From 05fa44fac798dd58214691b5247624cc648ee453 Mon Sep 17 00:00:00 2001
From: Nicolas Kruse <nicolas@nonan.net>
Date: Tue, 30 Dec 2025 17:58:52 +0100
Subject: [PATCH] test for tensor type added/updated

---
 tests/test_matrix.py       | 111 ++++++++--------
 tests/test_tensor_basic.py | 257 +++++++++++++++++++++++++++++++++++++
 2 files changed, 309 insertions(+), 59 deletions(-)
 create mode 100644 tests/test_tensor_basic.py

diff --git a/tests/test_matrix.py b/tests/test_matrix.py
index f9e18c3..894d0c5 100644
--- a/tests/test_matrix.py
+++ b/tests/test_matrix.py
@@ -4,26 +4,24 @@ import pytest
 
 def test_matrix_init():
     """Test basic matrix initialization"""
-    m1 = cp.matrix([[1, 2, 3], [4, 5, 6]])
-    assert m1.rows == 2
-    assert m1.cols == 3
+    m1 = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    assert m1.shape == (2, 3)
     assert m1[0] == (1, 2, 3)
     assert m1[1] == (4, 5, 6)
 
 
 def test_matrix_with_variables():
     """Test matrix initialization with variables"""
-    m1 = cp.matrix([[cp.value(1), 2], [3, cp.value(4)]])
-    assert m1.rows == 2
-    assert m1.cols == 2
-    assert isinstance(m1[0][0], cp.value)
-    assert isinstance(m1[1][1], cp.value)
+    m1 = cp.tensor([[cp.value(1), 2], [3, cp.value(4)]])
+    assert m1.shape == (2, 2)
+    assert isinstance(m1[0][0], cp.tensor)
+    assert isinstance(m1[1][1], cp.tensor)
 
 
 def test_matrix_addition():
     """Test matrix addition"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
-    m2 = cp.matrix([[5, 6], [7, 8]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
+    m2 = cp.tensor([[5, 6], [7, 8]])
     m3 = m1 + m2
 
     assert m3[0] == (6, 8)
@@ -32,7 +30,7 @@ def test_matrix_addition():
 
 def test_matrix_scalar_addition():
     """Test matrix addition with scalar"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
     m2 = m1 + 5
 
     assert m2[0] == (6, 7)
@@ -41,8 +39,8 @@ def test_matrix_scalar_addition():
 
 def test_matrix_subtraction():
     """Test matrix subtraction"""
-    m1 = cp.matrix([[5, 6], [7, 8]])
-    m2 = cp.matrix([[1, 2], [3, 4]])
+    m1 = cp.tensor([[5, 6], [7, 8]])
+    m2 = cp.tensor([[1, 2], [3, 4]])
     m3 = m1 - m2
 
     assert m3[0] == (4, 4)
@@ -51,7 +49,7 @@ def test_matrix_subtraction():
 
 def test_matrix_scalar_subtraction():
     """Test matrix subtraction with scalar"""
-    m1 = cp.matrix([[5, 6], [7, 8]])
+    m1 = cp.tensor([[5, 6], [7, 8]])
     m2 = m1 - 2
 
     assert m2[0] == (3, 4)
@@ -60,17 +58,19 @@ def test_matrix_scalar_subtraction():
 
 def test_matrix_negation():
     """Test matrix negation"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
     m2 = -m1
 
+    assert m1[0] == (1, 2)
+    assert m1[1] == (3, 4)
     assert m2[0] == (-1, -2)
     assert m2[1] == (-3, -4)
 
 
 def test_matrix_element_wise_multiplication():
     """Test element-wise matrix multiplication"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
-    m2 = cp.matrix([[5, 6], [7, 8]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
+    m2 = cp.tensor([[5, 6], [7, 8]])
     m3 = m1 * m2
 
     assert m3[0] == (5, 12)
@@ -79,7 +79,7 @@ def test_matrix_element_wise_multiplication():
 
 def test_matrix_scalar_multiplication():
     """Test matrix multiplication with scalar"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
     m2 = m1 * 3
 
