ww: recursive DIR/... package discovery for ww test

cmd/ww/main.c

@@ -32,6 +32,7 @@ static const char *usage =
 "    foo.ww          literal file\n"
 "    foo             search cwd, -I dirs, then $WW_LIB for foo.ww or foo/foo.ww\n"
 "    lib/foo         directory: build lib/foo/foo.ww\n"
+"    lib/...         every package under lib, recursively (test only)\n"
 "    .               build the cwd's <basename>.ww\n";
 
 static char *self_dir;	/* directory containing this binary */
@@ -1689,6 +1690,29 @@ do_test(int argc, char **argv)
 		fprintf(stderr, "ww test: -S needs -o\n");
 		return 2;
 	}
+	/* Go's ./... form: a trailing "..." element is a package-tree
+	 * request for the coordinator, never a literal path — recognized
+	 * before stat, with the directory-mode rejects. */
+	size_t tlen = strlen(target);
+	if (strcmp(target, "...") == 0 ||
+	    (tlen >= 4 && strcmp(target + tlen - 4, "/...") == 0)) {
+		if (outstem[0]) {
+			fprintf(stderr,
+			    "ww test: -c/-S/-o need a single test file\n");
+			return 2;
+		}
+		if (workdir[0]) {
+			fprintf(stderr,
+			    "ww test: -w needs a single test file\n");
+			return 2;
+		}
+		if (pattern) {
+			fprintf(stderr,
+			    "ww test: pattern needs a single test file\n");
+			return 2;
+		}
+		return exec_package_tests(argc, argv, src, NULL, 0);
+	}
 	struct stat st;
 	if (stat(target, &st) != 0) {
 		/* not a literal path — try module resolution and run as