cli: add --successCache option for repo test

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/config/jest.js

@@ -306,7 +306,7 @@ async function getRootConfig() {
     ),
   ).then(_ => _.flat());
 
-  const configs = await Promise.all(
+  let configs = await Promise.all(
     projectPaths.flat().map(async projectPath => {
       const packagePath = path.resolve(projectPath, 'package.json');
       if (!(await fs.pathExists(packagePath))) {
@@ -331,9 +331,15 @@ async function getRootConfig() {
     }),
   ).then(cs => cs.filter(Boolean));
 
+  const cache = global.__backstageCli_jestSuccessCache;
+  if (cache) {
+    configs = await cache.filterConfigs(configs, globalRootConfig);
+  }
+
   return {
     rootDir: paths.targetRoot,
     projects: configs,
+    testResultsProcessor: require.resolve('./jestCacheResultProcessor.cjs'),
     ...globalRootConfig,
   };
 }

packages/cli/config/jestCacheResultProcessor.cjs

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * 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.
+ */
+
+module.exports = async results => {
+  const cache = global.__backstageCli_jestSuccessCache;
+  if (!cache) {
+    return results;
+  }
+
+  const successful = new Set();
+  const failed = new Set();
+  for (const testResult of results.testResults) {
+    const projectName = testResult.displayName.name;
+    if (testResult.numFailingTests > 0) {
+      failed.add(projectName);
+      successful.delete(projectName);
+    } else if (!failed.has(projectName)) {
+      successful.add(projectName);
+    }
+  }
+
+  await cache.reportResults({
+    successful: successful,
+  });
+
+  return results;
+};