add -chatty flag to test.

was supposed to be in some other cl but got dropped.

R=r
DELTA=21  (16 added, 2 deleted, 3 changed)
OCL=19531
CL=19539

src/lib/testing.go

@@ -4,23 +4,37 @@
 
 package testing
 
+import (
+	"flag"
+)
+
+var chatty bool;
+func init() {
+	flag.Bool("chatty", false, &chatty, "chatty");
+}
+
 export type Test struct {
 	name string;
 	f *() bool;
 }
 
 export func Main(tests *[]Test) {
+	flag.Parse();
 	ok := true;
 	for i := 0; i < len(tests); i++ {
+		if chatty {
+			println("=== RUN ", tests[i].name);
+		}
 		ok1 := tests[i].f();
-		status := "FAIL";
-		if ok1 {
-			status = "PASS"
+		if !ok1 {
+			ok = false;
+			println("--- FAIL", tests[i].name);
+		} else if chatty {
+			println("--- PASS", tests[i].name);
 		}
-		ok = ok && ok1;
-		println(status, tests[i].name);
 	}
 	if !ok {
 		sys.exit(1);
 	}
+	println("PASS");
 }