fill method infrastructure ✓ 100.0%

  fill(wrapper: HTMLElement, _value: string): boolean {
    const lists = wrapper.querySelectorAll<HTMLElement>(".ant-transfer-list");
    if (lists.length < 2) return false;

    const sourceList = lists[0];
    const sourceItems = sourceList.querySelectorAll<HTMLElement>(
      ".ant-transfer-list-content-item:not(.ant-transfer-list-content-item-disabled)",
    );

    if (sourceItems.length === 0) return false;

    // Select a random subset of items (at least 1, up to half)
    const count = Math.max(
      1,
      Math.floor(Math.random() * Math.ceil(sourceItems.length / 2)),
    );
    const indices = new Set<number>();
    while (indices.size < count) {
      indices.add(Math.floor(Math.random() * sourceItems.length));
    }

    // Click each selected item's checkbox
    for (const idx of indices) {
      const checkbox = sourceItems[idx].querySelector<HTMLElement>(
        ".ant-checkbox-wrapper:not(.ant-checkbox-wrapper-checked)",
      );
      if (checkbox) {
        simulateClick(checkbox);
      }
    }

    // Click the "move to target" button (first button in operation area)
    const operationArea = wrapper.querySelector<HTMLElement>(
      ".ant-transfer-operation",
    );
    if (operationArea) {
      const moveBtn = operationArea.querySelector<HTMLButtonElement>(
        "button:not([disabled])",
      );
      if (moveBtn) {
        simulateClick(moveBtn);
        return true;
      }
    }

    return false;
  },