1 files changed, 42 insertions, 0 deletions
diff --git a/node_modules/events/tests/common.js b/node_modules/events/tests/common.js
new file mode 100644
index 000000000..66f70a390
--- /dev/null
+++ b/node_modules/events/tests/common.js
@@ -0,0 +1,42 @@
+var assert = require('assert');
+
+var mustCallChecks = [];
+
+function runCallChecks() {
+  var failed_count = 0;
+  for (var i=0 ; i< mustCallChecks.length; ++i) {
+    var context = mustCallChecks[i];
+    if (context.actual === context.expected) {
+      continue;
+    }
+
+    failed_count++;
+    console.log('Mismatched %s function calls. Expected %d, actual %d.',
+                context.name,
+                context.expected,
+                context.actual);
+    console.log(context.stack.split('\n').slice(2).join('\n'));
+  }
+
+  assert(failed_count === 0);
+}
+
+after(runCallChecks);
+
+exports.mustCall = function(fn, expected) {
+  if (typeof expected !== 'number') expected = 1;
+
+  var context = {
+    expected: expected,
+    actual: 0,
+    stack: (new Error).stack,
+    name: fn.name || '<anonymous>'
+  };
+
+  mustCallChecks.push(context);
+
+  return function() {
+    context.actual++;
+    return fn.apply(this, arguments);
+  };
+};