diff --git a/tests/tbs/tb0406.pp b/tests/tbs/tb0406.pp
new file mode 100644
index 0000000000..1078cbcdd7
--- /dev/null
+++ b/tests/tbs/tb0406.pp
@@ -0,0 +1,11 @@
+unit tb0406;
+
+{$ifndef WITH_FULL}
+
+interface
+uses ub0406;
+
+implementation
+
+end.
+{$endif}
diff --git a/tests/tbs/ub0406.pp b/tests/tbs/ub0406.pp
new file mode 100644
index 0000000000..329136844b
--- /dev/null
+++ b/tests/tbs/ub0406.pp
@@ -0,0 +1,7 @@
+unit ub0406;
+interface
+
+implementation
+uses tb0406;
+
+end.