diff --git a/PediFoodsUITests/CartCheckoutFlowTests.swift b/PediFoodsUITests/CartCheckoutFlowTests.swift
index 77efe88..d13cd86 100644
--- a/PediFoodsUITests/CartCheckoutFlowTests.swift
+++ b/PediFoodsUITests/CartCheckoutFlowTests.swift
@@ -6,6 +6,45 @@ import XCTest
 /// so Home shows a real store list - see
 /// decisions/2026-08-06-ui-test-account-and-app-attest-bypass.md.
 final class CartCheckoutFlowTests: XCTestCase {
+    /// The cart is on-device state (`CartState`/`SessionStateStore`, see
+    /// `AppState.swift`), not server-side - it persists across app
+    /// relaunches on this simulator just like the login session (see
+    /// decisions/2026-09-11-ui-test-shared-login-session.md), and keeps
+    /// accumulating real quantities across every manual and automated run
+    /// against the "MARIBA" test store. There's no direct "empty cart" UI
+    /// action - the "Trocar de loja?" alert's "Limpar carrinho e
+    /// adicionar" (`StoreDetailView.swift`) only fires for a genuinely
+    /// different store (`shouldAskForStoreSwitch`,
+    /// `StoreDetailView+Logic.swift`), which this suite never triggers
+    /// since every test targets the same store. So: drain the cart via
+    /// its own per-item "minus" control, once per class (not once per
+    /// test - each drain can take several taps), so every run starts from
+    /// a known-empty cart instead of an ever-growing one.
+    override class func setUp() {
+        super.setUp()
+        let app = XCUIApplication()
+        app.launch()
+        app.ensureLoggedIn()
+
+        let cartTab = app.images.matching(identifier: "cart.fill").firstMatch
+        guard cartTab.waitForExistence(timeout: 10) else { return }
+        cartTab.tap()
+        guard app.staticTexts["Meu Carrinho"].waitForExistence(timeout: 10) else { return }
+
+        // No "set quantity" input exists in CartView - only per-tap
+        // increment/decrement - so draining is inherently one tap per
+        // unit. Capped rather than unbounded so a genuinely stuck cart
+        // fails fast instead of hanging the whole class.
+        let minusButton = app.images.matching(identifier: "minus").firstMatch
+        var remainingTaps = 500
+        while app.staticTexts["Seu carrinho está vazio"].exists == false, remainingTaps > 0 {
+            guard minusButton.waitForExistence(timeout: 3) else { break }
+            minusButton.tap()
+            usleep(150_000)
+            remainingTaps -= 1
+        }
+    }
+
     override func setUpWithError() throws {
         continueAfterFailure = false
     }