Regres: Recursively load chunked mustpass lists

tests/regres/testlist/testlist.go

@@ -50,13 +50,22 @@ type Group struct {
 
 // Load loads the test list file and appends all tests to the Group.
 func (g *Group) Load() error {
-	tests, err := ioutil.ReadFile(g.File)
+	return g.LoadFile(g.File)
+}
+
+func (g *Group) LoadFile(file string) error {
+	dir, _ := filepath.Split(file)
+	tests, err := ioutil.ReadFile(file)
 	if err != nil {
-		return cause.Wrap(err, "Couldn't read '%s'", tests)
+		return cause.Wrap(err, "Couldn't read '%s'", file)
 	}
 	for _, line := range strings.Split(string(tests), "\n") {
 		line = strings.TrimSpace(line)
-		if line != "" && !strings.HasPrefix(line, "#") {
+		// The test list file can contain references to other .txt files
+		// containing the individual tests.
+		if strings.HasSuffix(line, ".txt") {
+			g.LoadFile(filepath.Join(dir, line))
+		} else if line != "" && !strings.HasPrefix(line, "#") {
 			g.Tests = append(g.Tests, line)
 		}
 	}