chore: add test for error handling

packages/postgrest-swr/tests/mutate/use-update-mutation.integration.spec.tsx

@@ -99,6 +99,67 @@ describe('useUpdateMutation', () => {
     await screen.findByText('success: true', {}, { timeout: 10000 });
   });
 
+  it('should return an error', async () => {
+    const USERNAME_1 = `${testRunPrefix}-2`;
+    const USERNAME_2 = `${testRunPrefix}-3`;
+    function Page() {
+      const { data, count } = useQuery(
+        client
+          .from('contact')
+          .select('id,username', { count: 'exact' })
+          .in('username', [USERNAME_1, USERNAME_2]),
+        {
+          revalidateOnFocus: false,
+          revalidateOnReconnect: false,
+        },
+      );
+      const { trigger: insert } = useInsertMutation(client.from('contact'), [
+        'id',
+      ]);
+      const { trigger: update, error } = useUpdateMutation(
+        client.from('contact'),
+        ['id'],
+        'idonotexist',
+      );
+      return (
+        <div>
+          <div
+            data-testid="insert"
+            onClick={async () => await insert([{ username: USERNAME_1 }])}
+          />
+          <div
+            data-testid="update"
+            onClick={async () =>
+              await update({
+                id: (data ?? []).find((d) => d.username === USERNAME_1)?.id,
+                username: USERNAME_2,
+              })
+            }
+          />
+          <span>
+            {
+              data?.find((d) =>
+                [USERNAME_1, USERNAME_2].includes(d.username ?? ''),
+              )?.username
+            }
+          </span>
+          <span data-testid="count">{`count: ${count}`}</span>
+          <span data-testid="error">{`error: ${!!error}`}</span>
+        </div>
+      );
+    }
+
+    renderWithConfig(<Page />, { provider: () => provider });
+    await screen.findByText('count: 0', {}, { timeout: 10000 });
+
+    fireEvent.click(screen.getByTestId('insert'));
+    await screen.findByText(USERNAME_1, {}, { timeout: 10000 });
+    expect(screen.getByTestId('count').textContent).toEqual('count: 1');
+
+    fireEvent.click(screen.getByTestId('update'));
+    await screen.findByText('error: true', {}, { timeout: 10000 });
+  });
+
   it('should update existing cache item', async () => {
     const USERNAME_1 = `${testRunPrefix}-2`;
     const USERNAME_2 = `${testRunPrefix}-3`;