only test passes

index.js

@@ -61,5 +61,13 @@ function createHarness (conf_) {
         return results;
     };
 
+    var only = false;
+    test.only = function (name) {
+        if (only) throw new Error('there can only be one only test');
+        results.only(name);
+        only = true;
+        return test.apply(null, arguments);
+    };
+
     return test;
 }

lib/results.js

@@ -6,14 +6,18 @@ var nextTick = typeof setImmediate !== 'undefined'
     : process.nextTick
 ;
 
-module.exports = function (test) {
+module.exports = function () {
     var output = through();
     output.pause();
     output.queue('TAP version 13\n');
 
     var results = new Results(output);
     output.push = function (t) { results.push(t) };
 
+    output.only = function (name) {
+        results.only = name;
+    };
+
     nextTick(function next () {
         var t = results.tests.shift();
         if (!t && results.running) return;
@@ -37,6 +41,13 @@ Results.prototype.push = function (t, parentT) {
     var self = this;
     var write = function (s) { self.stream.queue(s) };
     t.once('prerun', function () {
+        if (self.only && self.only !== t.name && !parentT) {
+            var nt = self.tests.shift();
+            if (nt) nt.run()
+            else self.close();
+            return;
+        }
+
         self.running ++;
         write('# ' + t.name + '\n');
     });