From b708b2a05fb933c24a97671cdfa5a6a92d723946 Mon Sep 17 00:00:00 2001
From: Chiron <chiron@agentmail.to>
Date: Wed, 15 Apr 2026 18:43:00 +0000
Subject: [PATCH] test: add basic lib function tests for agents and
 coding-rules

---
 tests/lib/agents-test.nix       | 29 ++++++++++++++++++
 tests/lib/coding-rules-test.nix | 53 +++++++++++++++++++++++++++++++++
 tests/lib/default.nix           |  4 +++
 3 files changed, 86 insertions(+)
 create mode 100644 tests/lib/agents-test.nix
 create mode 100644 tests/lib/coding-rules-test.nix
 create mode 100644 tests/lib/default.nix

diff --git a/tests/lib/agents-test.nix b/tests/lib/agents-test.nix
new file mode 100644
index 0000000..6e3b3c0
--- /dev/null
+++ b/tests/lib/agents-test.nix
@@ -0,0 +1,29 @@
+let
+  lib = import <nixpkgs/lib>;
+  agentsLib = (import ../../lib {inherit lib;}).agents;
+
+  # Test 1: renderForTool throws for unknown tools
+  testUnknownTool = let
+    result = builtins.tryEval (
+      agentsLib.renderForTool {
+        pkgs = {};
+        agentsInput = {};
+        tool = "unknown-tool";
+      }
+    );
+  in
+    assert result.success == false;
+    {result = "pass";};
+
+  # Test 2: loadCanonical extracts loadAgents from input
+  testLoadCanonical = let
+    fakeInput = {lib.loadAgents = {test = {description = "test";};};};
+    result = agentsLib.loadCanonical {agentsInput = fakeInput;};
+  in
+    assert result == {test = {description = "test";};};
+    {result = "pass";};
+
+in {
+  unknown-tool-throws = testUnknownTool;
+  load-canonical = testLoadCanonical;
+}
diff --git a/tests/lib/coding-rules-test.nix b/tests/lib/coding-rules-test.nix
new file mode 100644
index 0000000..433b270
--- /dev/null
+++ b/tests/lib/coding-rules-test.nix
@@ -0,0 +1,53 @@
+let
+  lib = import <nixpkgs/lib>;
+  codingRulesLib = (import ../../lib {inherit lib;}).coding-rules;
+
+  # Test 1: instructions are generated correctly with custom rulesDir
+  testInstructions = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+      languages = ["python"];
+      concerns = ["naming"];
+      rulesDir = ".coding-rules";
+    };
+  in
+    assert rules.instructions == [
+      ".coding-rules/concerns/naming.md"
+      ".coding-rules/languages/python.md"
+    ];
+    {result = "pass";};
+
+  # Test 2: default rulesDir is .opencode-rules
+  testDefaultRulesDir = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+    };
+    hasCorrectPrefix = builtins.all (s: builtins.substring 0 15 s == ".opencode-rules") rules.instructions;
+  in
+    assert hasCorrectPrefix == true;
+    {result = "pass";};
+
+  # Test 3: backward-compat alias exists
+  testBackwardCompat =
+    assert codingRulesLib.mkOpencodeRules == codingRulesLib.mkCodingRules;
+    {result = "pass";};
+
+  # Test 4: shellHook contains both the symlink command and the config generation
+  testShellHook = let
+    rules = codingRulesLib.mkCodingRules {
+      agents = "/tmp/fake-agents";
+    };
+    hook = rules.shellHook;
+    hasSymlink = builtins.match ".*ln -sfn.*" hook != null;
+    hasConfigGen = builtins.match ".*coding-rules.json.*" hook != null;
+  in
+    assert hasSymlink;
+    assert hasConfigGen;
+    {result = "pass";};
+
+in {
+  instructions-correct = testInstructions;
+  default-rules-dir = testDefaultRulesDir;
+  backward-compat = testBackwardCompat;
+  shell-hook = testShellHook;
+}
diff --git a/tests/lib/default.nix b/tests/lib/default.nix
new file mode 100644
index 0000000..dc12cad
--- /dev/null
+++ b/tests/lib/default.nix
@@ -0,0 +1,4 @@
+{
+  coding-rules = import ./coding-rules-test.nix;
+  agents = import ./agents-test.nix;
+}