diff --git a/tests/phpunit/includes/GlobalFunctions/wfWikiIDTest.php b/tests/phpunit/includes/GlobalFunctions/wfWikiIDTest.php
deleted file mode 100644
index d3cba0d28cb..00000000000
--- a/tests/phpunit/includes/GlobalFunctions/wfWikiIDTest.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-/**
- * @group GlobalFunctions
- * @covers ::wfWikiID
- */
-class WfWikiId extends MediaWikiTestCase {
-
-	public function testReturnsProperDbName() {
-		$this->setMwGlobals( 'wgDBname', 'known_db_name' );
-		$this->assertEquals('known_db_name',  wfWikiID() );
-	}
-
-	public function testHonorsDatabasePrefix() {
-		$this->setMwGlobals( array(
-			'wgDBname'   => 'known_db_name',
-			'wgDBprefix' => 'prefix',
-		));
-		# Note: prefix is actually a suffix in wfWikiID()
-		$this->assertEquals('known_db_name-prefix',  wfWikiID() );
-	}
-
-}