adding the most basic tests to the cli

.gitignore

@@ -1,2 +1,4 @@
 node_modules
 .vscode/
+# ignore codecoverage output
+coverage/

jest.config.js

@@ -1,15 +1,14 @@
 module.exports = {
   globals: {
     "ts-jest": {
-      disableSourceMapSupport: true,
-    },
+      disableSourceMapSupport: true
+    }
   },
   verbose: true,
   transform: {
-    "^.+\\.tsx?$": "ts-jest",
+    "^.+\\.tsx?$": "ts-jest"
   },
   preset: "ts-jest",
-  node: true,
   moduleFileExtensions: ["ts", "tsx", "js", "jsx", "json", "node"],
   testURL: "http://localhost",
   transformIgnorePatterns: ["[/\\\\]node_modules[/\\\\].+\\.(js|jsx)$"],
@@ -18,11 +17,7 @@ module.exports = {
   collectCoverageFrom: [
     "config/**/*.{ts,tsx}",
     "src/**/*.{ts,tsx}",
-    "!src/naptime/**/*",
-  ],
-  coverageDirectory: "./coverage/",
-  watchPlugins: [
-    require.resolve("jest-watch-typeahead/filename"),
-    require.resolve("jest-watch-typeahead/testname"),
+    "!src/naptime/**/*"
   ],
+  coverageDirectory: "./coverage/"
 };

src/__mocks__/aws-sdk/clients/ssm.ts

@@ -0,0 +1,42 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+import { SSM as RealSSM } from 'aws-sdk';
+type SSMMOCKS = Record<string, any>
+let ssmMocks = {} as SSMMOCKS;
+
+type Dispatch = (response: Promise<any>, callback?: Function) => { promise: () => Promise<any> } | any
+const dispatch: Dispatch = (response, callback?: Function) => {
+  if (!callback) {
+    return {
+      promise: () => response,
+    }
+  }
+  return response.then((result: RealSSM.DescribeParametersResult) => callback(null, result)).catch((err: Error) => callback(err, null));
+}
+
+const handleDescribeParameters = async (props: RealSSM.DescribeParametersRequest): Promise<Record<string, any>> => {
+  const [filter] = props.ParameterFilters!;
+
+  if (filter && filter.Key in ssmMocks) {
+    return ssmMocks[filter.Key];
+  } else {
+    return {}
+  }
+};
+
+export default class SSM {
+  static __setResponseForMethods(mock: SSMMOCKS) {
+    ssmMocks = { ...ssmMocks, ...mock };
+  }
+
+  static __showMockedPayloads() {
+    return { ...ssmMocks };
+  }
+
+  describeParameters(props: RealSSM.DescribeParametersRequest, callback?: Function) {
+    const promise = handleDescribeParameters(props);
+
+    return dispatch(promise, callback);
+
+  }
+}