
+      end
+
+      context 'when passing locked as false' do
+        let(:locked) { false }
+
+        it 'unlocks the discussion' do
+          merge_request.update(discussion_locked: true)
+
+          expect(mutated_merge_request).not_to be_discussion_locked
+        end
+      end
+    end
+  end
+end

spec/graphql/mutations/merge_requests/set_subscription_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Mutations::MergeRequests::SetSubscription do
+  let(:merge_request) { create(:merge_request) }
+  let(:project) { merge_request.project }
+  let(:user) { create(:user) }
+  subject(:mutation) { described_class.new(object: nil, context: { current_user: user }) }
+
+  describe '#resolve' do
+    let(:subscribe) { true }
+    let(:mutated_merge_request) { subject[:merge_request] }
+    subject { mutation.resolve(project_path: merge_request.project.full_path, iid: merge_request.iid, subscribed_state: subscribe) }
+
+    it 'raises an error if the resource is not accessible to the user' do
+      expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+    end
+
+    context 'when the user can update the merge request' do
+      before do
+        merge_request.project.add_developer(user)
+      end
+
+      it 'returns the merge request as discussion locked' do
+        expect(mutated_merge_request).to eq(merge_request)
+        expect(mutated_merge_request.subscribed?(user, project)).to eq(true)
+        expect(subject[:errors]).to be_empty
+      end
+
+      context 'when passing subscribe as false' do
+        let(:subscribe) { false }
+
+        it 'unsubscribes from the discussion' do
+          merge_request.subscribe(user, project)
+
+          expect(mutated_merge_request.subscribed?(user, project)).to eq(false)
+        end
+      end
+    end
+  end
+end

spec/graphql/types/label_type_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 
 describe GitlabSchema.types['Label'] do
   it 'has the correct fields' do
-    expected_fields = [:description, :description_html, :title, :color, :text_color]
+    expected_fields = [:id, :description, :description_html, :title, :color, :text_color]
 
     is_expected.to have_graphql_fields(*expected_fields)
   end

spec/requests/api/graphql/mutations/merge_requests/set_labels_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Setting labels of a merge request' do
+  include GraphqlHelpers
+
+  let(:current_user) { create(:user) }
+  let(:merge_request) { create(:merge_request) }
+  let(:project) { merge_request.project }
+  let(:label) { create(:label, project: project) }
+  let(:label2) { create(:label, project: project) }
+  let(:input) { { label_ids: [GitlabSchema.id_from_object(label).to_s] } }
+
+  let(:mutation) do
+    variables = {
+      project_path: project.full_path,
+      iid: merge_request.iid.to_s
+    }
+    graphql_mutation(:merge_request_set_labels, variables.merge(input),
+                     <<-QL.strip_heredoc
+                       clientMutationId
+                       errors
+                       mergeRequest {
+                         id
+                         labels {
+                           nodes {
+                             id
+                           }
+                         }
+                       }
+    QL
+    )
+  end
+
+  def mutation_response
+    graphql_mutation_response(:merge_request_set_labels)
+  end
+
+  def mutation_label_nodes
+    mutation_response['mergeRequest']['labels']['nodes']
+  end
+
+  before do
+    project.add_developer(current_user)
+  end
+
+  it 'returns an error if the user is not allowed to update the merge request' do
+    post_graphql_mutation(mutation, current_user: create(:user))
+
+    expect(graphql_errors).not_to be_empty
+  end
+
+  it 'sets the merge request labels, removing existing ones' do
+    merge_request.update(labels: [label2])
+
+    post_graphql_mutation(mutation, current_user: current_user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_label_nodes.count).to eq(1)
+    expect(mutation_label_nodes[0]['id']).to eq(label.to_global_id.to_s)
+  end
+
+  context 'when passing label_ids empty array as input' do
+    let(:input) { { label_ids: [] } }
+
+    it 'removes the merge request labels' do
+      merge_request.update!(labels: [label])
+
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_label_nodes.count).to eq(0)
+    end
+  end
+
+  context 'when passing operation_mode as APPEND' do
+    let(:input) { { operation_mode: Types::MutationOperationModeEnum.enum[:append], label_ids: [GitlabSchema.id_from_object(label).to_s] } }
+
+    before do
+      merge_request.update!(labels: [label2])
+    end
+
+    it 'sets the labels, without removing others' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_label_nodes.count).to eq(2)
+      expect(mutation_label_nodes).to contain_exactly({ 'id' => label.to_global_id.to_s }, { 'id' => label2.to_global_id.to_s })
+    end
+  end
+
+  context 'when passing operation_mode as REMOVE' do
+    let(:input) { { operation_mode: Types::MutationOperationModeEnum.enum[:remove], label_ids: [GitlabSchema.id_from_object(label).to_s] } }
+
+    before do
+      merge_request.update!(labels: [label, label2])
+    end
+
+    it 'removes the labels, without removing others' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_label_nodes.count).to eq(1)
+      expect(mutation_label_nodes[0]['id']).to eq(label2.to_global_id.to_s)
+    end
+  end
+end

