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

backend/internal/service/openai_model_alias_test.go

@@ -0,0 +1,36 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestNormalizeKnownOpenAICodexModel_BareGPT56RoutesToSol(t *testing.T) {
+	tests := map[string]string{
+		"gpt-5.6":            "gpt-5.6-sol",
+		"openai/gpt-5.6":     "gpt-5.6-sol",
+		"gpt5.6":             "gpt-5.6-sol",
+		"gpt-5.6-high":       "gpt-5.6-sol",
+		"gpt-5.6-max":        "gpt-5.6-sol",
+		"gpt-5.6-2026-07-09": "gpt-5.6-sol",
+		"openai/gpt-5.6-max": "gpt-5.6-sol",
+	}
+
+	for input, expected := range tests {
+		t.Run(input, func(t *testing.T) {
+			require.Equal(t, expected, normalizeKnownOpenAICodexModel(input))
+		})
+	}
+}
+
+func TestUsageBillingModelCandidates_BareGPT56IncludesSol(t *testing.T) {
+	require.Equal(t,
+		[]string{"gpt-5.6", "gpt-5.6-sol"},
+		usageBillingModelCandidates("gpt-5.6"),
+	)
+	require.Equal(t,
+		[]string{"openai/gpt-5.6", "gpt-5.6", "gpt-5.6-sol"},
+		usageBillingModelCandidates("openai/gpt-5.6"),
+	)
+}