monitor: centralize solitary and scanout eligibility checks

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/helpers/Drm.cpp b/tests/helpers/Drm.cpp
new file mode 100644
index 00000000..6ebc2367
--- /dev/null
+++ b/tests/helpers/Drm.cpp
@@ -0,0 +1,32 @@
+#include <helpers/Drm.hpp>
+
+#include <gtest/gtest.h>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+TEST(Helpers, drmDevIDFromFDCharacterDevice) {
+    const int FD = open("/dev/null", O_RDONLY | O_CLOEXEC);
+    ASSERT_GE(FD, 0);
+
+    struct stat stat = {};
+    ASSERT_EQ(fstat(FD, &stat), 0);
+
+    const auto devID = DRM::devIDFromFD(FD);
+    EXPECT_TRUE(devID.has_value());
+    EXPECT_EQ(*devID, stat.st_rdev);
+
+    close(FD);
+}
+
+TEST(Helpers, drmDevIDFromFDRejectsRegularFiles) {
+    char      path[] = "/tmp/hyprland-drm-testXXXXXX";
+    const int FD     = mkstemp(path);
+    ASSERT_GE(FD, 0);
+
+    EXPECT_FALSE(DRM::devIDFromFD(FD).has_value());
+
+    close(FD);
+    unlink(path);
+}