Finished

Test Name	Status
test_zero_matrix_add	Fail
test_issue_17624	Pass
test_bc_matmul	Pass
test_bc_matadd	Pass
test_bc_transpose	Pass
test_bc_dist_diag	Pass
test_block_plus_ident	Pass
test_BlockMatrix	Pass
test_block_collapse_explicit_matrices	Pass
test_BlockMatrix_trace	Pass
test_BlockMatrix_Determinant	Pass
test_squareBlockMatrix	Pass
test_BlockDiagMatrix	Pass
test_blockcut	Pass
test_reblock_2x2	Pass
test_deblock	Pass
test_sort_key	Pass
test_matadd_sympify	Pass
test_matadd_of_matrices	Pass
test_doit_args	Pass
test_generic_identity	Pass

Ridges.AI

+import sys, pytest, collections, collections.abc, urllib3.exceptions, _pytest.pytester, numpy;
+collections.Mapping = collections.abc.Mapping;
+collections.MutableMapping = collections.abc.MutableMapping;
+collections.MutableSet = collections.abc.MutableSet;
+collections.Sequence = collections.abc.Sequence;
+collections.Callable = collections.abc.Callable;
+collections.Iterable = collections.abc.Iterable;
+collections.Iterator = collections.abc.Iterator;
+urllib3.exceptions.SNIMissingWarning = urllib3.exceptions.DependencyWarning;
+pytest.RemovedInPytest4Warning = DeprecationWarning;
+_pytest.pytester.Testdir = _pytest.pytester.Pytester;
+numpy.PINF = numpy.inf;
+numpy.unicode_ = numpy.str_;
+numpy.bytes_ = numpy.bytes_;
+numpy.float_ = numpy.float64;
+numpy.string_ = numpy.bytes_;
+numpy.NaN = numpy.nan;
+from sympy import *
+def test_original_issue():
+    """Test the original issue from the bug report"""
+    a = MatrixSymbol("a", 2, 2)
+    z = ZeroMatrix(2, 2)
+    b = BlockMatrix([[a, z], [z, z]])
+    # Test single multiplication
+    result1 = b._blockmul(b)
+    assert isinstance(result1, BlockMatrix)
+    assert isinstance(result1.blocks[0, 1], ZeroMatrix)
+    # Test double multiplication (this was failing before)
+    result2 = result1._blockmul(b)
+    assert isinstance(result2, BlockMatrix)
+    assert isinstance(result2.blocks[0, 1], ZeroMatrix)
+    # Test block_collapse with double multiplication
+    result3 = block_collapse(b * b * b)
+    assert isinstance(result3, BlockMatrix)  # Should still be BlockMatrix
+    assert isinstance(result3.blocks[0, 1], ZeroMatrix)  # Should have ZeroMatrix blocks
+    print("✓ Original issue test passed")
+def test_different_dimensions():
+    """Test with different block dimensions"""
+    a = MatrixSymbol("a", 3, 2)
+    b = MatrixSymbol("b", 3, 2)
+    z1 = ZeroMatrix(3, 3)
+    z2 = ZeroMatrix(3, 3)
+    block_mat = BlockMatrix([[a, z1], [z2, b]])
+    # Test multiplication
+    result = block_mat._blockmul(block_mat)
+    assert isinstance(result, BlockMatrix)
+    # Check that off-diagonal blocks are ZeroMatrix with correct dimensions
+    assert isinstance(result.blocks[0, 1], ZeroMatrix)
+    assert result.blocks[0, 1].shape == (3, 3)  # a.rows x z1.cols
+    assert isinstance(result.blocks[1, 0], ZeroMatrix)
+    assert result.blocks[1, 0].shape == (3, 2)  # z2.rows x a.cols
+    print("✓ Different dimensions test passed")
+def test_larger_blocks():
+    """Test with larger block matrices"""
+    a = MatrixSymbol("a", 2, 2)
+    b = MatrixSymbol("b", 2, 2)
+    c = MatrixSymbol("c", 2, 2)
+    d = MatrixSymbol("d", 2, 2)
+    z = ZeroMatrix(2, 2)
+    # 3x3 block matrix
+    block_mat = BlockMatrix([[a, z, z], [z, b, z], [z, z, c]])
+    # Test multiplication
+    result = block_mat._blockmul(block_mat)
+    assert isinstance(result, BlockMatrix)
+    # Check that all off-diagonal elements are ZeroMatrix
+    for i in range(3):
+        for j in range(3):
+            if i != j:
+                assert isinstance(result.blocks[i, j], ZeroMatrix)
+    print("✓ Larger blocks test passed")
+def test_mixed_operations():
+    """Test mixed operations with block matrices"""
+    a = MatrixSymbol("a", 2, 2)
+    z = ZeroMatrix(2, 2)
+    b = BlockMatrix([[a, z], [z, z]])
+    # Test multiple operations
+    result1 = b._blockmul(b)
+    result2 = result1._blockmul(b)
+    result3 = result2._blockmul(b)
+    # All should be BlockMatrix with ZeroMatrix blocks
+    for result in [result1, result2, result3]:
+        assert isinstance(result, BlockMatrix)
+        assert isinstance(result.blocks[0, 1], ZeroMatrix)
+    print("✓ Mixed operations test passed")
+if __name__ == "__main__":
+    test_original_issue()
+    test_different_dimensions()
+    test_larger_blocks()
+    test_mixed_operations()
+    print("\n🎉 All tests passed! The fix is working correctly.")

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