You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_buffers.rb
    path of file: ./repos/textbringer/test/textbringer/commands
    
    the code of the file until where you have to start completion: require_relative "../../test_helper"

class TestBuffers < Textbringer::TestCase
  def test_forward_char
    insert("hello world")
    
  def test_back_to_indentation
    buffer = Buffer.current
    insert(<<EOF)
int
main()
{
    if (1) {
	if (0) {
\t    return 0;
EOF
    buffer.backward_line
    assert_equal(6, buffer.current_line)
    assert_equal(1, buffer.current_column)
    back_to_indentation
    assert_equal(6, buffer.current_line)
    assert_equal(6, buffer.current_column)
    backward_char(3)
    back_to_indentation
    assert_equal(6, buffer.current_line)
    assert_equal(6, buffer.current_column)
    end_of_line
    back_to_indentation
    assert_equal(6, buffer.current_line)
    assert_equal(6, buffer.current_column)
    forward_char(3)
    back_to_indentation
    assert_equal(6, buffer.current_line)
    assert_equal(6, buffer.current_column)
    end_of_buffer
    back_to_indentation
    assert_equal(7, buffer.current_line)
    assert_equal(1, buffer.current_column)
  end