Add upstream test suite with runner

[klette]

This will not pass for a while :-)

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.32%.

Quality metrics	Before	After	Change
Complexity	5.30 ⭐	5.30 ⭐	0.00
Method Length	35.50 ⭐	35.31 ⭐	-0.19 👍
Working memory	8.61 🙂	8.50 🙂	-0.11 👍
Quality	73.03% 🙂	73.35% 🙂	0.32% 👍

Other metrics	Before	After	Change
Lines	156	156	0

Changed files	Quality Before	Quality After	Quality Change
sanity_html/renderer.py	64.86% 🙂	64.86% 🙂	0.00%
tests/test_rendering.py	95.47% ⭐	96.68% ⭐	1.21% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
sanity_html/renderer.py	SanityBlockRenderer._render_list	11 🙂	154 😞	15 😞	44.01% 😞	Try splitting into smaller methods. Extract out complex expressions
sanity_html/renderer.py	SanityBlockRenderer._render_node	6 ⭐	65 🙂	10 😞	68.19% 🙂	Extract out complex expressions

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it by mentioning @sourcery-ai in a comment.