     assert m2[0] == (3, 6)
@@ -88,8 +88,8 @@ def test_matrix_scalar_multiplication():
 
 def test_matrix_element_wise_division():
     """Test element-wise matrix division"""
-    m1 = cp.matrix([[6.0, 8.0], [12.0, 16.0]])
-    m2 = cp.matrix([[2.0, 2.0], [3.0, 4.0]])
+    m1 = cp.tensor([[6.0, 8.0], [12.0, 16.0]])
+    m2 = cp.tensor([[2.0, 2.0], [3.0, 4.0]])
     m3 = m1 / m2
 
     assert m3[0][0] == pytest.approx(3.0)  # pyright: ignore[reportUnknownMemberType]
@@ -100,7 +100,7 @@ def test_matrix_element_wise_division():
 
 def test_matrix_scalar_division():
     """Test matrix division by scalar"""
-    m1 = cp.matrix([[6.0, 8.0], [12.0, 16.0]])
+    m1 = cp.tensor([[6.0, 8.0], [12.0, 16.0]])
     m2 = m1 / 2.0
 
     assert list(m2[0]) == pytest.approx((3.0, 4.0))  # pyright: ignore[reportUnknownMemberType]
@@ -109,25 +109,24 @@ def test_matrix_scalar_division():
 
 def test_matrix_vector_multiplication():
     """Test matrix-vector multiplication using @ operator"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
     v = cp.vector([7, 8, 9])
     result = m @ v
 
-    assert isinstance(result, cp.vector)
+    assert isinstance(result, cp.tensor)
     assert len(result.values) == 2
-    assert result.values[0] == 1*7 + 2*8 + 3*9
-    assert result.values[1] == 4*7 + 5*8 + 6*9
+    assert result[0] == 1*7 + 2*8 + 3*9
+    assert result[1] == 4*7 + 5*8 + 6*9
 
 
 def test_matrix_matrix_multiplication():
     """Test matrix-matrix multiplication using @ operator"""
-    m1 = cp.matrix([[1, 2], [3, 4]])
-    m2 = cp.matrix([[5, 6], [7, 8]])
+    m1 = cp.tensor([[1, 2], [3, 4]])
+    m2 = cp.tensor([[5, 6], [7, 8]])
     result = m1 @ m2
 
-    assert isinstance(result, cp.matrix)
-    assert result.rows == 2
-    assert result.cols == 2
+    assert isinstance(result, cp.tensor)
+    assert result.shape == (2, 2)
     assert result[0][0] == 1*5 + 2*7
     assert result[0][1] == 1*6 + 2*8
     assert result[1][0] == 3*5 + 4*7
@@ -136,11 +135,10 @@ def test_matrix_matrix_multiplication():
 
 def test_matrix_transpose():
     """Test matrix transpose"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
     mt = m.transpose()
 
-    assert mt.rows == 3
-    assert mt.cols == 2
+    assert mt.shape == (3, 2)
     assert mt[0] == (1, 4)
     assert mt[1] == (2, 5)
     assert mt[2] == (3, 6)
@@ -148,35 +146,34 @@ def test_matrix_transpose():
 
 def test_matrix_transpose_property():
     """Test matrix transpose using .T property"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
     mt = m.T
 
-    assert mt.rows == 3
-    assert mt.cols == 2
+    assert mt.shape == (3, 2)
     assert mt[0] == (1, 4)
 
 
 def test_matrix_row_access():
     """Test getting a row as a vector"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
-    row0 = m.row(0)
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    row0 = m[0]
 
-    assert isinstance(row0, cp.vector)
+    assert isinstance(row0, cp.tensor)
     assert row0.values == (1, 2, 3)
 
 
 def test_matrix_col_access():
     """Test getting a column as a vector"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
-    col1 = m.col(1)
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    col1 = m[:, 1]
 
