diff --git a/lighthouse-core/test/report/html/renderer/report-renderer-test.js b/lighthouse-core/test/report/html/renderer/report-renderer-test.js
index 56f70f363480..d921e8788dda 100644
--- a/lighthouse-core/test/report/html/renderer/report-renderer-test.js
+++ b/lighthouse-core/test/report/html/renderer/report-renderer-test.js
@@ -21,7 +21,7 @@ let PerformanceCategoryRenderer = null;
 const CriticalRequestChainRenderer = require(
     '../../../../report/html/renderer/crc-details-renderer.js');
 const ReportRenderer = require('../../../../report/html/renderer/report-renderer.js');
-const sampleResults = require('../../../results/sample_v2.json');
+const sampleResultsOrig = require('../../../results/sample_v2.json');
 
 const TIMESTAMP_REGEX = /\d+, \d{4}.*\d+:\d+/;
 const TEMPLATE_FILE = fs.readFileSync(__dirname +
@@ -29,6 +29,7 @@ const TEMPLATE_FILE = fs.readFileSync(__dirname +
 
 describe('ReportRenderer', () => {
   let renderer;
+  let sampleResults;
 
   beforeAll(() => {
     global.URL = URL;
@@ -57,7 +58,7 @@ describe('ReportRenderer', () => {
     const detailsRenderer = new DetailsRenderer(dom);
     const categoryRenderer = new CategoryRenderer(dom, detailsRenderer);
     renderer = new ReportRenderer(dom, categoryRenderer);
-    sampleResults.reportCategories = Object.values(sampleResults.categories);
+    sampleResults = Util.prepareReportResult(sampleResultsOrig);
   });
 
   afterAll(() => {
diff --git a/lighthouse-core/test/report/html/renderer/util-test.js b/lighthouse-core/test/report/html/renderer/util-test.js
index 93aab1eb7696..a06aa7c6ff82 100644
--- a/lighthouse-core/test/report/html/renderer/util-test.js
+++ b/lighthouse-core/test/report/html/renderer/util-test.js
@@ -8,7 +8,6 @@
 const assert = require('assert');
 const Util = require('../../../../report/html/renderer/util.js');
 
-const ReportRenderer = require('../../../../report/html/renderer/report-renderer.js');
 const sampleResults = require('../../../results/sample_v2.json');
 
 const NBSP = '\xa0';
@@ -169,29 +168,26 @@ describe('util helpers', () => {
   });
 
   describe('getFinalScreenshot', () => {
-    const cloneResults = Util.prepareReportResult(sampleResults);
-
     it('gets a datauri as a string', () => {
+      const cloneResults = Util.prepareReportResult(sampleResults);
       const datauri = Util.getFinalScreenshot(cloneResults);
       assert.equal(typeof datauri, 'string');
       assert.ok(datauri.startsWith('data:image/jpeg;base64,'));
     });
 
     it('returns null if there is no perf category', () => {
-      const lhrWithoutPerf = JSON.parse(JSON.stringify(sampleResults));
-      delete lhrWithoutPerf.categories.performance;
-      lhrWithoutPerf.reportCategories = Object.values(lhrWithoutPerf.categories);
+      const clonedResults = JSON.parse(JSON.stringify(sampleResults));
+      delete clonedResults.categories.performance;
+      const lhrWithoutPerf = Util.prepareReportResult(clonedResults);
 
       const datauri = Util.getFinalScreenshot(lhrWithoutPerf);
       assert.equal(datauri, null);
     });
 
     it('returns null if there is no final-screenshot audit', () => {
-      const lhrNoFinalSS = JSON.parse(JSON.stringify(sampleResults));
-      delete lhrNoFinalSS.audits['final-screenshot'];
-      lhrNoFinalSS.reportCategories = Object.values(lhrNoFinalSS.categories);
-      ReportRenderer.smooshAuditResultsIntoCategories(lhrNoFinalSS.audits,
-        lhrNoFinalSS.reportCategories);
+      const clonedResults = JSON.parse(JSON.stringify(sampleResults));
+      delete clonedResults.audits['final-screenshot'];
+      const lhrNoFinalSS = Util.prepareReportResult(clonedResults);
 
       const datauri = Util.getFinalScreenshot(lhrNoFinalSS);
       assert.equal(datauri, null);