diff --git a/src/shared/merge.js b/src/shared/merge.js
index 4a64709..ced8de3 100644
--- a/src/shared/merge.js
+++ b/src/shared/merge.js
@@ -25,8 +25,8 @@ export function arrayMerge({ component, tagIDKeyName, metaTemplateKeyName, conte
     }
 
     // when sourceItem explictly defines contentKeyName or innerHTML as undefined, its
-    // an indication that we need to skip the default behaviour
-    // So we keep the targetItem and ignore/remove the sourceItem
+    // an indication that we need to skip the default behaviour or child has preference over parent
+    // which means we keep the targetItem and ignore/remove the sourceItem
     if ((sourceItem.hasOwnProperty(contentKeyName) && sourceItem[contentKeyName] === undefined) ||
       (sourceItem.hasOwnProperty('innerHTML') && sourceItem.innerHTML === undefined)) {
       destination.push(targetItem)
diff --git a/test/components.test.js b/test/components.test.js
index 21d4e95..5742836 100644
--- a/test/components.test.js
+++ b/test/components.test.js
@@ -109,22 +109,23 @@ describe('client', () => {
   })
 
   test('changed function is called', async () => {
-    const parentComponent = new Vue({ render: h => h('div') })
-    const wrapper = mount(Changed, { localVue: Vue, parentComponent })
-
-    await vmTick(wrapper.vm)
-    expect(wrapper.vm.$root._vueMeta.initialized).toBe(true)
-
     let context
     const changed = jest.fn(function () {
       context = this
     })
-    wrapper.setData({ changed, childVisible: true })
+
+    const wrapper = mount(Changed, { localVue: Vue, propsData: { changed } })
+
+    await vmTick(wrapper.vm)
+    expect(wrapper.vm.$root._vueMeta.initialized).toBe(true)
+    // TODO: does changed need to run on initialization?
+    expect(changed).toHaveBeenCalledTimes(1)
+
+    wrapper.setData({ childVisible: true })
     jest.runAllTimers()
 
-    expect(changed).toHaveBeenCalledTimes(1)
-    // TODO: this isnt what the docs say
-    expect(context._uid).not.toBe(wrapper.vm._uid)
+    expect(changed).toHaveBeenCalledTimes(2)
+    expect(context._uid).toBe(wrapper.vm._uid)
   })
 
   test('afterNavigation function is called', () => {
@@ -136,15 +137,19 @@ describe('client', () => {
     })
 
     const guards = {}
-    Vue.prototype.$router = {
-      beforeEach(fn) {
-        guards.before = fn
-      },
-      afterEach(fn) {
-        guards.after = fn
+    const wrapper = mount(component, {
+      localVue: Vue,
+      mocks: {
+        $router: {
+          beforeEach(fn) {
+            guards.before = fn
+          },
+          afterEach(fn) {
+            guards.after = fn
+          }
+        }
       }
-    }
-    const wrapper = mount(component, { localVue: Vue })
+    })
 
     expect(guards.before).toBeDefined()
     expect(guards.after).toBeDefined()
diff --git a/test/fixtures/changed.vue b/test/fixtures/changed.vue
index 20a6de5..4d2c02d 100644
--- a/test/fixtures/changed.vue
+++ b/test/fixtures/changed.vue
@@ -11,16 +11,24 @@ export default {
   components: {
     HelloWorld
   },
+  props: {
+    changed: {
+      type: Function
+    }
+  },
   metaInfo() {
     return {
-      changed: this.changed
+      changed: this._changed
     }
   },
   data() {
     return {
       childVisible: false,
-      changed: () => {}
+      _changed: () => {}
     }
+  },
+  mounted() {
+    this._changed = this.changed.bind(this)
   }
 }
 </script>
diff --git a/test/getMetaInfo.test.js b/test/getMetaInfo.test.js
index 55592ac..8a822ff 100644
--- a/test/getMetaInfo.test.js
+++ b/test/getMetaInfo.test.js
@@ -483,8 +483,6 @@ describe('getMetaInfo', () => {
     })
   })
 
-  // TODO: Still failing :( Child template won't be applied if child has no content as well
-
   test('properly uses meta templates with one-level-deep nested children template', () => {
     Vue.component('merge-child', {
       render: h => h('div'),
diff --git a/test/shared.test.js b/test/shared.test.js
new file mode 100644
index 0000000..57d70a2
--- /dev/null
+++ b/test/shared.test.js
@@ -0,0 +1,64 @@
+/**
+ * @jest-environment node
+ */
+import { ensureIsArray } from '../src/shared/ensure'
+import setOptions from '../src/shared/options'
+import { hasGlobalWindowFn } from '../src/shared/window'
+import { defaultOptions } from './utils/constants'
+
+const noop = () => {}
+
+describe('shared', () => {
+  test('ensureIsArray ensures var is array', () => {
+    let a = { p: 1 }
+    expect(ensureIsArray(a)).toEqual([])
+
+    a = 1
+    expect(ensureIsArray(a)).toEqual([])
+
+    a = [1]
+    expect(ensureIsArray(a)).toBe(a)
+  })
+
+  test('ensureIsArray ensures obj prop is array', () => {
+    const a = { p: 1 }
+    expect(ensureIsArray(a, 'p')).toEqual({ p: [] })
+  })
+
+  test('no error when window is not defined', () => {
+    expect(hasGlobalWindowFn()).toBe(false)
+  })
+
+  test('can use setOptions', () => {
+    const keyName = 'MY KEY'
+    let options = { keyName }
+    options = setOptions(options)
+
+    expect(options.keyName).toBe(keyName)
+    expect(options.contentKeyName).toBeDefined()
+    expect(options.contentKeyName).toBe(defaultOptions.contentKeyName)
+  })
+
+  test('setOptions warns when afterNavigation not fn', () => {
+    const warn = jest.spyOn(console, 'warn').mockImplementation(noop)
+
+    let options = { afterNavigation: true }
+    options = setOptions(options)
+
+    expect(warn).toHaveBeenCalledTimes(1)
+    expect(options.afterNavigation).toBeUndefined()
+
+    warn.mockRestore()
+  })
+  test('setOptions sets refreshOnceOnNavigation when afterNavigation defined', () => {
+    const warn = jest.spyOn(console, 'warn').mockImplementation(noop)
+
+    let options = { afterNavigation: noop }
+    options = setOptions(options)
+
+    expect(warn).not.toHaveBeenCalled()
+    expect(options.refreshOnceOnNavigation).toBe(true)
+
+    warn.mockRestore()
+  })
+})
diff --git a/test/utils/constants.js b/test/utils/constants.js
new file mode 100644
index 0000000..a1b60bb
--- /dev/null
+++ b/test/utils/constants.js
@@ -0,0 +1,17 @@
+import {
+  keyName,
+  attribute,
+  ssrAttribute,
+  tagIDKeyName,
+  metaTemplateKeyName,
+  contentKeyName
+} from '../../src/shared/constants'
+
+export const defaultOptions = {
+  keyName,
+  attribute,
+  ssrAttribute,
+  tagIDKeyName,
+  metaTemplateKeyName,
+  contentKeyName
+}