def test_regression_14818():
    from IPython.core import inputtransformer2 as ipt2
    from textwrap import dedent

    def indent(text, prefix='    '):
        """Indents a block of text"""
        return prefix + text.replace('\n', '\n' + prefix)

    targets = {}
    targets['two_statements'] = dedent(
        """
        x = 1
        print(x)
        """
    ).strip()
    targets['aligned_comment_and_two_statements'] = dedent(
        """
        # This is a comment
        x = 1
        print(x)
        """
    ).strip()
    targets['misaligned_comment_and_two_statements'] = dedent(
        """
            # This is a misaligned comment
        x = 1
        print(x)
        """
    ).strip()

    # Check that all of the targets are valid python
    for target_name, target_code in targets.items():
        exec(target_code, {}, {})

    # Modify the target text to test that ipt2.leading_indent can undo the
    # modifications.
    cases = []
    for target_name, target_code in targets.items():
        cases.append({
            'name': target_name + '_space',
            'sample': indent(target_code, prefix='    '),
            'target': target_code,
        })
        cases.append({
            'name': target_name + '_tab',
            'sample': indent(target_code, prefix='\t'),
            'target': target_code,
        })

    for case in cases:
        case_name = case['name']
        lines = case['sample'].splitlines(keepends=True)
        recon_lines = ipt2.leading_indent(lines)
        reconstructed = ''.join(recon_lines)
        assert reconstructed == case['target'], f'failed case {case_name}'