Allow choosing which unit tests to run

Useful for running just one unit test file instead of all.

Now one can pass the name of a unit test (or a list of names)
to the 00_unit_tests.sh script.

Example:
  cd tests
  ./00_unit_tests.sh disassemble  # run only disassemble.py

The default (if nothing is passed the script) is still to run
all tests as before.

Author: wnienhaus

tests/00_unit_tests.sh

@@ -4,7 +4,9 @@
 
 set -e
 
-for file in opcodes assemble link util preprocess definesdb disassemble; do
+LIST=${1:-opcodes assemble link util preprocess definesdb disassemble}
+
+for file in $LIST; do
     echo testing $file...
     micropython $file.py
 done