Move from let! to let_it_be to optimize performance

ee/spec/models/security/finding_spec.rb

@@ -3,6 +3,11 @@
 require 'spec_helper'
 
 RSpec.describe Security::Finding do
+  let_it_be(:scan_1) { create(:security_scan, scan_type: :sast) }
+  let_it_be(:scan_2) { create(:security_scan, scan_type: :dast) }
+  let_it_be(:finding_1) { create(:security_finding, scan: scan_1) }
+  let_it_be(:finding_2) { create(:security_finding, scan: scan_2) }
+
   describe 'associations' do
     it { is_expected.to belong_to(:scan).required }
     it { is_expected.to belong_to(:scanner).required }
@@ -20,8 +25,6 @@ RSpec.describe Security::Finding do
   end
 
   describe '.by_uuid' do
-    let!(:finding_1) { create(:security_finding) }
-    let!(:finding_2) { create(:security_finding) }
     let(:expected_findings) { [finding_1] }
 
     subject { described_class.by_uuid(finding_1.uuid) }
@@ -30,40 +33,39 @@ RSpec.describe Security::Finding do
   end
 
   describe '.by_build_ids' do
-    let!(:finding_1) { create(:security_finding) }
-    let!(:finding_2) { create(:security_finding) }
-
     subject { described_class.by_build_ids(finding_1.scan.build_id) }
 
     it { is_expected.to eq([finding_1]) }
   end
 
   describe '.by_severity_levels' do
-    let!(:critical_severity_finding) { create(:security_finding, severity: :critical) }
-    let!(:high_severity_finding) { create(:security_finding, severity: :high) }
-    let(:expected_findings) { [critical_severity_finding] }
+    let(:expected_findings) { [finding_2] }
 
     subject { described_class.by_severity_levels(:critical) }
 
+    before do
+      finding_1.update! severity: :high
+      finding_2.update! severity: :critical
+    end
+
     it { is_expected.to match_array(expected_findings) }
   end
 
   describe '.by_confidence_levels' do
-    let!(:high_confidence_finding) { create(:security_finding, confidence: :high) }
-    let!(:low_confidence_finding) { create(:security_finding, confidence: :low) }
-    let(:expected_findings) { [high_confidence_finding] }
+    let(:expected_findings) { [finding_2] }
 
     subject { described_class.by_confidence_levels(:high) }
 
+    before do
+      finding_1.update! confidence: :low
+      finding_2.update! confidence: :high
+    end
+
     it { is_expected.to match_array(expected_findings) }
   end
 
   describe '.by_report_types' do
-    let!(:sast_scan) { create(:security_scan, scan_type: :sast) }
-    let!(:dast_scan) { create(:security_scan, scan_type: :dast) }
-    let!(:sast_finding) { create(:security_finding, scan: sast_scan) }
-    let!(:dast_finding) { create(:security_finding, scan: dast_scan) }
-    let(:expected_findings) { [sast_finding] }
+    let(:expected_findings) { [finding_1] }
 
     subject { described_class.by_report_types(:sast) }
 
@@ -71,8 +73,6 @@ RSpec.describe Security::Finding do
   end
 
   describe '.by_project_fingerprints' do
-    let!(:finding_1) { create(:security_finding) }
-    let!(:finding_2) { create(:security_finding) }
     let(:expected_findings) { [finding_1] }
 
     subject { described_class.by_project_fingerprints(finding_1.project_fingerprint) }
@@ -81,64 +81,63 @@ RSpec.describe Security::Finding do
   end
 
   describe '.undismissed' do
-    let(:scan_1) { create(:security_scan) }
-    let(:scan_2) { create(:security_scan) }
-    let!(:undismissed_finding) { create(:security_finding, scan: scan_1) }
-    let!(:dismissed_finding) { create(:security_finding, scan: scan_1) }
-    let(:expected_findings) { [undismissed_finding] }
+    let(:expected_findings) { [finding_2] }
 
     subject { described_class.undismissed }
 
     before do
+      finding_2.update! scan: scan_1
+
       create(:vulnerability_feedback,
              :dismissal,
              project: scan_1.project,
              category: scan_1.scan_type,
-             project_fingerprint: dismissed_finding.project_fingerprint)
+             project_fingerprint: finding_1.project_fingerprint)
 
       create(:vulnerability_feedback,
              :dismissal,
              project: scan_2.project,
              category: scan_2.scan_type,
-             project_fingerprint: undismissed_finding.project_fingerprint)
+             project_fingerprint: finding_2.project_fingerprint)
     end
 
     it { is_expected.to match_array(expected_findings) }
   end
 
   describe '.ordered' do
-    let!(:finding_1) { create(:security_finding, severity: :high, confidence: :unknown) }
-    let!(:finding_2) { create(:security_finding, severity: :low, confidence: :confirmed) }
-    let!(:finding_3) { create(:security_finding, severity: :critical, confidence: :confirmed) }
-    let!(:finding_4) { create(:security_finding, severity: :critical, confidence: :high) }
+    let_it_be(:finding_3) { create(:security_finding, severity: :critical, confidence: :confirmed) }
+    let_it_be(:finding_4) { create(:security_finding, severity: :critical, confidence: :high) }
 
     let(:expected_findings) { [finding_3, finding_4, finding_1, finding_2] }
 
     subject { described_class.ordered }
 
+    before do
+      finding_1.update!(severity: :high, confidence: :unknown)
+      finding_2.update!(severity: :low, confidence: :confirmed)
+    end
+
     it { is_expected.to eq(expected_findings) }
   end
 
   describe '.deduplicated' do
-    let!(:finding_1) { create(:security_finding, deduplicated: true) }
-    let!(:finding_2) { create(:security_finding, deduplicated: false) }
-
     let(:expected_findings) { [finding_1] }
 
     subject { described_class.deduplicated }
 
+    before do
+      finding_1.update! deduplicated: true
+      finding_2.update! deduplicated: false
+    end
+
     it { is_expected.to eq(expected_findings) }
   end
 
   describe '.count_by_scan_type' do
-    let!(:sast_scan) { create(:security_scan, scan_type: :sast) }
-    let!(:dast_scan) { create(:security_scan, scan_type: :dast) }
-    let!(:finding_1) { create(:security_finding, scan: sast_scan) }
-    let!(:finding_2) { create(:security_finding, scan: sast_scan) }
-    let!(:finding_3) { create(:security_finding, scan: dast_scan) }
-
     subject { described_class.count_by_scan_type }
 
+    let_it_be(:finding_3) { create(:security_finding, scan: scan_1) }
+
     it {
       is_expected.to eq({
         Security::Scan.scan_types['dast'] => 1,