-    assert isinstance(col1, cp.vector)
-    assert col1.values == (2, 5)
+    assert isinstance(col1, cp.tensor)
+    assert col1 == (2, 5)
 
 
 def test_matrix_trace():
     """Test matrix trace (sum of diagonal elements)"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
+    m = cp.tensor([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
     trace = m.trace()
 
     assert trace == 1 + 5 + 9
@@ -184,7 +181,7 @@ def test_matrix_trace():
 
 def test_matrix_sum():
     """Test sum of all matrix elements"""
-    m = cp.matrix([[1, 2, 3], [4, 5, 6]])
+    m = cp.tensor([[1, 2, 3], [4, 5, 6]])
     total = m.sum()
 
     assert total == 1 + 2 + 3 + 4 + 5 + 6
@@ -192,7 +189,7 @@ def test_matrix_sum():
 
 def test_matrix_map():
     """Test mapping a function over matrix elements"""
-    m = cp.matrix([[1, 2], [3, 4]])
+    m = cp.tensor([[1, 2], [3, 4]])
     m_doubled = m.map(lambda x: x * 2)
 
     assert m_doubled[0] == (2, 4)
@@ -201,20 +198,19 @@ def test_matrix_map():
 
 def test_matrix_homogenize():
     """Test homogenizing matrix (converting to all variables)"""
-    m = cp.matrix([[1, cp.value(2)], [3, 4]])
+    m = cp.tensor([[1, cp.value(2)], [3, 4]])
     m_homo = m.homogenize()
 
     for row in m_homo:
         for elem in row:
-            assert isinstance(elem, cp.value)
+            assert isinstance(elem, cp.tensor) and elem.ndim == 0
 
 
 def test_identity_matrix():
     """Test identity matrix creation"""
     m = cp.identity(3)
 
-    assert m.rows == 3
-    assert m.cols == 3
+    assert m.shape == (3, 3)
     assert m[0] == (1, 0, 0)
     assert m[1] == (0, 1, 0)
     assert m[2] == (0, 0, 1)
@@ -222,20 +218,18 @@ def test_identity_matrix():
 
 def test_zeros_matrix():
     """Test zeros matrix creation"""
-    m = cp.zeros(2, 3)
+    m = cp.zeros([2, 3])
 
-    assert m.rows == 2
-    assert m.cols == 3
+    assert m.shape == (2, 3)
     assert m[0] == (0, 0, 0)
     assert m[1] == (0, 0, 0)
 
 
 def test_ones_matrix():
     """Test ones matrix creation"""
-    m = cp.ones(2, 3)
+    m = cp.ones([2, 3])
 
-    assert m.rows == 2
-    assert m.cols == 3
+    assert m.shape == (2, 3)
     assert m[0] == (1, 1, 1)
     assert m[1] == (1, 1, 1)
 
@@ -245,8 +239,7 @@ def test_diagonal_matrix():
     v = cp.vector([1, 2, 3])
     m = cp.diagonal(v)
 
-    assert m.rows == 3
-    assert m.cols == 3
+    assert m.shape == (3, 3)
     assert m[0] == (1, 0, 0)
     assert m[1] == (0, 2, 0)
     assert m[2] == (0, 0, 3)
@@ -254,7 +247,7 @@ def test_diagonal_matrix():
 
 def test_matrix_with_variables_compiled():
     """Test matrix operations with variables in compilation"""
-    m = cp.matrix([[cp.value(1), 2], [3, cp.value(4)]])
+    m = cp.tensor([[cp.value(1), 2], [3, cp.value(4)]])
     v = cp.vector([cp.value(5), 6])
     result = m @ v
 
