diff --git a/packages/core/src/pattern.mjs b/packages/core/src/pattern.mjs
index 4d0b30cf606..3bd340deff1 100644
--- a/packages/core/src/pattern.mjs
+++ b/packages/core/src/pattern.mjs
@@ -130,15 +130,8 @@ Pattern.prototype.draft = function () {
             this.stores[set].log.error([`Unable to draft part \`${partName}\` (set ${set})`, err])
           }
         } else this.stores[set].log.error(`Unable to draft pattern. Part.draft() is not callable`)
-        try {
-          this.parts[set][partName].hidden =
-            this.parts[set][partName].hidden === true ? true : !this.__wants(partName, set)
-        } catch (err) {
-          this.stores[set].log.error([
-            `Unable to set \`hidden\` property on part \`${partName}\``,
-            err,
-          ])
-        }
+        this.parts[set][partName].hidden =
+          this.parts[set][partName].hidden === true ? true : !this.__wants(partName, set)
       } else {
         this.stores[set].log.debug(
           `Part \`${partName}\` is not needed. Skipping draft and setting hidden to \`true\``
@@ -253,11 +246,12 @@ Pattern.prototype.init = function () {
  * @return {object} this - The Pattern instance
  */
 Pattern.prototype.sample = function () {
+  this.init()
   if (this.settings[0].sample.type === 'option') {
     return this.sampleOption(this.settings[0].sample.option)
   } else if (this.settings[0].sample.type === 'measurement') {
     return this.sampleMeasurement(this.settings[0].sample.measurement)
-  } else if (this.settings.sample.type === 'models') {
+  } else if (this.settings[0].sample.type === 'models') {
     return this.sampleModels(this.settings[0].sample.models, this.settings[0].sample.focus || false)
   }
 }
@@ -268,7 +262,7 @@ Pattern.prototype.sample = function () {
  * @return {object} this - The Pattern instance
  */
 Pattern.prototype.sampleMeasurement = function (measurementName) {
-  this.store.log.debug(`Sampling measurement \`${measurementName}\``)
+  this.stores[0].log.debug(`Sampling measurement \`${measurementName}\``)
   this.__runHooks('preSample')
   this.__applySettings(this.__measurementSets(measurementName))
   this.init()
@@ -283,7 +277,7 @@ Pattern.prototype.sampleMeasurement = function (measurementName) {
  * @return {object} this - The Pattern instance
  */
 Pattern.prototype.sampleModels = function (models, focus = false) {
-  this.store.log.debug(`Sampling models \`${Object.keys(models).join(', ')}\``)
+  this.stores[0].log.debug(`Sampling models \`${Object.keys(models).join(', ')}\``)
   this.__runHooks('preSample')
   this.__applySettings(this.__modelSets(models, focus))
   this.init()
@@ -345,15 +339,7 @@ Pattern.prototype.render = function () {
  * @return {object} this - The Pattern instance
  */
 Pattern.prototype.use = function (plugin, data) {
-  if (this.plugins?.[plugin.name]?.condition && !plugin.condition) {
-    // Plugin was first loaded conditionally, and is now loaded explicitly
-    this.stores[0].log.info(
-      `Plugin \`${plugin.plugin.name} was loaded conditionally earlier, but is now loaded explicitly.`
-    )
-    return this.__loadPlugin(plugin, data)
-  }
-  // New plugin
-  else if (!this.plugins?.[plugin.name])
+  if (!this.plugins?.[plugin.name])
     return plugin.plugin && plugin.condition
       ? this.__useIf(plugin, data) // Conditional plugin
       : this.__loadPlugin(plugin, data) // Regular plugin
@@ -482,8 +468,8 @@ Pattern.prototype.__filterOptionalMeasurements = function () {
  * @return {bool} hidden - true if the part is hidden, or false if not
  */
 Pattern.prototype.__isPartHidden = function (partName) {
-  if (Array.isArray(this.settings.only)) {
-    if (this.settings.only.includes(partName)) return false
+  if (Array.isArray(this.settings[this.activeSet || 0].only)) {
+    if (this.settings[this.activeSet || 0].only.includes(partName)) return false
   }
   if (this.__parts?.[partName]?.hide) return true
   if (this.__parts?.[partName]?.hideAll) return true
@@ -501,9 +487,9 @@ Pattern.prototype.__isPartHidden = function (partName) {
 Pattern.prototype.__isStackHidden = function (stackName) {
   if (!this.stacks[stackName]) return true
   const parts = this.stacks[stackName].getPartNames()
-  if (Array.isArray(this.settings.only)) {
+  if (Array.isArray(this.settings[this.activeStack || 0].only)) {
     for (const partName of parts) {
-      if (this.settings.only.includes(partName)) return false
+      if (this.settings[this.activeStack || 0].only.includes(partName)) return false
     }
   }
   for (const partName of parts) {
@@ -694,7 +680,7 @@ Pattern.prototype.__loadPlugins = function () {
  */
 Pattern.prototype.__loadPluginStoreMethods = function (plugin) {
   if (Array.isArray(plugin.store)) {
-    for (const store of this.stores) store.extend(...plugin.store)
+    for (const store of this.stores) store.extend(plugin.store)
   } else this.stores[0].log.warning(`Plugin store methods should be an Array`)
 }
 
