doc: use mock.callCount() in examples

PR-URL: #53754
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Raz Luvaton <rluvaton@gmail.com>

Author: regseb

doc/api/test.md

@@ -497,9 +497,9 @@ test('spies on a function', () => {
 return a + b;
  });
 
-assert.strictEqual(sum.mock.calls.length, 0);
+assert.strictEqual(sum.mock.callCount(), 0);
 assert.strictEqual(sum(3, 4), 7);
-assert.strictEqual(sum.mock.calls.length, 1);
+assert.strictEqual(sum.mock.callCount(), 1);
 
 constcall=sum.mock.calls[0];
 assert.deepStrictEqual(call.arguments, [3, 4]);
@@ -521,9 +521,9 @@ test('spies on a function', () => {
 return a + b;
  });
 
-assert.strictEqual(sum.mock.calls.length, 0);
+assert.strictEqual(sum.mock.callCount(), 0);
 assert.strictEqual(sum(3, 4), 7);
-assert.strictEqual(sum.mock.calls.length, 1);
+assert.strictEqual(sum.mock.callCount(), 1);
 
 constcall=sum.mock.calls[0];
 assert.deepStrictEqual(call.arguments, [3, 4]);
@@ -551,9 +551,9 @@ test('spies on an object method', (t) => {
  };
 
 t.mock.method(number, 'add');
-assert.strictEqual(number.add.mock.calls.length, 0);
+assert.strictEqual(number.add.mock.callCount(), 0);
 assert.strictEqual(number.add(3), 8);
-assert.strictEqual(number.add.mock.calls.length, 1);
+assert.strictEqual(number.add.mock.callCount(), 1);
 
 constcall=number.add.mock.calls[0];
 
@@ -1854,9 +1854,9 @@ test('spies on an object method', (t) => {
  };
 
 t.mock.method(number, 'subtract');
-assert.strictEqual(number.subtract.mock.calls.length, 0);
+assert.strictEqual(number.subtract.mock.callCount(), 0);
 assert.strictEqual(number.subtract(3), 2);
-assert.strictEqual(number.subtract.mock.calls.length, 1);
+assert.strictEqual(number.subtract.mock.callCount(), 1);
 
 constcall=number.subtract.mock.calls[0];