diff --git a/tests/Doctrine/ODM/MongoDB/Tests/Functional/AtomicSetTest.php b/tests/Doctrine/ODM/MongoDB/Tests/Functional/AtomicSetTest.php
index 214c1e2ff8..da7e9e5104 100644
--- a/tests/Doctrine/ODM/MongoDB/Tests/Functional/AtomicSetTest.php
+++ b/tests/Doctrine/ODM/MongoDB/Tests/Functional/AtomicSetTest.php
@@ -453,6 +453,7 @@ public function testReplacementOfEmbedManyElements()
         $firstChapter->name = 'First chapter A';
 
         // Developers commonly attempt to replace the contents of an EmbedMany with a new ArrayCollection like this:
+        /** @var ArrayCollection<int, Chapter> $replacementChapters */
         $replacementChapters = new ArrayCollection();
         $replacementChapters->add($firstChapter);
         $replacementChapters->add(new Chapter('Second chapter B'));
@@ -478,9 +479,10 @@ public function testReplacementOfIdentifiedEmbedManyElements()
         $this->dm->flush();
         $this->dm->clear();
 
-        $book                = $this->dm->getRepository(Book::CLASSNAME)->findOneBy(['_id' => $book->id]);
-        $firstChapter        = $book->identifiedChapters->first();
-        $firstChapter->name  = 'First chapter A';
+        $book               = $this->dm->getRepository(Book::CLASSNAME)->findOneBy(['_id' => $book->id]);
+        $firstChapter       = $book->identifiedChapters->first();
+        $firstChapter->name = 'First chapter A';
+        /** @var ArrayCollection<int, IdentifiedChapter> $replacementChapters */
         $replacementChapters = new ArrayCollection();
         $replacementChapters->add($firstChapter);
         $replacementChapters->add(new IdentifiedChapter('Second chapter B'));
diff --git a/tests/Doctrine/ODM/MongoDB/Tests/Functional/EmbeddedTest.php b/tests/Doctrine/ODM/MongoDB/Tests/Functional/EmbeddedTest.php
index 39cdc11ed1..8e1b9b54b8 100644
--- a/tests/Doctrine/ODM/MongoDB/Tests/Functional/EmbeddedTest.php
+++ b/tests/Doctrine/ODM/MongoDB/Tests/Functional/EmbeddedTest.php
@@ -5,6 +5,7 @@
 namespace Doctrine\ODM\MongoDB\Tests\Functional;
 
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
 use Doctrine\ODM\MongoDB\PersistentCollection;
 use Doctrine\ODM\MongoDB\Tests\BaseTest;
@@ -560,6 +561,8 @@ public function testWhenCopyingManyEmbedSubDocumentsFromOneDocumentToAnotherWill
         $this->dm->persist($test1);
         $this->dm->flush();
 
+        assert($test1->embedMany instanceof Collection);
+
         $test2            = new ChangeEmbeddedIdTest();
         $test2->embedMany = $test1->embedMany; //using clone will work
         $this->dm->persist($test2);
@@ -642,10 +645,18 @@ class ChangeEmbeddedIdTest
     /** @ODM\Id */
     public $id;
 
-    /** @ODM\EmbedOne(targetDocument=EmbeddedDocumentWithId::class) */
+    /**
+     * @ODM\EmbedOne(targetDocument=EmbeddedDocumentWithId::class)
+     *
+     * @var EmbeddedDocumentWithId|null
+     */
     public $embed;
 
-    /** @ODM\EmbedMany(targetDocument=EmbeddedDocumentWithId::class) */
+    /**
+     * @ODM\EmbedMany(targetDocument=EmbeddedDocumentWithId::class)
+     *
+     * @var Collection<int, EmbeddedDocumentWithId>|array<EmbeddedDocumentWithId>
+     */
     public $embedMany;
 
     public function __construct()
diff --git a/tests/Doctrine/ODM/MongoDB/Tests/Functional/ReferenceEmbeddedDocumentsTest.php b/tests/Doctrine/ODM/MongoDB/Tests/Functional/ReferenceEmbeddedDocumentsTest.php
index 9a899a9207..0ac50c0aad 100644
--- a/tests/Doctrine/ODM/MongoDB/Tests/Functional/ReferenceEmbeddedDocumentsTest.php
+++ b/tests/Doctrine/ODM/MongoDB/Tests/Functional/ReferenceEmbeddedDocumentsTest.php
@@ -22,6 +22,7 @@ public function testSavesEmbeddedDocumentsInReferencedDocument()
 
         $project = $this->dm->find(Project::class, $project->getId());
 
+        /** @var ArrayCollection<int, SubProject> $subProjects */
         $subProjects = new ArrayCollection();
         $subProject1 = new SubProject('Sub Project #1');
         $subProject2 = new SubProject('Sub Project #2');
diff --git a/tests/Doctrine/ODM/MongoDB/Tests/Functional/Ticket/GH1011Test.php b/tests/Doctrine/ODM/MongoDB/Tests/Functional/Ticket/GH1011Test.php
index c861c7c019..14c7ef60e7 100644
--- a/tests/Doctrine/ODM/MongoDB/Tests/Functional/Ticket/GH1011Test.php
+++ b/tests/Doctrine/ODM/MongoDB/Tests/Functional/Ticket/GH1011Test.php
@@ -5,6 +5,7 @@
 namespace Doctrine\ODM\MongoDB\Tests\Functional\Ticket;
 
