fix: correctly respect logging option (#2013)

* test: update to using jest for unit tests

* remove mocha types

* revert to using mocha for testrunner.ts

* add logger unit testing

* fix reftest previewer scaling

* fix LoggerOptions to interface

* fix linting

jest.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    preset: 'ts-jest',
+    testEnvironment: 'jsdom',
+    roots: ['src']
+};