lib: add getActual as priivate method to Assert class

Author: miguelmarcondesf

lib/assert.js

@@ -364,6 +364,16 @@ class Assert {
     return NO_EXCEPTION_SENTINEL;
   }
 
+  #getActual(fn) {
+    validateFunction(fn, 'fn');
+    try {
+      fn();
+    } catch (e) {
+      return e;
+    }
+    return NO_EXCEPTION_SENTINEL;
+  }
+
   /**
    * Pure assertion tests whether a value is truthy, as determined
    * by !!value.
@@ -662,7 +672,7 @@ class Assert {
    * @returns {void}
    */
   throws(promiseFn, ...args) {
-    this.#expectsError(Assert.prototype.throws, getActual(promiseFn), ...args);
+    this.#expectsError(Assert.prototype.throws, this.#getActual(promiseFn), ...args);
   };
 
   /**
@@ -682,7 +692,7 @@ class Assert {
    * @returns {void}
    */
   doesNotThrow(fn, ...args) {
-    this.#expectsNoError(Assert.prototype.doesNotThrow, getActual(fn), ...args);
+    this.#expectsNoError(Assert.prototype.doesNotThrow, this.#getActual(fn), ...args);
   };
 
   /**
@@ -798,16 +808,6 @@ class Comparison {
   }
 }
 
-function getActual(fn) {
-  validateFunction(fn, 'fn');
-  try {
-    fn();
-  } catch (e) {
-    return e;
-  }
-  return NO_EXCEPTION_SENTINEL;
-}
-
 function checkIsPromise(obj) {
   // Accept native ES6 promises and promises that are implemented in a similar
   // way. Do not accept thenables that use a function as `obj` and that have no