Add fixtures to the part test

- Make development of further tests much easier

InvenTree/part/fixtures/category.yaml

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+# Create some PartCategory objects
+
+- model: part.partcategory
+  pk: 1
+  fields:
+    name: Electronics
+    description: Electronic components
+    parent: null
+    default_location: null
+- model: part.partcategory
+  pk: 2
+  fields:
+    name: Resistors
+    description: Resistors
+    parent: 1
+    default_location: null
+- model: part.partcategory
+  pk: 3
+  fields:
+    name: Capacitors
+    description: Capacitors
+    parent: 1
+    default_location: null
+- model: part.partcategory
+  pk: 4
+  fields:
+    name: IC
+    description: Integrated Circuits
+    parent: 1
+    default_location: null
+- model: part.partcategory
+  pk: 5
+  fields:
+    name: MCU
+    description: Microcontrollers
+    parent: 4
+    default_location: null
+- model: part.partcategory
+  pk: 6
+  fields:
+    name: Transceivers
+    description: Communication interfaces
+    parent: 4
+    default_location: null
+- model: part.partcategory
+  pk: 7
+  fields:
+    name: Mechanical
+    description: Mechanical componenets
+    default_location: null
+- model: part.partcategory
+  pk: 8
+  fields:
+    name: Fasteners
+    description: Screws, bolts, etc
+    parent: 7

InvenTree/part/fixtures/part.yaml

@@ -0,0 +1,32 @@
+# Create some fasteners 
+
+- model: part.part
+  fields:
+    name: 'M2x4 LPHS'
+    description: 'M2x4 low profile head screw'
+    category: 8
+- model: part.part
+  fields:
+    name: 'M3x12 SHCS'
+    description: 'M3x12 socket head cap screw'
+    category: 8
+
+# Create some resistors
+
+- model: part.part
+  fields:
+    name: 'R_2K2_0805'
+    description: '2.2kOhm resistor in 0805 package'
+    category: 2
+- model: part.part
+  fields:
+    name: 'R_4K7_0603'
+    description: '4.7kOhm resistor in 0603 package'
+    category: 2
+
+# Create some capacitors
+- model: part.part
+  fields:
+    name: 'C_22N_0805'
+    description: '22nF capacitor in 0805 package'
+    category: 3