diff --git a/src/unittest/CMakeLists.txt b/src/unittest/CMakeLists.txt
index 8a878cdd7..fb3e1f97a 100644
--- a/src/unittest/CMakeLists.txt
+++ b/src/unittest/CMakeLists.txt
@@ -13,6 +13,8 @@ set (UNITTEST_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/test_filesys.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_inventory.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_irrptr.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/test_irr_matrix4.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/test_irr_quaternion.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_logging.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_lua.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_map.cpp
@@ -54,7 +56,6 @@ set (UNITTEST_CLIENT_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/test_eventmanager.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_gameui.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_irr_gltf_mesh_loader.cpp
-	${CMAKE_CURRENT_SOURCE_DIR}/test_irr_matrix4.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_mesh_compare.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/test_keycode.cpp
 	PARENT_SCOPE)
diff --git a/src/unittest/test_irr_quaternion.cpp b/src/unittest/test_irr_quaternion.cpp
new file mode 100644
index 000000000..1bb0c3cc9
--- /dev/null
+++ b/src/unittest/test_irr_quaternion.cpp
@@ -0,0 +1,40 @@
+// Luanti
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "catch.h"
+#include "irrMath.h"
+#include "matrix4.h"
+#include "quaternion.h"
+#include "irr_v3d.h"
+
+using matrix4 = core::matrix4;
+
+static bool matrix_equals(const matrix4 &a, const matrix4 &b) {
+    return a.equals(b, 0.00001f);
+}
+
+TEST_CASE("quaternion") {
+
+// Make sure that the conventions are consistent
+SECTION("equivalence to euler rotations") {
+    auto test_rotation = [](v3f rad) {
+        matrix4 R;
+        R.setRotationRadians(rad);
+        v3f rad2;
+        core::quaternion(rad).toEuler(rad2);
+        matrix4 R2;
+        R2.setRotationRadians(rad2);
+        CHECK(matrix_equals(R, R2));
+    };
+
+    test_rotation({100, 200, 300});
+    Catch::Generators::RandomFloatingGenerator<f32> gen(0.0f, 2 * core::PI, Catch::getSeed());
+    for (int i = 0; i < 1000; ++i)
+        test_rotation(v3f{gen.get(), gen.get(), gen.get()});
+    for (int i = 0; i < 4; i++)
+    for (int j = 0; j < 4; j++)
+    for (int k = 0; k < 4; k++)
+        test_rotation(core::PI / 4.0f * v3f(i, j, k));
+}
+
+}
\ No newline at end of file