Adding promoting to owner

backend/src/repositories/workspaceRepository.test.ts

@@ -415,6 +415,57 @@ test('updateWorkspaceMemberRole does not let a non-billing owner change the bill
   assert.equal(member, null);
 });
 
+test('updateWorkspaceMemberRole lets the billing owner promote a non-owner to owner', async () => {
+  const { calls } = mockDb({
+    rowCount: 1,
+    rows: [
+      {
+        id: 'member-1',
+        workspace_id: 42,
+        user_id: 'user-2',
+        invite_email: 'helper@example.com',
+        name: 'Helper',
+        role: 'owner',
+        accepted_at: '2026-04-14T00:00:00.000Z',
+        created_at: '2026-04-14T00:00:00.000Z',
+      },
+    ],
+  });
+
+  const member = await updateWorkspaceMemberRole({
+    memberId: 'member-1',
+    workspaceId: 42,
+    role: 'owner',
+    requesterMemberId: 'billing-owner',
+    requesterIsBillingOwner: true,
+    requesterRole: 'owner',
+    billingEmail: 'billing@example.com',
+  });
+
+  assert.equal(member?.role, 'owner');
+  assert.deepEqual(calls[0].params, ['member-1', 42, 'owner', true, 'billing-owner', 'billing@example.com', 'owner']);
+  assert.match(calls[0].text, /\$3 <> 'owner'/);
+});
+
+test('updateWorkspaceMemberRole does not let a non-billing owner promote a member to owner', async () => {
+  mockDb({
+    rowCount: 0,
+    rows: [],
+  });
+
+  const member = await updateWorkspaceMemberRole({
+    memberId: 'member-1',
+    workspaceId: 42,
+    role: 'owner',
+    requesterMemberId: 'non-billing-owner',
+    requesterIsBillingOwner: false,
+    requesterRole: 'owner',
+    billingEmail: 'billing@example.com',
+  });
+
+  assert.equal(member, null);
+});
+
 test('deleteWorkspaceMember removes non-owner members without billing owner access', async () => {
   const { calls } = mockDb({
     rowCount: 1,