diff --git a/lib/internal/test_runner/mock/mock.js b/lib/internal/test_runner/mock/mock.js
index a704b41996e6d2..838a530ddd4902 100644
--- a/lib/internal/test_runner/mock/mock.js
+++ b/lib/internal/test_runner/mock/mock.js
@@ -45,19 +45,36 @@ class MockFunctionContext {
     this.#times = times;
   }
 
+  /**
+   * Gets an array of recorded calls made to the mock function.
+   * @returns {Array} An array of recorded calls.
+   */
   get calls() {
     return ArrayPrototypeSlice(this.#calls, 0);
   }
 
+  /**
+   * Retrieves the number of times the mock function has been called.
+   * @returns {number} The call count.
+   */
   callCount() {
     return this.#calls.length;
   }
 
+  /**
+   * Sets a new implementation for the mock function.
+   * @param {Function} implementation - The new implementation for the mock function.
+   */
   mockImplementation(implementation) {
     validateFunction(implementation, 'implementation');
     this.#implementation = implementation;
   }
 
+  /**
+   * Replaces the implementation of the function only once.
+   * @param {Function} implementation - The substitute function.
+   * @param {number} [onCall] - The call index to be replaced.
+   */
   mockImplementationOnce(implementation, onCall) {
     validateFunction(implementation, 'implementation');
     const nextCall = this.#calls.length;
@@ -66,6 +83,9 @@ class MockFunctionContext {
     this.#mocks.set(call, implementation);
   }
 
+  /**
+   * Restores the original function that was mocked.
+   */
   restore() {
     const { descriptor, object, original, methodName } = this.#restore;
 
@@ -79,14 +99,25 @@ class MockFunctionContext {
     }
   }
 
+  /**
+   * Resets the recorded calls to the mock function
+   */
   resetCalls() {
     this.#calls = [];
   }
 
+  /**
+   * Tracks a call made to the mock function.
+   * @param {object} call - The call details.
+   */
   trackCall(call) {
     ArrayPrototypePush(this.#calls, call);
   }
 
+  /**
+   * Gets the next implementation to use for the mock function.
+   * @returns {Function} The next implementation.
+   */
   nextImpl() {
     const nextCall = this.#calls.length;
     const mock = this.#mocks.get(nextCall);
@@ -109,11 +140,23 @@ class MockTracker {
   #mocks = [];
   #timers;
 
+  /**
+   * Returns the mock timers of this MockTracker instance.
+   * @returns {MockTimers} The mock timers instance.
+   */
   get timers() {
     this.#timers ??= new MockTimers();
     return this.#timers;
   }
 
+  /**
+   * Creates a mock function tracker.
+   * @param {Function} [original] - The original function to be tracked.
+   * @param {Function} [implementation] - An optional replacement function for the original one.
+   * @param {object} [options] - Additional tracking options.
+   * @param {number} [options.times=Infinity] - The maximum number of times the mock function can be called.
+   * @returns {ProxyConstructor} The mock function tracker.
+   */
   fn(
     original = function() {},
     implementation = original,
@@ -137,6 +180,17 @@ class MockTracker {
     return this.#setupMock(ctx, original);
   }
 
+  /**
+   * Creates a method tracker for a specified object or function.
+   * @param {(object | Function)} objectOrFunction - The object or function containing the method to be tracked.
+   * @param {string} methodName - The name of the method to be tracked.
+   * @param {Function} [implementation] - An optional replacement function for the original method.
+   * @param {object} [options] - Additional tracking options.
+   * @param {boolean} [options.getter=false] - Indicates whether this is a getter method.
+   * @param {boolean} [options.setter=false] - Indicates whether this is a setter method.
+   * @param {number} [options.times=Infinity] - The maximum number of times the mock method can be called.
+   * @returns {ProxyConstructor} The mock method tracker.
+   */
   method(
     objectOrFunction,
     methodName,
@@ -216,6 +270,18 @@ class MockTracker {
     return mock;
   }
 
+  /**
+   * Mocks a getter method of an object.
+   * This is a syntax sugar for the MockTracker.method with options.getter set to true
+   * @param {object} object - The target object.
+   * @param {string} methodName - The name of the getter method to be mocked.
+   * @param {Function} [implementation] - An optional replacement function for the targeted method.
+   * @param {object} [options] - Additional tracking options.
+   * @param {boolean} [options.getter=true] - Indicates whether this is a getter method.
+   * @param {boolean} [options.setter=false] - Indicates whether this is a setter method.
+   * @param {number} [options.times=Infinity] - The maximum number of times the mock method can be called.
+   * @returns {ProxyConstructor} The mock method tracker.
+   */
   getter(
     object,
     methodName,
@@ -244,6 +310,18 @@ class MockTracker {
     });
   }
 
+  /**
+   * Mocks a setter method of an object.
+   * This function is a syntax sugar for MockTracker.method with options.setter set to true.
+   * @param {object} object - The target object.
+   * @param {string} methodName  - The setter method to be mocked.
+   * @param {Function} [implementation] - An optional replacement function for the targeted method.
+   * @param {object} [options] - Additional tracking options.
+   * @param {boolean} [options.getter=false] - Indicates whether this is a getter method.
+   * @param {boolean} [options.setter=true] - Indicates whether this is a setter method.
+   * @param {number} [options.times=Infinity] - The maximum number of times the mock method can be called.
+   * @returns {ProxyConstructor} The mock method tracker.
+   */
   setter(
     object,
     methodName,
@@ -272,12 +350,18 @@ class MockTracker {
     });
   }
 
+  /**
+   * Resets the mock tracker, restoring all mocks and clearing timers.
+   */
   reset() {
     this.restoreAll();
     this.#timers?.reset();
     this.#mocks = [];
   }
 
+  /**
+   * Restore all mocks created by this MockTracker instance.
+   */
   restoreAll() {
     for (let i = 0; i < this.#mocks.length; i++) {
       FunctionPrototypeCall(restore, this.#mocks[i]);