From ab38e5f8fe6074fe2cdc2e49c201105e77d3c62d Mon Sep 17 00:00:00 2001
From: Hayleigh Thompson <me@hayleigh.dev>
Date: Fri, 17 Jul 2026 01:13:12 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9A=97=EF=B8=8F=20Set=20up=20basic=20syntax?=
 =?UTF-8?q?=20interop=20tests=20for=20tids.?=
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---
 test/at/tid_test.gleam | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 test/at/tid_test.gleam

diff --git a/test/at/tid_test.gleam b/test/at/tid_test.gleam
new file mode 100644
index 0000000..ca545fa
--- /dev/null
+++ b/test/at/tid_test.gleam
@@ -0,0 +1,37 @@
+// IMPORTS ---------------------------------------------------------------------
+
+import at/tid
+import gleam/list
+
+// FIXTURES --------------------------------------------------------------------
+
+const valid = [
+  "3jzfcijpj2z2a",
+  "7777777777777",
+  "3zzzzzzzzzzzz",
+]
+
+const invalid = [
+  "3jzfcijpj2z21",
+  "0000000000000",
+  "3jzfcijpj2z2aa",
+  "3jzfcijpj2z2",
+  "3jzf-cij-pj2z-2a",
+  "zzzzzzzzzzzzz",
+  "kjzfcijpj2z2a",
+]
+
+// INTEROP TESTS ---------------------------------------------------------------
+
+pub fn atproto_interop_valid_tid_test() {
+  use input <- list.each(valid)
+  let assert Ok(tid) = tid.from_string(input) as input
+
+  assert tid.to_string(tid) == input
+}
+
+pub fn atproto_interop_invalid_tid_test() {
+  use input <- list.each(invalid)
+
+  assert tid.from_string(input) == Error(Nil) as input
+}
-- 
2.51.2