Refactor tests and bump TS version (#1475)

* initial commit, WIP

* Refactoring tests into multiple files; moving away from macros

* More test refactor & fix

* revert ts-node API changes so that this branch is fully dedicated to test refactor

* upgrade deps as needed

* try improving flaky test

* lint-fix

* Replacing more chai with expect; WIP fixing timing issues in REPL tests

* Attempted fix

* Fix?

* fix test flakiness

Author: cspotcode

ava.config.js

@@ -0,0 +1,8 @@
+export default {
+  files: ['dist/test/**/*.spec.js'],
+  failWithoutAssertions: false,
+  environmentVariables: {
+    ts_node_install_lock: `id-${Math.floor(Math.random() * 10e9)}`,
+  },
+  timeout: '300s',
+};