Do not expose getRootNodeInternal

Author: koba04

packages/enzyme-test-suite/package.json

@@ -49,4 +49,4 @@
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-react": "^7.6.1"
   }
-}
+}

packages/enzyme/src/ShallowWrapper.js

@@ -97,6 +97,10 @@ function getRootNode(node) {
   return node.rendered;
 }
 
+function getRootNodeInternal(wrapper) {
+  return wrapper[ROOT][NODE];
+}
+
 function privateSetNodes(wrapper, nodes) {
   if (!Array.isArray(nodes)) {
     privateSet(wrapper, NODE, nodes);
@@ -150,10 +154,6 @@ class ShallowWrapper {
     return this[ROOT];
   }
 
-  getRootNodeInternal() {
-    return this[ROOT][NODE];
-  }
-
   getNodeInternal() {
     if (this.length !== 1) {
       throw new Error('ShallowWrapper::getNode() can only be called when wrapping one node');
@@ -803,7 +803,7 @@ class ShallowWrapper {
    * @returns {ShallowWrapper}
    */
   parents(selector) {
-    const allParents = this.wrap(this.single('parents', n => parentsOfNode(n, this.getRootNodeInternal())));
+    const allParents = this.wrap(this.single('parents', n => parentsOfNode(n, getRootNodeInternal(this))));
     return selector ? allParents.filter(selector) : allParents;
   }