Run EUnit on all Erlang files in a directory. The tasks.json file is used to build+test with VSCode using Ctrl+Shift+B (Cmd+Shift+B on Mac).

run_tests.erl

#!/usr/bin/env escript

main([]) -> 
    {ok, Filenames} = file:list_dir("."),
    [run_eunit(File) || File <- Filenames, string:right(File,10) == "_tests.erl", File =/= "run_tests.erl" ],
    erlang:halt(0).

run_eunit(File) ->
    compile:file(File),
    Module = list_to_atom(filename:basename(File, ".erl")),
    io:format("Testing ~-12s", [Module]),
    eunit:test(Module).

tasks.json

{
    "version": "0.1.0",
    "command": "escript",
    "isShellCommand": false,
    "args": ["run_tests.erl"],
    "showOutput": "always"
}

VSCode output

Testing assignment1   All 5 tests passed.
Testing cut           All 4 tests passed.
Testing fac           2 tests passed.
Testing fib           All 3 tests passed.
Testing first         Test passed.
Testing listfunc      All 7 tests passed.
Testing second        There were no tests to run.
Testing third         All 3 tests passed.