Add initial unit testing framework. See #438.

apache2/t/tfns/length.t

@@ -0,0 +1,43 @@
+### Empty
+{
+	type => "tfns",
+	name => "length",
+	input => "",
+	output => "0",
+	ret => 1,
+},
+
+
+### Basic normal and large
+{
+	type => "tfns",
+	name => "length",
+	input => "0123456789abcdef",
+	output => "16",
+	ret => 1,
+},
+{
+	type => "tfns",
+	name => "length",
+	input => ('x' x 8192),
+	output => "8192",
+	ret => 1,
+},
+
+### With TAB
+{
+	type => "tfns",
+	name => "length",
+	input => "0123456789\tabcdef",
+	output => "17",
+	ret => 1,
+},
+
+### With NUL
+{
+	type => "tfns",
+	name => "length",
+	input => "Test\0Case",
+	output => "9",
+	ret => 1,
+},