diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -209,6 +209,7 @@
     'PhutilLexerSyntaxHighlighter' => 'markup/syntax/highlighter/PhutilLexerSyntaxHighlighter.php',
     'PhutilLibraryConflictException' => 'moduleutils/PhutilLibraryConflictException.php',
     'PhutilLibraryMapBuilder' => 'moduleutils/PhutilLibraryMapBuilder.php',
+    'PhutilLibraryTestCase' => '__tests__/PhutilLibraryTestCase.php',
     'PhutilLipsumContextFreeGrammar' => 'grammar/PhutilLipsumContextFreeGrammar.php',
     'PhutilLock' => 'filesystem/PhutilLock.php',
     'PhutilLockException' => 'filesystem/PhutilLockException.php',
@@ -605,7 +606,7 @@
     'PhutilIPAddress' => 'Phobject',
     'PhutilIPAddressTestCase' => 'PhutilTestCase',
     'PhutilInRequestKeyValueCache' => 'PhutilKeyValueCache',
-    'PhutilInfrastructureTestCase' => 'PhutilTestCase',
+    'PhutilInfrastructureTestCase' => 'PhutilLibraryTestCase',
     'PhutilInvalidRuleParserGeneratorException' => 'PhutilParserGeneratorException',
     'PhutilIrreducibleRuleParserGeneratorException' => 'PhutilParserGeneratorException',
     'PhutilJIRAAuthAdapter' => 'PhutilOAuth1AuthAdapter',
@@ -624,6 +625,7 @@
     'PhutilLanguageGuesserTestCase' => 'PhutilTestCase',
     'PhutilLexerSyntaxHighlighter' => 'PhutilSyntaxHighlighter',
     'PhutilLibraryConflictException' => 'Exception',
+    'PhutilLibraryTestCase' => 'PhutilTestCase',
     'PhutilLipsumContextFreeGrammar' => 'PhutilContextFreeGrammar',
     'PhutilLockException' => 'Exception',
     'PhutilLogFileChannel' => 'PhutilChannelChannel',
diff --git a/src/__tests__/PhutilInfrastructureTestCase.php b/src/__tests__/PhutilInfrastructureTestCase.php
--- a/src/__tests__/PhutilInfrastructureTestCase.php
+++ b/src/__tests__/PhutilInfrastructureTestCase.php
@@ -1,37 +1,3 @@
 <?php
 
-final class PhutilInfrastructureTestCase extends PhutilTestCase {
-
-  /**
-   * This is more of an acceptance test case instead of a unit test. It verifies
-   * that all symbols can be loaded correctly. It can catch problems like
-   * missing methods in descendants of abstract base classes.
-   */
-  public function testEverythingImplemented() {
-    id(new PhutilSymbolLoader())->selectAndLoadSymbols();
-    $this->assertTrue(true);
-  }
-
-  /**
-   * This is more of an acceptance test case instead of a unit test. It verifies
-   * that all the library map is up-to-date.
-   */
-  public function testLibraryMap() {
-    $library = phutil_get_current_library_name();
-    $root = phutil_get_library_root($library);
-
-    $new_library_map = id(new PhutilLibraryMapBuilder($root))
-      ->buildMap();
-
-    $bootloader = PhutilBootloader::getInstance();
-    $old_library_map = $bootloader->getLibraryMapWithoutExtensions($library);
-    unset($old_library_map[PhutilLibraryMapBuilder::LIBRARY_MAP_VERSION_KEY]);
-
-    $this->assertEqual(
-      $new_library_map,
-      $old_library_map,
-      'The library map does not appear to be up-to-date. Try '.
-      'rebuilding the map with `arc liberate`.');
-  }
-
-}
+final class PhutilInfrastructureTestCase extends PhutilLibraryTestCase {}
diff --git a/src/__tests__/PhutilInfrastructureTestCase.php b/src/__tests__/PhutilLibraryTestCase.php
copy from src/__tests__/PhutilInfrastructureTestCase.php
copy to src/__tests__/PhutilLibraryTestCase.php
--- a/src/__tests__/PhutilInfrastructureTestCase.php
+++ b/src/__tests__/PhutilLibraryTestCase.php
@@ -1,6 +1,6 @@
 <?php
 
-final class PhutilInfrastructureTestCase extends PhutilTestCase {
+abstract class PhutilLibraryTestCase extends PhutilTestCase {
 
   /**
    * This is more of an acceptance test case instead of a unit test. It verifies
@@ -17,8 +17,8 @@
    * that all the library map is up-to-date.
    */
   public function testLibraryMap() {
-    $library = phutil_get_current_library_name();
-    $root = phutil_get_library_root($library);
+    $root = $this->getLibraryRoot();
+    $library = phutil_get_library_name_for_root($root);
 
     $new_library_map = id(new PhutilLibraryMapBuilder($root))
       ->buildMap();
@@ -30,8 +30,18 @@
     $this->assertEqual(
       $new_library_map,
       $old_library_map,
-      'The library map does not appear to be up-to-date. Try '.
-      'rebuilding the map with `arc liberate`.');
+      pht(
+        'The library map does not appear to be up-to-date. Try '.
+        'rebuilding the map with `%s`.',
+        'arc liberate'));
+  }
+
+  /**
+   * Get the root directory for the library currently being tested.
+   */
+  protected function getLibraryRoot() {
+    $caller = idx(debug_backtrace(), 2);
+    return phutil_get_library_root_for_path($caller['file']);
   }
 
 }