patch(form-core): expose mimicUserInput test-helper

.changeset/green-ads-fold.md

@@ -0,0 +1,5 @@
+---
+'@lion/form-core': patch
+---
+
+form-core: expose 'mimicUserInput' test-helper

packages/form-core/test-helpers/index.js

@@ -1,2 +1,3 @@
 export * from './ExampleValidators.js';
 export * from './getFormControlMembers.js';
+export * from './mimicUserInput.js';

packages/form-core/test-helpers/mimicUserInput.js

@@ -0,0 +1,16 @@
+// @ts-nocheck
+/**
+ * @param {HTMLElement} formControl
+ * @param {?} newViewValue
+ * @param {{caretIndex?:number}} config
+ */
+export function mimicUserInput(formControl, newViewValue, { caretIndex } = {}) {
+  formControl.value = newViewValue; // eslint-disable-line no-param-reassign
+  if (caretIndex) {
+    // eslint-disable-next-line no-param-reassign
+    formControl._inputNode.selectionStart = caretIndex;
+    // eslint-disable-next-line no-param-reassign
+    formControl._inputNode.selectionEnd = caretIndex;
+  }
+  formControl._inputNode.dispatchEvent(new Event('input', { bubbles: true }));
+}