@@ -722,7 +708,7 @@ Pattern.prototype.__macro = function (key, method) {
 Pattern.prototype.__measurementSets = function (measurementName) {
   let val = this.settings[0].measurements[measurementName]
   if (val === undefined)
-    this.stores.log.error(
+    this.stores[0].log.error(
       `Cannot sample measurement \`${measurementName}\` because it's \`undefined\``
     )
   let step = val / 50
@@ -826,7 +812,7 @@ Pattern.prototype.__needs = function (partName, set = 0) {
  */
 Pattern.prototype.__optionSets = function (optionName) {
   let option = this.config.options[optionName]
-  if (typeof option.list === 'object') return this.__listOptionSets(optionName)
+  if (typeof option?.list === 'object') return this.__listOptionSets(optionName)
   const sets = []
   let factor = 1
   let step, val
@@ -917,7 +903,7 @@ Pattern.prototype.__pack = function () {
     for (let stackId of Object.keys(this.settings[0].layout.stacks)) {
       // Some parts are added by late-stage plugins
       if (this.stacks[stackId]) {
-        let transforms = this.settings.layout.stacks[stackId]
+        let transforms = this.settings[this.activeStack || 0].layout.stacks[stackId]
         this.stacks[stackId].generateTransform(transforms)
       }
     }
diff --git a/packages/core/src/stack.mjs b/packages/core/src/stack.mjs
index fd92d2aa25c..96e8ad27d32 100644
--- a/packages/core/src/stack.mjs
+++ b/packages/core/src/stack.mjs
@@ -117,31 +117,11 @@ Stack.prototype.attr = function (name, value, overwrite = false) {
 /** Generates the transform for a stack */
 Stack.prototype.generateTransform = function (transforms) {
   const { move, rotate, flipX, flipY } = transforms
-  const generated = utils.generateStackTransform(move.x, move.y, rotate, flipX, flipY, this)
+  const generated = utils.generateStackTransform( move?.x, move?.y, rotate, flipX, flipY, this)
 
   for (var t in generated) {
     this.attr(t, generated[t], true)
   }
 }
 
-/** Homes the stack so that its top left corner is in (0,0) */
-//Stack.prototype.home = function () {
-//  const parts = this.getPartList()
-//  if (parts.length < 1) return this
-//  for (const part of this.getPartList()) {
-//    part.home()
-//  }
-//
-//  if (parts.length === 1) {
-//    this.topLeft = part.topLeft
-//    this.bottomRigth = part.bottomRight
-//    this.width = part.width
-//    this.height = part.height
-//
-//    return this
-//  }
-//
-//  return this.boundary()
-//}
-
 export default Stack
diff --git a/packages/core/src/store.mjs b/packages/core/src/store.mjs
index d39fe002cea..db0bfbffeee 100644
--- a/packages/core/src/store.mjs
+++ b/packages/core/src/store.mjs
@@ -43,10 +43,10 @@ export function Store(methods = []) {
   }
   this.logs = logs
 
