diff --git a/bolt/unittests/Profile/DataAggregator.cpp b/bolt/unittests/Profile/DataAggregator.cpp
--- a/bolt/unittests/Profile/DataAggregator.cpp
+++ b/bolt/unittests/Profile/DataAggregator.cpp
@@ -41,11 +41,14 @@
 
   StringRef AllValidBuildIDs = "0000 File0\n"
                                "1111 File1\n"
-                               "2222 File2\n";
+                               "2222 File2\n"
+                               "333  File3\n";
   DA.setParsingBuffer(AllValidBuildIDs);
   ASSERT_TRUE(DA.hasAllBuildIDs());
   FileName = DA.getFileNameForBuildID("1234");
   ASSERT_FALSE(FileName);
   FileName = DA.getFileNameForBuildID("2222");
   ASSERT_EQ(*FileName, "File2");
+  FileName = DA.getFileNameForBuildID("333");
+  ASSERT_EQ(*FileName, "File3");
 }