From e7cb0a5dab291d453fa34c5d1250d85e82478ecf Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Sun, 26 Jul 2026 20:45:55 +0200
Subject: kapi: add tracked mutex tests

---
 kernel/kapi/tracked_mutex.cpp       |  5 ---
 kernel/kapi/tracked_mutex.tests.cpp | 79 +++++++++++++++++++++++++++++++++++++
 2 files changed, 79 insertions(+), 5 deletions(-)
 create mode 100644 kernel/kapi/tracked_mutex.tests.cpp

(limited to 'kernel')

diff --git a/kernel/kapi/tracked_mutex.cpp b/kernel/kapi/tracked_mutex.cpp
index 6608169c..b1796adc 100644
--- a/kernel/kapi/tracked_mutex.cpp
+++ b/kernel/kapi/tracked_mutex.cpp
@@ -33,11 +33,6 @@ namespace kapi
       return true;
     }
 
-    if (expected == self)
-    {
-      system::panic("[OS] CPU {} tried to reacquire a mutex it already holds!", self);
-    }
-
     return false;
   }
 
diff --git a/kernel/kapi/tracked_mutex.tests.cpp b/kernel/kapi/tracked_mutex.tests.cpp
new file mode 100644
index 00000000..37493a1b
--- /dev/null
+++ b/kernel/kapi/tracked_mutex.tests.cpp
@@ -0,0 +1,79 @@
+#include <kapi/tracked_mutex.hpp>
+
+#include <kernel/test_support/cpu.hpp>
+
+#include <kstd/mutex.hpp>
+
+#include <catch2/catch_test_macros.hpp>
+
+SCENARIO("Tracked mutex single threaded")
+{
+  GIVEN("a tracked mutex")
+  {
+    auto mutex = kapi::tracked_mutex{};
+
+    WHEN("the current thread hasn't locked the mutex")
+    {
+      THEN("unlocking the mutex panics")
+      {
+        REQUIRE_THROWS_AS(mutex.unlock(), kernel::tests::cpu::halt);
+      }
+
+      THEN("locking the mutex succeeds")
+      {
+        mutex.lock();
+      }
+
+      THEN("locking the mutex using try_lock succeeds")
+      {
+        REQUIRE(mutex.try_lock());
+      }
+    }
+
+    WHEN("the current thread has locked the mutex")
+    {
+      mutex.lock();
+
+      THEN("unlocking the mutex succeeds")
+      {
+        mutex.unlock();
+      }
+
+      THEN("locking the mutex panics")
+      {
+        REQUIRE_THROWS_AS(mutex.lock(), kernel::tests::cpu::halt);
+      }
+
+      THEN("locking the mutex using try_lock fails")
+      {
+        REQUIRE_FALSE(mutex.try_lock());
+      }
+    }
+  }
+}
+
+SCENARIO("Tracked mutex as a lockable for lock_guard")
+{
+  GIVEN("a tracked mutex")
+  {
+    auto mutex = kapi::tracked_mutex{};
+
+    WHEN("the current thread hasn't locked the mutex")
+    {
+      THEN("it can be locked using a lock_guard")
+      {
+        auto guard = kstd::lock_guard{mutex};
+      }
+    }
+
+    WHEN("the current thread has locked the mutex")
+    {
+      mutex.lock();
+
+      THEN("it can be adopted by a lock_guard")
+      {
+        auto guard = kstd::lock_guard{mutex, kstd::adopt_lock};
+      }
+    }
+  }
+}
\ No newline at end of file
-- 
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