chore: 初始化 T-001 Go 骨架

main_test.go

@@ -0,0 +1,21 @@
+package main
+
+import "testing"
+
+func TestParseModeAcceptsServerAndDeliver(t *testing.T) {
+	for _, raw := range []string{"server", "deliver"} {
+		mode, err := parseMode(raw)
+		if err != nil {
+			t.Fatalf("parseMode(%q) returned error: %v", raw, err)
+		}
+		if string(mode) != raw {
+			t.Fatalf("parseMode(%q) = %q", raw, mode)
+		}
+	}
+}
+
+func TestParseModeRejectsUnknownMode(t *testing.T) {
+	if _, err := parseMode("worker"); err == nil {
+		t.Fatal("parseMode accepted unknown mode")
+	}
+}