From 9666676766bf21364f4fc4d0d1d336e72f2a91b4 Mon Sep 17 00:00:00 2001
From: historia <[not public]>
Date: Tue, 6 Oct 2026 12:57:23 -0400
Subject: refactor: split casino.go, dedup helpers, remove audit docs

---
 internal/net/iac_test.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'internal/net/iac_test.go')

diff --git a/internal/net/iac_test.go b/internal/net/iac_test.go
index 71570db..6f91f19 100644
--- a/internal/net/iac_test.go
+++ b/internal/net/iac_test.go
@@ -15,3 +15,18 @@ func TestStripIACDropsTruncatedSequence(t *testing.T) {
 		t.Fatalf("stripIAC(subnegotiation) = %q, want xy", got)
 	}
 }
+
+func TestStripIACPreservesInputAfterTwoByteCommand(t *testing.T) {
+	// A 2-byte command (NOP) in the middle must not eat the following byte.
+	if got := stripIAC("a" + string([]byte{iac, 0xf1}) + "b"); got != "ab" {
+		t.Fatalf("stripIAC(mid two-byte command) = %q, want %q", got, "ab")
+	}
+	// A 3-byte negotiation command consumes its option byte.
+	if got := stripIAC("a" + string([]byte{iac, will, echo}) + "b"); got != "ab" {
+		t.Fatalf("stripIAC(three-byte command) = %q, want %q", got, "ab")
+	}
+	// IAC IAC is an escaped literal 0xFF, not a command.
+	if got := stripIAC("a" + string([]byte{iac, iac}) + "b"); got != "a"+string([]byte{iac})+"b" {
+		t.Fatalf("stripIAC(escaped IAC) = %q, want literal 0xFF", got)
+	}
+}
-- 
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