diff --git a/src/hooks/useImportWizard.test.ts b/src/hooks/useImportWizard.test.ts
index 11f66cc..05f0a3b 100644
--- a/src/hooks/useImportWizard.test.ts
+++ b/src/hooks/useImportWizard.test.ts
@@ -24,6 +24,9 @@ vi.mock("../services/db", () => {
 
 import { readFileSync } from "fs";
 import { resolve } from "path";
+import i18next from "i18next";
+import fr from "../i18n/locales/fr.json";
+import en from "../i18n/locales/en.json";
 import {
   wizardReducer,
   initialWizardState,
@@ -271,6 +274,35 @@ describe("sampleFolderError — the refusals of create_sample_import_folders (#3
     expect(sampleFolderError("invalid_date")).toEqual({ key: "import.empty.sampleErrors.invalidDate" });
   });
 
+  it("the real messages name the folder, in French and in English, as the banner renders them", async () => {
+    // The tests of the page take the marked `t`, and the key guard (#453)
+    // compares no value: only the real locale files, through a real i18next
+    // with the app's options, prove the `{{name}}` of the message.
+    const i18n = i18next.createInstance();
+    await i18n.init({
+      resources: { fr: { translation: fr }, en: { translation: en } },
+      lng: "fr",
+      fallbackLng: "en",
+      interpolation: { escapeValue: false },
+    });
+    for (const lng of ["fr", "en"]) {
+      const t = i18n.getFixedT(lng);
+      for (const name of ["Exemple Desjardins", "Exemple Tangerine"]) {
+        const error = sampleFolderError(`sample_folder_exists:${name}`)!;
+        // ImportPage: t(state.error, { ...errorValues, defaultValue: state.error }).
+        const text = t(error.key, { ...error.values, defaultValue: error.key });
+        expect(text, `${lng} ${name}`).toContain(name);
+        expect(text, `${lng} ${name}`).not.toContain("{{");
+      }
+      for (const code of ["import_folder_missing", "invalid_date"]) {
+        const error = sampleFolderError(code)!;
+        const text = t(error.key, { defaultValue: error.key });
+        expect(text, `${lng} ${code}`).not.toBe(error.key);
+        expect(text, `${lng} ${code}`).not.toContain("{{");
+      }
+    }
+  });
+
   it("any other message is unknown, so the banner shows it raw", () => {
     for (const raw of [
       "Cannot write Exemple Desjardins/releve-2026-09.csv: Permission denied (os error 13)",