-  for (const method of methods) {
-    if (avoid.indexOf(method[0]) !== -1) {
-      this.logs.warning(`You cannot squat ${method[0]} in the store`)
-    } else set(this, ...method)
+  for (const [path, method] of methods) {
+    if (avoid.indexOf(path) !== -1) {
+      this.log.warning(`You cannot overwrite store.${path}()`)
+    } else set(this, path, method)
   }
 
   return this
@@ -62,10 +62,10 @@ export function Store(methods = []) {
  * @param {function} method - Method to add to the store (variadic)
  * @return {Store} this - The Store instance
  */
-Store.prototype.extend = function (...methods) {
+Store.prototype.extend = function (methods) {
   for (const [path, method] of methods) {
-    if (avoid.indexOf(method[0]) !== -1) {
-      this.log.warning(`You can't squat ${method[0]}in the store`)
+    if (avoid.indexOf(path) !== -1) {
+      this.log.warning(`You cannot overwrite store.${path}()`)
     } else {
       this.log.info(`Extending store with ${path}`)
       set(this, path, (...args) => method(this, ...args))
diff --git a/packages/core/src/svg.mjs b/packages/core/src/svg.mjs
index 7e25df2bb80..5443d1fbbd1 100644
--- a/packages/core/src/svg.mjs
+++ b/packages/core/src/svg.mjs
@@ -60,7 +60,7 @@ Svg.prototype.render = function () {
   this.activeStackIndex = 0
   for (let stackId in this.pattern.stacks) {
     this.activeStack = stackId
-    this.idPrefix = this.pattern.settings[this.activeStackIndex].idPrefix
+    this.idPrefix = this.pattern.settings[this.activeStackIndex]?.idPrefix || 'fs-'
     const stack = this.pattern.stacks[stackId]
     if (!stack.hidden) {
       const stackSvg = this.__renderStack(stack)
diff --git a/packages/core/src/utils.mjs b/packages/core/src/utils.mjs
index 2d3535da39a..4c4429fae09 100644
--- a/packages/core/src/utils.mjs
+++ b/packages/core/src/utils.mjs
@@ -288,7 +288,7 @@ export function deg2rad(degrees) {
  * @param {Stack} stack - The Stack instance
  * @return {string} transform - The SVG transform value
  */
-export const generateStackTransform = (x, y, rotate, flipX, flipY, stack) => {
+export const generateStackTransform = (x=0, y=0, rotate=0, flipX=false, flipY=false, stack) => {
   const transforms = []
   let xTotal = x || 0
   let yTotal = y || 0
diff --git a/packages/core/tests/pattern-other.test.mjs b/packages/core/tests/pattern-other.test.mjs
new file mode 100644
index 00000000000..c289b298480
--- /dev/null
+++ b/packages/core/tests/pattern-other.test.mjs
@@ -0,0 +1,198 @@
+import chai from 'chai'
+import { Design } from '../src/index.mjs'
+
+const expect = chai.expect
+
+describe('Pattern', () => {
+
+  it('Should log an error when a part does not have a name', () => {
+    const part = { draft: ({ part }) => part }
+    const design = new Design()
+    const pattern = new design()
+    pattern.addPart(part)
+    expect(pattern.stores[0].logs.error.length).to.equal(1)
+    expect(pattern.stores[0].logs.error[0]).to.equal('Part must have a name')
+  })
+
+  it('Should log an error when a part does not have a draft method', () => {
+    const from = {
+      name: 'test',
+      draft: ({ points, part }) => {
+        points.test = false
+        return part
+      }
+    }
+    const to = {
+      name: 'testTo',
+      from,
+      draft: ({ points, part }) => {
+        return part
+      }
+    }
+    const design = new Design({ parts: [ to ]})
+    const pattern = new design()
+    pattern.draft()
+    expect(pattern.stores[0].logs.error.length).to.equal(2)
+    expect(pattern.stores[0].logs.error[0][0]).to.equal('Unable to draft part `test` (set 0)')
+    expect(pattern.stores[0].logs.error[1][0]).to.equal('Could not inject part `test` into part `testTo`')
+  })
+
+  it('Not returning the part from the draft method should log an error', () => {
+    const test = {
+      name: 'test',
+      draft: ({ points, part }) => {}
+    }
+    const design = new Design({ parts: [ test ]})
+    const pattern = new design()
+    pattern.draft()
+    expect(pattern.stores[0].logs.error.length).to.equal(1)
+    expect(pattern.stores[0].logs.error[0]).to.equal('Result of drafting part test was undefined. Did you forget to return the part?')
