report(flow): category tooltips

flow-report/assets/styles.css

@@ -19,6 +19,7 @@
   --summary-flow-step-label-font-size: 16px;
   --summary-subtitle-font-size: 16px;
   --summary-title-font-size: 32px;
+  --summary-tooltip-box-shadow-color: rgba(0, 0, 0, 0.25);
   --topbar-title-font-size: 14px;
 }
 
@@ -292,9 +293,59 @@
   text-decoration: underline;
 }
 
-.SummaryCategory {
+.SummaryCategory__content {
+  position: relative;
   margin: var(--half-base-spacing);
 }
+.SummaryCategory__content:hover,
+.SummaryCategory__content:focus-within {
+  background-color: var(--color-gray-100);
+}
+.SummaryCategory__content:hover .SummaryTooltip,
+.SummaryCategory__content:focus-within .SummaryTooltip {
+  display: block;
+}
+
+.SummaryTooltip {
+  display: none;
+  position: absolute;
+  min-width: 200%;
+  max-width: 300%;
+  width: max-content;
+  background-color: var(--report-background-color);
+  border: 1px solid var(--color-gray-900);
+  border-radius: 5px;
+  padding: var(--base-spacing);
+  right: 0;
+  box-shadow: 0px 4px 4px var(--summary-tooltip-box-shadow-color);
+  z-index: 1;
+}
+
+.SummaryTooltip__title {
+  font-weight: bold;
+  margin-bottom: var(--half-base-spacing);
+}
+
+.SummaryTooltip__category {
+  font-weight: bold;
+  display: flex;
+  margin-top: var(--half-base-spacing);
+}
+
+.SummaryTooltip__category-title {
+  flex-grow: 1;
+}
+
+.SummaryTooltip__rating--pass {
+  color: var(--color-pass);
+}
+.SummaryTooltip__rating--average {
+  color: var(--color-average);
+}
+.SummaryTooltip__rating--fail,
+.SummaryTooltip__rating--error {
+  color: var(--color-fail);
+}
 
 .SummaryNavigationHeader {
   font-size: var(--summary-flow-step-label-font-size);

flow-report/src/summary/category.tsx

@@ -0,0 +1,92 @@
+/**
+ * @license Copyright 2021 The Lighthouse Authors. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+
+import {FunctionComponent} from 'preact';
+
+import {Util} from '../../../report/renderer/util';
+import {Separator} from '../common';
+import {CategoryScore} from '../wrappers/category-score';
+
+const GATHER_MODE_LABELS: Record<LH.Result.GatherMode, string> = {
+  'navigation': 'Navigation report',
+  'timespan': 'Timespan report',
+  'snapshot': 'Snapshot report',
+};
+
+const RATING_LABELS: Record<string, string> = {
+  'pass': 'Good',
+  'fail': 'Poor',
+  'average': 'Average',
+  'error': 'Error',
+};
+
+export const SummaryTooltip: FunctionComponent<{
+  category: LH.ReportResult.Category,
+  gatherMode: LH.Result.GatherMode
+}> = ({category, gatherMode}) => {
+  const {numPassed, numAudits, totalWeight} = Util.calculateCategoryFraction(category);
+
+  const displayAsFraction = Util.shouldDisplayAsFraction(gatherMode);
+  const rating = displayAsFraction ?
+    Util.calculateRating(numPassed / numAudits) :
+    Util.calculateRating(category.score);
+
+  return (
+    <div className="SummaryTooltip">
+      <div className="SummaryTooltip__title">{GATHER_MODE_LABELS[gatherMode]}</div>
+      <Separator/>
+      <div className="SummaryTooltip__category">
+        <div className="SummaryTooltip__category-title">
+          {category.title}
+        </div>
+        {
+          totalWeight !== 0 &&
+            <div
+              className={`SummaryTooltip__rating SummaryTooltip__rating--${rating}`}
+              data-testid="SummaryTooltip__rating"
+            >
+              <span>{RATING_LABELS[rating]}</span>
+              {
+                !displayAsFraction && category.score && <>
+                  <span> · </span>
+                  <span>{category.score * 100}</span>
+                </>
+              }
+            </div>
+        }
+      </div>
+      <div className="SummaryTooltip__fraction">
+        {`${numPassed} audits passed / ${numAudits} audits run`}
+      </div>
+    </div>
+  );
+};
+
+export const SummaryCategory: FunctionComponent<{
+  category: LH.ReportResult.Category|undefined,
+  href: string,
+  gatherMode: LH.Result.GatherMode,
+}> = ({category, href, gatherMode}) => {
+  return (
+    <div className="SummaryCategory">
+      {
+        category ?
+          <div className="SummaryCategory__content">
+            <CategoryScore
+              category={category}
+              href={href}
+              gatherMode={gatherMode}
+            />
+            <SummaryTooltip category={category} gatherMode={gatherMode}/>
+          </div> :
+          <div
+            className="SummaryCategory__null"
+            data-testid="SummaryCategory__null"
+          />
+      }
+    </div>
+  );
+};

