diff -u b/core/modules/locale/src/Tests/LocaleConfigTranslationTest.php b/core/modules/locale/src/Tests/LocaleConfigTranslationTest.php
--- b/core/modules/locale/src/Tests/LocaleConfigTranslationTest.php
+++ b/core/modules/locale/src/Tests/LocaleConfigTranslationTest.php
@@ -182,7 +182,8 @@
     // Uninstall the module.
     $this->drupalPostForm('admin/modules/uninstall', array('uninstall[image]' => "image"), t('Uninstall'));
     $this->drupalPostForm(NULL, array(), t('Uninstall'));
-
+    // After the uninstall we should reinitialize the languageManager property.
+    $this->languageManager = $this->container->get('language_manager');
     // Ensure that the translated configuration has been removed.
     $override = $this->languageManager->getLanguageConfigOverride('xx', 'image.style.medium');
     $this->assertTrue($override->isNew(), 'Translated configuration for image module removed.');