test: popper mocks, test runner fix

Author: adamberecz

src/composables/useDropdown.js

@@ -1,7 +1,7 @@
 import { ref, toRefs, getCurrentInstance, computed, onMounted, onBeforeUnmount, nextTick } from 'vue'
-import { createPopper } from '@popperjs/core/lib/popper-lite.js'
-import preventOverflow from '@popperjs/core/lib/modifiers/preventOverflow.js'
-import flip from '@popperjs/core/lib/modifiers/flip.js'
+import { createPopper } from '@popperjs/core/lib/popper-lite'
+import preventOverflow from '@popperjs/core/lib/modifiers/preventOverflow'
+import flip from '@popperjs/core/lib/modifiers/flip'
 
 export default function useDropdown (props, context, dep)
 {
@@ -104,6 +104,7 @@ export default function useDropdown (props, context, dep)
  return
  }
 
+ /* istanbul ignore next: popper mock */
  popper.value = createPopper(multiselect.value, dropdown.value, {
  strategy: hasFixedParent(multiselect.value) ? /* istanbul ignore next: UI feature */ 'fixed' : undefined,
  placement: openDirection.value,

tests/unit/__mocks__/@popperjs/core/lib/modifiers/flip.js

@@ -0,0 +1 @@
+export default {}

tests/unit/__mocks__/@popperjs/core/lib/modifiers/preventOverflow.js

@@ -0,0 +1 @@
+export default {}

tests/unit/__mocks__/@popperjs/core/lib/popper-lite.js

@@ -0,0 +1,21 @@
+const createPopper = function (ref, el, options) {
+ const popper = {
+ setOptions: (cb) => {
+ let newOps = cb(options)
+
+ popper.state.placement = newOps.placement
+ },
+ update: () => {},
+ destroy: () => {},
+ state: {
+ placement: options.placement
+ },
+ options,
+ }
+
+ return popper
+}
+
+export {
+ createPopper,
+}