Using 'eg' where you mean 'eq' is the first problem.
The second problem is that you're looking for exactly "testpoint\n", but in your question you told us that the line you want to stop on is "?testpoint?\n" (I assumed the \n since you're not chomping). Notice the '?' symbols? 'eq' tests for equality. Equality is not just the existance of certain text within a string, but the existance thereof to the exclusion of anything else.
Later in your post, you show example text without the '?' symbols. Which is it? You do have to be specific when you're using 'eq'. There could also be trailing whitespace not visually apparent after 'testpoint', which could be throwing off 'eq'.
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