diff --git a/frontend/components/AdminOverlay.tsx b/frontend/components/AdminOverlay.tsx
index 597cd8e9..d3fd7865 100644
--- a/frontend/components/AdminOverlay.tsx
+++ b/frontend/components/AdminOverlay.tsx
@@ -113,7 +113,7 @@ export default function AdminOverlay({
         loading={confirmState.loading}
         dangerLevel={confirmState.affectedCount && confirmState.affectedCount > 10 ? 'high' : 'medium'}
       />
-      <div className="fixed inset-0 z-50 bg-background/60 animate-in fade-in duration-300">
+      <div data-testid="admin-overlay" className="fixed inset-0 z-50 bg-background/60 animate-in fade-in duration-300">
       <div className="absolute inset-y-0 right-0 w-full max-w-md sm:max-w-lg md:max-w-md bg-surface border-l border-slate-800 shadow-2xl flex flex-col animate-in slide-in-from-right duration-500">
         <div className="p-6 border-b border-slate-800 flex items-center justify-between">
           <div className="flex items-center gap-3">
@@ -123,6 +123,7 @@ export default function AdminOverlay({
             <h2 className="text-xl font-black text-white">System Admin</h2>
           </div>
           <button
+            data-testid="close-admin-overlay"
             onClick={onClose}
             className="p-2 hover:bg-slate-800 rounded-full transition-colors text-muted focus-visible:ring-2 focus-visible:ring-primary focus-visible:outline-none"
             aria-label="Close"
diff --git a/frontend/components/IdentityCheckOverlay.tsx b/frontend/components/IdentityCheckOverlay.tsx
index f3fe2e5e..9d826e82 100644
--- a/frontend/components/IdentityCheckOverlay.tsx
+++ b/frontend/components/IdentityCheckOverlay.tsx
@@ -60,7 +60,7 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
   };
 
   return (
-    <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-background/90 animate-in fade-in duration-500">
+    <div data-testid="identity-check-overlay" className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-background/90 animate-in fade-in duration-500">
       <div className="bg-surface border border-slate-800 rounded-[2.5rem] p-8 sm:p-10 max-w-sm w-full shadow-2xl space-y-8 animate-in zoom-in-95 duration-300 relative overflow-hidden">
         
         <div className="text-center space-y-3">
@@ -71,12 +71,13 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
           <p className="text-muted text-xs font-black">Select operator profile to initialize</p>
         </div>
         
-        <div className="grid gap-3.5">
+        <div data-testid="user-list" className="grid gap-3.5">
           {!selectedUserForLogin && !isEnterprise ? (
             <>
               {users.map(user => (
                 <button
                   key={user.id}
+                  data-testid="user-list-item"
                   onClick={() => handleSelectUser(user)}
                   className="bg-slate-800/40 hover:bg-slate-800 border border-slate-800/50 hover:border-primary/40 p-5 rounded-[1.5rem] text-left transition-all group flex items-center justify-between shadow-sm active:scale-[0.98]"
                 >
@@ -108,7 +109,8 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
             <div className="space-y-5 animate-in slide-in-from-bottom-5 duration-300">
                <div className="flex justify-between items-center px-1">
                  <p className="text-xs font-black text-secondary italic">LDAP Authentication</p>
-                 <button 
+                 <button
+                   data-testid="local-login-tab"
                    onClick={() => setIsEnterprise(false)}
                    className="text-xs font-black text-primary hover:underline tracking-tighter"
                  >
@@ -119,8 +121,9 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
                <div className="space-y-2">
                  <div className="relative group">
                    <User className="absolute left-5 top-1/2 -translate-y-1/2 text-secondary group-focus-within:text-primary transition-colors" size={18} />
-                   <input 
+                   <input
                      ref={enterpriseUserRef}
+                     data-testid="username-input"
                      type="text"
                      autoFocus
                      className="w-full bg-background/50 border border-slate-800/80 focus:border-primary/50 focus:bg-background rounded-[1.25rem] py-4.5 pl-14 pr-5 text-sm text-slate-100 focus:outline-none transition-all placeholder:text-slate-700 font-mono"
@@ -132,8 +135,9 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
                <div className="space-y-2">
                  <div className="relative group">
                    <Lock className="absolute left-5 top-1/2 -translate-y-1/2 text-secondary group-focus-within:text-primary transition-colors" size={18} />
-                   <input 
+                   <input
                      ref={enterprisePassRef}
+                     data-testid="password-input"
                      type="password"
                      onKeyDown={(e) => e.key === 'Enter' && handleLogin()}
                      className="w-full bg-background/50 border border-slate-800/80 focus:border-primary/50 focus:bg-background rounded-[1.25rem] py-4.5 pl-14 pr-5 text-sm text-slate-100 focus:outline-none transition-all placeholder:text-slate-700 font-mono"
@@ -142,7 +146,8 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
                  </div>
                </div>
                
-               <button 
+               <button
+                 data-testid="login-submit"
                  onClick={handleLogin}
                  className="w-full bg-primary text-white font-black py-5 rounded-[1.5rem] shadow-2xl shadow-primary/20 hover:shadow-primary/30 active:scale-95 transition-all text-xs border border-primary/20"
                >
@@ -151,7 +156,7 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
             </div>
           ) : (
             <div className="space-y-5 animate-in slide-in-from-bottom-5 duration-300">
-               <div className="bg-background/50 p-5 rounded-[1.5rem] border border-slate-800 flex items-center justify-between group">
+               <div data-testid="user-display" className="bg-background/50 p-5 rounded-[1.5rem] border border-slate-800 flex items-center justify-between group">
                 <div className="flex items-center gap-4">
                   <div className="w-10 h-10 rounded-2xl bg-primary/10 border border-primary/20 flex items-center justify-center text-primary shadow-lg">
                     <Shield size={20} />
@@ -173,8 +178,9 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
               <div className="space-y-2">
                 <div className="relative group">
                   <Lock className="absolute left-5 top-1/2 -translate-y-1/2 text-secondary group-focus-within:text-primary transition-colors" size={18} />
-                   <input 
+                   <input
                     ref={localPassRef}
+                    data-testid="local-password-input"
                     type="password"
                     autoFocus
                     onKeyDown={(e) => e.key === 'Enter' && handleLogin()}
@@ -184,7 +190,8 @@ const IdentityCheckOverlay = memo(({ show, users, onAuthenticated }: IdentityChe
                 </div>
               </div>
               
-              <button 
+              <button
+                data-testid="local-login-submit"
                 onClick={handleLogin}
                 className="w-full bg-primary text-white font-black py-5 rounded-[1.5rem] shadow-2xl shadow-primary/20 hover:shadow-primary/30 active:scale-95 transition-all text-xs border border-primary/20"
               >