test: migrate tests from mocha to jest (#181)

Author: john-u

.circleci/config.yml

@@ -35,9 +35,10 @@ jobs:
           paths:
             - node_modules
           key: v1-dependencies-{{ checksum "package.json" }}
+      - run: npm run lint
       - run: npm test
       - codecov/upload:
-          file: .nyc_output/*.json
+          file: coverage/*.json
       - *persist_to_workspace
   publish:
     executor: daneel

.vscode/launch.json

@@ -1,33 +1,18 @@
 {
     "version": "0.2.0",
     "configurations": [
-      {
-          "type": "node",
-          "request": "launch",
-          "name": "Mocha All",
-          "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-          "args": [
-              "--timeout",
-              "999999",
-              "--colors",
-              "${workspaceFolder}/test"
-          ],
-          "console": "integratedTerminal",
-          "internalConsoleOptions": "neverOpen"
-      },
-      {
-          "type": "node",
-          "request": "launch",
-          "name": "Mocha Current File",
-          "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
-          "args": [
-              "--timeout",
-              "999999",
-              "--colors",
-              "${file}"
-          ],
-          "console": "integratedTerminal",
-          "internalConsoleOptions": "neverOpen"
-      }
-    ]
+	  {
+		"name": "Debug Jest Tests",
+		"type": "node",
+		"request": "launch",
+		"runtimeArgs": [
+		  "--inspect-brk",
+		  "${workspaceRoot}/node_modules/.bin/jest",
+		  "--runInBand"
+		],
+		"console": "integratedTerminal",
+		"internalConsoleOptions": "neverOpen",
+		"port": 9229
+	  }
+	]
   }

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+	// Currently unable to set coverage reporter watermarks in jest. See https://github.com/facebook/jest/issues/9734
+	//
+	// For our previous nyc watermark config, see
+	// https://github.com/SmartThingsCommunity/smartapp-sdk-nodejs/blob/79983de15646dd3be84d2b3e82d409f9bc632959/package.json#L72
+	coverageReporters: ['json', 'text'],
+	testEnvironment: 'node',
+	testMatch: ['**/test/**/*.[jt]s?(x)']
+}