1 files changed, 113 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/link_lfs_objects_projects_spec.rb b/spec/lib/gitlab/background_migration/link_lfs_objects_projects_spec.rb
new file mode 100644
index 00000000000..5700cac2e0f
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+++ b/spec/lib/gitlab/background_migration/link_lfs_objects_projects_spec.rb
@@ -0,0 +1,113 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::BackgroundMigration::LinkLfsObjectsProjects, :migration, schema: 2020_03_10_075115 do
+  let(:namespaces) { table(:namespaces) }
+  let(:projects) { table(:projects) }
+  let(:fork_networks) { table(:fork_networks) }
+  let(:fork_network_members) { table(:fork_network_members) }
+  let(:lfs_objects) { table(:lfs_objects) }
+  let(:lfs_objects_projects) { table(:lfs_objects_projects) }
+
+  let(:namespace) { namespaces.create(name: 'GitLab', path: 'gitlab') }
+
+  let(:fork_network) { fork_networks.create(root_project_id: source_project.id) }
+  let(:another_fork_network) { fork_networks.create(root_project_id: another_source_project.id) }
+
+  let(:source_project) { projects.create(namespace_id: namespace.id) }
+  let(:another_source_project) { projects.create(namespace_id: namespace.id) }
+  let(:project) { projects.create(namespace_id: namespace.id) }
+  let(:another_project) { projects.create(namespace_id: namespace.id) }
+  let(:partially_linked_project) { projects.create(namespace_id: namespace.id) }
+  let(:fully_linked_project) { projects.create(namespace_id: namespace.id) }
+
+  let(:lfs_object) { lfs_objects.create(oid: 'abc123', size: 100) }
+  let(:another_lfs_object) { lfs_objects.create(oid: 'def456', size: 200) }
+
+  let!(:source_project_lop_1) do
+    lfs_objects_projects.create(
+      lfs_object_id: lfs_object.id,
+      project_id: source_project.id
+    )
+  end
+
+  let!(:source_project_lop_2) do
+    lfs_objects_projects.create(
+      lfs_object_id: another_lfs_object.id,
+      project_id: source_project.id
+    )
+  end
+
+  let!(:another_source_project_lop_1) do
+    lfs_objects_projects.create(
+      lfs_object_id: lfs_object.id,
+      project_id: another_source_project.id
+    )
+  end
+
+  let!(:another_source_project_lop_2) do
+    lfs_objects_projects.create(
+      lfs_object_id: another_lfs_object.id,
+      project_id: another_source_project.id
+    )
+  end
+
+  before do
+    stub_const("#{described_class}::BATCH_SIZE", 2)
+
+    # Create links between projects
+    fork_network_members.create(fork_network_id: fork_network.id, project_id: source_project.id, forked_from_project_id: nil)
+
+    [project, partially_linked_project, fully_linked_project].each do |p|
+      fork_network_members.create(
+        fork_network_id: fork_network.id,
+        project_id: p.id,
+        forked_from_project_id: fork_network.root_project_id
+      )
+    end
+
+    fork_network_members.create(fork_network_id: another_fork_network.id, project_id: another_source_project.id, forked_from_project_id: nil)
+    fork_network_members.create(fork_network_id: another_fork_network.id, project_id: another_project.id, forked_from_project_id: another_fork_network.root_project_id)
+
+    # Links LFS objects to some projects
+    lfs_objects_projects.create(lfs_object_id: lfs_object.id, project_id: fully_linked_project.id)
+    lfs_objects_projects.create(lfs_object_id: another_lfs_object.id, project_id: fully_linked_project.id)
+    lfs_objects_projects.create(lfs_object_id: lfs_object.id, project_id: partially_linked_project.id)
+  end
+
+  context 'when there are LFS objects to be linked' do
+    it 'creates LfsObjectsProject records for forks based on the specified range of LfsObjectProject id' do
+      expect_next_instance_of(Gitlab::BackgroundMigration::Logger) do |logger|
+        expect(logger).to receive(:info).exactly(4).times
+      end
+
+      expect { subject.perform(source_project_lop_1.id, another_source_project_lop_2.id) }.to change { lfs_objects_projects.count }.by(5)
+
+      expect(lfs_object_ids_for(project)).to match_array(lfs_object_ids_for(source_project))
+      expect(lfs_object_ids_for(another_project)).to match_array(lfs_object_ids_for(another_source_project))
+      expect(lfs_object_ids_for(partially_linked_project)).to match_array(lfs_object_ids_for(source_project))
+
+      expect { subject.perform(source_project_lop_1.id, another_source_project_lop_2.id) }.not_to change { lfs_objects_projects.count }
+    end
+  end
+
+  context 'when there are no LFS objects to be linked' do
+    before do
+      # Links LFS objects to all projects
+      projects.all.each do |p|
+        lfs_objects_projects.create(lfs_object_id: lfs_object.id, project_id: p.id)
+        lfs_objects_projects.create(lfs_object_id: another_lfs_object.id, project_id: p.id)
+      end
+    end
+
+    it 'does not create LfsObjectProject records' do
+      expect { subject.perform(source_project_lop_1.id, another_source_project_lop_2.id) }
+        .not_to change { lfs_objects_projects.count }
+    end
+  end
+
+  def lfs_object_ids_for(project)
+    lfs_objects_projects.where(project_id: project.id).pluck(:lfs_object_id)
+  end
+end