Redo watch test as a vector of lines instead of a string.

[alysbrooks]

This test is difficult to work with as-is because it's one big string, and deep-diff2 (currently) shows only that two strings differ, and not the substrings in particular that cause the mismatch.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (043308e) 75.08% compared to head (0e9a7e3) 75.08%. Report is 7 commits behind head on main.

:exclamation: Current head 0e9a7e3 differs from pull request most recent head 99f96f5. Consider uploading reports for the commit 99f96f5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #411 +/- ## ======================================= Coverage 75.08% 75.08% ======================================= Files 52 52 Lines 2802 2802 Branches 289 289 ======================================= Hits 2104 2104 Misses 511 511 Partials 187 187 ``` | Flag | Coverage Δ | | |---|---|---| | integration | `56.31% <ø> (ø)` | | | unit | `69.41% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#carryforward-flags-in-the-pull-request-comment) to find out more.

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