diff --git a/app/models/group.rb b/app/models/group.rb
index 71f58a5fd1ab67c8158a9e7c06bdac638b1ac285..c38ddbdf6fbcb3f8aa13beab50b47f0a78f07f97 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -18,6 +18,8 @@ class Group < Namespace
 
   ACCESS_REQUEST_APPROVERS_TO_BE_NOTIFIED_LIMIT = 10
 
+  UpdateSharedRunnersError = Class.new(StandardError)
+
   has_many :group_members, -> { where(requested_at: nil) }, dependent: :destroy, as: :source # rubocop:disable Cop/ActiveRecordDependent
   alias_method :members, :group_members
   has_many :users, through: :group_members
@@ -89,6 +91,8 @@ class Group < Namespace
 
   scope :with_users, -> { includes(:users) }
 
+  scope :by_id, ->(groups) { where(id: groups) }
+
   class << self
     def sort_by_attribute(method)
       if method == 'storage_size_desc'
@@ -504,6 +508,55 @@ def preload_shared_group_links
     preloader.preload(self, shared_with_group_links: [shared_with_group: :route])
   end
 
+  def shared_runners_allowed?
+    shared_runners_enabled? || allow_descendants_override_disabled_shared_runners?
+  end
+
+  def parent_allows_shared_runners?
+    return true unless has_parent?
+
+    parent.shared_runners_allowed?
+  end
+
+  def parent_enabled_shared_runners?
+    return true unless has_parent?
+
+    parent.shared_runners_enabled?
+  end
+
+  def enable_shared_runners!
+    raise UpdateSharedRunnersError, 'Shared Runners disabled for the parent group' unless parent_enabled_shared_runners?
+
+    update_column(:shared_runners_enabled, true)
+  end
+
+  def disable_shared_runners!
+    group_ids = self_and_descendants
+    return if group_ids.empty?
+
+    Group.by_id(group_ids).update_all(shared_runners_enabled: false)
+
+    all_projects.update_all(shared_runners_enabled: false)
+  end
+
+  def allow_descendants_override_disabled_shared_runners!
+    raise UpdateSharedRunnersError, 'Shared Runners enabled' if shared_runners_enabled?
+    raise UpdateSharedRunnersError, 'Group level shared Runners not allowed' unless parent_allows_shared_runners?
+
+    update_column(:allow_descendants_override_disabled_shared_runners, true)
+  end
+
+  def disallow_descendants_override_disabled_shared_runners!
+    raise UpdateSharedRunnersError, 'Shared Runners enabled' if shared_runners_enabled?
+
+    group_ids = self_and_descendants
+    return if group_ids.empty?
+
+    Group.by_id(group_ids).update_all(allow_descendants_override_disabled_shared_runners: false)
+
+    all_projects.update_all(shared_runners_enabled: false)
+  end
+
   private
 
   def update_two_factor_requirement
diff --git a/app/models/namespace.rb b/app/models/namespace.rb
index 6176e8db9207b5076acf4e1cef167d5edc2334b8..bc23b7d6af0354bdded317faa5e42c5c402e3e01 100644
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -211,7 +211,7 @@ def lfs_enabled?
     Gitlab.config.lfs.enabled
   end
 
-  def shared_runners_enabled?
+  def any_project_with_shared_runners_enabled?
     projects.with_shared_runners.any?
   end
 
