Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/internal/pkg/openai/instructions_test.go

@@ -0,0 +1,47 @@
+package openai
+
+import (
+	"strings"
+	"testing"
+)
+
+func firstLine(s string) string {
+	s = strings.TrimSpace(s)
+	if i := strings.IndexByte(s, '\n'); i >= 0 {
+		return s[:i]
+	}
+	return s
+}
+
+// CodexBaseInstructionsForModel 应按模型返回对应的真实 Codex base prompt。
+func TestCodexBaseInstructionsForModel(t *testing.T) {
+	cases := []struct {
+		model    string
+		wantHead string
+	}{
+		{"gpt-5-codex", "You are Codex, based on GPT-5"},
+		{"gpt-5.3-codex", "You are Codex, based on GPT-5"},
+		{"gpt-5.3-codex-spark", "You are Codex, based on GPT-5"},
+		{"gpt-5.1-codex-max", "You are Codex, based on GPT-5"},
+		{"gpt-5.2-codex", "You are Codex, based on GPT-5"},
+		{"gpt-5.5", "You are Codex, a coding agent based on GPT-5"},
+		{" GPT-5.5 ", "You are Codex, a coding agent based on GPT-5"},
+		{"gpt-5.2", "You are GPT-5.2 running in the Codex CLI"},
+		{"gpt-5.1", "You are GPT-5.1 running in the Codex CLI"},
+		{"gpt-5", "You are Codex, a coding agent based on GPT-5"},   // 回退到最新（GPT-5.5）
+		{"gpt-5.4", "You are Codex, a coding agent based on GPT-5"}, // 未单独维护 → 最新
+		{"gpt-5.3", "You are Codex, a coding agent based on GPT-5"}, // 未单独维护 → 最新
+		{"some-unknown-model", "You are Codex, a coding agent based on GPT-5"},
+		{"", "You are Codex, a coding agent based on GPT-5"}, // 回退到最新
+	}
+	for _, c := range cases {
+		got := strings.TrimSpace(CodexBaseInstructionsForModel(c.model))
+		if got == "" {
+			t.Errorf("model %q: got empty instructions", c.model)
+			continue
+		}
+		if !strings.HasPrefix(got, c.wantHead) {
+			t.Errorf("model %q: got prefix %q, want %q", c.model, firstLine(got), c.wantHead)
+		}
+	}
+}