diff --git a/tests/helpers.py b/tests/helpers.py
index 2fd7a1a..fac0dda 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -59,6 +59,10 @@ def write(self, data):
             else:
                 f.write(data.decode('UTF-8'))
 
+    def flush(self):
+        for f in self.args:
+            f.flush()
+
 
 class TempProject(object):
     """Represents a dummy-Android project in a temporary directory that