add test

Author: SobhanMP

test/sparsematrix_ops.jl

@@ -442,4 +442,11 @@ end
     @test one(A) isa SparseMatrixCSC{Int}
 end
 
+@testset "transpose! does not allocate" begin
+    A = sprandn(100, 100, 0.1),
+    X = deepcopy(A)
+    transpose!(X, A)
+    nonzeros(X) .= 0.0
+    @test @allocated(transpose!(X, A)) == 0
+end
 end # module