+  })
+
+  it('Should skip unneeded parts', () => {
+    const test = {
+      name: 'test',
+      draft: ({ points, part }) => part
+    }
+    const design = new Design({ parts: [ test ]})
+    const pattern = new design({ only: ['you'] })
+    pattern.draft()
+    expect(pattern.stores[0].logs.debug.length).to.equal(3)
+    expect(pattern.stores[0].logs.debug[2]).to.equal('Part `test` is not needed. Skipping draft and setting hidden to `true`')
+  })
+
+  it('Should return the initialized config', () => {
+    const test = {
+      name: 'test',
+      draft: ({ points, part }) => part
+    }
+    const design = new Design({ parts: [ test ]})
+    const pattern = new design({ only: ['you'] })
+    const config = pattern.getConfig()
+    expect(config.parts[0]).to.equal(test)
+  })
+
+  it('Should skip a plugin that is loaded twice', () => {
+    const test = {
+      name: 'test',
+      draft: ({ points, part }) => part
+    }
+    const plugin = { name: 'test' }
+    const design = new Design({ parts: [ test ]})
+    const pattern = new design({ only: ['you'] })
+    pattern.use(plugin)
+    pattern.use(plugin)
+    pattern.use({ plugin })
+    pattern.use({ plugin })
+    expect(pattern.stores[0].logs.info[1]).to.equal("Plugin `test` was requested, but it's already loaded. Skipping.")
+    expect(pattern.stores[0].logs.info[3]).to.equal("Plugin `test` was requested, but it's already loaded. Skipping.")
+  })
+
+  it('Should log an error of added parts do not have a draft method', () => {
+    const design = new Design()
+    const pattern = new design()
+    pattern.addPart({})
+    expect(pattern.stores[0].logs.error.length).to.equal(1)
+    expect(pattern.stores[0].logs.error[0]).to.equal('Part must have a draft() method')
+  })
+
+  it('Parts in only are never hidden', () => {
+    const test = {
+      name: 'test',
+      hidden: true,
+      draft: ({ points, part }) => part
+    }
+    const design = new Design()
+    const pattern = new design({ only: ['test']})
+    pattern.init()
+    expect(pattern.__isPartHidden('test')).to.equal(false)
+  })
+
+  it('Stacks with parts in only are never hidden', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design({ only: [ 'test' ] })
+    pattern.draft().render()
+    expect(pattern.__isStackHidden('test')).to.equal(false)
+  })
+
+  it('Stacks with parts in only are never hidden', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design({ only: [ 'test' ] })
+    pattern.draft().render()
+    expect(pattern.__isStackHidden('test')).to.equal(false)
+  })
+
+  it('Stacks with hidden dependencies should set hidden', () => {
+    const part1 = {
+      name: 'test1',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const part2 = {
+      name: 'test2',
+      from: part1,
+      hideDependencies: true,
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part2] })
+    const pattern = new design()
+    const config = pattern.getConfig()
+    expect(config.parts[1].hideAll).to.equal(true)
+  })
+
+  it('Drafts with errors should not get packed', () => {
+    const part= {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+        joints.foo = 'bar'
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design()
+    pattern.draft().render()
+    expect(pattern.stores[0].logs.error.length).to.equal(1)
+    expect(pattern.stores[0].logs.error[0][0]).to.equal('Unable to draft part `test` (set 0)')
+  })
+
+  it('Handle layout object', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design({ layout: { stacks: { test: { flipX: true } } } })
+    const props = pattern.draft().getRenderProps()
+    // FIXME: Add assertions here
+    //expect(pattern.__isStackHidden('test')).to.equal(false)
+  })
+})
diff --git a/packages/core/tests/pattern-sample.test.mjs b/packages/core/tests/pattern-sample.test.mjs
index 219a6e55c66..b79f0384d82 100644
--- a/packages/core/tests/pattern-sample.test.mjs
+++ b/packages/core/tests/pattern-sample.test.mjs
@@ -1,42 +1,191 @@
 import chai from 'chai'
-//import { round, Pattern, Design, pctBasedOn } from '../src/index.mjs'
+import { round, Pattern, Design, pctBasedOn } from '../src/index.mjs'
 
