1 files changed, 142 insertions, 0 deletions
diff --git a/spec/factories/design_management/versions.rb b/spec/factories/design_management/versions.rb
new file mode 100644
index 00000000000..e6d17ba691c
--- /dev/null
+++ b/spec/factories/design_management/versions.rb
@@ -0,0 +1,142 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :design_version, class: 'DesignManagement::Version' do
+    sha
+    issue { designs.first&.issue || create(:issue) }
+    author { issue&.author || create(:user) }
+
+    transient do
+      designs_count { 1 }
+      created_designs { [] }
+      modified_designs { [] }
+      deleted_designs { [] }
+    end
+
+    # Warning: this will intentionally result in an invalid version!
+    trait :empty do
+      designs_count { 0 }
+    end
+
+    trait :importing do
+      issue { nil }
+
+      designs_count { 0 }
+      importing { true }
+      imported { false }
+    end
+
+    trait :imported do
+      importing { false }
+      imported { true }
+    end
+
+    after(:build) do |version, evaluator|
+      # By default all designs are created_designs, so just add them.
+      specific_designs = [].concat(
+        evaluator.created_designs,
+        evaluator.modified_designs,
+        evaluator.deleted_designs
+      )
+      version.designs += specific_designs
+
+      unless evaluator.designs_count.zero? || version.designs.present?
+        version.designs << create(:design, issue: version.issue)
+      end
+    end
+
+    after :create do |version, evaluator|
+      # FactoryBot does not like methods, so we use lambdas instead
+      events = DesignManagement::Action.events
+
+      version.actions
+        .where(design_id: evaluator.modified_designs.map(&:id))
+        .update_all(event: events[:modification])
+
+      version.actions
+        .where(design_id: evaluator.deleted_designs.map(&:id))
+        .update_all(event: events[:deletion])
+
+      version.designs.reload
+      # Ensure version.issue == design.issue for all version.designs
+      version.designs.update_all(issue_id: version.issue_id)
+
+      needed = evaluator.designs_count
+      have = version.designs.size
+
+      create_list(:design, [0, needed - have].max, issue: version.issue).each do |d|
+        version.designs << d
+      end
+
+      version.actions.reset
+    end
+
+    # Use this trait to build versions with designs that are backed by Git LFS, committed
+    # to the repository, and with an LfsObject correctly created for it.
+    trait :with_lfs_file do
+      committed
+
+      transient do
+        raw_file { fixture_file_upload('spec/fixtures/dk.png', 'image/png') }
+        lfs_pointer { Gitlab::Git::LfsPointerFile.new(SecureRandom.random_bytes) }
+        file { lfs_pointer.pointer }
+      end
+
+      after :create do |version, evaluator|
+        lfs_object = create(:lfs_object, file: evaluator.raw_file, oid: evaluator.lfs_pointer.sha256, size: evaluator.lfs_pointer.size)
+        create(:lfs_objects_project, project: version.project, lfs_object: lfs_object, repository_type: :design)
+      end
+    end
+
+    # This trait is for versions that must be present in the git repository.
+    trait :committed do
+      transient do
+        file { File.join(Rails.root, 'spec/fixtures/dk.png') }
+      end
+
+      after :create do |version, evaluator|
+        project = version.issue.project
+        repository = project.design_repository
+        repository.create_if_not_exists
+
+        designs = version.designs_by_event
+        base_change = { content: evaluator.file }
+
+        actions = %w[modification deletion].flat_map { |k| designs.fetch(k, []) }.map do |design|
+          base_change.merge(action: :create, file_path: design.full_path)
+        end
+
+        if actions.present?
+          repository.multi_action(
+            evaluator.author,
+            branch_name: 'master',
+            message: "created #{actions.size} files",
+            actions: actions
+          )
+        end
+
+        mapping = {
+          'creation' => :create,
+          'modification' => :update,
+          'deletion' => :delete
+        }
+
+        version_actions = designs.flat_map do |(event, designs)|
+          base = event == 'deletion' ? {} : base_change
+          designs.map do |design|
+            base.merge(action: mapping[event], file_path: design.full_path)
+          end
+        end
+
+        sha = repository.multi_action(
+          evaluator.author,
+          branch_name: 'master',
+          message: "edited #{version_actions.size} files",
+          actions: version_actions
+        )
+
+        version.update(sha: sha)
+      end
+    end
+  end
+end