diff --git a/backend/src/repositories/birdRepository.test.ts b/backend/src/repositories/birdRepository.test.ts
index 80b52f1..3d2fb69 100644
--- a/backend/src/repositories/birdRepository.test.ts
+++ b/backend/src/repositories/birdRepository.test.ts
@@ -6,7 +6,10 @@ import {
   createBird,
   createPendingBirdTransfer,
   getBirdById,
+  getOpenBirdTransferCode,
+  getOpenBirdTransferCodeForBird,
   listWeightsForBird,
+  markBirdTransferCodeCompleted,
   transferBirdToWorkspace,
 } from './birdRepository.js';
 import { mockDb } from '../test/mockDb.js';
@@ -198,3 +201,36 @@ test('completePendingBirdTransfersForOwner moves pending birds and marks complet
   assert.deepEqual(calls[2].params, ['transfer-1', 22]);
   assert.match(calls[2].text, /completed_at = CURRENT_TIMESTAMP/);
 });
+
+test('getOpenBirdTransferCode only returns unconsumed codes', async () => {
+  const { calls } = mockDb({ rowCount: 0, rows: [] });
+
+  const transferCode = await getOpenBirdTransferCode('ADOPT-123');
+
+  assert.equal(transferCode, null);
+  assert.deepEqual(calls[0].params, ['ADOPT-123']);
+  assert.match(calls[0].text, /bird_transfer_codes\.completed_at IS NULL/);
+  assert.match(calls[0].text, /bird_transfer_codes\.revoked_at IS NULL/);
+  assert.match(calls[0].text, /birds\.workspace_id = bird_transfer_codes\.source_workspace_id/);
+});
+
+test('getOpenBirdTransferCodeForBird ignores consumed codes', async () => {
+  const { calls } = mockDb({ rowCount: 0, rows: [] });
+
+  const transferCode = await getOpenBirdTransferCodeForBird('bird-1', 10);
+
+  assert.equal(transferCode, null);
+  assert.deepEqual(calls[0].params, ['bird-1', 10]);
+  assert.match(calls[0].text, /completed_at IS NULL/);
+  assert.match(calls[0].text, /revoked_at IS NULL/);
+});
+
+test('markBirdTransferCodeCompleted consumes a code for the receiving workspace', async () => {
+  const { calls } = mockDb({ rowCount: 1, rows: [] });
+
+  await markBirdTransferCodeCompleted('code-1', 22);
+
+  assert.deepEqual(calls[0].params, ['code-1', 22]);
+  assert.match(calls[0].text, /SET completed_at = CURRENT_TIMESTAMP/);
+  assert.match(calls[0].text, /completed_workspace_id = \$2/);
+});