add devfs filesystem tests, and storage_boot_module_fixture to mock real boot modules

1 files changed, 63 insertions, 0 deletions

diff --git a/kernel/src/filesystem/devfs/filesystem.tests.cpp b/kernel/src/filesystem/devfs/filesystem.tests.cpp
new file mode 100644
index 0000000..1d82bf9
--- /dev/null
+++ b/kernel/src/filesystem/devfs/filesystem.tests.cpp
@@ -0,0 +1,63 @@
+#include "kernel/filesystem/devfs/filesystem.hpp"
+
+#include "kernel/filesystem/filesystem.hpp"
+#include "kernel/test_support/filesystem/storage_boot_module_fixture.hpp"
+
+#include <catch2/catch_test_macros.hpp>
+
+SCENARIO_METHOD(kernel::tests::filesystem::storage_boot_module_fixture,
+                "Devfs filesystem lookup uses storage management devices", "[filesystem][devfs][filesystem]")
+{
+  GIVEN("a boot module registry with one module")
+  {
+    setup_modules(1);
+
+    auto fs = kernel::filesystem::devfs::filesystem{};
+    auto result = fs.mount(nullptr);
+
+    THEN("mount succeeds")
+    {
+      REQUIRE(result == kernel::filesystem::filesystem::operation_result::success);
+      REQUIRE(fs.root_inode() != nullptr);
+    }
+
+    THEN("lookup on root finds ram0 device inode")
+    {
+      auto inode = fs.lookup(fs.root_inode(), "ram0");
+      REQUIRE(inode != nullptr);
+      REQUIRE(inode->is_device());
+    }
+
+    THEN("lookup of an unknown device returns null")
+    {
+      auto inode = fs.lookup(fs.root_inode(), "ram99");
+      REQUIRE(inode == nullptr);
+    }
+
+    THEN("lookup with a non-directory parent returns null")
+    {
+      auto non_directory_inode = fs.lookup(fs.root_inode(), "ram0");
+      REQUIRE(non_directory_inode != nullptr);
+      REQUIRE(!non_directory_inode->is_directory());
+
+      auto result = fs.lookup(non_directory_inode, "anything");
+      REQUIRE(result == nullptr);
+    }
+  }
+
+  GIVEN("a boot module registry with three modules")
+  {
+    setup_modules(3, 2048);
+
+    auto fs = kernel::filesystem::devfs::filesystem{};
+    auto result = fs.mount(nullptr);
+    REQUIRE(result == kernel::filesystem::filesystem::operation_result::success);
+
+    THEN("lookup finds all generated RAM devices")
+    {
+      REQUIRE(fs.lookup(fs.root_inode(), "ram0") != nullptr);
+      REQUIRE(fs.lookup(fs.root_inode(), "ram16") != nullptr);
+      REQUIRE(fs.lookup(fs.root_inode(), "ram32") != nullptr);
+    }
+  }
+}