Update server dependencies; fix invocation in 'make test'

* update mongoose, jest and nodemon to address security alerts triggered
  by dependabot
* 'test' target had a bug introduced by using wrong syntax
* renamed server scripts to clarify the distinction between invocations
  in local development, CI and actual operations

Makefile

@@ -80,7 +80,7 @@ run-db: | $(LOG_DIR)/ $(DATA_DIR)/
 run-local: export PATH := $(BIN_DIR):$(PATH)
 run-local: build
 	cd $(MKFILE_DIR)/app/server \
-	&& npm start
+	&& npm run start:dev
 
 
 .PHONY: test
@@ -90,10 +90,11 @@ test:
 	cd $(MKFILE_DIR)/app/client \
 	&& npm run test
 	cd $(MKFILE_DIR)/app/server \
-	PORT=3002 \
-    MONGODB_URL=mongodb://localhost:27017/$(randomString) \
-    JWT_SECRET=$(randomString) \
-	&& npm run test
+	&& \
+		PORT=3002 \
+		MONGODB_URL=mongodb://localhost:27017/$(randomString) \
+		JWT_SECRET=$(randomString) \
+	 	npm run test
 
 
 .PHONY: test-client-local

app/server/package.json

 {
-  "name": "add-todo-server",
+  "name": "todo-app-server",
   "version": "1.0.0",
   "main": "index.js",
   "license": "MIT",
   "scripts": {
-    "start": "env-cmd -f ./dev.env nodemon src/index.js",
-    "test": "jest --ci",
+    "start": "node src/index.js",
+    "start:dev": "env-cmd -f ./dev.env nodemon src/index.js",
+    "test": "jest --ci --detectOpenHandles",
     "test:dev": "env-cmd -f ./dev.env jest"
   },
   "devDependencies": {
-    "@shelf/jest-mongodb": "^1.1.5",
     "env-cmd": "^10.1.0",
-    "jest": "^25.1.0",
-    "nodemon": "^2.0.2"
+    "jest": "^26.4.2",
+    "nodemon": "^2.0.4"
   },
   "dependencies": {
     "bcryptjs": "^2.4.3",
@@ -21,7 +21,7 @@
     "express": "^4.17.1",
     "helmet": "^3.22.0",
     "jsonwebtoken": "^8.5.1",
-    "mongoose": "^5.9.7",
+    "mongoose": "^5.10.7",
     "validator": "^13.0.0"
   },
   "engines": {

app/server/src/db/mongo.js

 const mongoose = require('mongoose');
 
 
+// utilize event emitter to indicate connection retries in logs
+// DOCS: https://mongoosejs.com/docs/connections.html#connection-events
+const CONNECTION_EVENTS = [
+    'connecting', 'connected', 'disconnecting', 'disconnected',
+    'close', 'reconnectFailed', 'reconnected', 'error'
+]
+
+if( process.env.NODE_ENV === 'production' ){
+    CONNECTION_EVENTS.forEach(( eventName )=>{
+        return mongoose.connection.on( eventName, ()=>{
+            console.log( `Connection state changed to: ${ eventName }` );
+        });
+    });
+}
+
+
 const mongooseInstance_ = mongoose.connect(
     process.env.MONGODB_URL,
     {
@@ -11,18 +27,18 @@ const mongooseInstance_ = mongoose.connect(
         useUnifiedTopology: true,
         heartbeatFrequencyMS: 1000 * 5,         // 1 sec * 5
         serverSelectionTimeoutMS: 1000 * 10     // 1 sec * 10
-    },
-    // TODO: make use of the event emitter to indicate each retry in logs & to increase
-    //       the overall timeout to 10 min (see https://mongoosejs.com/docs/connections.html#connection-events)
-    function( err ){
-        if( typeof err !== 'undefined' && err !== null ){
-            console.error( new Error( `Cannot connect to database: ${ process.env.MONGODB_URL }` ) );
-        }else{
-            console.log( `Connect established to database: ${ process.env.MONGODB_URL }` );
-        }
     }
 );
 
+mongooseInstance_
+    .then(()=>{
+        console.log( `Connect established to database: ${ process.env.MONGODB_URL }` );
+    })
+    .catch(( err )=>{
+        console.error( `Cannot connect to database: ${ process.env.MONGODB_URL }` );
+    });
+
+
 process.on( 'exit', async ()=>{
     const dbClient = await mongooseInstance_;
     dbClient.disconnect();

app/server/src/index.js

@@ -50,6 +50,10 @@ app.use(errorRoutes);
                 __ful();
             }).on( 'error', rej__);
         });
+
+        process.on( 'SIGINT', ()=>{
+            process.exit( 2 );
+        });
     }catch( err ){
         console.error( err );
         process.exit( 1 );