Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_pages/atdc/5.md

@@ -28,7 +28,7 @@ Instead of making HTTP requests and checking the responses, we can test the resu
 
 Let's create a new test that uses the `PostNodeRepository` to find the nodes and assert we get an expected number returned.
 
-```php
+```language-php
 <?php
 
 namespace Drupal\Tests\atdc\Kernel;
@@ -73,7 +73,7 @@ It's defined within `atdc.services.yml`, but we need to be explicit about which
 
 Create a `$modules` array within the test class and add `atdc`:
 
-```php
+```language-php
 protected static $modules = ['atdc'];
 ```
 
@@ -83,7 +83,7 @@ Run the tests again, and you should get a different error:
 
 As well as `atdc`, you must enable the `node` module. You can do so by adding it to the `$modules` array:
 
-```php
+```language-php
 protected static $modules = ['node', 'atdc'];
 ```
 
@@ -111,7 +111,7 @@ Within the test, you can use `$this->createNode()` to create posts.
 
 Create the three posts the test is expecting:
 
-```php
+```language-php
 // Arrange.
 $this->createNode(['type' => 'post']);
 $this->createNode(['type' => 'post']);
@@ -126,7 +126,7 @@ Next, let's assert they're returned in a specific order.
 
 Update the posts to have a specific title and created date so we can specify which order we expect them to be returned in and which titles they should have:
 
-```php
+```language-php
 // Arrange.
 $this->createNode([
   'created' => (new DrupalDateTime('-1 week'))->getTimestamp(),
@@ -151,7 +151,7 @@ Note we're intentionally setting them to be in an incorrect order, to begin with
 
 Next, assert that the titles are returned in the correct order.
 
-```php
+```language-php
 self::assertSame(
   ['Post two', 'Post one', 'Post three'],
   array_map(
@@ -165,7 +165,7 @@ For each node in `$nodes`, get its label (title) and compare them with the title
 
 As expected, the test fails:
 
-```plain
+```language-plain
 1) Drupal\Tests\atdc\Kernel\PostNodeRepositoryTest::testPostsAreReturnedByCreatedDate
 Failed asserting that two arrays are identical.
 --- Expected
@@ -187,7 +187,7 @@ We need to update the code within `PostNodeRepository` to fix the ordering.
 
 After loading the nodes, we need to sort them.
 
-```php
+```language-php
 public function findAll(): array {
   $nodeStorage = $this->entityTypeManager->getStorage('node');
   $nodes = $nodeStorage->loadMultiple();
@@ -206,7 +206,7 @@ This gets us further, but the test is still failing.
 
 Whilst the order is correct, the array keys don't match what we expect:
 
-```plain
+```language-plain
 1) Drupal\Tests\atdc\Kernel\PostNodeRepositoryTest::testPostsAreReturnedByCreatedDate
 Failed asserting that two arrays are identical.
 --- Expected
@@ -233,7 +233,7 @@ And, because the correct titles are still being shown, our original Functional t
 
 Tip: to see the names of the tests in your output, add the `--testdox` flag to the `phpunit` command:
 
-```plain
+```language-plain
 Blog Page (Drupal\Tests\atdc\Functional\BlogPage)
  ✔ Blog page
  ✔ Posts are visible