diff --git a/lib/test.js b/lib/test.js
index 694285f..97dcd4b 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -13,11 +13,18 @@ function Test (result, suite) {
   } else {
     this.state = 'failed'
   }
-  if (result.diag && result.diag.source) {
-    var source = result.diag.source
-    this.fn = {
-      toString: function () {
-        return 'function(){' + source + '\n}'
+  if (result.diag) {
+    if (result.diag.source) {
+      var source = result.diag.source
+      this.fn = {
+        toString: function () {
+          return 'function(){' + source + '\n}'
+        }
+      }
+    } else {
+      this.context = {
+        title: 'diagnostic',
+        value: result.diag,
       }
     }
   }