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test_that("initialization", {
AC <- R6Class("AC",
portable = FALSE,
public = list(
x = 1,
initialize = function(x, y) {
self$x <- getx() + x # Assign to self; also access a method
private$y <- y # Assign to private
},
getx = function() x,
gety = function() private$y
),
private = list(
y = 2
)
)
A <- AC$new(2, 3)
expect_identical(A$x, 3)
expect_identical(A$gety(), 3)
# No initialize method: throw error if arguments are passed in
AC <- R6Class("AC", portable = FALSE, public = list(x = 1))
expect_error(AC$new(3))
})
test_that("empty members and methods are allowed", {
# No initialize method: throw error if arguments are passed in
AC <- R6Class("AC", portable = FALSE)
expect_no_error(AC$new())
})
test_that("Private members are private, and self/private environments", {
AC <- R6Class("AC",
portable = FALSE,
public = list(
x = 1,
gety = function() private$y,
gety2 = function() y,
getx = function() self$x,
getx2 = function() x,
getx3 = function() getx_priv3(),
getx4 = function() getx_priv4()
),
private = list(
y = 2,
getx_priv3 = function() self$x,
getx_priv4 = function() x
)
)
A <- AC$new()
# Environment structure
expect_identical(A$self, A)
expect_identical(A$private, parent.env(A))
# Enclosing env for fublic and private methods is the public env
expect_identical(A, environment(A$getx))
expect_identical(A, environment(A$private$getx_priv3))
# Behavioral tests
expect_identical(A$x, 1)
expect_null(A$y)
expect_error(A$getx_priv3())
expect_identical(A$gety(), 2) # Explicit access: private$y
expect_identical(A$gety2(), 2) # Implicit access: y
expect_identical(A$getx(), 1) # Explicit access: self$x
expect_identical(A$getx2(), 1) # Implicit access: x
expect_identical(A$getx3(), 1) # Call private method, which has explicit: self$x
expect_identical(A$getx4(), 1) # Call private method, which has implicit: x
})
test_that("Active bindings work", {
AC <- R6Class("AC",
portable = FALSE,
public = list(
x = 5
),
active = list(
x2 = function(value) {
if (missing(value)) return(x * 2)
else x <<- value/2
}
)
)
A <- AC$new()
expect_identical(A$x2, 10)
A$x <- 20
expect_identical(A$x2, 40)
A$x2 <- 60
expect_identical(A$x2, 60)
expect_identical(A$x, 30)
})
test_that("Locking objects", {
AC <- R6Class("AC",
portable = FALSE,
public = list(x = 1, getx = function() x),
private = list(y = 2, gety = function() y),
lock_objects = TRUE
)
A <- AC$new()
# Can modify fields
expect_no_error(A$x <- 5)
expect_identical(A$x, 5)
expect_no_error(A$private$y <- 5)
expect_identical(A$private$y, 5)
# Can't modify methods
expect_error(A$getx <- function() 1)
expect_error(A$gety <- function() 2)
# Can't add members
expect_error(A$z <- 1)
expect_error(A$private$z <- 1)
# Not locked
AC <- R6Class("AC",
portable = FALSE,
public = list(x = 1, getx = function() x),
private = list(y = 2, gety = function() y),
lock_objects = FALSE
)
A <- AC$new()
# Can modify fields
expect_no_error(A$x <- 5)
expect_identical(A$x, 5)
expect_no_error(A$private$y <- 5)
expect_identical(A$private$y, 5)
# Can't modify methods
expect_error(A$getx <- function() 1)
expect_error(A$private$gety <- function() 2)
# Can add members
expect_no_error(A$z <- 1)
expect_identical(A$z, 1)
expect_no_error(A$private$z <- 1)
expect_identical(A$private$z, 1)
})
test_that("Validity checks on creation", {
fun <- function() 1 # Dummy function for tests
# All arguments must be named
expect_error(R6Class("AC", public = list(1)))
expect_error(R6Class("AC", private = list(1)))
expect_error(R6Class("AC", active = list(fun)))
# Names can't be duplicated
expect_error(R6Class("AC", public = list(a=1, a=2)))
expect_error(R6Class("AC", public = list(a=1), private = list(a=1)))
expect_error(R6Class("AC", private = list(a=1), active = list(a=fun)))
# Reserved names
expect_error(R6Class("AC", public = list(self = 1)))
expect_error(R6Class("AC", private = list(private = 1)))
expect_error(R6Class("AC", active = list(super = 1)))
# `initialize` only allowed in public
expect_error(R6Class("AC", private = list(initialize = fun)))
expect_error(R6Class("AC", active = list(initialize = fun)))
})
test_that("default print method has a trailing newline", {
## This is kind of hackish, because both capture.output and
## expect_output drop the trailing newline. This function
## does not work in the general case, but it is good enough
## for this test.
expect_output_n <- function(object) {
tmp <- tempfile()
on.exit(unlink(tmp))
sink(tmp)
print(object)
sink(NULL)
output <- readChar(tmp, nchars = 10000)
last_char <- substr(output, nchar(output), nchar(output))
expect_identical(last_char, "\n")
}
AC <- R6Class("AC")
expect_output_n(print(AC))
A <- AC$new()
expect_output_n(print(A))
AC <- R6Class("AC", private = list( x = 2 ))
expect_output_n(print(AC))
A <- AC$new()
expect_output_n(print(A))
})
|
