diff --git a/.travis.yml b/.travis.yml
index c386329854..cd2093c55a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ before_install:
     - make setup_ci
 
 script:
-    - make test
+    - make coverage
     - make style
 
 after_success:
diff --git a/InvenTree/InvenTree/models.py b/InvenTree/InvenTree/models.py
index 94dee8e95c..2b49f7b908 100644
--- a/InvenTree/InvenTree/models.py
+++ b/InvenTree/InvenTree/models.py
@@ -74,9 +74,9 @@ class InvenTreeTree(models.Model):
     @property
     def children(self):
         contents = ContentType.objects.get_for_model(type(self))
-        children = contents.get_all_objects_for_this_type(parent=self.id)
+        childs = contents.get_all_objects_for_this_type(parent=self.id)
 
-        return children
+        return childs
 
     def getAcceptableParents(self):
         """ Returns a list of acceptable parent items within this model
@@ -187,11 +187,8 @@ def FilterChildren(queryset, parent):
     elif str2bool(parent, False):
         return queryset.filter(parent=None)
     else:
-        try:
-            parent_id = int(parent)
-            if parent_id == 0:
-                return queryset.filter(parent=None)
-            else:
-                return queryset.filter(parent=parent_id)
-        except:
-            return queryset
+        parent_id = int(parent)
+        if parent_id == 0:
+            return queryset.filter(parent=None)
+        else:
+            return queryset.filter(parent=parent_id)
diff --git a/InvenTree/build/models.py b/InvenTree/build/models.py
index d09e751878..c72aa5209b 100644
--- a/InvenTree/build/models.py
+++ b/InvenTree/build/models.py
@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 from django.utils.translation import ugettext as _
 
+from django.urls import reverse
 from django.db import models
 from django.core.validators import MinValueValidator
 
@@ -14,7 +15,7 @@ class Build(models.Model):
     """
 
     def get_absolute_url(self):
-        return '/build/{pk}/'.format(pk=self.id)
+        return reverse('build-detail', kwargs={'pk': self.id})
 
     # Build status codes
     PENDING = 10  # Build is pending / active
diff --git a/InvenTree/build/tests.py b/InvenTree/build/tests.py
index c2de5b3ab1..1918ce9b27 100644
--- a/InvenTree/build/tests.py
+++ b/InvenTree/build/tests.py
@@ -1,6 +1,56 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-# from django.test import TestCase
+from django.test import TestCase
 
-# Create your tests here.
+from .models import Build
+from part.models import Part
+
+
+class BuildTestSimple(TestCase):
+
+    def setUp(self):
+        part = Part.objects.create(name='Test part',
+                                   description='Simple description')
+        Build.objects.create(part=part,
+                             batch='B1',
+                             status=Build.PENDING,
+                             title='Building 7 parts',
+                             quantity=7,
+                             notes='Some simple notes')
+
+        Build.objects.create(part=part,
+                             batch='B2',
+                             status=Build.COMPLETE,
+                             title='Building 21 parts',
+                             quantity=21,
+                             notes='Some simple notes')
+
+    def test_build_objects(self):
+        # Ensure the Build objects were correctly created
+        self.assertEqual(Build.objects.count(), 2)
+        b = Build.objects.get(pk=2)
+        self.assertEqual(b.batch, 'B2')
+        self.assertEqual(b.quantity, 21)
+
+    def test_url(self):
+        b1 = Build.objects.get(pk=1)
+        self.assertEqual(b1.get_absolute_url(), '/build/1/')
+
+    def test_is_complete(self):
+        b1 = Build.objects.get(pk=1)
+        b2 = Build.objects.get(pk=2)
+
+        self.assertEqual(b1.is_complete, False)
+        self.assertEqual(b2.is_complete, True)
+
+    def test_is_active(self):
+        b1 = Build.objects.get(pk=1)
+        b2 = Build.objects.get(pk=2)
+
+        self.assertEqual(b1.is_active, True)
+        self.assertEqual(b2.is_active, False)
+
+    def test_required_parts(self):
+        # TODO - Generate BOM for test part
+        pass
diff --git a/InvenTree/company/models.py b/InvenTree/company/models.py
index fc864ecc19..fe97d9a90c 100644
--- a/InvenTree/company/models.py
+++ b/InvenTree/company/models.py
@@ -4,6 +4,7 @@ from __future__ import unicode_literals
 import os
 
 from django.db import models
+from django.urls import reverse
 
 
 def rename_company_image(instance, filename):
@@ -56,7 +57,7 @@ class Company(models.Model):
         return "{n} - {d}".format(n=self.name, d=self.description)
 
     def get_absolute_url(self):
-        return "/company/{id}/".format(id=self.id)
+        return reverse('company-detail', kwargs={'pk': self.id})
 
