failing undef test

test/undef.js

@@ -0,0 +1,32 @@
+var tape = require('../');
+var tap = require('tap');
+var concat = require('concat-stream');
+
+tap.test('array test', function (tt) {
+    tt.plan(1);
+
+    var test = tape.createHarness();
+    test.createStream().pipe(concat(function (body) {
+        tt.equal(
+            body.toString('utf8'),
+            'TAP version 13\n'
+            + '# undef\n'
+            + 'not ok 1 should be equivalent\n'
+            + '  ---\n'
+            + '    operator: deepEqual\n'
+            + '    expected: { beep: undefined }\n'
+            + '    actual:   {}\n'
+            + '  ...\n'
+            + '\n'
+            + '1..1\n'
+            + '# tests 1\n'
+            + '# pass  0\n'
+            + '# fail  1\n'
+        );
+    }));
+
+    test('undef', function (t) {
+        t.plan(1);
+        t.deepEqual({}, { beep: undefined });
+    });
+});