flow-report/src/summary/summary.tsx

@@ -10,7 +10,7 @@ import {useMemo} from 'preact/hooks';
 import {FlowSegment, Separator} from '../common';
 import {getScreenDimensions, getScreenshot, useFlowResult} from '../util';
 import {Util} from '../../../report/renderer/util';
-import {CategoryScore} from '../wrappers/category-score';
+import {SummaryCategory} from './category';
 
 const DISPLAYED_CATEGORIES = ['performance', 'accessibility', 'best-practices', 'seo'];
 const THUMBNAIL_WIDTH = 50;
@@ -33,29 +33,6 @@ const SummaryNavigationHeader: FunctionComponent<{url: string}> = ({url}) => {
   );
 };
 
-const SummaryCategory: FunctionComponent<{
-  category: LH.ReportResult.Category|undefined,
-  href: string,
-  gatherMode: LH.Result.GatherMode,
-}> = ({category, href, gatherMode}) => {
-  return (
-    <div className="SummaryCategory">
-      {
-        category ?
-          <CategoryScore
-            category={category}
-            href={href}
-            gatherMode={gatherMode}
-          /> :
-          <div
-            className="SummaryCategory__null"
-            data-testid="SummaryCategory__null"
-          />
-      }
-    </div>
-  );
-};
-
 /**
  * The div should behave like a JSX <>...</>. This still allows us to identify "rows" with CSS selectors.
  */

flow-report/test/summary/category-test.tsx

@@ -0,0 +1,68 @@
+/**
+ * @license Copyright 2021 The Lighthouse Authors. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
+ */
+
+import fs from 'fs';
+import {dirname} from 'path';
+import {fileURLToPath} from 'url';
+
+import {render} from '@testing-library/preact';
+
+import {SummaryTooltip} from '../../src/summary/category';
+import {Util} from '../../../report/renderer/util';
+
+const flowResult: LH.FlowResult = JSON.parse(
+  fs.readFileSync(
+    // eslint-disable-next-line max-len
+    `${dirname(fileURLToPath(import.meta.url))}/../../../lighthouse-core/test/fixtures/fraggle-rock/reports/sample-lhrs.json`,
+    'utf-8'
+  )
+);
+
+describe('SummaryTooltip', () => {
+  it('renders tooltip with rating', async () => {
+    // Snapshot SEO
+    const reportResult = Util.prepareReportResult(flowResult.steps[2].lhr);
+    const category = reportResult.categories['seo'];
+
+    const root = render(
+      <SummaryTooltip category={category} gatherMode={reportResult.gatherMode}/>
+    );
+
+    const rating = root.getByTestId('SummaryTooltip__rating');
+    expect(rating.classList).toContain('SummaryTooltip__rating--average');
+
+    expect(root.getByText('9 audits passed / 11 audits run')).toBeTruthy();
+  });
+
+  it('renders tooltip without rating', async () => {
+    // Snapshot performance
+    const reportResult = Util.prepareReportResult(flowResult.steps[2].lhr);
+    const category = reportResult.categories['performance'];
+
+    const root = render(
+      <SummaryTooltip category={category} gatherMode={reportResult.gatherMode}/>
+    );
+
+    expect(() => root.getByTestId('SummaryTooltip__rating')).toThrow();
+    expect(root.getByText('2 audits passed / 4 audits run')).toBeTruthy();
+  });
+
+  it('renders scored category tooltip with score', async () => {
+    // Navigation performance
+    const reportResult = Util.prepareReportResult(flowResult.steps[0].lhr);
+    const category = reportResult.categories['performance'];
+
+    const root = render(
+      <SummaryTooltip category={category} gatherMode={reportResult.gatherMode}/>
+    );
+
+    const rating = root.getByTestId('SummaryTooltip__rating');
+    expect(rating.classList).toContain('SummaryTooltip__rating--pass');
+    expect(rating.textContent).toEqual('Good · 94');
+
+    expect(root.getByText('41 audits passed / 58 audits run')).toBeTruthy();
+  });
+});

