Adds retryPipeline mutation

* First unrefactored spec

app/graphql/mutations/ci/base.rb

+# frozen_string_literal: true
+
+module Mutations
+  module Ci
+    class Base < BaseMutation
+
+      argument :id, GraphQL::ID_TYPE,
+                required: true,
+                description: 'The id of the pipeline to mutate'
+
+      field :pipeline,
+            Types::Ci::PipelineType,
+            null: true,
+            description: 'The pipeline after mutation'
+
+      authorize :update_pipeline
+
+      private
+
+      def find_object(id:)
+        ::Ci::Pipeline.find(id)
+      end
+    end
+  end
+end

app/graphql/mutations/ci/pipeline_retry.rb

+# frozen_string_literal: true
+
+module Mutations
+  module Ci
+    class PipelineRetry < Base
+      graphql_name 'PipelineRetry'
+
+      def resolve(id:)
+        pipeline = authorized_find!(id: id)
+        project = pipeline.project
+
+        ::Ci::RetryPipelineService.new(project, current_user).execute(pipeline)
+        {
+          pipeline: pipeline,
+          errors: errors_on_object(pipeline)
+        }
+      end
+
+    end
+  end
+end

app/graphql/types/mutation_type.rb

@@ -62,6 +62,7 @@ module Types
     mount_mutation Mutations::DesignManagement::Delete, calls_gitaly: true
     mount_mutation Mutations::DesignManagement::Move
     mount_mutation Mutations::ContainerExpirationPolicies::Update
+    mount_mutation Mutations::Ci::PipelineRetry
   end
 end
 

spec/requests/api/graphql/mutations/ci/cancel_pipeline_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'PipelineCancel' do
+  include GraphqlHelpers
+
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let(:pipeline) { create(:ci_pipeline,  project: project, user: user) }
+
+  let(:mutation) do
+    variables = {
+      id: pipeline.id
+    }
+    graphql_mutation(:pipeline_retry, variables,
+                     <<-QL
+                       errors
+                       pipeline {
+                         id
+                       }
+                     QL
+    )
+  end
+
+  let(:mutation_response) { graphql_mutation_response(:pipeline_cancel) }
+
+  before do
+    project.add_maintainer(user)
+  end
+
+  it 'returns an error if the user is not allowed to retry the pipeline' do
+    post_graphql_mutation(mutation, current_user: create(:user))
+
+    expect(graphql_errors).not_to be_empty
+  end
+
+  it 'retries a pipeline' do
+    post_graphql_mutation(mutation, current_user: user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_response['pipeline']['id']).to include(pipeline.id.to_s)
+  end
+end
+

spec/requests/api/graphql/mutations/ci/retry_pipeline_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'PipelineRetry' do
+  include GraphqlHelpers
+
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let(:pipeline) { create(:ci_pipeline,  project: project, user: user) }
+
+  let(:mutation) do
+    variables = {
+      id: pipeline.id
+    }
+    graphql_mutation(:pipeline_retry, variables,
+                     <<-QL
+                       errors
+                       pipeline {
+                         id
+                       }
+                     QL
+    )
+  end
+
+  let(:mutation_response) { graphql_mutation_response(:pipeline_retry) }
+
+  before do
+    project.add_maintainer(user)
+  end
+
+  it 'returns an error if the user is not allowed to retry the pipeline' do
+    post_graphql_mutation(mutation, current_user: create(:user))
+
+    expect(graphql_errors).not_to be_empty
+  end
+
+  it 'retries a pipeline' do
+    pipeline_id = ::Gitlab::GlobalId.build(pipeline, id: pipeline.id).to_s
+    post_graphql_mutation(mutation, current_user: user)
+
+    expect(response).to have_gitlab_http_status(:success)
+    expect(mutation_response['pipeline']['id']).to eq(pipeline_id)
+  end
+end