Add tests and fix docker files

test/key-generators/dictionary.test.ts

@@ -0,0 +1,24 @@
+import Generator from '../../src/lib/key-generators/dictionary'
+
+jest.mock('fs', () => ({
+    readFile: jest.fn().mockImplementation((_, a, callback) =>
+          callback(null, 'cat'),
+        )
+  }))
+  
+describe('DictionaryGenerator', () => {
+  describe('options', () => {
+    it('should throw an error if given no options or path', () => {
+      expect(() => new Generator({ type: '' })).toThrow()
+    })
+  })
+  describe('generation', () => {
+    it('should return a key of the proper number of words from the given dictionary', () => {
+      const path = '/tmp/haste-server-test-dictionary'
+
+      const gen = new Generator({ path, type: '' })
+
+      expect(gen.createKey(3)).toEqual('catcatcat')
+    })
+  })
+})