Update test coverage for th D librairy

Author: timoa

src/lib/db.js

@@ -18,4 +18,8 @@ function connect() {
     .catch(err => logger.error(err));
 }
 
-module.exports = { connect };
+function close() {
+  mongoose.connection.close();
+}
+
+module.exports = { connect, close };

test/lib.db.spec.js

@@ -2,9 +2,25 @@ const { expect } = require('chai');
 const db = require('../src/lib/db');
 
 // DB
-describe('DB library', () => {
+describe('DB Connect', () => {
   it('expect "connect" to be a function', (done) => {
     expect(typeof (db.connect)).to.be.equals('function');
     done();
   });
+  it('expect "connect" to not throw', (done) => {
+    expect(db.connect).to.not.throw();
+    db.close();
+    done();
+  });
+});
+
+describe('DB Close', () => {
+  it('expect "close" to be a function', (done) => {
+    expect(typeof (db.close)).to.be.equals('function');
+    done();
+  });
+  it('expect "close" to not throw', (done) => {
+    expect(db.close).to.not.throw();
+    done();
+  });
 });