diff --git a/matrixmania/__init__.py b/matrixmania/__init__.py
index 975a585..c812c86 100644
--- a/matrixmania/__init__.py
+++ b/matrixmania/__init__.py
@@ -1 +1 @@
-from .compute import matmul, transpose, rot_2D
\ No newline at end of file
+from .compute import matmul, transpose, rot_2D, rot_3D
\ No newline at end of file
diff --git a/tests/test_rot3D.py b/tests/test_rot3D.py
index ad408f3..65d073e 100644
--- a/tests/test_rot3D.py
+++ b/tests/test_rot3D.py
@@ -1 +1,9 @@
-from matrixmania import rot_3D
\ No newline at end of file
+from matrixmania import rot_3D
+
+def test_rot_3D():
+    angle = 90
+    result = rot_3D(angle,"x")
+    print(f"Angle:{angle}   Rot-Matrix:{result}")
+
+    assert result == [[1, 0, 0], [0, 6.123233995736766e-17, -1.0], [0, 1.0, 6.123233995736766e-17]] == [[6.123233995736766e-17, -1.0], [1.0, 6.123233995736766e-17]]
+