Merge test suite.
diff --git a/testsuite/dd/dd-accepts-of b/testsuite/dd/dd-accepts-of
new file mode 100644
index 0000000..84405e6
--- /dev/null
+++ b/testsuite/dd/dd-accepts-of
@@ -0,0 +1,2 @@
+echo I WANT | busybox dd of=foo 2>/dev/null
+echo I WANT | cmp foo -