 const expect = chai.expect
 
 describe('Pattern', () => {
   describe('Pattern.sample()', () => {
-    it('FIXME: Write some tests here', () => {
-      expect(true).to.equal(true)
+
+    it('Should sample an option', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: { pct: 50, min: 20, max: 80 },
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { head: 400 },
+        sample: {
+          type: 'option',
+          option: 'size'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores.length).to.equal(10)
+      expect(pattern.settings.length).to.equal(10)
+      expect(pattern.parts[9].test.paths.test.ops[1].to.y).to.equal(320)
+    })
+
+    it('Should sample a static option', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: 0.05,
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { head: 400 },
+        sample: {
+          type: 'option',
+          option: 'size'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores.length).to.equal(10)
+      expect(pattern.settings.length).to.equal(10)
+      expect(round(pattern.parts[9].test.paths.test.ops[1].to.y)).to.equal(22)
+    })
+
+    it('Should sample a list option', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: { dflt: 5, list: [1, 2, 3, 4, 5 ,6 ,7, 8, 9, 10] },
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size/10))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { head: 400 },
+        sample: {
+          type: 'option',
+          option: 'size'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores.length).to.equal(10)
+      expect(pattern.settings.length).to.equal(10)
+      expect(pattern.parts[9].test.paths.test.ops[1].to.y).to.equal(400)
+    })
+
+    it('Should sample a measurement', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: { pct: 50, min: 20, max: 80 },
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { head: 400 },
+        sample: {
+          type: 'measurement',
+          measurement: 'head'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores.length).to.equal(10)
+      expect(pattern.settings.length).to.equal(10)
+      expect(pattern.parts[9].test.paths.test.ops[1].to.y).to.equal(216)
+    })
+
+    it('Should log an error when sampling an undefined measurement', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: { pct: 50, min: 20, max: 80 },
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { },
+        sample: {
+          type: 'measurement',
+          measurement: 'head'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores[0].logs.error.length).to.equal(1)
+      expect(pattern.stores[0].logs.error[0]).to.equal("Cannot sample measurement `head` because it's `undefined`")
+    })
+
+    it('Should sample models', () => {
+      const part = {
+        name: 'test',
+        measurements: ['head'],
+        options: {
+          size: { pct: 50, min: 20, max: 80 },
+        },
+        draft: ({ Point, paths, Path, measurements, options, part }) => {
+          paths.test = new Path()
+            .move(new Point(0,0))
+            .line(new Point(0, measurements.head * options.size))
+
+          return part
+        },
+      }
+      const Pattern = new Design({ parts: [part] })
+      const pattern = new Pattern({
+        measurements: { head: 400 },
+        sample: {
+          type: 'models',
+          models: {
+            a: { head: 100 },
+            b: { head: 200 },
+            c: { head: 300 },
+            d: { head: 400 },
+          },
+          focus: 'c'
+        }
+      })
+      pattern.sample()
+      expect(pattern.stores.length).to.equal(4)
+      expect(pattern.settings.length).to.equal(4)
+      expect(pattern.parts[3].test.paths.test.ops[1].to.y).to.equal(200)
     })
 
