Patrick Logan on Lobste.rs comes to mind. He talks a lot about using Smalltalk for robust applications. Here's one paper he shared where Smalltalk team killed the others in productivity. Unfortunately, I didn't get defect rates on all the teams where Ada or C++ were usually winning in those kinds of comparisons.
He said they mostly just test everything at the interfaces. However, it's simplicity also allowed for powerful tools in code generation, refactoring especially, and so on.
https://drive.google.com/file/d/0B0cKsRm-3yprYTR5YTRaRFBfR28...
He said they mostly just test everything at the interfaces. However, it's simplicity also allowed for powerful tools in code generation, refactoring especially, and so on.