diff --git a/composer.json b/composer.json
index 67d565e..82bd660 100644
--- a/composer.json
+++ b/composer.json
@@ -17,5 +17,11 @@
     },
     "autoload": {
         "psr-4": {"Doctrine\\Deprecations\\": "lib/Doctrine/Deprecations"}
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "DeprecationTests\\": "tests/fixtures/src",
+            "Doctrine\\Foo\\": "tests/fixtures/vendor/doctrine/foo"
+        }
     }
 }
diff --git a/lib/Doctrine/Deprecations/Deprecation.php b/lib/Doctrine/Deprecations/Deprecation.php
index f2894d0..cdc8e0d 100644
--- a/lib/Doctrine/Deprecations/Deprecation.php
+++ b/lib/Doctrine/Deprecations/Deprecation.php
@@ -108,8 +108,10 @@ public static function triggerIfCalledFromOutside(string $package, string $link,
         // dependency and the caller is not a file in that package.
         // When $package is installed as a root package, then this deprecation
         // is always ignored
-        if (strpos($backtrace[0]['file'], '/vendor/' . $package . '/') === false &&
-            strpos($backtrace[1]['file'], '/tests/') !== false) {
+        if (
+            strpos($backtrace[0]['file'], '/vendor/' . $package . '/') === false &&
+            strpos($backtrace[1]['file'], '/tests/') !== false
+        ) {
             return;
         }
 
diff --git a/tests/Doctrine/Deprecations/DeprecationTest.php b/tests/Doctrine/Deprecations/DeprecationTest.php
index bc5e0af..2b777a1 100644
--- a/tests/Doctrine/Deprecations/DeprecationTest.php
+++ b/tests/Doctrine/Deprecations/DeprecationTest.php
@@ -4,7 +4,9 @@
 
 namespace Doctrine\Deprecations;
 
+use DeprecationTests\Foo;
 use Doctrine\Deprecations\PHPUnit\VerifyDeprecations;
+use Doctrine\Foo\Baz;
 use PHPUnit\Framework\Error\Deprecated;
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
@@ -185,7 +187,44 @@ public function testDeprecationWithIgnoredPackage(): void
         $this->assertEquals(['https://github.com/doctrine/orm/issue/1234' => 1], Deprecation::getTriggeredDeprecations());
     }
 
-    public function testDeprecationCalledFromOutside(): void
+    public function testDeprecationIfCalledFromOutside(): void
+    {
+        Deprecation::enableWithTriggerError();
+
+        try {
+            Foo::triggerDependencyWithDeprecation();
+
+            $this->fail('Not expected to get here');
+        } catch (Throwable $e) {
+            $this->assertEquals(
+                'Bar::oldFunc() is deprecated, use Bar::newFunc() instead. (Bar.php:16 called by Foo.php:14, https://github.com/doctrine/foo, package doctrine/foo)',
+                $e->getMessage()
+            );
+
+            $this->assertEquals(['https://github.com/doctrine/foo' => 1], Deprecation::getTriggeredDeprecations());
+        }
+    }
+
+    public function testDeprecationIfCalledFromOutsideNotTriggeringFromInside(): void
+    {
+        Deprecation::enableWithTriggerError();
+
+        Foo::triggerDependencyWithDeprecationFromInside();
+
+        $this->assertEquals(0, Deprecation::getUniqueTriggeredDeprecationsCount());
+    }
+
+    public function testDeprecationIfCalledFromOutsideNotTriggeringFromInsideClass(): void
+    {
+        Deprecation::enableWithTriggerError();
+
+        $baz = new Baz();
+        $baz->usingOldFunc();
+
+        $this->assertEquals(0, Deprecation::getUniqueTriggeredDeprecationsCount());
+    }
+
+    public function testDeprecationCalledFromOutsideInRoot(): void
     {
         Deprecation::enableWithTriggerError();
 
diff --git a/tests/fixtures/src/Foo.php b/tests/fixtures/src/Foo.php
new file mode 100644
index 0000000..79e27ae
--- /dev/null
+++ b/tests/fixtures/src/Foo.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DeprecationTests;
+
+use Doctrine\Foo\Bar;
+
+class Foo
+{
+    public function triggerDependencyWithDeprecation(): void
+    {
+        $bar = new Bar();
+        $bar->oldFunc();
+    }
+
+    public function triggerDependencyWithDeprecationFromInside(): void
+    {
+        $bar = new Bar();
+        $bar->newFunc();
+    }
+}
diff --git a/tests/fixtures/vendor/doctrine/foo/Bar.php b/tests/fixtures/vendor/doctrine/foo/Bar.php
new file mode 100644
index 0000000..2a84f1a
--- /dev/null
+++ b/tests/fixtures/vendor/doctrine/foo/Bar.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Foo;
+
+use Doctrine\Deprecations\Deprecation;
+
+class Bar
+{
+    public function oldFunc(): void
+    {
+        Deprecation::triggerIfCalledFromOutside(
+            'doctrine/foo',
+            'https://github.com/doctrine/foo',
+            'Bar::oldFunc() is deprecated, use Bar::newFunc() instead.'
+        );
+    }
+
+    public function newFunc(): void
+    {
+        $this->oldFunc();
+    }
+}
diff --git a/tests/fixtures/vendor/doctrine/foo/Baz.php b/tests/fixtures/vendor/doctrine/foo/Baz.php
new file mode 100644
index 0000000..62b2bb1
--- /dev/null
+++ b/tests/fixtures/vendor/doctrine/foo/Baz.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Foo;
+
+class Baz
+{
+    public function usingOldFunc(): void
+    {
+        $bar = new Bar();
+        $bar->oldFunc();
+    }
+}