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test_that("initialization", {
AC <- R6Class("AC",
portable = TRUE,
public = list(
x = 1,
initialize = function(x, y) {
self$x <- self$getx() + x # Assign to self; also access a method
private$y <- y # Assign to private
},
getx = function() self$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 = TRUE, public = list(x = 1))
expect_error(AC$new(3))
})
test_that("empty members and methods are allowed", {
# No initialize method: throw error if arguments are passed in
AC <- R6Class("AC", portable = TRUE)
expect_no_error(AC$new())
})
test_that("Private members are private, and self/private environments", {
AC <- R6Class("AC",
portable = TRUE,
public = list(
x = 1,
gety = function() private$y,
getx = function() self$x,
getx2 = function() private$getx_priv(),
getself = function() self,
getprivate = function() private
),
private = list(
y = 2,
getx_priv = function() self$x
)
)
A <- AC$new()
# Environment structure
expect_identical(A$getself(), A)
expect_identical(parent.env(A), emptyenv())
# The private binding environment contains private fields
private_bind_env <- A$getprivate()
expect_identical(ls(private_bind_env), c("getx_priv", "y"))
expect_identical(parent.env(private_bind_env), emptyenv())
# Eval environment for public methods
eval_env <- environment(A$getx)
expect_identical(parent.env(eval_env), environment())
expect_identical(eval_env$self, A)
expect_identical(eval_env$private, A$getprivate())
# Eval environment for private methods should be the same
expect_identical(eval_env, environment(A$getprivate()$getx_priv))
# Behavioral tests
expect_identical(A$x, 1)
expect_null(A$y)
expect_null(A$getx_foo)
expect_identical(A$gety(), 2) # Explicit access: private$y
expect_identical(A$getx(), 1) # Explicit access: self$x
expect_identical(A$getx2(), 1) # Indirect access: private$getx_priv()
})
test_that("Private methods exist even when no private fields", {
AC <- R6Class("AC",
portable = TRUE,
public = list(
x = 1,
getx = function() self$x,
getx2 = function() private$getx_priv(),
getself = function() self,
getprivate = function() private
),
private = list(
getx_priv = function() self$x
)
)
A <- AC$new()
# The private binding environment contains private fields
private_bind_env <- A$getprivate()
expect_identical(ls(private_bind_env), "getx_priv")
expect_identical(parent.env(private_bind_env), emptyenv())
})
test_that("Active bindings work", {
AC <- R6Class("AC",
portable = TRUE,
public = list(
x = 5
),
active = list(
x2 = function(value) {
if (missing(value)) return(self$x * 2)
else self$x <- value/2
},
sqrt_of_x = function(value) {
if (!missing(value))
# In "setter" role
stop("Sorry this is a read-only variable.")
else {
# In "getter" role
if (self$x < 0) stop("The requested value is not available.")
else sqrt(self$x)
}
}
)
)
A <- AC$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)
A$x <- -2
expect_error(A$sqrt_of_x)
# print does not throw an error trying to read
# the active binding variables
muted_print <- function(x) capture.output(print(x))
expect_no_error(muted_print(A))
})
test_that("Locking works", {
AC <- R6Class("AC",
portable = FALSE,
public = list(x = 1, getx = function() self$x),
private = list(y = 2, gety = function() self$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)
})
|