diff --git a/app/services/groups/update_shared_runners_service.rb b/app/services/groups/update_shared_runners_service.rb
new file mode 100644
index 0000000000000000000000000000000000000000..63f5710451034413eaa70559455d1d73bd1d806b
--- /dev/null
+++ b/app/services/groups/update_shared_runners_service.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+module Groups
+  class UpdateSharedRunnersService < Groups::BaseService
+    def execute
+      return error('Operation not allowed', 403) unless can?(current_user, :admin_group, group)
+
+      validate_params
+
+      enable_or_disable_shared_runners!
+      allow_or_disallow_descendants_override_disabled_shared_runners!
+
+      success
+
+    rescue Group::UpdateSharedRunnersError => error
+      error(error.message)
+    end
+
+    private
+
+    def validate_params
+      if Gitlab::Utils.to_boolean(params[:shared_runners_enabled]) && !params[:allow_descendants_override_disabled_shared_runners].nil?
+        raise Group::UpdateSharedRunnersError, 'Cannot set shared_runners_enabled to true and allow_descendants_override_disabled_shared_runners'
+      end
+    end
+
+    def enable_or_disable_shared_runners!
+      return if params[:shared_runners_enabled].nil?
+
+      if Gitlab::Utils.to_boolean(params[:shared_runners_enabled])
+        group.enable_shared_runners!
+      else
+        group.disable_shared_runners!
+      end
+    end
+
+    def allow_or_disallow_descendants_override_disabled_shared_runners!
+      return if params[:allow_descendants_override_disabled_shared_runners].nil?
+
+      # Needs to reset group because if both params are present could result in error
+      group.reset
+
+      if Gitlab::Utils.to_boolean(params[:allow_descendants_override_disabled_shared_runners])
+        group.allow_descendants_override_disabled_shared_runners!
+      else
+        group.disallow_descendants_override_disabled_shared_runners!
+      end
+    end
+  end
+end
diff --git a/changelogs/unreleased/add-Groups-SharedRunnersService-tests-migrations.yml b/changelogs/unreleased/add-Groups-SharedRunnersService-tests-migrations.yml
new file mode 100644
index 0000000000000000000000000000000000000000..308225344b5cc61094ca9b6f64e2fb1d6fe24517
--- /dev/null
+++ b/changelogs/unreleased/add-Groups-SharedRunnersService-tests-migrations.yml
@@ -0,0 +1,5 @@
+---
+title: Add setting to enable and disable shared Runners for a group and its descendants
+merge_request: 33411
+author: Arthur de Lapertosa Lisboa
+type: added
diff --git a/db/migrate/20200424102023_add_shared_runners_enabled_and_override_to_namespaces.rb b/db/migrate/20200424102023_add_shared_runners_enabled_and_override_to_namespaces.rb
new file mode 100644
index 0000000000000000000000000000000000000000..2555a50be44fe1d56a0e8cf3c830f4c4ca6a94dd
--- /dev/null
+++ b/db/migrate/20200424102023_add_shared_runners_enabled_and_override_to_namespaces.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class AddSharedRunnersEnabledAndOverrideToNamespaces < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    with_lock_retries do
+      add_column :namespaces, :shared_runners_enabled, :boolean, default: true, null: false
+      add_column :namespaces, :allow_descendants_override_disabled_shared_runners, :boolean, default: false, null: false
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_column :namespaces, :shared_runners_enabled, :boolean
+      remove_column :namespaces, :allow_descendants_override_disabled_shared_runners, :boolean
+    end
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index 93fcdaa4a1cef543e99c0582906c81ef0690197d..eb628da59f1f1dfd830ec09b3653f1031f695b10 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -13086,7 +13086,9 @@ CREATE TABLE public.namespaces (
     default_branch_protection smallint,
     unlock_membership_to_ldap boolean,
     max_personal_access_token_lifetime integer,
-    push_rule_id bigint
+    push_rule_id bigint,
+    shared_runners_enabled boolean DEFAULT true NOT NULL,
+    allow_descendants_override_disabled_shared_runners boolean DEFAULT false NOT NULL
 );
 
