fixing jamfile to work with regression tests

[SVN r22440]

string/test/Jamfile

@@ -10,10 +10,13 @@
 subproject libs/algorithm/string/test ;
 
 # bring in rules for testing
-SEARCH on testing.jam = $(BOOST_BUILD_PATH) ;
-include testing.jam ;
+import testing ;
 
-test-suite "string_algo"
+# Make tests run by default.
+DEPENDS all : test ;
+
+{
+	test-suite string_algo
 		: [ run
 				container_test.cpp
 			  : :
@@ -63,6 +66,6 @@ test-suite "string_algo"
 				:   
 				: regex
 			]
-
 		;
+}