WIP: BOM Refactor, building line_item fetch and update logic with ngResource

spec/javascripts/unit/admin/line_items/services/line_items_spec.js.coffee

@@ -0,0 +1,107 @@
+describe "LineItems service", ->
+  LineItems = LineItemResource = lineItems = $httpBackend = null
+
+  beforeEach ->
+    module 'admin.lineItems'
+
+    this.addMatchers
+      toDeepEqual: (expected) ->
+        return angular.equals(this.actual, expected)
+
+    inject ($q, _$httpBackend_, _LineItems_, _LineItemResource_) ->
+      LineItems = _LineItems_
+      LineItemResource = _LineItemResource_
+      $httpBackend = _$httpBackend_
+
+  describe "#index", ->
+    result = response = null
+
+    beforeEach ->
+      response = [{ id: 5, name: 'LineItem 1'}]
+      $httpBackend.expectGET('/admin/line_items.json').respond 200, response
+      result = LineItems.index()
+      $httpBackend.flush()
+
+    it "stores returned data in @lineItemsByID, with ids as keys", ->
+      # LineItemResource returns instances of Resource rather than raw objects
+      expect(LineItems.lineItemsByID).toDeepEqual { 5: response[0] }
+
+    it "stores returned data in @pristineByID, with ids as keys", ->
+      expect(LineItems.pristineByID).toDeepEqual { 5: response[0] }
+
+    it "returns an array of line items", ->
+      expect(result).toDeepEqual response
+
+
+  describe "#save", ->
+    result = null
+
+    describe "success", ->
+      lineItem = null
+      resolved = false
+
+      beforeEach ->
+        lineItem = new LineItemResource({ id: 15, order: { number: '12345678'} })
+        $httpBackend.expectPUT('/admin/orders/12345678/line_items/15.json').respond 200, { id: 15, name: 'LineItem 1'}
+        LineItems.save(lineItem).then( -> resolved = true)
+        $httpBackend.flush()
+
+      it "updates the pristine copy of the lineItem", ->
+        # Resource results have extra properties ($then, $promise) that cause them to not
+        # be exactly equal to the response object provided to the expectPUT clause above.
+        expect(LineItems.pristineByID[15]).toEqual lineItem
+
+      it "resolves the promise", ->
+        expect(resolved).toBe(true);
+
+
+    describe "failure", ->
+      lineItem = null
+      rejected = false
+
+      beforeEach ->
+        lineItem = new LineItemResource( { id: 15, order: { number: '12345678'} } )
+        $httpBackend.expectPUT('/admin/orders/12345678/line_items/15.json').respond 422, { error: 'obj' }
+        LineItems.save(lineItem).catch( -> rejected = true)
+        $httpBackend.flush()
+
+      it "does not update the pristine copy of the lineItem", ->
+        expect(LineItems.pristineByID[15]).toBeUndefined()
+
+      it "rejects the promise", ->
+        expect(rejected).toBe(true);
+
+  describe "#isSaved", ->
+    describe "when attributes of the object have been altered", ->
+      beforeEach ->
+        spyOn(LineItems, "diff").andReturn ["attr1", "attr2"]
+
+      it "returns false", ->
+        expect(LineItems.isSaved({})).toBe false
+
+    describe "when attributes of the object have not been altered", ->
+      beforeEach ->
+        spyOn(LineItems, "diff").andReturn []
+
+      it "returns false", ->
+        expect(LineItems.isSaved({})).toBe true
+
+
+  describe "diff", ->
+    beforeEach ->
+      LineItems.pristineByID = { 23: { id: 23, price: 15, quantity: 3, something: 3 } }
+
+    it "returns a list of properties that have been altered and are in the list of updateable attrs", ->
+      expect(LineItems.diff({ id: 23, price: 12, quantity: 3 })).toEqual ["price"]
+      expect(LineItems.diff({ id: 23, price: 15, something: 1 })).toEqual []
+
+
+  describe "resetAttribute", ->
+    lineItem = { id: 23, price: 15 }
+
+    beforeEach ->
+      LineItems.pristineByID = { 23: { id: 23, price: 12, quantity: 3 } }
+
+    it "resets the specified value according to the pristine record", ->
+      LineItems.resetAttribute(lineItem, "price")
+      expect(lineItem.price).toEqual 12