diff --git a/tests/test_tensor_basic.py b/tests/test_tensor_basic.py
new file mode 100644
index 0000000..9683d5d
--- /dev/null
+++ b/tests/test_tensor_basic.py
@@ -0,0 +1,257 @@
+#!/usr/bin/env python3
+"""Basic tests for the tensor class."""
+
+import copapy as cp
+
+def test_tensor_basic():
+    # Test 1: Create a scalar tensor
+    print("Test 1: Scalar tensor")
+    t0 = cp.tensor(42)
+    print(f"Scalar tensor: {t0}")
+    print(f"Shape: {t0.shape}, ndim: {t0.ndim}")
+    assert t0.shape == ()
+    assert t0 == 42
+    print()
+
+    # Test 2: Create a 1D tensor from list
+    print("Test 2: 1D tensor")
+    t1 = cp.tensor([1, 2, 3, 4, 5])
+    print(f"1D tensor: shape={t1.shape}, ndim={t1.ndim}")
+    print(f"Elements: {[t1[i] for i in range(len(t1))]}")
+    assert t1.shape == (5,)
+    assert t1.ndim == 1
+    assert t1[0] == 1
+    print()
+
+    # Test 3: Create a 2D tensor (matrix)
+    print("Test 3: 2D tensor")
+    t2 = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    print(f"2D tensor: shape={t2.shape}, ndim={t2.ndim}")
+    print(f"Element [0,1]: {t2[0, 1]}")
+    print(f"Row 1: {t2[1]}")
+    assert t2.shape == (2, 3)
+    assert t2.ndim == 2
+    assert t2[0, 1] == 2
+
+    assert t2[1][2] == 6
+    print()
+
+    # Test 4: Create a 3D tensor
+    print("Test 4: 3D tensor")
+    t3 = cp.tensor([[[1, 2], [3, 4]], [[5, 6], [7, 8]]])
+    print(f"3D tensor: shape={t3.shape}, ndim={t3.ndim}")
+    print(f"Element [0,1,0]: {t3[0, 1, 0]}")
+    assert t3.shape == (2, 2, 2)
+    assert t3.ndim == 3
+    assert t3[0, 1, 0] == 3
+    print()
+
+    # Test 6: Broadcasting with scalar
+    print("Test 6: Broadcasting with scalar")
+    t = cp.tensor([1.0, 2.0, 3.0])
+    result = t * 2.0
+    print(f"tensor * 2.0: shape={result.shape}")
+    print(f"Elements: {[result[i] for i in range(len(result))]}")
+    assert result.shape == (3,)
+    assert result[0] == 2.0
+    assert result[1] == 4.0
+    print()
+
+    # Test 6b: Broadcasting with different dimensions
+    print("Test 6b: Broadcasting with different dimensions")
+    # 2D tensor + 1D tensor
+    t2d = cp.tensor([[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]])
+    t1d = cp.tensor([10.0, 20.0, 30.0])
+    result_2d_1d = t2d + t1d
+    print(f"2D tensor {t2d.shape} + 1D tensor {t1d.shape} = shape {result_2d_1d.shape}")
+    print(f"Elements: {[[result_2d_1d[i, j] for j in range(3)] for i in range(2)]}")
+    assert result_2d_1d.shape == (2, 3)
+    assert result_2d_1d[0, 0] == 11.0
+    assert result_2d_1d[1, 2] == 36.0
+    
+    # 3D tensor + 2D tensor
+    t3d = cp.tensor([[[1.0, 2.0], [3.0, 4.0]], [[5.0, 6.0], [7.0, 8.0]]])
+    t2d_broadcast = cp.tensor([[100.0, 200.0], [300.0, 400.0]])
+    result_3d_2d = t3d + t2d_broadcast
+    print(f"3D tensor {t3d.shape} + 2D tensor {t2d_broadcast.shape} = shape {result_3d_2d.shape}")
+    assert result_3d_2d.shape == (2, 2, 2)
+    assert result_3d_2d[0, 0, 0] == 101.0
+    assert result_3d_2d[1, 1, 1] == 408.0
+    
+    # 3D tensor + 1D tensor
+    t1d_broadcast = cp.tensor([1.0, 2.0])
+    result_3d_1d = t3d + t1d_broadcast
