test(purchases): unit test FK link

This commit adds a unit test to ensure the foreign keys work and that
values are deleted from the purchase_item table when they are removed
from the purchase table.

server/controllers/finance/purchases.js

@@ -549,7 +549,7 @@ async function remove(req, res, next) {
 
     const WAITING_CONFIRMATION = 1;
     if (record.status_id !== WAITING_CONFIRMATION) {
-      throw new BadRequest('Cannot remove a purchase order that is confirmed');
+      throw new BadRequest('Can only remove purchase orders that have been confirmed.');
     }
 
     // there is no financial writings about purchase orders, so we simply need to delete it
@@ -628,9 +628,7 @@ function resetPurchaseIntervall(purchaseUuid) {
   return db.exec(sql, [db.bid(purchaseUuid)])
     .then((rows) => {
       const inventories = rows.map(item => item.inventory_uuid);
-
       const transactions = purchaceIntervalleSetting(inventories);
-
       return transactions.execute();
     })
     .then((items) => {

test/server-unit/db.spec.js

@@ -7,7 +7,6 @@ function DatabaseUnitTests() {
     db = require('../../server/lib/db');
   });
 
-
   it('should check the connection to mysql', (done) => {
     db.pool.getConnection(err => {
       if (err) {
@@ -19,7 +18,12 @@ function DatabaseUnitTests() {
     });
   });
 
-  it('#should try to retrieve data from a specific table (unit)', (done) => {
+  it('#exec() should retrieve a promise result', async () => {
+    const [result] = await db.exec('SELECT 1 + 1 AS two;');
+    expect(result).to.deep.equal({ two : 2 });
+  });
+
+  it('should try to retrieve data from a specific table (unit)', (done) => {
     db.exec('SELECT * FROM unit LIMIT 2')
       .then(rows => {
         expect(rows).to.have.lengthOf(2);

test/server-unit/purchases/purchases.spec.js

@@ -0,0 +1,42 @@
+/* eslint global-require:off */
+const { expect } = require('chai');
+const uuid = require('uuid').v4;
+
+function PurchaseUnitTests() {
+  let db;
+  before(() => {
+    db = require('../../../server/lib/db');
+  });
+
+  it('should remove purchase items on purchase delete', async () => {
+    // test setup - create a purchase order
+    const puid = uuid();
+    const prednisone = 'c3fd5a02-6a75-49fc-b2f3-76ee4c3fbfb7';
+
+    // create the purchase order
+    await db.exec(`
+      INSERT INTO purchase VALUES
+        (HUID('${puid}'), 2, 1, 300, 2, HUID('3ac4e83c-65f2-45a1-8357-8b025003d793'),
+        DATE_ADD(CURRENT_DATE, INTERVAL -1725 DAY), CURRENT_TIMESTAMP, 1, NULL, NULL, 1);
+    `);
+
+    // create a purchase item linked to the above purchase order.
+    await db.exec(`INSERT INTO purchase_item VALUES
+      (HUID('${uuid()}'), HUID('${puid}'), HUID('${prednisone}'), 2000, 0.15, (2000 * 0.15));`);
+
+    const [purchase] = await db.exec(`SELECT * FROM purchase WHERE uuid = HUID('${puid}');`);
+    expect(purchase.cost).to.equal(300);
+
+    // okay, now that we know our data is built, actually test if the data is deleted
+    // correctly.
+    await db.exec(`DELETE FROM purchase WHERE uuid = HUID('${puid}');`);
+
+    const purchases = await db.exec(`SELECT * FROM purchase WHERE uuid = HUID('${puid}');`);
+    expect(purchases).to.have.length(0);
+    const items = await db.exec(`SELECT * FROM purchase_item WHERE purchase_uuid = HUID('${puid}');`);
+    expect(items).to.have.length(0);
+  });
+
+}
+
+describe('Purchase Orders', PurchaseUnitTests);