Added test of property sample_to_detector to TestEBSDDetector class

The new EBSDDetector property sample_to_detector returns a Rotation.
The test checks the type is correct and that values are correct according
to some expected values for different parameters.

Signed-off-by: tgwoodcock <tgwoodcock@users.noreply.github.com>

tests/test_detectors/test_ebsd_detector.py

@@ -22,6 +22,7 @@
 import matplotlib.pyplot as plt
 import numpy as np
 from orix.crystal_map import PhaseList
+from orix.quaternion import Rotation
 import pytest
 
 import kikuchipy as kp
@@ -212,6 +213,59 @@ def test_gnomonic_scale(self, pc1, shape, desired_x_scale, desired_y_scale):
         assert np.allclose(detector.x_scale, desired_x_scale, atol=1e-6)
         assert np.allclose(detector.y_scale, desired_y_scale, atol=1e-6)
 
+    @pytest.mark.parametrize(
+        "tilt, azimuthal, twist, sample_tilt, expected_angle, expected_axis, expected_rotation",
+        [
+            (
+                0,
+                0,
+                0,
+                90,
+                90.0,
+                np.array([0.0, 0.0, 1.0]),
+                np.array([[0.70710678, 0.0, 0.0, 0.70710678]]),
+            ),
+            (
+                0,
+                0,
+                0,
+                70,
+                91.7279410723505,
+                np.array([0.17108787, 0.17108787, 0.97028753]),
+                np.array([[0.69636424, 0.1227878, 0.1227878, 0.69636424]]),
+            ),
+            (
+                8.3,
+                4.7,
+                1.02,
+                70,
+                94.94104636971042,
+                np.array([0.19765823, 0.27176174, 0.94184754]),
+                np.array([[0.67596942, 0.14566022, 0.20026929, 0.69407539]]),
+            ),
+        ],
+    )
+    def test_sample_to_detector(
+        self,
+        tilt,
+        azimuthal,
+        twist,
+        sample_tilt,
+        expected_angle,
+        expected_axis,
+        expected_rotation,
+    ):
+        """Check the Rotation sample_to_detector has the correct type and values."""
+        detector = kp.detectors.EBSDDetector(
+            tilt=tilt, azimuthal=azimuthal, twist=twist, sample_tilt=sample_tilt
+        )
+        smpl_to_det = detector.sample_to_detector
+
+        assert isinstance(smpl_to_det, Rotation)
+        assert np.allclose(np.rad2deg(smpl_to_det.angle)[0], expected_angle)
+        assert np.allclose(smpl_to_det.axis.data.squeeze(), expected_axis)
+        assert np.allclose(smpl_to_det.data, expected_rotation)
+
     def test_coordinate_conversion_factors(self):
         """Factors for converting between pixel and gonomic coords."""
         s = kp.data.nickel_ebsd_small()