diff --git a/tests/LocaleManagerTest.php b/tests/LocaleManagerTest.php
index 2808362..0e88239 100644
--- a/tests/LocaleManagerTest.php
+++ b/tests/LocaleManagerTest.php
@@ -86,4 +86,15 @@ class LocaleManagerTest extends TestCase
         $this->localeManager->unsetLocale();
         $this->assertNull($this->localeManager->getLocale());
     }
+
+    /**
+     * Test that the environment is correctly set up.
+     *
+     * @return void
+     */
+    public function testEnv()
+    {
+        $this->localeManager->setLocale(new Locale('foo_BAR'));
+        $this->assertEquals('foo_BAR', getenv('LANG'));
+    }
 }
diff --git a/tests/LocaleMiddlewareTest.php b/tests/LocaleMiddlewareTest.php
index 2b85619..0db9f9f 100644
--- a/tests/LocaleMiddlewareTest.php
+++ b/tests/LocaleMiddlewareTest.php
@@ -131,14 +131,4 @@ class LocaleMiddlewareTest extends TestCase
             [$this, 'assertNoHeader']
         );
     }
-
-    /**
-     * Test that the environment is correctly set up.
-     *
-     * @return void
-     */
-    public function testEnv()
-    {
-        $this->markTestIncomplete('We need to find a way to reliably test LC_ALL and LANG values');
-    }
 }