Merge test suite.
diff --git a/testsuite/grep/grep-is-also-egrep b/testsuite/grep/grep-is-also-egrep
new file mode 100644
index 0000000..f28afda
--- /dev/null
+++ b/testsuite/grep/grep-is-also-egrep
@@ -0,0 +1,2 @@
+# UNSUPPORTED: CONFIG_FEATURE_GREP_EGREP_ALIAS
+echo foo | busybox egrep foo