     @property
     def part_count(self):
diff --git a/InvenTree/company/tests.py b/InvenTree/company/tests.py
index a79ca8be56..925d9eb104 100644
--- a/InvenTree/company/tests.py
+++ b/InvenTree/company/tests.py
@@ -1,3 +1,19 @@
-# from django.test import TestCase
+from django.test import TestCase
 
-# Create your tests here.
+from .models import Company
+
+
+class CompanySimpleTest(TestCase):
+
+    def setUp(self):
+        Company.objects.create(name='ABC Co.',
+                               description='Seller of ABC products',
+                               website='www.abc-sales.com',
+                               address='123 Sales St.',
+                               is_customer=False,
+                               is_supplier=True)
+
+    def test_company_model(self):
+        c = Company.objects.get(pk=1)
+        self.assertEqual(c.name, 'ABC Co.')
+        self.assertEqual(c.get_absolute_url(), '/company/1/')
diff --git a/InvenTree/part/forms.py b/InvenTree/part/forms.py
index 28d9941326..4d7d05bba1 100644
--- a/InvenTree/part/forms.py
+++ b/InvenTree/part/forms.py
@@ -89,21 +89,21 @@ class EditBomItemForm(HelperForm):
 
 class EditSupplierPartForm(HelperForm):
 
-        class Meta:
-            model = SupplierPart
-            fields = [
-                'supplier',
-                'SKU',
-                'part',
-                'description',
-                'URL',
-                'manufacturer',
-                'MPN',
-                'note',
-                'single_price',
-                'base_cost',
-                'multiple',
-                'minimum',
-                'packaging',
-                'lead_time'
-            ]
+    class Meta:
+        model = SupplierPart
+        fields = [
+            'supplier',
+            'SKU',
+            'part',
+            'description',
+            'URL',
+            'manufacturer',
+            'MPN',
+            'note',
+            'single_price',
+            'base_cost',
+            'multiple',
+            'minimum',
+            'packaging',
+            'lead_time'
+        ]
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index 80a4a5da35..6c9dc4ec54 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -9,6 +9,7 @@ import tablib
 
 from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ValidationError
+from django.urls import reverse
 
 from django.db import models
 from django.core.validators import MinValueValidator
@@ -25,7 +26,7 @@ class PartCategory(InvenTreeTree):
     """
 
     def get_absolute_url(self):
-        return '/part/category/{id}/'.format(id=self.id)
+        return reverse('category-detail', kwargs={'pk': self.id})
 
     class Meta:
         verbose_name = "Part Category"
@@ -88,7 +89,7 @@ class Part(models.Model):
     """
 
     def get_absolute_url(self):
-        return '/part/{id}/'.format(id=self.id)
+        return reverse('part-detail', kwargs={'pk': self.id})
 
     # Short name of the part
     name = models.CharField(max_length=100, unique=True, help_text='Part name (must be unique)')
@@ -336,7 +337,7 @@ class BomItem(models.Model):
     """
 
     def get_absolute_url(self):
-        return '/part/bom/{id}/'.format(id=self.id)
+        return reverse('bom-detail', kwargs={'pk': self.id})
 
     # A link to the parent part
     # Each part will get a reverse lookup field 'bom_items'
@@ -385,7 +386,7 @@ class SupplierPart(models.Model):
     """
 
     def get_absolute_url(self):
-        return "/supplier-part/{id}/".format(id=self.id)
+        return reverse('supplier-part-detail', kwargs={'pk': self.id})
 