+    print(f"3D tensor {t3d.shape} + 1D tensor {t1d_broadcast.shape} = shape {result_3d_1d.shape}")
+    assert result_3d_1d.shape == (2, 2, 2)
+    assert result_3d_1d[0, 0, 0] == 2.0
+    assert result_3d_1d[1, 1, 1] == 10.0
+    print()
+
+    # 3D tensor + vector
+    t1d_broadcast = cp.vector([1.0, 2.0])
+    result_3d_1d = t3d + t1d_broadcast
+    print(f"3D tensor {t3d.shape} + 1D tensor {t1d_broadcast.shape} = shape {result_3d_1d.shape}")
+    assert result_3d_1d.shape == (2, 2, 2)
+    assert result_3d_1d[0, 0, 0] == 2.0
+    assert result_3d_1d[1, 1, 1] == 10.0
+    print()
+
+    # Test 6c: Element-wise operations with different dimensions
+    print("Test 6c: Element-wise operations with different dimensions")
+    a2d = cp.tensor([[1.0, 2.0], [3.0, 4.0]])
+    b2d = cp.tensor([[2.0, 3.0], [4.0, 5.0]])
+    c2d = a2d * b2d
+    print(f"2D * 2D: shape={c2d.shape}")
+    print(f"Elements: {[[c2d[i, j] for j in range(2)] for i in range(2)]}")
+    assert c2d.shape == (2, 2)
+    assert c2d[0, 0] == 2.0
+    assert c2d[1, 1] == 20.0
+    
+    # 3D - 2D
+    t3d_sub = cp.tensor([[[10.0, 20.0], [30.0, 40.0]], [[50.0, 60.0], [70.0, 80.0]]])
+    t2d_sub = cp.tensor([[1.0, 2.0], [3.0, 4.0]])
+    result_sub = t3d_sub - t2d_sub
+    print(f"3D - 2D: shape={result_sub.shape}")
+    assert result_sub.shape == (2, 2, 2)
+    assert result_sub[0, 0, 0] == 9.0
+    assert result_sub[1, 1, 1] == 76.0
+    print()
+
+    # Test 7: Reshape
+    print("Test 7: Reshape")
+    t = cp.tensor([1, 2, 3, 4, 5, 6])
+    print(f"Original: shape={t.shape}")
+    t_reshaped = t.reshape(2, 3)
+    print(f"Reshaped to (2, 3): shape={t_reshaped.shape}")
+    print(f"Element [1,2]: {t_reshaped[1, 2]}")
+    assert t_reshaped.shape == (2, 3)
+    assert t_reshaped[1, 2] == 6
+    assert t_reshaped[0, 0] == 1
+    print()
+
+    # Test 8: Flatten
+    print("Test 8: Flatten")
+    t = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    flat = t.flatten()
+    print(f"Original: shape={t.shape}")
+    print(f"Flattened: shape={flat.shape}")
+    print(f"Elements: {[flat[i] for i in range(len(flat))]}")
+    assert flat.shape == (6,)
+    assert flat[0] == 1
+    assert flat[5] == 6
+    print()
+
+    # Test 9: Transpose
+    print("Test 9: Transpose")
+    t = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    print(f"Original: shape={t.shape}")
+    t_t = t.transpose()
+    print(f"Transposed: shape={t_t.shape}")
+    print(f"Element [2,1]: {t_t[2, 1]}")
+    assert t_t.shape == (3, 2)
+    assert t_t[2, 1] == 6
+    print()
+
+    # Test 10: Sum operations
+    print("Test 10: Sum operations")
+    t = cp.tensor([[1, 2, 3], [4, 5, 6]])
+    print(f"Original: shape={t.shape}")
+    total = t.sum()
+    print(f"Sum all: {total}")
+    sum_axis0 = t.sum(axis=0)
+    print(f"Sum along axis 0: shape={sum_axis0.shape}")
+    sum_axis1 = t.sum(axis=1)
+    print(f"Sum along axis 1: shape={sum_axis1.shape}")
+    assert total == 21
+    assert sum_axis0.shape == (3,)
+    assert sum_axis0[0] == 5
+    assert sum_axis1.shape == (2,)
+    assert sum_axis1[1] == 15
+    print()
+
+    # Test 10b: Sum with multiple axes and keepdims