lighthouse-core/util-commonjs.js

@@ -509,6 +509,28 @@ class Util {
   static isPluginCategory(categoryId) {
     return categoryId.startsWith('lighthouse-plugin-');
   }
+
+  /**
+   * @param {LH.Result.GatherMode} gatherMode
+   */
+  static shouldDisplayAsFraction(gatherMode) {
+    return gatherMode === 'timespan' || gatherMode === 'snapshot';
+  }
+
+  /**
+   * @param {LH.ReportResult.Category} category
+   */
+  static calculateCategoryFraction(category) {
+    const numAudits = category.auditRefs.length;
+
+    let numPassed = 0;
+    let totalWeight = 0;
+    for (const auditRef of category.auditRefs) {
+      totalWeight += auditRef.weight;
+      if (Util.showAsPassed(auditRef.result)) numPassed++;
+    }
+    return {numPassed, numAudits, totalWeight};
+  }
 }
 
 /**

report/renderer/category-renderer.js

@@ -319,7 +319,7 @@ export class CategoryRenderer {
    * @return {DocumentFragment}
    */
   renderCategoryScore(category, groupDefinitions, options) {
-    if (options && (options.gatherMode === 'snapshot' || options.gatherMode === 'timespan')) {
+    if (options && Util.shouldDisplayAsFraction(options.gatherMode)) {
       return this.renderCategoryFraction(category);
     }
     return this.renderScoreGauge(category, groupDefinitions);
@@ -376,14 +376,7 @@ export class CategoryRenderer {
     const wrapper = this.dom.find('a.lh-fraction__wrapper', tmpl);
     this.dom.safelySetHref(wrapper, `#${category.id}`);
 
-    const numAudits = category.auditRefs.length;
-
-    let numPassed = 0;
-    let totalWeight = 0;
-    for (const auditRef of category.auditRefs) {
-      totalWeight += auditRef.weight;
-      if (Util.showAsPassed(auditRef.result)) numPassed++;
-    }
+    const {numPassed, numAudits, totalWeight} = Util.calculateCategoryFraction(category);
 
     const fraction = numPassed / numAudits;
     const content = this.dom.find('.lh-fraction__content', tmpl);

report/renderer/util.js

@@ -506,6 +506,28 @@ export class Util {
   static isPluginCategory(categoryId) {
     return categoryId.startsWith('lighthouse-plugin-');
   }
+
+  /**
+   * @param {LH.Result.GatherMode} gatherMode
+   */
+  static shouldDisplayAsFraction(gatherMode) {
+    return gatherMode === 'timespan' || gatherMode === 'snapshot';
+  }
+
+  /**
+   * @param {LH.ReportResult.Category} category
+   */
+  static calculateCategoryFraction(category) {
+    const numAudits = category.auditRefs.length;
+
+    let numPassed = 0;
+    let totalWeight = 0;
+    for (const auditRef of category.auditRefs) {
+      totalWeight += auditRef.weight;
+      if (Util.showAsPassed(auditRef.result)) numPassed++;
+    }
+    return {numPassed, numAudits, totalWeight};
+  }
 }
 
 /**

report/test/renderer/util-test.js

@@ -386,4 +386,30 @@ describe('util helpers', () => {
       ]);
     });
   });
+
+  describe('#shouldDisplayAsFraction', () => {
+    it('returns true for timespan and snapshot', () => {
+      expect(Util.shouldDisplayAsFraction('navigation')).toEqual(false);
+      expect(Util.shouldDisplayAsFraction('timespan')).toEqual(true);
+      expect(Util.shouldDisplayAsFraction('snapshot')).toEqual(true);
+      expect(Util.shouldDisplayAsFraction(undefined)).toEqual(false);
+    });
+  });
+
+  describe('#calculateCategoryFraction', () => {
+    it('returns passed audits and total audits', () => {
+      const category = {
+        auditRefs: [
+          {weight: 3, result: {score: 1, scoreDisplayMode: 'binary'}},
+          {weight: 2, result: {score: 1, scoreDisplayMode: 'binary'}},
+          {weight: 0, result: {score: 1, scoreDisplayMode: 'binary'}},
+          {weight: 1, result: {score: 0, scoreDisplayMode: 'binary'}},
+        ],
+      };
+      const {numPassed, numAudits, totalWeight} = Util.calculateCategoryFraction(category);
+      expect(numPassed).toEqual(3);
+      expect(numAudits).toEqual(4);
+      expect(totalWeight).toEqual(6);
+    });
+  });
 });