doc: clarify dns.lookup callback signature when options.all is enabled

doc/api/dns.md

@@ -277,19 +277,20 @@ changes:
 * `callback` {Function}
   * `err` {Error}
   * `address` {string} A string representation of an IPv4 or IPv6 address.
+    This argument is only provided when `options.all` is `false`.
   * `family` {integer} `4` or `6`, denoting the family of `address`, or `0` if
     the address is not an IPv4 or IPv6 address. `0` is a likely indicator of a
-    bug in the name resolution service used by the operating system.
+    bug in the name resolution service used by the operating system. This
+    argument is only provided when `options.all` is `false`.
+  * `addresses` {Object[]} Returned when `options.all` is `true`.
+    * `address` {string} A resolved IPv4 or IPv6 address.
+    * `family` {integer} `4` or `6`, denoting the family of `address`.
 
 Resolves a host name (e.g. `'nodejs.org'`) into the first found A (IPv4) or
 AAAA (IPv6) record. All `option` properties are optional. If `options` is an
 integer, then it must be `4` or `6` – if `options` is not provided, then
 either IPv4 or IPv6 addresses, or both, are returned if found.
 
-With the `all` option set to `true`, the arguments for `callback` change to
-`(err, addresses)`, with `addresses` being an array of objects with the
-properties `address` and `family`.
-
 On error, `err` is an [`Error`][] object, where `err.code` is the error code.
 Keep in mind that `err.code` will be set to `'ENOTFOUND'` not only when
 the host name does not exist but also when the lookup fails in other ways

doc/api/test.md

@@ -2460,6 +2460,29 @@ test('spies on an object method', (t) => {
 });
 ```
 
+The same approach can be used to mock a method that throws and verify the
+error with [`assert.throws()`][]:
+
+```js
+test('mocks a method that throws', (t) => {
+  const number = {
+    value: 5,
+    subtract(a) {
+      return this.value - a;
+    },
+  };
+
+  t.mock.method(number, 'subtract', () => {
+    throw new Error('boom');
+  });
+
+  assert.throws(() => number.subtract(3), {
+    message: 'boom',
+  });
+});
+```
+
+
 ### `mock.module(specifier[, options])`
 
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