     /*
-    it('Should sample an option', () => {
-      let pattern = new Pattern({
-        options: {
-          len: { pct: 30, min: 10 },
-          bonus: 10,
-        },
-      })
-      pattern.draft = function () {
-        pattern.parts.a = new pattern.Part()
-        pattern.parts.b = new pattern.Part()
-        let a = pattern.parts.a
-        a.points.from = new a.Point(0, 0)
-        a.points.to = new a.Point(
-          100 * a.context.settings.options.len,
-          a.context.settings.options.bonus
-        )
-        a.paths.test = new a.Path().move(a.points.from).line(a.points.to)
-        pattern.parts.b.inject(a)
-      }
-      pattern.settings.sample = {
-        type: 'option',
-        option: 'len',
-      }
-      pattern.sample()
-      expect(pattern.parts.a.paths.test_1.render).to.equal(true)
-      expect(pattern.parts.b.paths.test_10.ops[1].to.y).to.equal(10)
-    })
     it("Should sample a list option", () => {
       const front = {
         name: 'front',
diff --git a/packages/core/tests/snippet.test.mjs b/packages/core/tests/snippet.test.mjs
index 4bd3a46c335..d6de391b53c 100644
--- a/packages/core/tests/snippet.test.mjs
+++ b/packages/core/tests/snippet.test.mjs
@@ -1,5 +1,5 @@
 import chai from 'chai'
-import { Snippet, Point } from '../src/index.mjs'
+import { Design, Snippet, Point } from '../src/index.mjs'
 
 const expect = chai.expect
 
@@ -26,4 +26,22 @@ describe('Snippet', () => {
     s.attr('class', 'less', true)
     expect(s.attributes.get('class')).to.equal('less')
   })
+
+  it('Should get a snippet via the snippets proxy', () => {
+    let result
+    const part = {
+      name: 'test',
+      draft: ({ snippets, part }) => {
+        snippets.test = ':)'
+        result = snippets.test
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design()
+    pattern.draft()
+    expect(result).to.equal(':)')
+  })
+
 })
diff --git a/packages/core/tests/stacks.test.mjs b/packages/core/tests/stacks.test.mjs
index 33545c67c55..cc3871ef54d 100644
--- a/packages/core/tests/stacks.test.mjs
+++ b/packages/core/tests/stacks.test.mjs
@@ -4,6 +4,7 @@ import { Design } from '../src/index.mjs'
 const expect = chai.expect
 
 describe('Stacks', () => {
+
   describe('Pattern.init()', () => {
     const partA = {
       name: 'test.partA',
@@ -52,7 +53,6 @@ describe('Stacks', () => {
         paths.line = new Path().move(points.from).line(points.to)
         return part
       },
-      //  stack: 'box',
     }
 
     const Pattern = new Design({
@@ -68,8 +68,6 @@ describe('Stacks', () => {
       },
     })
     pattern.draft()
-    //console.log(pattern.parts)
-    //pattern.render()
 
