Merge test suite.
diff --git a/testsuite/dirname/dirname-handles-multiple-slashes b/testsuite/dirname/dirname-handles-multiple-slashes
new file mode 100644
index 0000000..286f253
--- /dev/null
+++ b/testsuite/dirname/dirname-handles-multiple-slashes
@@ -0,0 +1 @@
+test $(busybox dirname foo/bar///baz) = foo/bar