 CREATE SEQUENCE public.namespaces_id_seq
@@ -23366,6 +23368,7 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200424043515
 20200424050250
 20200424101920
+20200424102023
 20200424135319
 20200427064130
 20200428134356
diff --git a/ee/app/models/ee/namespace.rb b/ee/app/models/ee/namespace.rb
index e86eaa8a6a9fbacf01708b21c82f7ffb0c1ca9ec..edc28858efe6189d363e7f30a35b27eba9c0072d 100644
--- a/ee/app/models/ee/namespace.rb
+++ b/ee/app/models/ee/namespace.rb
@@ -212,7 +212,7 @@ def actual_shared_runners_minutes_limit(include_extra: true)
 
     def shared_runners_minutes_limit_enabled?
       shared_runner_minutes_supported? &&
-        shared_runners_enabled? &&
+        any_project_with_shared_runners_enabled? &&
         actual_shared_runners_minutes_limit.nonzero?
     end
 
@@ -238,7 +238,7 @@ def extra_shared_runners_minutes_used?
         extra_shared_runners_minutes.to_i >= extra_shared_runners_minutes_limit
     end
 
-    def shared_runners_enabled?
+    def any_project_with_shared_runners_enabled?
       all_projects.with_shared_runners.any?
     end
 
diff --git a/ee/app/views/namespaces/_shared_runner_status.html.haml b/ee/app/views/namespaces/_shared_runner_status.html.haml
index ab039197bdb69179cb83bd66551be975459e6d24..125356e465c43edd941e9d5946f415e0124ba4f2 100644
--- a/ee/app/views/namespaces/_shared_runner_status.html.haml
+++ b/ee/app/views/namespaces/_shared_runner_status.html.haml
@@ -1,7 +1,7 @@
 - namespace = local_assigns.fetch(:namespace)
 - minutes_quota = namespace.ci_minutes_quota
 
-- if namespace.shared_runners_enabled?
+- if namespace.any_project_with_shared_runners_enabled?
   %li
     %span.light Pipeline minutes quota:
     %strong
diff --git a/ee/app/views/namespaces/pipelines_quota/_list.haml b/ee/app/views/namespaces/pipelines_quota/_list.haml
index 64592bd514c44986846c077426b7f6d536859a46..20f1643c462476af0dfcdbb43452d5dbbb1a51ba 100644
--- a/ee/app/views/namespaces/pipelines_quota/_list.haml
+++ b/ee/app/views/namespaces/pipelines_quota/_list.haml
@@ -29,7 +29,7 @@
     .col-sm-6.right
       - if namespace.shared_runners_minutes_limit_enabled?
         #{minutes_quota.monthly_percent_used}% used
-      - elsif !namespace.shared_runners_enabled?
+      - elsif !namespace.any_project_with_shared_runners_enabled?
         0% used
       - else
         = s_('UsageQuota|Unlimited')
@@ -47,7 +47,7 @@
         = _('Minutes')
 
   %tbody
-    - if !namespace.shared_runners_enabled?
+    - if !namespace.any_project_with_shared_runners_enabled?
       %tr
         %td{ colspan: 2 }
           .nothing-here-block
diff --git a/ee/spec/models/ee/namespace_spec.rb b/ee/spec/models/ee/namespace_spec.rb
index 6819a6d4632e9ba17f9b12f8c5d36385612d50b1..7ffa5d29f4efcd17cfc8ed2d60aea56a6a21dc7c 100644
--- a/ee/spec/models/ee/namespace_spec.rb
+++ b/ee/spec/models/ee/namespace_spec.rb
@@ -429,8 +429,8 @@
     end
   end
 
-  describe '#shared_runners_enabled?' do
-    subject { namespace.shared_runners_enabled? }
+  describe '#any_project_with_shared_runners_enabled?' do
+    subject { namespace.any_project_with_shared_runners_enabled? }
 
     context 'without projects' do
       it { is_expected.to be_falsey }
@@ -557,8 +557,8 @@
     end
   end
 
