check: Validate S3 classes from pensieve
In maxheld83/pensieve: Tools for the Scientific Study of Operant Subjectivity

Use check(), test(), assert(), expect() and need() to validate classed objects from this package.

Check S3 class.

check(x)

test(x)

## Default S3 method:
test(x)

expect(x, info = NULL, label = NULL)

## Default S3 method:
expect(x, info = NULL, label = paste(class(x), "S3 class"))

assert(x, collection = NULL, var.name = NULL)

## Default S3 method:
assert(x, collection = NULL, var.name = paste(class(x)[1], "S3 class"))

need(x, label = NULL)

## Default S3 method:
need(x, label = NULL)

`x`	class object created by respective constructor function.
`info`	[`character(1)`] See `expect_that`
`label`	[`character(1)`] See `expect_that`
`collection`	[`AssertCollection`] If an `AssertCollection` is provided, the error message is stored in it. If `NULL`, an exception is raised if `res` is not `TRUE`.
`var.name`	[`character(1)`] The custom name for `x` as passed to any `assert*` function. Defaults to a heuristic name lookup.