Bee Smalltalk is an impressive self-hosting Smalltalk implementation! https://esug.org/data/ESUG2014/IWST/Papers/iwst2014_Design and implementation of Bee Smalltalk Runtime.pdf
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Sometimes programming tools are so good that you miss them when using other languages. I see these mentioned the most frequently:
* IntelliJ (for Java)
* Slime+Emacs (for Common Lisp)
* Pharo (for Smalltalk)
I'm struck that they all have bespoke UIs.
"Example Driven Development" using Glamorous and Pharo Smalltalk: https://medium.com/feenk/an-example-of-example-driven-development-4dea0d995920
Tests returning values and composing is a really interesting model. It establishes structure and shows which test failure is the most 'fundamental'.
I've been experimenting with an 'evaluate up to cursor' mode for my PL project.
I love evaluating self-contained snippets in Lisp, this generalises the idea.
The interpreter remembers the arguments when you run tests, then can re-use them when you say 'eval up to here'.
What do you think?