test(manager): manager need to exports updateDependency or extractPackageFile when exporting extractAllPackageFiles

docs/development/adding-a-package-manager.md

@@ -71,6 +71,8 @@ As another example, in order for Gradle to extract dependencies Renovate must fi
 The `extractAllPackageFiles` function takes an array of filenames as input.
 It returns an array of filenames and dependencies.
 
+If you implement `extractAllPackageFiles` the manger must export as well either `updateDependency` or `extractPackageFile`.
+
 ### `getRangeStrategy(config)` (optional)
 
 Write this optional function if you want the manager to support "auto" range strategies.

lib/modules/manager/index.spec.ts

@@ -59,6 +59,14 @@ describe('modules/manager/index', () => {
       if (!module.extractPackageFile && !module.extractAllPackageFiles) {
         return false;
       }
+      // managers must export either extractPackageFile or a custom updateDependency function in addition to extractAllPackageFiles
+      if (
+        module.extractAllPackageFiles &&
+        !module.extractPackageFile &&
+        !module.updateDependency
+      ) {
+        return false;
+      }
       if (Object.values(module).some((v) => v === undefined)) {
         return false;
       }