core(config): special case full-page-screenshot audit in filtering

lighthouse-core/config/config.js

@@ -656,6 +656,16 @@ class Config {
       }
     });
 
+    // The `full-page-screenshot` audit belongs to no category, but we still want to include
+    // it (unless explictly excluded) because there are audits in every category that can use it.
+    if (settings.onlyCategories) {
+      const explicitlyExcludesFullPageScreenshot =
+        settings.skipAudits && settings.skipAudits.includes('full-page-screenshot');
+      if (!explicitlyExcludesFullPageScreenshot) {
+        includedAudits.add('full-page-screenshot');
+      }
+    }
+
     return {categories, requestedAuditNames: includedAudits};
   }
 

lighthouse-core/test/config/config-test.js

@@ -663,8 +663,11 @@ describe('Config', () => {
     });
 
     assert.ok(config.audits.length, 'inherited audits by extension');
-    assert.equal(config.audits.length, origConfig.categories.performance.auditRefs.length + 1);
+    // +1 for `is-on-https`, +1 for `full-page-screenshot`.
+    assert.equal(config.audits.length, origConfig.categories.performance.auditRefs.length + 2);
     assert.equal(config.passes.length, 1, 'filtered out passes');
+    assert.ok(config.audits.filter(a => a.implementation.meta.id === 'is-on-https'));
+    assert.ok(config.audits.filter(a => a.implementation.meta.id === 'full-page-screenshot'));
   });
 
   it('warns for invalid filters', () => {
@@ -1138,9 +1141,11 @@ describe('Config', () => {
       };
       const config = new Config(extended);
       const selectedCategory = origConfig.categories.performance;
-      const auditCount = Object.keys(selectedCategory.auditRefs).length;
+      // +1 for `full-page-screenshot`.
+      const auditCount = Object.keys(selectedCategory.auditRefs).length + 1;
 
       assert.equal(config.audits.length, auditCount, '# of audits match category list');
+      assert.ok(config.audits.filter(a => a.implementation.meta.id === 'full-page-screenshot'));
     });
 
     it('should only run specified audits', () => {
@@ -1165,9 +1170,12 @@ describe('Config', () => {
       };
       const config = new Config(extended);
       const selectedCategory = origConfig.categories.performance;
-      const auditCount = Object.keys(selectedCategory.auditRefs).length + 1;
+      // +1 for `works-offline`, +1 for `full-page-screenshot`.
+      const auditCount = Object.keys(selectedCategory.auditRefs).length + 2;
       assert.equal(config.passes.length, 2, 'incorrect # of passes');
       assert.equal(config.audits.length, auditCount, 'audit filtering failed');
+      assert.ok(config.audits.filter(a => a.implementation.meta.id === 'works-offline'));
+      assert.ok(config.audits.filter(a => a.implementation.meta.id === 'full-page-screenshot'));
     });
 
     it('should support redundant filtering', () => {
@@ -1180,9 +1188,29 @@ describe('Config', () => {
       };
       const config = new Config(extended);
       const selectedCategory = origConfig.categories.pwa;
-      const auditCount = Object.keys(selectedCategory.auditRefs).length;
+      // +1 for `full-page-screenshot`.
+      const auditCount = Object.keys(selectedCategory.auditRefs).length + 1;
       assert.equal(config.passes.length, 3, 'incorrect # of passes');
       assert.equal(config.audits.length, auditCount, 'audit filtering failed');
+      assert.ok(config.audits.filter(a => a.implementation.meta.id === 'full-page-screenshot'));
+    });
+
+    it('should keep uncategorized audits even if onlyCategories is set', () => {
+      assert.ok(origConfig.audits.includes('full-page-screenshot'));
+      // full-page-screenshot does not belong to a category.
+      const matchCategories = Object.values(origConfig.categories).filter(cat =>
+          cat.auditRefs.find(ref => ref.id === 'full-page-screenshot'));
+      assert.equal(matchCategories.length, 0);
+
+      const extended = {
+        extends: 'lighthouse:default',
+        settings: {
+          onlyCategories: ['accessibility'],
+        },
+      };
+      const config = new Config(extended);
+
+      assert.ok(config.audits.find(a => a.implementation.meta.id === 'full-page-screenshot'));
     });
   });
 

third-party/chromium-webtests/webtests/http/tests/devtools/lighthouse/lighthouse-successful-run-expected.txt

@@ -55,6 +55,7 @@ Gathering setup: Accessibility
 Gathering setup: TraceElements
 Gathering setup: InspectorIssues
 Gathering setup: SourceMaps
+Gathering setup: FullPageScreenshot
 Beginning devtoolsLog and trace
 Getting browser version
 Loading page & waiting for onload
@@ -86,6 +87,7 @@ Gathering in-page: Accessibility
 Gathering in-page: TraceElements
 Gathering in-page: InspectorIssues
 Gathering in-page: SourceMaps
+Gathering in-page: FullPageScreenshot
 Gathering trace
 Gathering devtoolsLog & network records
 Running afterPass methods
@@ -116,6 +118,7 @@ Gathering: Accessibility
 Gathering: TraceElements
 Gathering: InspectorIssues
 Gathering: SourceMaps
+Gathering: FullPageScreenshot
 Populate base artifacts
 Get webapp manifest
 Collect stacks
@@ -239,6 +242,7 @@ Auditing: Page has valid source maps
 Auditing: Preload Largest Contentful Paint image
 Computing artifact: LanternLargestContentfulPaint
 Computing artifact: LanternFirstContentfulPaint
+Auditing: Full-page screenshot
 Auditing: Site works cross-browser
 Auditing: Page transitions don't feel like they block on the network
 Auditing: Each page has a URL
@@ -455,6 +459,7 @@ font-display: pass
 font-size: fail
 form-field-multiple-labels: notApplicable
 frame-title: notApplicable
+full-page-screenshot: informative
 geolocation-on-start: pass
 gpt-bids-parallel: notApplicable
 heading-order: notApplicable

third-party/chromium-webtests/webtests/http/tests/devtools/lighthouse/lighthouse-view-trace-run-expected.txt

@@ -26,6 +26,7 @@ first-contentful-paint
 first-cpu-idle
 first-meaningful-paint
 font-display
+full-page-screenshot
 interactive
 largest-contentful-paint
 largest-contentful-paint-element