-  describe '#shared_runners_enabled?' do
-    subject { namespace.shared_runners_enabled? }
+  describe '#any_project_with_shared_runners_enabled?' do
+    subject { namespace.any_project_with_shared_runners_enabled? }
 
     context 'subgroup with shared runners enabled project' do
       let(:subgroup) { create(:group, parent: namespace) }
diff --git a/spec/factories/groups.rb b/spec/factories/groups.rb
index d51c437f83ae8b3edbea873f275948047947b971..60d427dde008796c66d62c1d8e9fa45342c9e3d7 100644
--- a/spec/factories/groups.rb
+++ b/spec/factories/groups.rb
@@ -51,5 +51,13 @@
     trait :owner_subgroup_creation_only do
       subgroup_creation_level { ::Gitlab::Access::OWNER_SUBGROUP_ACCESS }
     end
+
+    trait :shared_runners_disabled do
+      shared_runners_enabled { false }
+    end
+
+    trait :allow_descendants_override_disabled_shared_runners do
+      allow_descendants_override_disabled_shared_runners { true }
+    end
   end
 end
diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
index da1bf026f6078ce62c2e1b8a6cc73ecf7c290191..4184f2d07cc6ff0a29d2b9f81221faa6a4fee714 100644
--- a/spec/models/group_spec.rb
+++ b/spec/models/group_spec.rb
@@ -1313,4 +1313,231 @@ def setup_group_members(group)
       expect(groups).to contain_exactly(parent_group1, parent_group2, child_group1, child_group2, child_group3)
     end
   end
+
+  describe '#shared_runners_allowed?' do
+    using RSpec::Parameterized::TableSyntax
+
+    where(:shared_runners_enabled, :allow_descendants_override, :expected_shared_runners_allowed) do
+      true  | false | true
+      true  | true  | true
+      false | false | false
+      false | true  | true
+    end
+
+    with_them do
+      let!(:group) { create(:group, shared_runners_enabled: shared_runners_enabled, allow_descendants_override_disabled_shared_runners: allow_descendants_override) }
+
+      it 'returns the expected result' do
+        expect(group.shared_runners_allowed?).to eq(expected_shared_runners_allowed)
+      end
+    end
+  end
+
+  describe '#parent_allows_shared_runners?' do
+    context 'when parent group is present' do
+      using RSpec::Parameterized::TableSyntax
+
+      where(:shared_runners_enabled, :allow_descendants_override, :expected_shared_runners_allowed) do
+        true  | false | true
+        true  | true  | true
+        false | false | false
+        false | true  | true
+      end
+
+      with_them do
+        let!(:parent_group) { create(:group, shared_runners_enabled: shared_runners_enabled, allow_descendants_override_disabled_shared_runners: allow_descendants_override) }
+        let!(:group) { create(:group, parent: parent_group) }
+
+        it 'returns the expected result' do
+          expect(group.parent_allows_shared_runners?).to eq(expected_shared_runners_allowed)
+        end
+      end
+    end
+
+    context 'when parent group is missing' do
+      let!(:group) { create(:group) }
+
+      it 'returns true' do
+        expect(group.parent_allows_shared_runners?).to be_truthy
+      end
+    end
+  end
+
+  describe '#parent_enabled_shared_runners?' do
+    subject { group.parent_enabled_shared_runners? }
+
+    context 'when parent group is present' do
+      context 'When shared Runners are disabled' do
+        let!(:parent_group) { create(:group, :shared_runners_disabled) }
+        let!(:group) { create(:group, parent: parent_group) }
+
+        it { is_expected.to be_falsy }
+      end
+
+      context 'When shared Runners are enabled' do
+        let!(:parent_group) { create(:group) }
+        let!(:group) { create(:group, parent: parent_group) }
+
+        it { is_expected.to be_truthy }
+      end
+    end
+
+    context 'when parent group is missing' do
+      let!(:group) { create(:group) }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
+  describe '#enable_shared_runners!' do
+    subject { group.enable_shared_runners! }
+
+    context 'group that its ancestors have shared runners disabled' do
+      let_it_be(:parent) { create(:group, :shared_runners_disabled) }
+      let_it_be(:group) { create(:group, :shared_runners_disabled, parent: parent) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: group) }
+
+      it 'raises error and does not enable shared Runners' do
+        expect { subject }
+          .to raise_error(described_class::UpdateSharedRunnersError, 'Shared Runners disabled for the parent group')
