From 60118b1df5196c4e416ddd6ad2a40be062f68251 Mon Sep 17 00:00:00 2001
From: Lukas Oesch <lukasoesch20@gmail.com>
Date: Wed, 8 Apr 2026 22:57:55 +0200
Subject: add devfs and rootfs inode tests

---
 kernel/CMakeLists.txt                        |  2 +
 kernel/src/filesystem/devfs/inode.tests.cpp  | 54 ++++++++++++++++++
 kernel/src/filesystem/rootfs/inode.tests.cpp | 83 ++++++++++++++++++++++++++++
 3 files changed, 139 insertions(+)
 create mode 100644 kernel/src/filesystem/devfs/inode.tests.cpp
 create mode 100644 kernel/src/filesystem/rootfs/inode.tests.cpp

(limited to 'kernel')

diff --git a/kernel/CMakeLists.txt b/kernel/CMakeLists.txt
index b664def..e3a357b 100644
--- a/kernel/CMakeLists.txt
+++ b/kernel/CMakeLists.txt
@@ -131,6 +131,8 @@ else()
         "src/memory/block_list_allocator.tests.cpp"
 
         # Filesystem Subsystem Tests
+        "src/filesystem/devfs/inode.tests.cpp"
+        "src/filesystem/rootfs/inode.tests.cpp"
         "src/filesystem/dentry.tests.cpp"
         "src/filesystem/device_inode.tests.cpp"
         "src/filesystem/file_descriptor_table.tests.cpp"
diff --git a/kernel/src/filesystem/devfs/inode.tests.cpp b/kernel/src/filesystem/devfs/inode.tests.cpp
new file mode 100644
index 0000000..50e34a7
--- /dev/null
+++ b/kernel/src/filesystem/devfs/inode.tests.cpp
@@ -0,0 +1,54 @@
+#include "kernel/filesystem/devfs/inode.hpp"
+
+#include <kstd/memory>
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <catch2/catch_test_macros.hpp>
+
+#include <cstdint>
+
+SCENARIO("Devfs inode creation", "[filesystem][devfs][inode]")
+{
+  GIVEN("a devfs inode")
+  {
+    auto inode = kernel::filesystem::devfs::inode{};
+
+    THEN("the inode has the correct kind")
+    {
+      REQUIRE(inode.is_directory());
+      REQUIRE_FALSE(inode.is_device());
+      REQUIRE_FALSE(inode.is_regular());
+    }
+  }
+}
+
+SCENARIO("Devfs inode read/write", "[filesystem][devfs][inode]")
+{
+  GIVEN("a devfs inode")
+  {
+    auto inode = kernel::filesystem::devfs::inode{};
+
+    WHEN("attempting to read from the devfs inode")
+    {
+      kstd::vector<uint8_t> buffer(512);
+      auto bytes_read = inode.read(buffer.data(), 0, buffer.size());
+
+      THEN("no bytes are read")
+      {
+        REQUIRE(bytes_read == 0);
+      }
+    }
+
+    WHEN("attempting to write to the devfs inode")
+    {
+      kstd::vector<uint8_t> buffer(512);
+      auto bytes_written = inode.write(buffer.data(), 0, buffer.size());
+
+      THEN("no bytes are written")
+      {
+        REQUIRE(bytes_written == 0);
+      }
+    }
+  }
+}
diff --git a/kernel/src/filesystem/rootfs/inode.tests.cpp b/kernel/src/filesystem/rootfs/inode.tests.cpp
new file mode 100644
index 0000000..a0c5938
--- /dev/null
+++ b/kernel/src/filesystem/rootfs/inode.tests.cpp
@@ -0,0 +1,83 @@
+#include "kernel/filesystem/rootfs/inode.hpp"
+
+#include <kstd/memory>
+#include <kstd/print>
+#include <kstd/vector>
+
+#include <catch2/catch_test_macros.hpp>
+
+SCENARIO("Rootfs inode creation", "[filesystem][rootfs][inode]")
+{
+  GIVEN("a rootfs inode")
+  {
+    auto inode = kernel::filesystem::rootfs::inode{};
+
+    THEN("the inode has the correct kind")
+    {
+      REQUIRE(inode.is_directory());
+      REQUIRE_FALSE(inode.is_device());
+      REQUIRE_FALSE(inode.is_regular());
+    }
+
+    THEN("the inode has no children")
+    {
+      REQUIRE(inode.lookup_child("child") == nullptr);
+    }
+  }
+}
+
+SCENARIO("Rootfs inode child management", "[filesystem][rootfs][inode]")
+{
+  GIVEN("a rootfs inode")
+  {
+    auto inode = kernel::filesystem::rootfs::inode{};
+
+    WHEN("adding a child inode")
+    {
+      inode.add_child("child");
+      inode.add_child("another child");
+
+      THEN("the child can be looked up by name")
+      {
+        auto child_inode = inode.lookup_child("child");
+        REQUIRE(child_inode != nullptr);
+        REQUIRE(child_inode->is_directory());
+      }
+
+      THEN("looking up a non-existent child returns null")
+      {
+        REQUIRE(inode.lookup_child("nonexistent") == nullptr);
+      }
+    }
+  }
+}
+
+SCENARIO("Rootfs inode read/write", "[filesystem][rootfs][inode]")
+{
+  GIVEN("a rootfs inode")
+  {
+    auto inode = kernel::filesystem::rootfs::inode{};
+
+    WHEN("reading from the inode")
+    {
+      kstd::vector<char> buffer(10);
+      auto bytes_read = inode.read(buffer.data(), 0, buffer.size());
+
+      THEN("no bytes are read")
+      {
+        REQUIRE(bytes_read == 0);
+      }
+    }
+
+    WHEN("writing to the inode")
+    {
+      kstd::vector<char> buffer(10, 'x');
+      auto bytes_written = inode.write(buffer.data(), 0, buffer.size());
+
+      THEN("no bytes are written")
+      {
+        REQUIRE(bytes_written == 0);
+      }
+    }
+  }
+}
-- 
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