Zentralen BIC-Abgleich robust machen

backend/tests/bankingInstitution.test.ts

@@ -0,0 +1,18 @@
+import test from "node:test"
+import assert from "node:assert/strict"
+
+import { findBankInstitutionByBic } from "../src/modules/banking-institution"
+
+test("finds a banking institution by BIC case-insensitively", () => {
+    const institution = findBankInstitutionByBic([
+        { id: "without-bic" },
+        { id: "slz", bic: "slzode22xxx" },
+    ], " SLZODE22XXX ")
+
+    assert.equal(institution?.id, "slz")
+})
+
+test("ignores institutions without a BIC instead of throwing", () => {
+    assert.equal(findBankInstitutionByBic([{ id: "without-bic" }], "SLZODE22XXX"), null)
+    assert.equal(findBankInstitutionByBic(null, "SLZODE22XXX"), null)
+})