diff --git a/src/Symfony/Component/Workflow/composer.json b/src/Symfony/Component/Workflow/composer.json
index eaa9b4607b3f4..6b23eeb31370d 100644
--- a/src/Symfony/Component/Workflow/composer.json
+++ b/src/Symfony/Component/Workflow/composer.json
@@ -34,7 +34,10 @@
         "symfony/event-dispatcher": "<5.4"
     },
     "autoload": {
-        "psr-4": { "Symfony\\Component\\Workflow\\": "" }
+        "psr-4": { "Symfony\\Component\\Workflow\\": "" },
+        "exclude-from-classmap": [
+            "/Tests/"
+        ]
     },
     "minimum-stability": "dev"
 }
diff --git a/src/Symfony/Contracts/HttpClient/composer.json b/src/Symfony/Contracts/HttpClient/composer.json
index 4e877e5264f73..0a99ad5e72bf5 100644
--- a/src/Symfony/Contracts/HttpClient/composer.json
+++ b/src/Symfony/Contracts/HttpClient/composer.json
@@ -22,7 +22,10 @@
         "symfony/http-client-implementation": ""
     },
     "autoload": {
-        "psr-4": { "Symfony\\Contracts\\HttpClient\\": "" }
+        "psr-4": { "Symfony\\Contracts\\HttpClient\\": "" },
+        "exclude-from-classmap": [
+            "/Test/"
+        ]
     },
     "minimum-stability": "dev",
     "extra": {
diff --git a/src/Symfony/Contracts/Service/composer.json b/src/Symfony/Contracts/Service/composer.json
index a4ff0861d5473..e7e4a64df08a4 100644
--- a/src/Symfony/Contracts/Service/composer.json
+++ b/src/Symfony/Contracts/Service/composer.json
@@ -26,7 +26,10 @@
         "symfony/service-implementation": ""
     },
     "autoload": {
-        "psr-4": { "Symfony\\Contracts\\Service\\": "" }
+        "psr-4": { "Symfony\\Contracts\\Service\\": "" },
+        "exclude-from-classmap": [
+            "/Test/"
+        ]
     },
     "minimum-stability": "dev",
     "extra": {
diff --git a/src/Symfony/Contracts/Translation/composer.json b/src/Symfony/Contracts/Translation/composer.json
index d078be8cf7f5b..5240ed0f9d069 100644
--- a/src/Symfony/Contracts/Translation/composer.json
+++ b/src/Symfony/Contracts/Translation/composer.json
@@ -22,7 +22,10 @@
         "symfony/translation-implementation": ""
     },
     "autoload": {
-        "psr-4": { "Symfony\\Contracts\\Translation\\": "" }
+        "psr-4": { "Symfony\\Contracts\\Translation\\": "" },
+        "exclude-from-classmap": [
+            "/Test/"
+        ]
     },
     "minimum-stability": "dev",
     "extra": {