```ruby
require 'test_helper'

class BreakTest < ActiveSupport::TestCase
  def test_breaks_not_colliding
    data = {
      year: 2023,
      period: 'T1',
      start_date: Date.parse('2023-01-01'),
      end_date: Date.parse('2023-02-01'),
      active_until: Date.parse('2023-03-01')
    }

    tp = TeachingPeriod.create(data)

    b1 = tp.add_break('2023-01-02', 1)
    exception = assert_raise(Exception) {tp.add_break('2023-01-03', 1)}
    assert_equal("Validation failed: overlaps another break", exception.message)
    assert b1.valid?, "b1 not valid"
    assert_equal 1, tp.breaks.count
  end
end```

Handle record invalid exception in break add
user
```ruby
require 'test_helper'

class BreakTest < ActiveSupport::TestCase
  def test_breaks_not_colliding
    data = {
      year: 2023,
      period: 'T1',
      start_date: Date.parse('2023-01-01'),
      end_date: Date.parse('2023-02-01'),
      active_until: Date.parse('2023-03-01')
    }

    tp = TeachingPeriod.create(data)

    b1 = tp.add_break('2023-01-02', 1)
    exception = assert_raises(ActiveRecord::RecordInvalid) {tp.add_break('2023-01-03', 1)}
    assert_equal("Validation failed: overlaps another break", exception.message)
    assert b1.valid?, "b1 not valid"
    assert_equal 1, tp.breaks.count
  end
end
```
assistant