org.apache.cassandra.db.DirectoriesTest(testStandardDirs) unit test failing

patch by mkjellman, reviewed by jasobrown for CASSANDRA-13231
diff --git a/test/unit/org/apache/cassandra/db/DirectoriesTest.java b/test/unit/org/apache/cassandra/db/DirectoriesTest.java
index 008e343..bc5b7bf 100644
--- a/test/unit/org/apache/cassandra/db/DirectoriesTest.java
+++ b/test/unit/org/apache/cassandra/db/DirectoriesTest.java
@@ -137,7 +137,7 @@
     }
 
     @Test
-    public void testStandardDirs()
+    public void testStandardDirs() throws IOException
     {
         for (CFMetaData cfm : CFM)
         {
@@ -146,10 +146,10 @@
 
             Descriptor desc = new Descriptor(cfDir(cfm), KS, cfm.cfName, 1, Descriptor.Type.FINAL);
             File snapshotDir = new File(cfDir(cfm),  File.separator + Directories.SNAPSHOT_SUBDIR + File.separator + "42");
-            assertEquals(snapshotDir, Directories.getSnapshotDirectory(desc, "42"));
+            assertEquals(snapshotDir.getCanonicalFile(), Directories.getSnapshotDirectory(desc, "42"));
 
             File backupsDir = new File(cfDir(cfm),  File.separator + Directories.BACKUPS_SUBDIR);
-            assertEquals(backupsDir, Directories.getBackupsDirectory(desc));
+            assertEquals(backupsDir.getCanonicalFile(), Directories.getBackupsDirectory(desc));
         }
     }