diff --git a/testing/btest/bifs/do_find_str.zeek b/testing/btest/bifs/do_find_str.zeek
new file mode 100644
index 0000000000..b598b5c73a
--- /dev/null
+++ b/testing/btest/bifs/do_find_str.zeek
@@ -0,0 +1,22 @@
+#
+# @TEST-EXEC: zeek -b %INPUT >out
+# @TEST-EXEC: btest-diff out
+
+event zeek_init()
+	{
+	local a = "this is the concatenation of HTTP fields of the fOrM of the website that I am protecting";
+	local b = "form";
+	local c = "FORM";
+	local d = "FoRm";
+	local e = "om0";
+	local f = "f0rm";
+	local g = "fOrm";
+
+
+	print find_str(a, b, 0, -1, F);
+	print find_str(a, c, 0, -1, F);
+	print find_str(a, d, 0, -1, F);
+	print find_str(a, e, 0, -1, F);
+	print find_str(a, f, 0, -1, F);
+	print find_str(a, g, 0, -1, F);
+	}