Added DB-Test

app/server/src/models/Todos.test.js

+const dbClientInstance_ = require( '../db/mongo.js' );
+const { model: Todos } = require( './Todos.js' );
+const mongoose = require('mongoose');
+
+
+describe( 'Todos: Todos', ()=>{
+    beforeAll( async ()=>{
+        try{
+            await dbClientInstance_;
+        }catch( err ){
+            console.warn("Error")
+            console.error( new Error( `Cannot connect to database: ${ process.env.MONGODB_URL }` ) );
+            process.exit( 1 );
+        }
+    });
+
+
+    test( 'creating a todo', async ()=>{
+        
+        console.debug("Creating Todo")
+
+        const todoData = {
+            title: 'Homework',
+            description: 'Devops project 2020',
+            user: mongoose.Types.ObjectId()
+        };
+
+        console.warn("Done")
+        const todoDoc = await Todos( todoData );
+        await todoDoc.save();
+        console.warn("todo Record")
+        const todoRecord = await Todos.findOne({ user: todoData.user });
+        console.warn("PW")
+        const { description, ...todoInfo } = todoData;
+
+        expect( todoRecord ).toEqual( expect.objectContaining( todoInfo ) );
+    });
+
+
+    afterAll( async ()=>{
+        console.warn("PW2")
+        const dbClient = await dbClientInstance_;
+        const { connection } = dbClient;
+        await connection.dropDatabase();
+        await dbClient.disconnect();
+    });
+});
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