Add spec for FastDestroyAll

spec/models/concerns/fast_destroy_all_spec.rb

+require 'spec_helper'
+
+describe FastDestroyAll, :clean_gitlab_redis_shared_state do
+  let(:project) { create(:project) }
+  let(:pipeline) { create(:ci_pipeline, project: project) }
+
+  before do
+    stub_feature_flags(ci_enable_live_trace: true)
+  end
+
+  describe 'Forbid #destroy and #destroy_all' do
+    let(:build) { create(:ci_build, :running, :trace_live, pipeline: pipeline, project: project) }
+    let(:trace_chunks) { build.trace_chunks }
+
+    it 'does not delete database rows and associted external data' do
+      expect(trace_chunks.first).to be_a(described_class)
+
+      Gitlab::Redis::SharedState.with do |redis|
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(1)
+        expect(trace_chunks.count).to eq(1)
+
+        expect { trace_chunks.first.destroy }.to raise_error('`destroy` and `destroy_all` are forbbiden. Please use `fast_destroy_all`')
+        expect { trace_chunks.destroy_all }.to raise_error('`destroy` and `destroy_all` are forbbiden. Please use `fast_destroy_all`')
+
+        expect(trace_chunks.count).to eq(1)
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(1)
+      end
+    end
+  end
+
+  describe '.fast_destroy_all' do
+    let(:build) { create(:ci_build, :running, :trace_live, pipeline: pipeline, project: project) }
+    let(:trace_chunks) { build.trace_chunks }
+
+    it 'deletes database rows and associted external data' do
+      expect(trace_chunks.first).to be_a(described_class)
+
+      Gitlab::Redis::SharedState.with do |redis|
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(1)
+        expect(trace_chunks.count).to eq(1)
+
+        expect { build.trace_chunks.fast_destroy_all }.not_to raise_error
+
+        expect(trace_chunks.count).to eq(0)
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(0)
+      end
+    end
+  end
+
+  describe '.use_fast_destroy' do
+    let(:build) { create(:ci_build, :running, :trace_live, pipeline: pipeline, project: project) }
+    let(:trace_chunks) { build.trace_chunks }
+
+    it 'performs cascading delete with fast_destroy_all' do
+      expect(trace_chunks.first).to be_a(described_class)
+      expect(project).to be_a(described_class::Helpers)
+
+      Gitlab::Redis::SharedState.with do |redis|
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(1)
+        expect(trace_chunks.count).to eq(1)
+
+        project.destroy
+
+        expect(trace_chunks.count).to eq(0)
+        expect(redis.scan_each(match: "gitlab:ci:trace:*:chunks:*").to_a.size).to eq(0)
+      end
+    end
+  end
+end