diff --git a/src/Models/Core/MainModule/BTKPlugin/init.spec.lua b/src/Models/Core/MainModule/BTKPlugin/init.spec.lua
new file mode 100644
index 0000000..9b5717a
--- /dev/null
+++ b/src/Models/Core/MainModule/BTKPlugin/init.spec.lua
@@ -0,0 +1,16 @@
+return function()
+    local BTKPlugin = require(script.Parent)
+
+    describe("BTKPlugin", function()
+        it("should require ok", function()
+            expect(BTKPlugin).to.be.ok()
+        end)
+
+        --[[
+        --- @TODO no support for emulating plugins yet
+        it("should new ok", function()
+            expect(BTKPlugin:new()).to.be.ok()
+        end)
+        --]]
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/Components/AssetItem.spec.lua b/src/Models/Core/MainModule/UI/Components/AssetItem.spec.lua
new file mode 100644
index 0000000..da87596
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/Components/AssetItem.spec.lua
@@ -0,0 +1,16 @@
+return function()
+    local AssetItem = require(script.Parent.AssetItem)
+
+    describe("AssetItem", function()
+        it("should require ok", function()
+            expect(AssetItem).to.be.ok()
+        end)
+
+        --[[
+        --- @TODO cannot emulate marketplaceservice yet
+        it("should new ok", function()
+            expect(AssetItem:init()).to.be.ok()
+        end)
+        --]]
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/Components/AssetsWidget.lua b/src/Models/Core/MainModule/UI/Components/AssetsWidget.lua
index 85d1712..f40a038 100644
--- a/src/Models/Core/MainModule/UI/Components/AssetsWidget.lua
+++ b/src/Models/Core/MainModule/UI/Components/AssetsWidget.lua
@@ -11,6 +11,7 @@ local c = Roact.createElement
 local AssetsWidget = Roact.Component:extend("AssetsWidget")
 
 function AssetsWidget:init(props)
+    assert(props)
     self.state = {
         Plugin = props.Plugin,
         CurrentCategory = nil,
diff --git a/src/Models/Core/MainModule/UI/Components/AssetsWidget.spec.lua b/src/Models/Core/MainModule/UI/Components/AssetsWidget.spec.lua
new file mode 100644
index 0000000..c91e513
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/Components/AssetsWidget.spec.lua
@@ -0,0 +1,15 @@
+return function()
+    local AssetsWidget = require(script.Parent.AssetsWidget)
+
+    describe("AssetsWidget", function()
+        it("should require ok", function()
+            expect(AssetsWidget).to.be.ok()
+        end)
+
+        it("should new ok", function()
+            expect(AssetsWidget:init({
+                Plugin = "foo",
+            })).never.to.be.ok()
+        end)
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/Components/ConfigurationWidget.spec.lua b/src/Models/Core/MainModule/UI/Components/ConfigurationWidget.spec.lua
new file mode 100644
index 0000000..ecc8bd7
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/Components/ConfigurationWidget.spec.lua
@@ -0,0 +1,15 @@
+return function()
+    local ConfigurationWidget = require(script.Parent.ConfigurationWidget)
+
+    describe("ConfigurationWidget", function()
+        it("should require ok", function()
+            expect(ConfigurationWidget).to.be.ok()
+        end)
+
+        --[[ @TODO no support for selection
+        it("should new ok", function()
+            expect(ConfigurationWidget:init({})).never.to.be.ok()
+        end)
+        --]]
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/Components/Dropdown.spec.lua b/src/Models/Core/MainModule/UI/Components/Dropdown.spec.lua
new file mode 100644
index 0000000..a7d4354
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/Components/Dropdown.spec.lua
@@ -0,0 +1,13 @@
+return function()
+    local Dropdown = require(script.Parent.Dropdown)
+
+    describe("Dropdown", function()
+        it("should require ok", function()
+            expect(Dropdown).to.be.ok()
+        end)
+
+        it("should new ok", function()
+            expect(Dropdown:init({})).never.to.be.ok()
+        end)
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/Components/TextLabel.spec.lua b/src/Models/Core/MainModule/UI/Components/TextLabel.spec.lua
new file mode 100644
index 0000000..965cf5d
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/Components/TextLabel.spec.lua
@@ -0,0 +1,13 @@
+return function()
+    local TextLabel = require(script.Parent.TextLabel)
+
+    describe("TextLabel", function()
+        it("should require ok", function()
+            expect(TextLabel).to.be.ok()
+        end)
+
+        it("should new ok", function()
+            expect(TextLabel:init({})).never.to.be.ok()
+        end)
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/UI/init.spec.lua b/src/Models/Core/MainModule/UI/init.spec.lua
new file mode 100644
index 0000000..005ba15
--- /dev/null
+++ b/src/Models/Core/MainModule/UI/init.spec.lua
@@ -0,0 +1,13 @@
+return function()
+    local UI = require(script.Parent)
+
+    describe("UI", function()
+        it("should require ok", function()
+            expect(UI).to.be.ok()
+        end)
+
+        it("should new ok", function()
+            expect(UI:new()).to.be.ok()
+        end)
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/scripts/Area.lua b/src/Models/Core/MainModule/scripts/Area.lua
index f9b2bfc..f5b3537 100644
--- a/src/Models/Core/MainModule/scripts/Area.lua
+++ b/src/Models/Core/MainModule/scripts/Area.lua
@@ -7,14 +7,12 @@ local Area = Model:subclass(script.Name)
 Area:AddProperty({
 	Name = "AreaPart",
 	Type = "ObjectValue",
-	ValueFn = function(self2)
-		return self2:GetPrimaryPart()
-	end,
-	SchemaFn = Schema:IsA("BasePart"),
+	SchemaFn = Schema.Optional(Schema:IsA("BasePart")),
 })
 
