exportModuleContent() dies on any non-existent UUID

Hi
Your use case sounds like you're using default_content for content deployment.
That is out of scope for this module.
It is designed for modules/install profiles to provide default content where either

1. the module/profile needs some defined content to function; or
2. the module/profile wants to demonstrate how something functions by providing sample content

Moving content between sites/environments is the domain of the deploy suite and entity pilot et al.
I don't want default content to become increasingly complex in an effort to use it for purposes beyond its original intent.
Thanks
Lee

I just faced with the same issue - need to update default content in install profile module

+++ b/tests/src/Kernel/DefaultContentManagerIntegrationTest.php
@@ -186,4 +186,27 @@ class DefaultContentManagerIntegrationTest extends KernelTestBase {
+    try {
+      $this->defaultContentManager->exportModuleContent('default_content_export_test');
+    }
+    catch (\InvalidArgumentException $e) {
+      ¶
+    }
+    $this->assertTrue($e instanceof \InvalidArgumentException);

better to change that to

try
  call
  assertFail
catch
  assertPass

So, you're letting content editors edit content for an install profile?
That is in scope, it just wasn't clear from the OP

Yep, I'm trying to use default content as "fixture" as addition to config_installer
This way simplifies dev workflow - no reason to use db dump from live/stage for local dev
I just need sometimes to update it)

+++ b/src/DefaultContentManager.php
@@ -290,6 +290,9 @@ class DefaultContentManager implements DefaultContentManagerInterface {
+          throw new \InvalidArgumentException(new FormattableMarkup('Entity @type with UUID @uuid does not exist', ['@type' => $entity_type, '@uuid' => $uuid]));

Nitpick|: Afaik we use sprintf for generating exception messages.

+++ b/tests/src/Kernel/DefaultContentManagerIntegrationTest.php
@@ -186,4 +186,21 @@ class DefaultContentManagerIntegrationTest extends KernelTestBase {
+   * @expectedException \InvalidArgumentException

Can you use ->setExpectedException instead of the annotation - see https://thephp.cc/news/2016/02/questioning-phpunit-best-practices

Looking good, thanks.

+++ b/src/ExporterInterface.php
@@ -41,6 +41,8 @@ interface ExporterInterface {
+   * @throws \InvalidArgumentException if any UUID is not found.

Nitpick: We usually move this explanation into the next line, but this can be fixed on commit of course :)

For @andypost to eyeball

Thanx for path! Commited for #2691085: Schedule alpha 9 release