+          .and not_change { parent.reload.shared_runners_enabled }
+          .and not_change { group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+
+    context 'root group with shared runners disabled' do
+      let_it_be(:group) { create(:group, :shared_runners_disabled) }
+      let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: sub_group) }
+
+      it 'enables shared Runners only for itself' do
+        expect { subject }
+          .to change { group.reload.shared_runners_enabled }.from(false).to(true)
+          .and not_change { sub_group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+  end
+
+  describe '#disable_shared_runners!' do
+    let_it_be(:group) { create(:group) }
+    let_it_be(:sub_group) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners, parent: group) }
+    let_it_be(:sub_group_2) { create(:group, parent: group) }
+    let_it_be(:project) { create(:project, group: group, shared_runners_enabled: true) }
+    let_it_be(:project_2) { create(:project, group: sub_group_2, shared_runners_enabled: true) }
+
+    subject { group.disable_shared_runners! }
+
+    it 'disables shared Runners for all descendant groups and projects' do
+      expect { subject }
+        .to change { group.reload.shared_runners_enabled }.from(true).to(false)
+        .and not_change { group.reload.allow_descendants_override_disabled_shared_runners }
+        .and not_change { sub_group.reload.shared_runners_enabled }
+        .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+        .and change { sub_group_2.reload.shared_runners_enabled }.from(true).to(false)
+        .and not_change { sub_group_2.reload.allow_descendants_override_disabled_shared_runners }
+        .and change { project.reload.shared_runners_enabled }.from(true).to(false)
+        .and change { project_2.reload.shared_runners_enabled }.from(true).to(false)
+    end
+  end
+
+  describe '#allow_descendants_override_disabled_shared_runners!' do
+    subject { group.allow_descendants_override_disabled_shared_runners! }
+
+    context 'top level group' do
+      let_it_be(:group) { create(:group, :shared_runners_disabled) }
+      let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: sub_group) }
+
+      it 'enables allow descendants to override only for itself' do
+        expect { subject }
+          .to change { group.reload.allow_descendants_override_disabled_shared_runners }.from(false).to(true)
+          .and not_change { group.reload.shared_runners_enabled }
+          .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { sub_group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+
+    context 'group that its ancestors have shared Runners disabled but allows to override' do
+      let_it_be(:parent) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners) }
+      let_it_be(:group) { create(:group, :shared_runners_disabled, parent: parent) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: group) }
+
+      it 'enables allow descendants to override' do
+        expect { subject }
+          .to not_change { parent.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { parent.reload.shared_runners_enabled }
+          .and change { group.reload.allow_descendants_override_disabled_shared_runners }.from(false).to(true)
+          .and not_change { group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+
+    context 'when parent does not allow' do
+      let_it_be(:parent) { create(:group, :shared_runners_disabled, allow_descendants_override_disabled_shared_runners: false ) }
+      let_it_be(:group) { create(:group, :shared_runners_disabled, allow_descendants_override_disabled_shared_runners: false, parent: parent) }
+
+      it 'raises error and does not allow descendants to override' do
+        expect { subject }
+          .to raise_error(described_class::UpdateSharedRunnersError, 'Group level shared Runners not allowed')
+          .and not_change { parent.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { parent.reload.shared_runners_enabled }
+          .and not_change { group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { group.reload.shared_runners_enabled }
+      end
+    end
+
+    context 'top level group that has shared Runners enabled' do
+      let_it_be(:group) { create(:group, shared_runners_enabled: true) }
+      let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: sub_group) }
+