     it('Pattern.init() should resolve dependencies', () => {
       expect(typeof pattern.config.resolvedDependencies).to.equal('object')
@@ -104,6 +102,7 @@ describe('Stacks', () => {
       pattern.draft().render()
       expect(pattern.stacks.test.topLeft.x).to.equal(17)
       expect(pattern.stacks.test.topLeft.y).to.equal(74)
+      pattern.render()
       expect(pattern.stacks.test.bottomRight.x).to.equal(125)
       expect(pattern.stacks.test.bottomRight.y).to.equal(458)
       expect(pattern.stacks.test.width).to.equal(108)
@@ -149,7 +148,8 @@ describe('Stacks', () => {
       expect(pattern.stacks.test.topLeft.x).to.equal(9)
       expect(pattern.stacks.test.topLeft.y).to.equal(66)
     })
-    it('Should generate the part transforms', () => {
+
+    it('Should generate the stack transforms', () => {
       const part = {
         name: 'test',
         draft: ({ points, Point, paths, Path, part }) => {
@@ -173,4 +173,57 @@ describe('Stacks', () => {
       expect(pattern.stacks.test.attributes.list.transform[0]).to.equal('translate(10 20)')
     })
   })
+
+  it('Should get the anchor for the stack', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.anchor = new Point(2, 2)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design()
+    pattern.draft().render()
+    const anchor = pattern.stacks.test.getAnchor()
+    expect(anchor.name).to.equal('anchor')
+    expect(anchor.x).to.equal(2)
+    expect(anchor.y).to.equal(2)
+  })
+
+  it('Should get the gridAnchor for the stack', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.gridAnchor = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design()
+    pattern.draft().render()
+    const anchor = pattern.stacks.test.getAnchor()
+    expect(anchor.name).to.equal('gridAnchor')
+    expect(anchor.x).to.equal(3)
+    expect(anchor.y).to.equal(3)
+  })
+
+  it('Should get the default aAnchor for the stack', () => {
+    const part = {
+      name: 'test',
+      draft: ({ points, Point, paths, Path, part }) => {
+        points.test = new Point(3, 3)
+
+        return part
+      },
+    }
+    const design = new Design({ parts: [part] })
+    const pattern = new design()
+    pattern.draft().render()
+    const anchor = pattern.stacks.test.getAnchor()
+    expect(anchor.x).to.equal(0)
+    expect(anchor.y).to.equal(0)
+  })
 })
diff --git a/packages/core/tests/store.test.mjs b/packages/core/tests/store.test.mjs
index 1926c710af7..4d1e65e3b6b 100644
--- a/packages/core/tests/store.test.mjs
+++ b/packages/core/tests/store.test.mjs
@@ -106,4 +106,52 @@ describe('Store', () => {
     expect(pattern.stores[0].get('test.example_part.a')).to.equal('hello A')
     expect(pattern.stores[0].get('test.example_part.b')).to.equal('hello B')
   })
+
+  it('Should log a warning when trying to extend a protected method via the constructor', () => {
+    const store = new Store([['get', () => false]])
+    expect(store.logs.warning.length).to.equal(1)
+    expect(store.logs.warning[0]).to.equal('You cannot overwrite store.get()')
+  })
+
+  it('Should log a warning when trying to extend a protected method via the extend', () => {
+    const store = new Store()
+    store.extend([['get', () => false]])
+    expect(store.logs.warning.length).to.equal(1)
+    expect(store.logs.warning[0]).to.equal('You cannot overwrite store.get()')
+  })
+
+  it('Should extend the store with a new method via the constructor', () => {
+    const store = new Store([['test', () => true]])
+    expect(store.test()).to.equal(true)
+  })
+
+  it('Should log a warning when pushing to a non-array key', () => {
+    const store = new Store()
+    store.push('test',1)
+    expect(store.logs.warning.length).to.equal(1)
+    expect(store.logs.warning[0]).to.equal('Store.push(value) on key `test`, but key does not hold an array')
+  })
+
+  it('Should log a warning when setting an undefined value with set()', () => {
+    const store = new Store()
+    store.set('test')
+    expect(store.logs.warning.length).to.equal(1)
+    expect(store.logs.warning[0]).to.equal('Store.set(value) on key `test`, but value is undefined')
+  })
+
+  it('Should log a warning when setting an undefined value with setIfUnset()', () => {
+    const store = new Store()
+    store.setIfUnset('test')
+    expect(store.logs.warning.length).to.equal(1)
+    expect(store.logs.warning[0]).to.equal('Store.setIfUnset(value) on key `test`, but value is undefined')
+  })
+
+  it('Should unset a value', () => {
+    const store = new Store()
+    store.set('test', 1980)
+    expect(store.get('test')).to.equal(1980)
+    store.unset('test')
+    expect(typeof store.get('test')).to.equal('undefined')
+  })
+
 })
diff --git a/packages/core/tests/svg.test.mjs b/packages/core/tests/svg.test.mjs
index d44992df897..c5237210579 100644
--- a/packages/core/tests/svg.test.mjs
+++ b/packages/core/tests/svg.test.mjs
@@ -275,21 +275,4 @@ describe('Svg', () => {
     expect(svg.__tab()).to.equal('    ')
   })
 
-  /*
-  it('Should not render an Svg path when render property is false', () => {
-    let pattern = new Pattern()
-    pattern.render()
-    pattern.parts.test = new pattern.Part()
-    let p = pattern.parts.test
-    p.paths.test = new p.Path()
-      .move(new p.Point(0, 0))
-      .line(new p.Point(40, 20))
-      .curve(new p.Point(12, 34), new p.Point(56, 78), new p.Point(21, 32))
-      .close()
-      .attr('id', 'something')
-      .attr('class', 'freesewing')
-    p.paths.test.render = false
-    expect(pattern.render()).to.equalIgnoreSpaces(render.part)
-  })
-*/
 })