feat: adding more tests for a .T shortcut

tests/test_general.py

@@ -973,3 +973,26 @@ def test_T_empty():
     hist_empty = hist.Hist()
     hist_T_empty = hist_empty.T
     assert hist_empty == hist_T_empty
+
+def test_T_1D():
+    # Create a 1D histogram with some data
+    hist_data_1D = np.array([1, 2, 3, 4, 5])
+    h_1D = hist.Hist(hist.axis.Regular(5, 0, 1, flow=False), data=hist_data_1D)
+
+    assert h_1D.T.values() == approx(h_1D.values().T)
+    assert h_1D.T.axes[0] == h_1D.axes[0]
+
+def test_T_3D():
+    # Create a 3D histogram with some data
+    hist_data_3D = np.random.rand(1, 3, 4)
+    h_3D = hist.Hist(
+        hist.axis.Regular(2, 0, 1, flow=False),
+        hist.axis.Regular(3, 2, 3, flow=False),
+        hist.axis.Regular(4, 5, 6, flow=False),
+        data=hist_data_3D,
+    )
+
+    assert h_3D.T.values() == approx(h_3D.values().T)
+    assert h_3D.T.axes[0] == h_3D.axes[2]
+    assert h_3D.T.axes[1] == h_3D.axes[1]
+    assert h_3D.T.axes[2] == h_3D.axes[0]