+      it 'raises error and does not change config' do
+        expect { subject }
+          .to raise_error(described_class::UpdateSharedRunnersError, 'Shared Runners enabled')
+          .and not_change { group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { group.reload.shared_runners_enabled }
+          .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { sub_group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+  end
+
+  describe '#disallow_descendants_override_disabled_shared_runners!' do
+    subject { group.disallow_descendants_override_disabled_shared_runners! }
+
+    context 'top level group' do
+      let_it_be(:group) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners ) }
+      let_it_be(:sub_group) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners, parent: group) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: true, group: sub_group) }
+
+      it 'disables allow project to override for descendants and disables project shared Runners' do
+        expect { subject }
+          .to not_change { group.reload.shared_runners_enabled }
+          .and change { group.reload.allow_descendants_override_disabled_shared_runners }.from(true).to(false)
+          .and not_change { sub_group.reload.shared_runners_enabled }
+          .and change { sub_group.reload.allow_descendants_override_disabled_shared_runners }.from(true).to(false)
+          .and change { project.reload.shared_runners_enabled }.from(true).to(false)
+      end
+    end
+
+    context 'top level group that has shared Runners enabled' do
+      let_it_be(:group) { create(:group, shared_runners_enabled: true) }
+      let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+      let_it_be(:project) { create(:project, shared_runners_enabled: false, group: sub_group) }
+
+      it 'results error and does not change config' do
+        expect { subject }
+          .to raise_error(described_class::UpdateSharedRunnersError, 'Shared Runners enabled')
+          .and not_change { group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { group.reload.shared_runners_enabled }
+          .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+          .and not_change { sub_group.reload.shared_runners_enabled }
+          .and not_change { project.reload.shared_runners_enabled }
+      end
+    end
+  end
 end
diff --git a/spec/services/groups/update_shared_runners_service_spec.rb b/spec/services/groups/update_shared_runners_service_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..9fd8477a455d72f8c3d2179587c80037b5655323
--- /dev/null
+++ b/spec/services/groups/update_shared_runners_service_spec.rb
@@ -0,0 +1,230 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::UpdateSharedRunnersService do
+  let(:user) { create(:user) }
+  let(:group) { create(:group) }
+  let(:params) { {} }
+
+  describe '#execute' do
+    subject { described_class.new(group, user, params).execute }
+
+    context 'when current_user is not the group owner' do
+      let_it_be(:group) { create(:group) }
+
+      let(:params) { { shared_runners_enabled: '0' } }
+
+      before do
+        group.add_maintainer(user)
+      end
+
+      it 'results error and does not call any method' do
+        expect(group).not_to receive(:enable_shared_runners!)
+        expect(group).not_to receive(:disable_shared_runners!)
+        expect(group).not_to receive(:allow_descendants_override_disabled_shared_runners!)
+        expect(group).not_to receive(:disallow_descendants_override_disabled_shared_runners!)
+
+        expect(subject[:status]).to eq(:error)
+        expect(subject[:message]).to eq('Operation not allowed')
+        expect(subject[:http_status]).to eq(403)
+      end
+    end
+
+    context 'when current_user is the group owner' do
+      before do
+        group.add_owner(user)
+      end
+
+      context 'enable shared Runners' do
+        where(:desired_params) do
+          ['1', true]
+        end
+
+        with_them do
+          let(:params) { { shared_runners_enabled: desired_params } }
+
+          context 'group that its ancestors have shared runners disabled' do
+            let_it_be(:parent) { create(:group, :shared_runners_disabled) }
+            let_it_be(:group) { create(:group, :shared_runners_disabled, parent: parent) }
+
+            it 'results error' do
+              expect(subject[:status]).to eq(:error)
+              expect(subject[:message]).to eq('Shared Runners disabled for the parent group')
