test: refactor unit tests with solc downloader #532

All 188 tests pass in 0s

1 files ±0 24 suites ±0 0s ⏱️ ±0s
188 tests ±0 188 ✅ ±0 0 💤 ±0 0 ❌ ±0
208 runs ±0 208 ✅ ±0 0 💤 ±0 0 ❌ ±0

Results for commit 6bf9943. ± Comparison against earlier commit 973bc52.