Add tests and fix docker files

test/document-handler/document-handler.test.ts

@@ -0,0 +1,20 @@
+import DocumentHandler from '../../src/lib/document-handler/index'
+import Generator from '../../src/lib/key-generators/random'
+import constants from '../../src/constants'
+
+describe('document-handler', () => {
+  describe('with randomKey', () => {
+    it('should choose a key of the proper length', () => {
+      const gen = new Generator({ type: 'random' })
+      const dh = new DocumentHandler({ keyLength: 6, keyGenerator: gen})
+      expect(dh.acceptableKey()?.length).toEqual(6);
+    })
+
+    it('should choose a default key length', () => {
+      const gen = new Generator({ type: 'random' })
+      const dh = new DocumentHandler({ keyGenerator: gen, maxLength: 1 })
+      expect(dh.keyLength).toEqual(constants.DEFAULT_KEY_LENGTH);
+
+    })
+  })
+})