+            end
+          end
+
+          context 'root group with shared runners disabled' do
+            let_it_be(:group) { create(:group, :shared_runners_disabled) }
+
+            it 'receives correct method and succeeds' do
+              expect(group).to receive(:enable_shared_runners!)
+              expect(group).not_to receive(:disable_shared_runners!)
+              expect(group).not_to receive(:allow_descendants_override_disabled_shared_runners!)
+              expect(group).not_to receive(:disallow_descendants_override_disabled_shared_runners!)
+
+              expect(subject[:status]).to eq(:success)
+            end
+          end
+        end
+      end
+
+      context 'disable shared Runners' do
+        let_it_be(:group) { create(:group) }
+
+        where(:desired_params) do
+          ['0', false]
+        end
+
+        with_them do
+          let(:params) { { shared_runners_enabled: desired_params } }
+
+          it 'receives correct method and succeeds' do
+            expect(group).to receive(:disable_shared_runners!)
+            expect(group).not_to receive(:enable_shared_runners!)
+            expect(group).not_to receive(:allow_descendants_override_disabled_shared_runners!)
+            expect(group).not_to receive(:disallow_descendants_override_disabled_shared_runners!)
+
+            expect(subject[:status]).to eq(:success)
+          end
+        end
+      end
+
+      context 'allow descendants to override' do
+        where(:desired_params) do
+          ['1', true]
+        end
+
+        with_them do
+          let(:params) { { allow_descendants_override_disabled_shared_runners: desired_params } }
+
+          context 'top level group' do
+            let_it_be(:group) { create(:group, :shared_runners_disabled) }
+
+            it 'receives correct method and succeeds' do
+              expect(group).to receive(:allow_descendants_override_disabled_shared_runners!)
+              expect(group).not_to receive(:disallow_descendants_override_disabled_shared_runners!)
+              expect(group).not_to receive(:enable_shared_runners!)
+              expect(group).not_to receive(:disable_shared_runners!)
+
+              expect(subject[:status]).to eq(:success)
+            end
+          end
+
+          context 'when parent does not allow' do
+            let_it_be(:parent) { create(:group, :shared_runners_disabled, allow_descendants_override_disabled_shared_runners: false ) }
+            let_it_be(:group) { create(:group, :shared_runners_disabled, allow_descendants_override_disabled_shared_runners: false, parent: parent) }
+
+            it 'results error' do
+              expect(subject[:status]).to eq(:error)
+              expect(subject[:message]).to eq('Group level shared Runners not allowed')
+            end
+          end
+        end
+      end
+
+      context 'disallow descendants to override' do
+        where(:desired_params) do
+          ['0', false]
+        end
+
+        with_them do
+          let(:params) { { allow_descendants_override_disabled_shared_runners: desired_params } }
+
+          context 'top level group' do
+            let_it_be(:group) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners ) }
+
+            it 'receives correct method and succeeds' do
+              expect(group).to receive(:disallow_descendants_override_disabled_shared_runners!)
+              expect(group).not_to receive(:allow_descendants_override_disabled_shared_runners!)
+              expect(group).not_to receive(:enable_shared_runners!)
+              expect(group).not_to receive(:disable_shared_runners!)
+
+              expect(subject[:status]).to eq(:success)
+            end
+          end
+
+          context 'top level group that has shared Runners enabled' do
+            let_it_be(:group) { create(:group, shared_runners_enabled: true) }
+
+            it 'results error' do
+              expect(subject[:status]).to eq(:error)
+              expect(subject[:message]).to eq('Shared Runners enabled')
+            end
+          end
+        end
+      end
+
+      context 'both params are present' do
+        context 'shared_runners_enabled: 1 and allow_descendants_override_disabled_shared_runners' do
+          let_it_be(:group) { create(:group, :shared_runners_disabled) }
