Register all of /tests/src/ for class loading

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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Attached patch against Drupal 10.1.x

Patch #7 is not applied for Drupal 10.1.x so Inter-diff file is not added.

Checking patch core/lib/Drupal/Core/Test/TestDiscovery.php...
error: while searching for:
$this->testNamespaces["Drupal\\$name\\Tests\\"][] = "$base_path/src/Tests";

// Add PHPUnit test namespaces.
$this->testNamespaces["Drupal\\Tests\\$name\\Unit\\"][] = "$base_path/tests/src/Unit";
$this->testNamespaces["Drupal\\Tests\\$name\\Kernel\\"][] = "$base_path/tests/src/Kernel";
$this->testNamespaces["Drupal\\Tests\\$name\\Functional\\"][] = "$base_path/tests/src/Functional";
$this->testNamespaces["Drupal\\Tests\\$name\\Build\\"][] = "$base_path/tests/src/Build";
$this->testNamespaces["Drupal\\Tests\\$name\\FunctionalJavascript\\"][] = "$base_path/tests/src/FunctionalJavascript";

// Add discovery for traits which are shared between different test
// suites.
$this->testNamespaces["Drupal\\Tests\\$name\\Traits\\"][] = "$base_path/tests/src/Traits";
}

foreach ($this->testNamespaces as $prefix => $paths) {

error: patch failed: core/lib/Drupal/Core/Test/TestDiscovery.php:102
error: core/lib/Drupal/Core/Test/TestDiscovery.php: patch does not apply
Checking patch core/tests/bootstrap.php...
Hunk #1 succeeded at 79 (offset -1 lines).
Hunk #2 succeeded at 87 (offset -1 lines).

Needs work per #7/ #3

I've tested the patch in #11 on Drupal 10.2 and confirmed that this fixes the issue with test classes being unable to find a helper class under tests/src/Helper within a module test directory, as described in the steps to reproduce. Similarly I've verified this for theme and profile test directories.

What additional work is needed for core test locations (#7), and could this be split to another issue so the existing fix for modules, themes and profiles can be RTBC?

I don't actually think we can do much about the core namespaces, because they sit directly under \Drupal and we don't want to go looking in core/tests/Drupal for non-test Drupal code.

Converted #11 to an MR, inlined a variable for readability, and updated the IS with the proposed solution.

Hiding patches.

Seems to have a test failure.

Just needed rebase.

Sweet. Change didn’t break anything

Committed/pushed to 11.x and cherry-picked to 10.3.x, thanks!

catch → closed merge request !6870

Automatically closed - issue fixed for 2 weeks with no activity.