     class Meta:
         unique_together = ('part', 'supplier', 'SKU')
diff --git a/InvenTree/part/test_bom_item.py b/InvenTree/part/test_bom_item.py
new file mode 100644
index 0000000000..e3d7aa78ce
--- /dev/null
+++ b/InvenTree/part/test_bom_item.py
@@ -0,0 +1,7 @@
+from django.test import TestCase
+
+
+class BomItemTest(TestCase):
+
+    def setUp(self):
+        pass
diff --git a/InvenTree/part/test_category.py b/InvenTree/part/test_category.py
new file mode 100644
index 0000000000..9fee29332c
--- /dev/null
+++ b/InvenTree/part/test_category.py
@@ -0,0 +1,66 @@
+from django.test import TestCase
+
+from .models import Part, PartCategory
+
+
+class CategoryTest(TestCase):
+    """
+    Tests to ensure that the relational category tree functions correctly.
+    """
+
+    def setUp(self):
+        self.p1 = PartCategory.objects.create(name='A',
+                                              description='Most highest level',
+                                              parent=None)
+
+        self.p2 = PartCategory.objects.create(name='B',
+                                              description='Sits under second',
+                                              parent=self.p1)
+
+        self.p3 = PartCategory.objects.create(name='C',
+                                              description='Third tier category',
+                                              parent=self.p2)
+
+        # Add two parts in p2
+        Part.objects.create(name='Flange', category=self.p2)
+        Part.objects.create(name='Flob', category=self.p2)
+
+        # Add one part in p3
+        Part.objects.create(name='Blob', category=self.p3)
+
+    def test_parents(self):
+        self.assertEqual(self.p1.parent, None)
+        self.assertEqual(self.p2.parent, self.p1)
+        self.assertEqual(self.p3.parent, self.p2)
+
+    def test_children_count(self):
+        self.assertEqual(self.p1.has_children, True)
+        self.assertEqual(self.p2.has_children, True)
+        self.assertEqual(self.p3.has_children, False)
+
+    def test_unique_childs(self):
+        childs = self.p1.getUniqueChildren()
+
+        self.assertIn(self.p2.id, childs)
+        self.assertIn(self.p2.id, childs)
+
+    def test_unique_parents(self):
+        parents = self.p2.getUniqueParents()
+
+        self.assertIn(self.p1.id, parents)
+
+    def test_path_string(self):
+        self.assertEqual(str(self.p3), 'A/B/C')
+
+    def test_url(self):
+        self.assertEqual(self.p1.get_absolute_url(), '/part/category/1/')
+
+    def test_part_count(self):
+        # No direct parts in the top-level category
+        self.assertEqual(self.p1.has_parts, False)
+        self.assertEqual(self.p2.has_parts, True)
+        self.assertEqual(self.p3.has_parts, True)
+
+        self.assertEqual(self.p1.partcount, 3)
+        self.assertEqual(self.p2.partcount, 3)
+        self.assertEqual(self.p3.partcount, 1)
diff --git a/InvenTree/part/test_part.py b/InvenTree/part/test_part.py
new file mode 100644
index 0000000000..c9ed2fd7b3
--- /dev/null
+++ b/InvenTree/part/test_part.py
@@ -0,0 +1,23 @@
+from django.test import TestCase
+
+from .models import Part, PartCategory
+
+
+class SimplePartTest(TestCase):
+
+    def setUp(self):
+
+        cat = PartCategory.objects.create(name='TLC', description='Top level category')
+
+        self.px = Part.objects.create(name='x', description='A part called x', buildable=True)
+        self.py = Part.objects.create(name='y', description='A part called y', consumable=False)
+        self.pz = Part.objects.create(name='z', description='A part called z', category=cat)
+
+    def test_metadata(self):
+        self.assertEqual(self.px.name, 'x')
+        self.assertEqual(self.py.get_absolute_url(), '/part/2/')
+        self.assertEqual(str(self.pz), 'z - A part called z')
+
+    def test_category(self):
+        self.assertEqual(self.px.category_path, '')
+        self.assertEqual(self.pz.category_path, 'TLC')
diff --git a/InvenTree/part/test_supplier_part.py b/InvenTree/part/test_supplier_part.py
new file mode 100644
index 0000000000..c34b788257
--- /dev/null
+++ b/InvenTree/part/test_supplier_part.py
@@ -0,0 +1,7 @@
+from django.test import TestCase
+
+
+class SupplierPartTest(TestCase):
+
+    def setUp(self):
+        pass
diff --git a/InvenTree/part/tests.py b/InvenTree/part/tests.py
deleted file mode 100644
index a79ca8be56..0000000000
--- a/InvenTree/part/tests.py
+++ /dev/null
@@ -1,3 +0,0 @@
-# from django.test import TestCase
-
-# Create your tests here.
diff --git a/InvenTree/part/urls.py b/InvenTree/part/urls.py
index 75d5041b9c..14a15625f9 100644
--- a/InvenTree/part/urls.py
+++ b/InvenTree/part/urls.py
@@ -70,23 +70,3 @@ part_urls = [
     # Top level part list (display top level parts and categories)
     url(r'^.*$', views.PartIndex.as_view(), name='part-index'),
 ]
-
-"""
-part_param_urls = [
-    # Detail of a single part parameter
-    url(r'^(?P<pk>[0-9]+)/?$', views.PartParamDetail.as_view(), name='partparameter-detail'),
-
-    # Parameters associated with a particular part
-    url(r'^\?.*/?$', views.PartParamList.as_view()),
-    url(r'^$', views.PartParamList.as_view()),
-]
-
-part_param_template_urls = [
-    # Detail of a single part field template
-    url(r'^(?P<pk>[0-9]+)/?$', views.PartTemplateDetail.as_view(), name='partparametertemplate-detail'),
-
-    # List all part field templates
-    url(r'^\?.*/?$', views.PartTemplateList.as_view()),
-    url(r'^$', views.PartTemplateList.as_view())
-]
-"""
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index 6af5b3d4b7..312bff9bbe 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -3,6 +3,7 @@ from __future__ import unicode_literals
 