+          let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+          let_it_be(:project) { create(:project, shared_runners_enabled: false, group: sub_group) }
+
+          where(:allow_descendants_override) do
+            ['1', true, '0', false]
+          end
+
+          with_them do
+            let(:params) { { shared_runners_enabled: '1', allow_descendants_override_disabled_shared_runners: allow_descendants_override } }
+
+            it 'results in an error because shared Runners are enabled' do
+              expect { subject }
+                .to not_change { group.reload.shared_runners_enabled }
+                .and not_change { sub_group.reload.shared_runners_enabled }
+                .and not_change { project.reload.shared_runners_enabled }
+                .and not_change { group.reload.allow_descendants_override_disabled_shared_runners }
+                .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+              expect(subject[:status]).to eq(:error)
+              expect(subject[:message]).to eq('Cannot set shared_runners_enabled to true and allow_descendants_override_disabled_shared_runners')
+            end
+          end
+        end
+
+        context 'shared_runners_enabled: 0 and allow_descendants_override_disabled_shared_runners: 0' do
+          let_it_be(:group) { create(:group, :allow_descendants_override_disabled_shared_runners) }
+          let_it_be(:sub_group) { create(:group, :shared_runners_disabled, :allow_descendants_override_disabled_shared_runners, parent: group) }
+          let_it_be(:sub_group_2) { create(:group, parent: group) }
+          let_it_be(:project) { create(:project, group: group, shared_runners_enabled: true) }
+          let_it_be(:project_2) { create(:project, group: sub_group_2, shared_runners_enabled: true) }
+
+          let(:params) { { shared_runners_enabled: '0', allow_descendants_override_disabled_shared_runners: '0' } }
+
+          it 'disables shared Runners and disable allow_descendants_override_disabled_shared_runners' do
+            expect { subject }
+              .to change { group.reload.shared_runners_enabled }.from(true).to(false)
+              .and change { group.reload.allow_descendants_override_disabled_shared_runners }.from(true).to(false)
+              .and not_change { sub_group.reload.shared_runners_enabled }
+              .and change { sub_group.reload.allow_descendants_override_disabled_shared_runners }.from(true).to(false)
+              .and change { sub_group_2.reload.shared_runners_enabled }.from(true).to(false)
+              .and not_change { sub_group_2.reload.allow_descendants_override_disabled_shared_runners }
+              .and change { project.reload.shared_runners_enabled }.from(true).to(false)
+              .and change { project_2.reload.shared_runners_enabled }.from(true).to(false)
+          end
+        end
+
+        context 'shared_runners_enabled: 0 and allow_descendants_override_disabled_shared_runners: 1' do
+          let_it_be(:group) { create(:group) }
+          let_it_be(:sub_group) { create(:group, :shared_runners_disabled, parent: group) }
+          let_it_be(:sub_group_2) { create(:group, parent: group) }
+          let_it_be(:project) { create(:project, group: group, shared_runners_enabled: true) }
+          let_it_be(:project_2) { create(:project, group: sub_group_2, shared_runners_enabled: true) }
+
+          let(:params) { { shared_runners_enabled: '0', allow_descendants_override_disabled_shared_runners: '1' } }
+
+          it 'disables shared Runners and enable allow_descendants_override_disabled_shared_runners only for itself' do
+            expect { subject }
+              .to change { group.reload.shared_runners_enabled }.from(true).to(false)
+              .and change { group.reload.allow_descendants_override_disabled_shared_runners }.from(false).to(true)
+              .and not_change { sub_group.reload.shared_runners_enabled }
+              .and not_change { sub_group.reload.allow_descendants_override_disabled_shared_runners }
+              .and change { sub_group_2.reload.shared_runners_enabled }.from(true).to(false)
+              .and not_change { sub_group_2.reload.allow_descendants_override_disabled_shared_runners }
+              .and change { project.reload.shared_runners_enabled }.from(true).to(false)
+              .and change { project_2.reload.shared_runners_enabled }.from(true).to(false)
+          end
+        end
+      end
+    end
+  end
+end