```ruby
require "bar_of_progress/version"

class BarOfProgress
  def initialize
    @complete = 100.0
  end

  def progress(amount = 0)
    bubbles = ((amount / @complete) * 10)
    full_bubbles = bubbles.floor
    partial_bubbles = bubbles % 1 == 0 ? 0 : 1
    "[#{'●' * full_bubbles}#{'◍' * partial_bubbles}#{'◌' * (10 - full_bubbles - partial_bubbles)}]"
  end
end
```

Fix failing boundary tests by applying boundaries
user
```ruby
require "bar_of_progress/version"

class BarOfProgress
  def initialize
    @complete = 100.0
  end

  def progress(amount = 0)
    bubbles = betwixt(((amount / @complete) * 10), 0, 10)
    full_bubbles = bubbles.floor
    partial_bubbles = bubbles % 1 == 0 ? 0 : 1
    "[#{chars('●', full_bubbles)}#{chars('◍', partial_bubbles)}#{chars('◌', (10 - full_bubbles - partial_bubbles))}]"
  end

private

  # This method is amazing.
  def betwixt(n, min, max)
    [[n, min].max, max].min
  end

  def chars(char, n)
    return "" if n <= 0
    char * n
  end
end
```
assistant