 from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ValidationError
+from django.urls import reverse
 
 from django.db import models, transaction
 from django.core.validators import MinValueValidator
@@ -25,7 +26,7 @@ class StockLocation(InvenTreeTree):
     """
 
     def get_absolute_url(self):
-        return '/stock/location/{id}/'.format(id=self.id)
+        return reverse('stock-location-detail', kwargs={'pk': self.id})
 
     @property
     def stock_items(self):
@@ -109,7 +110,7 @@ class StockItem(models.Model):
             })
 
     def get_absolute_url(self):
-        return '/stock/item/{id}/'.format(id=self.id)
+        return reverse('stock-item-detail', kwargs={'pk': self.id})
 
     class Meta:
         unique_together = [
@@ -331,7 +332,7 @@ class StockItemTracking(models.Model):
     """
 
     def get_absolute_url(self):
-        return '/stock/track/{id}/'.format(id=self.id)
+        return reverse('stock-tracking-detail', kwargs={'pk': self.id})
 
     # Stock item
     item = models.ForeignKey(StockItem, on_delete=models.CASCADE,
diff --git a/InvenTree/stock/test_stock_item.py b/InvenTree/stock/test_stock_item.py
new file mode 100644
index 0000000000..becd6e4e69
--- /dev/null
+++ b/InvenTree/stock/test_stock_item.py
@@ -0,0 +1,7 @@
+from django.test import TestCase
+
+
+class StockItemTest(TestCase):
+
+    def setUp(self):
+        pass
diff --git a/InvenTree/stock/test_stock_location.py b/InvenTree/stock/test_stock_location.py
new file mode 100644
index 0000000000..0a89aeed33
--- /dev/null
+++ b/InvenTree/stock/test_stock_location.py
@@ -0,0 +1,7 @@
+from django.test import TestCase
+
+
+class StockLocationTest(TestCase):
+
+    def setUp(self):
+        pass
diff --git a/InvenTree/stock/test_stock_tracking.py b/InvenTree/stock/test_stock_tracking.py
new file mode 100644
index 0000000000..15b79cbe66
--- /dev/null
+++ b/InvenTree/stock/test_stock_tracking.py
@@ -0,0 +1,7 @@
+from django.test import TestCase
+
+
+class StockTrackingTest(TestCase):
+
+    def setUp(self):
+        pass
diff --git a/InvenTree/stock/tests.py b/InvenTree/stock/tests.py
deleted file mode 100644
index a79ca8be56..0000000000
--- a/InvenTree/stock/tests.py
+++ /dev/null
@@ -1,3 +0,0 @@
-# from django.test import TestCase
-
-# Create your tests here.
diff --git a/Makefile b/Makefile
index 7586b678a4..8db2a2110c 100644
--- a/Makefile
+++ b/Makefile
@@ -11,11 +11,8 @@ style:
 	flake8 InvenTree --ignore=C901,E501
 
 test:
-	# Perform Django system checks
 	python InvenTree/manage.py check
-
-	# Run the test framework (through coverage script)
-	coverage run InvenTree/manage.py test
+	python manage.py test build company part stock
 
 migrate:
 	python InvenTree/manage.py makemigrations company
@@ -26,7 +23,6 @@ migrate:
 	python InvenTree/manage.py check
 
 install:
-	# TODO: replace this with a proper setup.py
 	pip install -U -r requirements/base.txt
 	
 	# Generate a secret key
@@ -37,5 +33,10 @@ setup: install migrate
 setup_ci:
 	pip install -U -r requirements/build.txt
 
+coverage:
+	python InvenTree/manage.py check
+	coverage run InvenTree/manage.py test build company part stock
+	coverage html
+
 superuser:
 	python InvenTree/manage.py createsuperuser