1 files changed, 93 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/populate_fork_networks_range_spec.rb b/spec/lib/gitlab/background_migration/populate_fork_networks_range_spec.rb
new file mode 100644
index 00000000000..2c2684a6fc9
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/populate_fork_networks_range_spec.rb
@@ -0,0 +1,93 @@
+require 'spec_helper'
+
+describe Gitlab::BackgroundMigration::PopulateForkNetworksRange, :migration, schema: 20170929131201 do
+  let(:migration) { described_class.new }
+  let(:base1) { create(:project) }
+  let(:base1_fork1) { create(:project) }
+  let(:base1_fork2) { create(:project) }
+
+  let(:base2) { create(:project) }
+  let(:base2_fork1) { create(:project) }
+  let(:base2_fork2) { create(:project) }
+
+  let!(:forked_project_links) { table(:forked_project_links) }
+  let!(:fork_networks) { table(:fork_networks) }
+  let!(:fork_network_members) { table(:fork_network_members) }
+
+  let(:fork_network1) { fork_networks.find_by(root_project_id: base1.id) }
+  let(:fork_network2) { fork_networks.find_by(root_project_id: base2.id) }
+
+  before do
+    # A normal fork link
+    forked_project_links.create(id: 1,
+                                forked_from_project_id: base1.id,
+                                forked_to_project_id: base1_fork1.id)
+    forked_project_links.create(id: 2,
+                                forked_from_project_id: base1.id,
+                                forked_to_project_id: base1_fork2.id)
+
+    forked_project_links.create(id: 3,
+                                forked_from_project_id: base2.id,
+                                forked_to_project_id: base2_fork1.id)
+    forked_project_links.create(id: 4,
+                                forked_from_project_id: base2_fork1.id,
+                                forked_to_project_id: create(:project).id)
+
+    forked_project_links.create(id: 5,
+                                forked_from_project_id: base2.id,
+                                forked_to_project_id: base2_fork2.id)
+
+    migration.perform(1, 3)
+  end
+
+  it 'it creates the fork network' do
+    expect(fork_network1).not_to be_nil
+    expect(fork_network2).not_to be_nil
+  end
+
+  it 'does not create a fork network for a fork-of-fork' do
+    # perfrom the entire batch
+    migration.perform(1, 5)
+
+    expect(fork_networks.find_by(root_project_id: base2_fork1.id)).to be_nil
+  end
+
+  it 'creates memberships for the root of fork networks' do
+    base1_membership = fork_network_members.find_by(fork_network_id: fork_network1.id,
+                                                    project_id: base1.id)
+    base2_membership = fork_network_members.find_by(fork_network_id: fork_network2.id,
+                                                    project_id: base2.id)
+
+    expect(base1_membership).not_to be_nil
+    expect(base2_membership).not_to be_nil
+  end
+
+  it 'skips links that had their source project deleted' do
+    forked_project_links.create(id: 6, forked_from_project_id: 99999, forked_to_project_id: create(:project).id)
+
+    migration.perform(5, 8)
+
+    expect(fork_networks.find_by(root_project_id: 99999)).to be_nil
+  end
+
+  it 'schedules a job for inserting memberships for forks-of-forks' do
+    delay = Gitlab::BackgroundMigration::CreateForkNetworkMembershipsRange::RESCHEDULE_DELAY
+
+    expect(BackgroundMigrationWorker)
+      .to receive(:perform_in).with(delay, "CreateForkNetworkMembershipsRange", [1, 3])
+
+    migration.perform(1, 3)
+  end
+
+  it 'only processes a single batch of links at a time' do
+    expect(fork_network_members.count).to eq(5)
+
+    migration.perform(3, 5)
+
+    expect(fork_network_members.count).to eq(7)
+  end
+
+  it 'can be repeated without effect' do
+    expect { migration.perform(1, 3) }.not_to change { fork_network_members.count }
+  end
+end