Nothing

```
context("GraphParamSet")
test_that("graph param vals", {
gr = Graph$new()
gr$add_pipeop(PipeOpScale$new())
gr$add_pipeop(PipeOpPCA$new())
expect_equal(gr$ids(TRUE), c("scale", "pca"))
expect_equal(gr$pipeops$scale$param_set$values$center, NULL)
expect_equal(gr$param_set$values$scale.center, NULL)
gr$param_set$values$scale.center = FALSE
expect_equal(gr$pipeops$scale$param_set$values$center, FALSE)
expect_equal(gr$param_set$values$scale.center, FALSE)
gr$pipeops$scale$param_set$values$center = TRUE
expect_equal(gr$pipeops$scale$param_set$values$center, TRUE)
expect_equal(gr$param_set$values$scale.center, TRUE)
expect_equal(gr$pipeops$pca$param_set$values$center, NULL)
expect_equal(gr$param_set$values$pca.center, NULL)
gr$param_set$values$pca.center = FALSE
expect_equal(gr$pipeops$pca$param_set$values$center, FALSE)
expect_equal(gr$param_set$values$pca.center, FALSE)
gr$pipeops$pca$param_set$values$center = TRUE
expect_equal(gr$pipeops$pca$param_set$values$center, TRUE)
expect_equal(gr$param_set$values$pca.center, TRUE)
expect_set_equal(names(gr$param_set$params),
c("scale.center", "scale.scale" ,"scale.robust", "scale.affect_columns", "pca.center", "pca.scale.", "pca.rank.", "pca.affect_columns"))
expect_error({
gr$pipeops$pca$param_set$values$center = 1
}) # type mismatch
expect_error({
gr$param_set$values$pca.center = 1
})
})
test_that("graph has value changes when param vals change", {
gr = Graph$new()
gr$add_pipeop(PipeOpScale$new())
gr$add_pipeop(PipeOpPCA$new())
expect_equal(gr$ids(TRUE), c("scale", "pca"))
gr$param_set$values$pca.center = FALSE
hashbeginning = gr$hash
gr$param_set$values$pca.center = TRUE
hashend = gr$hash
expect_character(hashbeginning, len = 1)
expect_character(hashend, len = 1)
expect_true(hashbeginning != hashend)
})
```

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