Make empty key to always be prefix in prefix_map

1 files changed, 5 insertions, 7 deletions

diff --git a/tests/build/prefix-map/driver.cxx b/tests/build/prefix-map/driver.cxx
index fb5269c..77edb6c 100644
--- a/tests/build/prefix-map/driver.cxx
+++ b/tests/build/prefix-map/driver.cxx
@@ -35,7 +35,8 @@ main ()
 
     {
       auto r (m.find (""));
-      assert (r.first == r.second);
+      assert (r.first != r.second && r.first->second == 1 &&
+              ++r.first == r.second);
     }
 
     {
@@ -70,7 +71,9 @@ main ()
 
     {
       auto r (m.find (""));
-      assert (r.first == r.second);
+      assert (r.first != r.second && r.first->second == 2 &&
+              ++r.first != r.second && r.first->second == 1 &&
+              ++r.first == r.second);
     }
 
     {
@@ -114,11 +117,6 @@ main ()
       '.');
 
     {
-      auto r (m.find (""));
-      assert (r.first == r.second);
-    }
-
-    {
       auto r (m.find ("fo"));
       assert (r.first == r.second);
     }