Add extra unit testing for BOM export

.gitignore

@@ -37,6 +37,7 @@ local_settings.py
 
 # Files used for testing
 dummy_image.*
+_tmp.csv
 
 # Sphinx files
 docs/_build

InvenTree/part/test_bom_export.py

@@ -2,6 +2,10 @@
 Unit testing for BOM export functionality
 """
 
+import csv
+from os import read
+from django.http import response
+
 from django.test import TestCase
 
 from django.urls import reverse
@@ -47,13 +51,63 @@ class BomExportTest(TestCase):
 
         self.url = reverse('bom-download', kwargs={'pk': 100})
 
+    def test_bom_template(self):
+        """
+        Test that the BOM template can be downloaded from the server
+        """
+
+        url = reverse('bom-upload-template')
+
+        # Download an XLS template
+        response = self.client.get(url, data={'format': 'xls'})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            response.headers['Content-Disposition'],
+            'attachment; filename="InvenTree_BOM_Template.xls"'
+        )
+
+        # Return a simple CSV template
+        response = self.client.get(url, data={'format': 'csv'})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            response.headers['Content-Disposition'],
+            'attachment; filename="InvenTree_BOM_Template.csv"'
+        )
+
+        filename = '_tmp.csv'
+
+        with open(filename, 'wb') as f:
+            f.write(response.getvalue())
+
+        with open(filename, 'r') as f:
+            reader = csv.reader(f, delimiter=',')
+
+            for line in reader:
+                headers = line
+                break
+
+            expected = [
+                'part_id',
+                'part_ipn',
+                'part_name',
+                'quantity',
+                'optional',
+                'overage',
+                'reference',
+                'note',
+                'inherited',
+                'allow_variants',
+            ]
+
+            # Ensure all the expected headers are in the provided file
+            for header in expected:
+                self.assertTrue(header in headers)
+
     def test_export_csv(self):
         """
         Test BOM download in CSV format
         """
 
-        print("URL", self.url)
-
         params = {
             'file_format': 'csv',
             'cascade': True,
@@ -70,6 +124,47 @@ class BomExportTest(TestCase):
         content = response.headers['Content-Disposition']
         self.assertEqual(content, 'attachment; filename="BOB | Bob | A2_BOM.csv"')
 
+        filename = '_tmp.csv'
+
+        with open(filename, 'wb') as f:
+            f.write(response.getvalue())
+
+        # Read the file
+        with open(filename, 'r') as f:
+            reader = csv.reader(f, delimiter=',')
+
+            for line in reader:
+                headers = line
+                break
+
+            expected = [
+                'level',
+                'bom_id',
+                'parent_part_id',
+                'parent_part_ipn',
+                'parent_part_name',
+                'part_id',
+                'part_ipn',
+                'part_name',
+                'part_description',
+                'sub_assembly',
+                'quantity',
+                'optional',
+                'overage',
+                'reference',
+                'note',
+                'inherited',
+                'allow_variants',
+                'Default Location',
+                'Available Stock',
+            ]
+
+            for header in expected:
+                self.assertTrue(header in headers)
+
+            for header in headers:
+                self.assertTrue(header in expected)
+
     def test_export_xls(self):
         """
         Test BOM download in XLS format