+    print("Test 10b: Sum with multiple axes and keepdims")
+    t3d = cp.tensor([[[1, 2], [3, 4]], [[5, 6], [7, 8]]])
+    print(f"Original 3D tensor: shape={t3d.shape}")
+    
+    # Sum along multiple axes
+    sum_axes_0_2 = t3d.sum(axis=(0, 2))
+    print(f"Sum along axes (0, 2): shape={sum_axes_0_2.shape}")
+    assert sum_axes_0_2.shape == (2,), f"Expected (2,), got {sum_axes_0_2.shape}"
+    assert sum_axes_0_2[0] == 1 + 2 + 5 + 6  # Elements from [0,:,*] and [1,:,*]
+    assert sum_axes_0_2[1] == 3 + 4 + 7 + 8
+    print(f"Values: {[sum_axes_0_2[i] for i in range(len(sum_axes_0_2))]}")
+    
+    # Sum with keepdims
+    sum_keepdims = t3d.sum(axis=1, keepdims=True)
+    print(f"Sum along axis 1 with keepdims: shape={sum_keepdims.shape}")
+    assert sum_keepdims.shape == (2, 1, 2), f"Expected (2, 1, 2), got {sum_keepdims.shape}"
+    
+    # Sum multiple axes with keepdims
+    sum_multi_keepdims = t3d.sum(axis=(0, 2), keepdims=True)
+    print(f"Sum along axes (0, 2) with keepdims: shape={sum_multi_keepdims.shape}")
+    assert sum_multi_keepdims.shape == (1, 2, 1), f"Expected (1, 2, 1), got {sum_multi_keepdims.shape}"
+    
+    # Sum all axes with keepdims
+    sum_all_keepdims = t3d.sum(keepdims=True)
+    print(f"Sum all with keepdims: shape={sum_all_keepdims.shape}")
+    assert sum_all_keepdims.shape == (1, 1, 1), f"Expected (1, 1, 1), got {sum_all_keepdims.shape}"
+    assert sum_all_keepdims[0, 0, 0] == 36  # Sum of all elements
+    print()
+
+    # Test 11: Factory functions
+    print("Test 11: Factory functions")
+    z = cp.zeros((2, 3))
+    print(f"zeros((2, 3)): shape={z.shape}")
+    o = cp.ones((3, 2))
+    print(f"ones((3, 2)): shape={o.shape}")
+    e = cp.eye(3)
+    print(f"eye(3): shape={e.shape}")
+    ar = cp.arange(0, 10, 2)
+    print(f"arange(0, 10, 2): shape={ar.shape}")
+    assert z.shape == (2, 3)
+    assert z[0, 0] == 0
+    assert o.shape == (3, 2)
+    assert o[1, 1] == 1
+    print()
+
+    # Test 12: Size and properties
+    print("Test 12: Size and properties")
+    t = cp.tensor([[[1, 2], [3, 4]], [[5, 6], [7, 8]]])
+    print(f"Shape: {t.shape}")
+    print(f"ndim: {t.ndim}")
+    print(f"size: {t.size()}")
+    assert t.shape == (2, 2, 2)
+    assert t.ndim == 3
+    print()
+
+def test_tensor_slicing():
+    print("Test Numpy-style slicing")
+    t = cp.tensor([[10, 20, 30], [40, 50, 60], [70, 80, 90]])
+    print(f"Original tensor: shape={t.shape}")
+
+    slice1 = t[1]
+    print(f"t[1]: {slice1}, shape={slice1.shape}")
+    assert slice1.shape == (3,)
+    assert slice1[0] == 40
+
+    slice2 = t[:, 2]
+    print(f"t[:, 2]: {slice2}, shape={slice2.shape}")
+    assert slice2.shape == (3,)
+    assert slice2[1] == 60
+
+    slice3 = t[0:2, 1:3]
+    print(f"t[0:2, 1:3]: {slice3}, shape={slice3.shape}")
+    assert slice3.shape == (2, 2)
+    assert slice3[0, 0] == 20
+
+    slice4 = t[-1, :]
+    print(f"t[-1, :]: {slice4}, shape={slice4.shape}")
+    assert slice4.shape == (3,)
+    assert slice4[2] == 90
+    print()
+
+if __name__ == "__main__":
+    test_tensor_basic()
+    print("All tests completed!")
+