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
 use Doctrine\ODM\MongoDB\PersistentCollection\PersistentCollectionInterface;
 use Doctrine\ODM\MongoDB\Tests\BaseTest;
@@ -20,6 +21,7 @@ public function testClearCollection()
         $doc->embeds->clear();
         $doc->embeds->add(new GH1011Embedded('test2'));
         $this->uow->computeChangeSets();
+        $this->assertInstanceOf(PersistentCollectionInterface::class, $doc->embeds);
         $this->assertTrue($this->uow->isCollectionScheduledForUpdate($doc->embeds));
         $this->assertFalse($this->uow->isCollectionScheduledForDeletion($doc->embeds));
     }
@@ -47,7 +49,11 @@ class GH1011Document
     /** @ODM\Id */
     public $id;
 
-    /** @ODM\EmbedMany(targetDocument=GH1011Embedded::class, strategy="set") */
+    /**
+     * @ODM\EmbedMany(targetDocument=GH1011Embedded::class, strategy="set")
+     *
+     * @var Collection<int, GH1011Embedded>
+     */
     public $embeds;
 
     public function __construct()
diff --git a/tests/Documents/Book.php b/tests/Documents/Book.php
index e5d87a33bd..c6459f2893 100644
--- a/tests/Documents/Book.php
+++ b/tests/Documents/Book.php
@@ -5,6 +5,7 @@
 namespace Documents;
 
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
 
 /** @ODM\Document */
@@ -18,10 +19,18 @@ class Book
     /** @ODM\Field(type="int") @ODM\Version */
     public $version = 1;
 
-    /** @ODM\EmbedMany(targetDocument=Chapter::class, strategy="atomicSet") */
+    /**
+     * @ODM\EmbedMany(targetDocument=Chapter::class, strategy="atomicSet")
+     *
+     * @var Collection<int, Chapter>
+     */
     public $chapters;
 
-    /** @ODM\EmbedMany(targetDocument=IdentifiedChapter::class, strategy="atomicSet") */
+    /**
+     * @ODM\EmbedMany(targetDocument=IdentifiedChapter::class, strategy="atomicSet")
+     *
+     * @var Collection<int, IdentifiedChapter>
+     */
     public $identifiedChapters;
 
     public function __construct()
diff --git a/tests/Documents/IdentifiedChapter.php b/tests/Documents/IdentifiedChapter.php
index d14623cc66..b9697da1ac 100644
--- a/tests/Documents/IdentifiedChapter.php
+++ b/tests/Documents/IdentifiedChapter.php
@@ -5,6 +5,7 @@
 namespace Documents;
 
 use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ODM\MongoDB\Mapping\Annotations as ODM;
 
 /** @ODM\EmbeddedDocument */
@@ -16,7 +17,11 @@ class IdentifiedChapter
     /** @ODM\Field(type="string") */
     public $name;
 
-    /** @ODM\EmbedMany(targetDocument=Page::class) */
+    /**
+     * @ODM\EmbedMany(targetDocument=Page::class)
+     *
+     * @var Collection<int, Page>
+     */
     public $pages;
 
     public function __construct($name = null)
diff --git a/tests/Documents/Project.php b/tests/Documents/Project.php
index a019879e96..374e0ece5a 100644
--- a/tests/Documents/Project.php
+++ b/tests/Documents/Project.php
@@ -22,16 +22,27 @@ class Project
     /** @ODM\Field(type="string") */
     private $name;
 
-    /** @ODM\EmbedOne(targetDocument=Address::class) */
+    /**
+     * @ODM\EmbedOne(targetDocument=Address::class)
+     *
+     * @var Address|null
+     */
     private $address;
 
-    /** @ODM\ReferenceMany(targetDocument=SubProject::class, cascade="all") */
+    /**
+     * @ODM\ReferenceMany(targetDocument=SubProject::class, cascade="all")
+     *
+     * @var Collection<int, SubProject>
+     */
     private $subProjects;
 
-    public function __construct($name, ?Collection $subProjects = null)
+    /**
+     * @param Collection<int, SubProject>|null $subProjects
+     */
+    public function __construct(string $name, ?Collection $subProjects = null)
     {
         $this->name        = $name;
-        $this->subProjects = $subProjects ? $subProjects : new ArrayCollection();
+        $this->subProjects = $subProjects ?? new ArrayCollection();
     }
 
     public function getId()
@@ -59,11 +70,17 @@ public function getAddress()
         return $this->address;
     }
 
+    /**
+     * @param Collection<int, SubProject> $subProjects
+     */
     public function setSubProjects(Collection $subProjects)
     {
         $this->subProjects = $subProjects;
     }
 
+    /**
+     * @return Collection<int, SubProject>
+     */
     public function getSubProjects()
     {
         return $this->subProjects;
diff --git a/tests/Documents/SubProject.php b/tests/Documents/SubProject.php
index 847542cbfb..f45f9fe114 100644
--- a/tests/Documents/SubProject.php
+++ b/tests/Documents/SubProject.php
@@ -10,14 +10,24 @@
 /** @ODM\Document */
 class SubProject extends Project
 {
-    /** @ODM\EmbedMany(targetDocument=Issue::class) */
+    /**
+     * @ODM\EmbedMany(targetDocument=Issue::class)
+     *
+     * @var Collection<int, Issue>
+     */
     private $issues;
 
+    /**
+     * @return Collection<int, Issue>
+     */
     public function getIssues()
     {
         return $this->issues;
     }
 
+    /**
+     * @param Collection<int, Issue> $issues
+     */
     public function setIssues(Collection $issues)
     {
         $this->issues = $issues;