 function Area:initialize(input)
 	Model.initialize(self, input)
+	self:SetAreaPart(self:GetPrimaryPart())
 
 	local partValue = self:GetAreaPart()
 	partValue.Anchored = true
diff --git a/src/Models/Core/MainModule/scripts/Area.spec.lua b/src/Models/Core/MainModule/scripts/Area.spec.lua
new file mode 100644
index 0000000..090173e
--- /dev/null
+++ b/src/Models/Core/MainModule/scripts/Area.spec.lua
@@ -0,0 +1,18 @@
+return function()
+    local Area = require(script.Parent.Area)
+
+    describe("Area", function()
+        it("should require ok", function()
+            expect(Area).to.be.ok()
+        end)
+
+        --[[
+        --- @TODO this fails now
+        it("should new ok", function()
+            expect(Area:new({
+                Script = Instance.new("Script"),
+            })).to.be.ok()
+        end)
+        --]]
+    end)
+end
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/scripts/Collectable.lua b/src/Models/Core/MainModule/scripts/Collectable.lua
index 44dd863..d1556d1 100644
--- a/src/Models/Core/MainModule/scripts/Collectable.lua
+++ b/src/Models/Core/MainModule/scripts/Collectable.lua
@@ -8,23 +8,19 @@ local Collectable = Model:subclass(script.Name)
 Collectable:AddProperty({
     Name = "CollectablePart",
     Type = "ObjectValue",
-    ValueFn = function(self2)
-        return self2:GetPrimaryPart()
-    end,
-    SchemaFn = Schema:IsA("BasePart"),
+    SchemaFn = Schema.Optional(Schema:IsA("BasePart")),
 })
 
 Collectable:AddProperty({
     Name = "CollectableAttachment",
     Type = "ObjectValue",
-    ValueFn = function(self2)
-        return Instance.new("Attachment", self2:GetCollectablePart())
-    end,
-    SchemaFn = Schema:IsA("Attachment"),
+    SchemaFn = Schema.Optional(Schema:IsA("Attachment")),
 })
 
 function Collectable:initialize(input)
     Model.initialize(self, input)
+    self:SetCollectableAttachment(self:GetPrimaryPart())
+    self:SetCollectableAttachment(Instance.new("Attachment", self:GetCollectablePart()))
 end
 
 return Collectable
\ No newline at end of file
diff --git a/src/Models/Core/MainModule/scripts/PlatformMover.lua b/src/Models/Core/MainModule/scripts/PlatformMover.lua
index 3882345..bb26b6c 100644
--- a/src/Models/Core/MainModule/scripts/PlatformMover.lua
+++ b/src/Models/Core/MainModule/scripts/PlatformMover.lua
@@ -7,11 +7,6 @@ local PlatformMover = Model:subclass(script.Name)
 PlatformMover:AddProperty({
 	Name = "PlatformPart",
 	Type = "ObjectValue",
-	ValueFn = function(self)
-		local a = self:GetPrimaryPart()
-		a.Anchored = true
-		return a
-	end,
 	SchemaFn = Schema:IsA("BasePart"),
 })
 PlatformMover:AddProperty({
@@ -37,6 +32,9 @@ PlatformMover:AddProperty({
 
 function PlatformMover:initialize(input)
 	Model.initialize(self, input)
+	local a = self:GetPrimaryPart()
+	a.Anchored = true
+	self:SetPlatformPart(a)
 
 	self:GetStartPositionMarker().Transparency = 1
 	self:EndStartPositionMarker().Transparency = 1
diff --git a/src/Models/Core/MainModule/scripts/Tool.lua b/src/Models/Core/MainModule/scripts/Tool.lua
index 322d6c3..7f3fd9d 100644
--- a/src/Models/Core/MainModule/scripts/Tool.lua
+++ b/src/Models/Core/MainModule/scripts/Tool.lua
@@ -10,9 +10,6 @@ local Tool = BaseScript:subclass(script.Name)
 Tool:AddProperty({
 	Name = "Owner",
 	Type = "ObjectValue",
-	ValueFn = function(self)
-		self:_getOwner()
-	end,
 	SchemaFn = Schema.Optional(
 		Schema.CharacterModel
 	),
@@ -27,6 +24,7 @@ Tool:AddProperty({
 
 function Tool:initialize(input)
 	BaseScript.initialize(self, input)
+	self:SetOwner(self:_getOwner())
 
 	self:AssertSchema(input.Root, Schema:IsA("Tool"))