spec/requests/api/graphql/mutations/merge_requests/set_locked_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Setting locked status of a merge request' do
+  include GraphqlHelpers
+
+  let(:current_user) { create(:user) }
+  let(:merge_request) { create(:merge_request) }
+  let(:project) { merge_request.project }
+  let(:input) { { locked: true } }
+
+  let(:mutation) do
+    variables = {
+      project_path: project.full_path,
+      iid: merge_request.iid.to_s
+    }
+    graphql_mutation(:merge_request_set_locked, variables.merge(input),
+                     <<-QL.strip_heredoc
+                       clientMutationId
+                       errors
+                       mergeRequest {
+                         id
+                         discussionLocked
+                       }
+    QL
+    )
+  end
+
+  def mutation_response
+    graphql_mutation_response(:merge_request_set_locked)['mergeRequest']['discussionLocked']
+  end
+
+  before do
+    project.add_developer(current_user)
+  end
+
+  it 'returns an error if the user is not allowed to update the merge request' do
+    post_graphql_mutation(mutation, current_user: create(:user))
+
+    expect(graphql_errors).not_to be_empty
+  end
+
+  it 'marks the merge request as WIP' do
+    post_graphql_mutation(mutation, current_user: current_user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_response).to eq(true)
+  end
+
+  it 'does not do anything if the merge request was already locked' do
+    merge_request.update!(discussion_locked: true)
+
+    post_graphql_mutation(mutation, current_user: current_user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_response).to eq(true)
+  end
+
+  context 'when passing locked false as input' do
+    let(:input) { { locked: false } }
+
+    it 'does not do anything if the merge request was not marked locked' do
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response).to eq(false)
+    end
+
+    it 'unmarks the merge request as locked' do
+      merge_request.update!(discussion_locked: true)
+
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response).to eq(false)
+    end
+  end
+end

spec/requests/api/graphql/mutations/merge_requests/set_subscription_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Setting subscribed status of a merge request' do
+  include GraphqlHelpers
+
+  let(:current_user) { create(:user) }
+  let(:merge_request) { create(:merge_request) }
+  let(:project) { merge_request.project }
+  let(:input) { { subscribed_state: true } }
+
+  let(:mutation) do
+    variables = {
+      project_path: project.full_path,
+      iid: merge_request.iid.to_s
+    }
+    graphql_mutation(:merge_request_set_subscription, variables.merge(input),
+                     <<-QL.strip_heredoc
+                       clientMutationId
+                       errors
+                       mergeRequest {
+                         id
+                         subscribed
+                       }
+    QL
+    )
+  end
+
+  def mutation_response
+    graphql_mutation_response(:merge_request_set_subscription)['mergeRequest']['subscribed']
+  end
+
+  before do
+    project.add_developer(current_user)
+  end
+
+  it 'returns an error if the user is not allowed to update the merge request' do
+    post_graphql_mutation(mutation, current_user: create(:user))
+
+    expect(graphql_errors).not_to be_empty
+  end
+
+  it 'marks the merge request as WIP' do
+    post_graphql_mutation(mutation, current_user: current_user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_response).to eq(true)
+  end
+
+  context 'when passing subscribe false as input' do
+    let(:input) { { subscribed_state: false } }
+
+    it 'unmarks the merge request as subscribed' do
+      merge_request.subscribe(current_user, project)
+
+      post_graphql_mutation(mutation, current_user: current_user)
+
+      expect(response).to have_gitlab_http_status(:success)
+      expect(mutation_response).to eq(false)
+    end
+  end
+end