Mostly tests and some small changes (#16)

* Create docker.test.ts
* Add context tests
* test main

__tests__/context.test.ts

@@ -0,0 +1,16 @@
+import osm = require('os');
+
+import {getInputs} from '../src/context';
+
+test('without password getInputs throws errors', async () => {
+  expect(() => {
+    getInputs();
+  }).toThrowError('Input required and not supplied: password');
+});
+
+test('with password getInputs does not error', async () => {
+  process.env['INPUT_PASSWORD'] = 'groundcontrol';
+  expect(() => {
+    getInputs();
+  }).not.toThrowError();
+});