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

backend/internal/service/openai_gateway_service_session_isolation_test.go

@@ -0,0 +1,50 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsolateOpenAISessionID(t *testing.T) {
+	t.Run("empty_raw_returns_empty", func(t *testing.T) {
+		assert.Equal(t, "", isolateOpenAISessionID(1, ""))
+		assert.Equal(t, "", isolateOpenAISessionID(1, "   "))
+	})
+
+	t.Run("deterministic", func(t *testing.T) {
+		a := isolateOpenAISessionID(42, "sess_abc123")
+		b := isolateOpenAISessionID(42, "sess_abc123")
+		assert.Equal(t, a, b)
+	})
+
+	t.Run("different_apiKeyID_different_result", func(t *testing.T) {
+		a := isolateOpenAISessionID(1, "same_session")
+		b := isolateOpenAISessionID(2, "same_session")
+		require.NotEqual(t, a, b, "不同 API Key 使用相同 session_id 应产生不同隔离值")
+	})
+
+	t.Run("different_raw_different_result", func(t *testing.T) {
+		a := isolateOpenAISessionID(1, "session_a")
+		b := isolateOpenAISessionID(1, "session_b")
+		require.NotEqual(t, a, b)
+	})
+
+	t.Run("format_is_16_hex_chars", func(t *testing.T) {
+		result := isolateOpenAISessionID(99, "test_session")
+		assert.Len(t, result, 16, "应为 16 字符的 hex 字符串")
+		for _, ch := range result {
+			assert.True(t, (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f'),
+				"应仅包含 hex 字符: %c", ch)
+		}
+	})
+
+	t.Run("zero_apiKeyID_still_works", func(t *testing.T) {
+		result := isolateOpenAISessionID(0, "session")
+		assert.NotEmpty(t, result)
+		// apiKeyID=0 与 apiKeyID=1 应产生不同结果
+		other := isolateOpenAISessionID(1, "session")
+		assert.NotEqual(t, result, other)
+	})
+}