Nothing

```
context("sparse-unfold")
# test data
dims <- c(2,2,2)
subs <- matrix(c(1,1,1, 2,1,1, 1,1,2), nrow = length(dims))
vals <- c(10,100,20)
X <- sptensor(subs, vals, dims)
test_that("unfolding sparse tensor along mode 1 works with expected inputs", {
i <- c(1,2,1)
j <- c(1,1,3)
newdims <- c(2,4)
mode <- 1
mat <- Matrix::sparseMatrix(i, j, x = vals, dims = newdims, giveCsparse = FALSE)
expected <- unfolded_sptensor(mat, mode, dim(X))
expect_equal(unfold(X, mode), expected)
})
test_that("unfolding sparse tensor along mode 2 works with expected inputs", {
i <- c(1,1,1)
j <- c(1,2,3)
newdims <- c(2,4)
mode <- 2
mat <- Matrix::sparseMatrix(i, j, x = vals, dims = newdims, giveCsparse = FALSE)
expected <- unfolded_sptensor(mat, mode, dim(X))
expect_equal(unfold(X, mode), expected)
})
test_that("unfolding sparse tensor along mode 3 works with expected inputs", {
i <- c(1,1,2)
j <- c(1,2,1)
newdims <- c(2,4)
mode <- 3
mat <- Matrix::sparseMatrix(i, j, x = vals, dims = newdims, giveCsparse = FALSE)
expected <- unfolded_sptensor(mat, mode, dim(X))
expect_equal(unfold(X, mode), expected)
})
test_that("refolding a folded tensor returns original tensor", {
expect_equal(refold(unfold(X, 1)), X)
expect_equal(refold(unfold(X, 2)), X)
expect_equal(refold(unfold(X, 3)), X)
})
test_that("unfolded sparse tensor shows outputs", {
expect_output(show(unfold(X, 1)))
})
```

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