Add Couple More Tests

Author: guysv

test/test.lua

@@ -81,3 +81,15 @@ test("max length write", function()
     end)
     assert(output == "")
 end)
+
+test("null read", function()
+    with_input("4:\x00\x00\x00\x00,", function(stream)
+        assert(netstring.read(stream) == "\x00\x00\x00\x00")
+    end)
+end)
+
+test("control char read", function()
+    with_input("8::::,:,,,,", function(stream)
+        assert(netstring.read(stream) == ":::,:,,,")
+    end)
+end)