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 *
+from sympy.matrices.expressions.blockmatrix import BlockMatrix, block_collapse
+def test_original_issue():
+    """Test the exact issue from the problem statement"""
+    a = MatrixSymbol("a", 2, 2)
+    z = ZeroMatrix(2, 2)
+    b = BlockMatrix([[a, z], [z, z]])
+    # Test single multiplication (should work)
+    result1 = block_collapse(b * b)
+    # Check that it has the right structure
+    assert isinstance(result1, BlockMatrix)
+    assert result1.blocks[0, 0] == a**2
+    assert isinstance(result1.blocks[0, 1], ZeroMatrix)
+    assert isinstance(result1.blocks[1, 0], ZeroMatrix)
+    assert isinstance(result1.blocks[1, 1], ZeroMatrix)
+    # Test direct _blockmul (should work)
+    result1_direct = b._blockmul(b)
+    assert isinstance(result1_direct, BlockMatrix)
+    assert result1_direct.blocks[0, 0] == a**2
+    assert isinstance(result1_direct.blocks[0, 1], ZeroMatrix)
+    assert isinstance(result1_direct.blocks[1, 0], ZeroMatrix)
+    assert isinstance(result1_direct.blocks[1, 1], ZeroMatrix)
+    # Test double multiplication (this was the failing case)
+    result2 = block_collapse(b * b * b)
+    assert isinstance(result2, BlockMatrix)
+    assert result2.blocks[0, 0] == a**3
+    assert isinstance(result2.blocks[0, 1], ZeroMatrix)
+    assert isinstance(result2.blocks[1, 0], ZeroMatrix)
+    assert isinstance(result2.blocks[1, 1], ZeroMatrix)
+    # Test triple _blockmul (this was also failing)
+    result2_direct = b._blockmul(b)._blockmul(b)
+    assert isinstance(result2_direct, BlockMatrix)
+    assert result2_direct.blocks[0, 0] == a**3
+    assert isinstance(result2_direct.blocks[0, 1], ZeroMatrix)
+    assert isinstance(result2_direct.blocks[1, 0], ZeroMatrix)
+    assert isinstance(result2_direct.blocks[1, 1], ZeroMatrix)
+    print("✓ Original issue test passed")
+def test_different_sizes():
+    """Test with different matrix sizes"""
+    a = MatrixSymbol("a", 3, 3)
+    b = MatrixSymbol("b", 3, 2)
+    c = MatrixSymbol("c", 2, 3)
+    d = MatrixSymbol("d", 2, 2)
+    z1 = ZeroMatrix(3, 3)
+    z2 = ZeroMatrix(3, 2)
+    z3 = ZeroMatrix(2, 3)
+    z4 = ZeroMatrix(2, 2)
+    block_mat = BlockMatrix([[a, b], [c, d]])
+    block_mat_zeros = BlockMatrix([[z1, z2], [z3, z4]])
+    # Test multiplication with zero blocks
+    result = block_collapse(block_mat * block_mat_zeros)
+    assert isinstance(result, BlockMatrix)
+    # All blocks should be zero matrices
+    assert isinstance(result.blocks[0, 0], ZeroMatrix)
+    assert isinstance(result.blocks[0, 1], ZeroMatrix)
+    assert isinstance(result.blocks[1, 0], ZeroMatrix)
+    assert isinstance(result.blocks[1, 1], ZeroMatrix)
+    print("✓ Different sizes test passed")
+def test_mixed_blocks():
+    """Test with mixed zero and non-zero blocks"""
+    a = MatrixSymbol("a", 2, 2)
+    b = MatrixSymbol("b", 2, 2)
+    z = ZeroMatrix(2, 2)
+    block1 = BlockMatrix([[a, z], [z, b]])
+    block2 = BlockMatrix([[z, a], [b, z]])
+    # Test multiplication - just check it works and returns a BlockMatrix
+    result = block_collapse(block1 * block2)
+    assert isinstance(result, BlockMatrix)
+    # Check that all blocks are either ZeroMatrix or Matrix expressions
+    for i in range(2):
+        for j in range(2):
+            block = result.blocks[i, j]
+            assert isinstance(block, (ZeroMatrix, MatrixExpr)), f"Block [{i},{j}] should be ZeroMatrix or MatrixExpr, got {type(block)}"
+    print("✓ Mixed blocks test passed")
+def test_zero_matrix_types():
+    """Test that zero blocks remain as ZeroMatrix after multiplication"""
+    a = MatrixSymbol("a", 2, 2)
+    z = ZeroMatrix(2, 2)
+    b = BlockMatrix([[a, z], [z, z]])
+    result = b._blockmul(b)
+    # Check that zero blocks are still ZeroMatrix objects
+    assert isinstance(result.blocks[0, 1], ZeroMatrix), f"Block [0,1] should be ZeroMatrix, got {type(result.blocks[0,1])}"
+    assert isinstance(result.blocks[1, 0], ZeroMatrix), f"Block [1,0] should be ZeroMatrix, got {type(result.blocks[1,0])}"
+    assert isinstance(result.blocks[1, 1], ZeroMatrix), f"Block [1,1] should be ZeroMatrix, got {type(result.blocks[1,1])}"
+    # Test after second multiplication
+    result2 = result._blockmul(b)
+    assert isinstance(result2.blocks[0, 1], ZeroMatrix), f"Block [0,1] should be ZeroMatrix after second mul, got {type(result2.blocks[0,1])}"
+    assert isinstance(result2.blocks[1, 0], ZeroMatrix), f"Block [1,0] should be ZeroMatrix after second mul, got {type(result2.blocks[1,0])}"
+    assert isinstance(result2.blocks[1, 1], ZeroMatrix), f"Block [1,1] should be ZeroMatrix after second mul, got {type(result2.blocks[1])}"
+    print("✓ Zero matrix types test passed")
+if __name__ == "__main__":
+    test_original_issue()
+    test_different_sizes()
+    test_mixed_blocks()
+    test_zero_matrix_types()
+    print("\n🎉 All tests passed! The fix is working correctly.")

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