Merge test suite.
diff --git a/testsuite/basename/basename-does-not-remove-identical-extension b/testsuite/basename/basename-does-not-remove-identical-extension
new file mode 100644
index 0000000..4448fde
--- /dev/null
+++ b/testsuite/basename/basename-does-not-remove-identical-extension
@@ -0,0 +1 @@
+test xfoo = x`busybox basename foo foo`