1 files changed, 50 insertions, 0 deletions
diff --git a/src/boost/tools/build/test/core_modifiers.py b/src/boost/tools/build/test/core_modifiers.py
new file mode 100644
index 000000000..37cb933a3
--- /dev/null
+++ b/src/boost/tools/build/test/core_modifiers.py
@@ -0,0 +1,50 @@
+#!/usr/bin/python
+
+# Copyright 2003 Vladimir Prus
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)
+
+# This tests the "existing" and "updated" modifiers on actions.
+
+import BoostBuild
+
+t = BoostBuild.Tester(pass_toolset=0)
+
+code = """
+DEPENDS all : a ;
+ALWAYS a ;
+NOTFILE a ;
+
+actions existing make-a
+{
+    echo $(>) > list
+}
+make-a a : a-1 a-2 a-3 ;
+DEPENDS a : a-1 a-2 a-3 ;
+NOCARE a-1 a-2 ;
+
+actions make-a3
+{
+   echo foo > $(<)
+}
+make-a3 a-3 ;
+"""
+
+t.write("file.jam", code)
+t.write("a-1", "")
+
+t.run_build_system(["-ffile.jam"])
+t.fail_test(t.read("list").strip() != "a-1")
+t.rm(["a-3", "list"])
+
+code = code.replace("existing", "updated")
+t.write("file.jam", code)
+t.run_build_system(["-ffile.jam"])
+t.fail_test(t.read("list").strip() != "a-3")
+
+code = code.replace("updated", "existing updated")
+t.write("file.jam", code)
+t.run_build_system(["-ffile.jam"])
+t.fail_test(t.read("list").strip() != "a-1 a-3")
+
+t.cleanup()