R: Turn a Check into a Test

makeTest {checkmate}

R Documentation

Turn a Check into a Test

Description

makeTest is the internal function used to evaluate the result of a check and throw an exception if necessary. This function is currently only a stub and just calls isTRUE. makeTestFunction can be used to automatically create an assertion function based on a check function (see example).

Usage

makeTest(res)

makeTestFunction(check.fun, c.fun = NULL, env = parent.frame())

Arguments

`res`	[`TRUE` \| `character(1)`] The result of a check function: `TRUE` for successful checks, and an error message as string otherwise.
`check.fun`	[`function`] Function which checks the input. Must return `TRUE` on success and a string with the error message otherwise.
`c.fun`	[`character(1)`] If not `NULL`, instead of calling the function `check.fun`, use `.Call` to call a C function “c.fun” with the identical set of parameters. The C function must be registered as a native symbol, see `.Call`. Useful if `check.fun` is just a simple wrapper.
`env`	[`environment`] The environment of the created function. Default is the `parent.frame`.

Value

makeTest returns TRUE if the check is successful and FALSE otherwise. makeTestFunction returns a function.

Examples

# Simple custom check function
checkFalse = function(x) if (!identical(x, FALSE)) "Must be FALSE" else TRUE

# Create the respective test function
testFalse = function(x) {
  res = checkFalse(x)
  makeTest(res)
}

# Alternative: Automatically create such a function
testFalse = makeTestFunction(checkFalse)
print(testFalse)