Fix number ranges after tenant import

backend/tests/tenantImportNumberRanges.test.ts

@@ -0,0 +1,48 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+
+import { restoreImportedTenantNumberRanges } from "../src/utils/tenantImportNumberRanges"
+
+test("restores number ranges when importing into an existing target tenant", async () => {
+    const queries: { query: string, values: unknown[] }[] = []
+    const numberRanges = {
+        invoices: { prefix: "RE-", suffix: "", nextNumber: 4712 },
+    }
+    const client = {
+        async query(query: string, values: unknown[]) {
+            queries.push({ query, values })
+            return { rowCount: 1 }
+        },
+    }
+
+    const updated = await restoreImportedTenantNumberRanges(client, {
+        tenantId: 42,
+        tables: {
+            tenants: [{ id: 42, name: "Zieltenant", numberRanges }],
+        },
+    })
+
+    assert.equal(updated, 1)
+    assert.deepEqual(queries, [{
+        query: `update "tenants" set "numberRanges" = $1::jsonb where "id" = $2`,
+        values: [JSON.stringify(numberRanges), 42],
+    }])
+})
+
+test("does not overwrite number ranges when the export contains none", async () => {
+    let queryCalled = false
+    const client = {
+        async query() {
+            queryCalled = true
+            return { rowCount: 1 }
+        },
+    }
+
+    const updated = await restoreImportedTenantNumberRanges(client, {
+        tenantId: 42,
+        tables: { tenants: [{ id: 42, name: "Zieltenant" }] },
+    })
+
+    assert.equal(updated, 0)
+    assert.equal(queryCalled, false)
+})