Merge test suite.
diff --git a/testsuite/cp/cp-copies-empty-file b/testsuite/cp/cp-copies-empty-file
new file mode 100644
index 0000000..ad25aa1
--- /dev/null
+++ b/testsuite/cp/cp-copies-empty-file
@@ -0,0 +1,3 @@
+touch foo
+busybox cp foo bar
+cmp foo bar