test_runner: add resetCalls to MockFunctionContext

This commit allows tests in test runner to reset
the calls of mock function

Refs: #45326 (comment)
PR-URL: #45710
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Moshe Atlow <[email protected]>
Reviewed-By: Yagiz Nizipli <[email protected]>

Author: fossamagna

doc/api/test.md

@@ -856,6 +856,14 @@ test('changes a mock behavior once', (t) => {
 });
 ```
 
+### `ctx.resetCalls()`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Resets the call history of the mock function.
+
 ### `ctx.restore()`
 
 <!-- YAML

lib/internal/test_runner/mock.js

@@ -77,6 +77,10 @@ class MockFunctionContext {
     }
   }
 
+  resetCalls() {
+    this.#calls = [];
+  }
+
   trackCall(call) {
     ArrayPrototypePush(this.#calls, call);
   }

test/parallel/test-runner-mocking.js

@@ -780,6 +780,23 @@ test('local mocks are auto restored after the test finishes', async (t) => {
   assert.strictEqual(originalBar, obj.bar);
 });
 
+test('reset mock calls', (t) => {
+  const sum = (arg1, arg2) => arg1 + arg2;
+  const difference = (arg1, arg2) => arg1 - arg2;
+  const fn = t.mock.fn(sum, difference);
+
+  assert.strictEqual(fn(1, 2), -1);
+  assert.strictEqual(fn(2, 1), 1);
+  assert.strictEqual(fn.mock.calls.length, 2);
+  assert.strictEqual(fn.mock.callCount(), 2);
+
+  fn.mock.resetCalls();
+  assert.strictEqual(fn.mock.calls.length, 0);
+  assert.strictEqual(fn.mock.callCount(), 0);
+
+  assert.strictEqual(fn(3, 2), 1);
+});
+
 test('uses top level mock', () => {
   function sum(a, b) {
     return a + b;