diff --git a/ui/index.js b/ui/index.js
index d6a077d..7de6560 100644
--- a/ui/index.js
+++ b/ui/index.js
@@ -64,16 +64,26 @@ function createUiRouter({ auth, MOCK_USERS, authLimiter }) {
       const canAdminMode = !!(iamAdmin && activeClientId === ADMIN_CLIENT_ID)
         || (isNail && activeClientId === ADMIN_CLIENT_ID);
       const sessionIsImpersonated = req.session && req.session.user && req.session.user.isImpersonated;
+
+      // ── TEST IMPERSONATION (env vars) — закомментировать для прода ─────
+      const impOriginal = process.env.IMPERSONATION_ORIGINAL || '';
+      const impTarget   = process.env.IMPERSONATION_TARGET   || '';
+      const impCompany  = process.env.IMPERSONATION_COMPANY  || '';
+      const email = req.session?.user?.email || payload.email || payload.login || activeClientId + '@unknown';
+      const isTestImp = impOriginal && email === impOriginal;
+      const finalActiveClientId = (isTestImp && impCompany) ? impCompany : activeClientId;
+      // ── /TEST IMPERSONATION ─────────────────────────────────────────────
+
       req.user = {
         clientId:       rawClientId,
         allClientIds,
-        activeClientId,
+        activeClientId: finalActiveClientId,
         companyId:      payload.company_id   || payload.companyId   || null,
-        companyName:    payload.company_name  || payload.companyName || activeClientId,
-        email:          req.session?.user?.email || payload.email || payload.login || activeClientId + '@unknown',
+        companyName:    payload.company_name  || payload.companyName || finalActiveClientId,
+        email:          (isTestImp && impTarget) ? impTarget : email,
         isAdmin:        iamAdmin || isNail,
-        isImpersonated: !!sessionIsImpersonated,
-        originalUserEmail:    req.session?.user?.originalUserEmail || '',
+        isImpersonated: !!sessionIsImpersonated || isTestImp,
+        originalUserEmail:    req.session?.user?.originalUserEmail || (isTestImp ? impOriginal : ''),
         originalUserFullName: req.session?.user?.originalUserFullName || '',
         canAdminMode,
         adminMode:      !!(req.session && req.session.adminMode),