Setup tests (#87)

* test: move timeout tests to their own job to speed things up slightly

* test: add comment about timeout tests

* test: fix needs in cd job

* test: add jest configuration and first test

* test: setup codecov to track coverage

.github/codecov.yml

@@ -0,0 +1,7 @@
+# see https://docs.codecov.com/docs/codecovyml-reference
+codecov:
+  require_ci_to_pass: false
+comment:
+  layout: 'diff, flags'
+  behavior: default
+  require_changes: true