[Fix] match/doesNotMatch: when passing, ensure the proper default assert message shows up

Fixes #494.

Author: ljharb

Diff for: lib/test.js

@@ -556,8 +556,12 @@ Test.prototype.match = function match(string, regexp, msg, extra) {
     }
 
     var matches = $test(regexp, string);
+    var message = defined(
+        msg,
+        'The input ' + (matches ? 'matched' : 'did not match') + ' the regular expression ' + inspect(regexp) + '. Input: ' + inspect(string)
+    );
     this._assert(matches, {
-        message: defined(msg, 'The input did not match the regular expression ' + inspect(regexp) + '. Input: ' + inspect(string)),
+        message: message,
         operator: 'match',
         actual: string,
         expected: regexp,
@@ -573,8 +577,12 @@ Test.prototype.doesNotMatch = function doesNotMatch(string, regexp, msg, extra)
         throw new TypeError('The "string" argument must be of type string. Received type ' + typeof string + ' (' + inspect(string) + ')');
     }
     var matches = $test(regexp, string);
+    var message = defined(
+        msg,
+        'The input ' + (matches ? 'was expected to not match' : 'did not match') + ' the regular expression ' + inspect(regexp) + '. Input: ' + inspect(string)
+    );
     this._assert(!matches, {
-        message: defined(msg, 'The input was expected to not match the regular expression ' + inspect(regexp) + '. Input: ' + inspect(string)),
+        message: message,
         operator: 'doesNotMatch',
         actual: string,
         expected: regexp,

Diff for: test/match.js

@@ -40,7 +40,7 @@ tap.test('match', function (tt) {
             '          at Test.<anonymous> ($TEST/match.js:$LINE:$COL)',
             '          [... stack stripped ...]',
             '  ...',
-            'ok 5 The input did not match the regular expression /pass$/. Input: \'I will pass\'',
+            'ok 5 The input matched the regular expression /pass$/. Input: \'I will pass\'',
             'ok 6 "I will pass" matches /pass$/',
             '',
             '1..6',