test: improve visual tests setup, update screenshots

wtr-utils.js

@@ -26,6 +26,30 @@ const getAllPackages = () => {
     .filter((dir) => fs.statSync(`packages/${dir}`).isDirectory() && fs.existsSync(`packages/${dir}/test`));
 };
 
+/**
+ * Get all available packages with visual tests.
+ */
+const getAllVisualPackages = () => {
+  return fs
+    .readdirSync('packages')
+    .filter((dir) => fs.statSync(`packages/${dir}`).isDirectory() && fs.existsSync(`packages/${dir}/test/visual`));
+};
+
+/**
+ * Gel all packages with updated reference screenshots.
+ */
+const getUpdatedScreenshotsPackages = () => {
+  const packages = new Set();
+  const log = execSync('git diff --name-only origin/master HEAD').toString();
+  log.split('\n').forEach((line) => {
+    if (line.startsWith('screenshots')) {
+      const data = line.split('/');
+      packages.add(`vaadin-${data[data.length - 2]}`);
+    }
+  });
+  return [...packages];
+};
+
 /**
  * Get packages for running unit tests.
  */
@@ -61,12 +85,13 @@ const getUnitTestPackages = () => {
 const getVisualTestPackages = () => {
   // If --group flag is passed, return all packages.
   if (group) {
-    return getAllPackages();
+    return getAllVisualPackages();
   }
 
   let packages = getChangedPackages()
     .map((project) => project.name.replace('@vaadin/', ''))
-    .filter((project) => NO_UNIT_TESTS.indexOf(project) === -1 && project.indexOf('mixin') === -1);
+    .filter((project) => NO_UNIT_TESTS.indexOf(project) === -1 && project.indexOf('mixin') === -1)
+    .concat(getUpdatedScreenshotsPackages());
 
   if (packages.length == 0) {
     // When running in GitHub Actions, do nothing.
@@ -75,9 +100,11 @@ const getVisualTestPackages = () => {
       process.exit(0);
     } else {
       console.log(`No local packages have changed, testing all packages.`);
-      packages = getAllPackages();
+      packages = getAllVisualPackages();
     }
   } else {
+    // Filter out possible duplicates from packages list
+    packages = packages.filter((v, i, a) => a.indexOf(v) === i);
     console.log(`Running tests for changed packages:\n${packages.join('\n')}`);
   }