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test_that("Inheritance", {
AC <- R6Class("AC",
portable = FALSE,
public = list(
x = 0,
z = 0,
initialize = function(x) self$x <- x,
getx = function() x,
getx2 = function() x*2
),
private = list(
getz = function() z,
getz2 = function() z*2
),
active = list(
x2 = function(value) {
if (missing(value)) return(x * 2)
else x <<- value/2
},
x3 = function(value) {
if (missing(value)) return(x * 3)
else x <<- value/3
}
)
)
BC <- R6Class("BC",
portable = FALSE,
inherit = AC,
public = list(
y = 0,
z = 3,
initialize = function(x, y) {
super$initialize(x)
self$y <- y
},
getx = function() x + 10
),
private = list(
getz = function() z + 10
),
active = list(
x2 = function(value) {
if (missing(value)) return(x + 2)
else x <<- value-2
}
)
)
B <- BC$new(1, 2)
# Environment checks
expect_identical(B, environment(B$getx)) # Overridden public method
expect_identical(B, parent.env(environment(B$getx2))) # Inherited public method
expect_identical(B, environment(B$private$getz)) # Overridden private method
expect_identical(B, parent.env(environment(B$private$getz2))) # Inherited private method
# Behavioral tests
# Overriding literals
expect_identical(B$x, 1)
expect_identical(B$y, 2)
expect_identical(B$z, 3) # Subclass value overrides superclass value
# Methods
expect_identical(B$getx(), 11) # Overridden public method
expect_identical(B$getx2(), 2) # Inherited public method
expect_identical(B$private$getz(), 13) # Overriden private method
expect_identical(B$private$getz2(), 6) # Inherited private method
# Active bindings
expect_identical(B$x2, 3) # Overridden
expect_identical(B$x3, 3) # Inherited
# Classes
expect_identical(class(B), c("BC", "AC", "R6"))
})
test_that("Inheritance: superclass methods", {
AC <- R6Class("AC",
portable = FALSE,
public = list(
x = 0,
initialize = function() {
inc_x()
inc_self_x()
inc_y()
inc_self_y()
incz
},
inc_x = function() x <<- x + 1,
inc_self_x = function() self$x <- self$x + 10,
inc = function(val) val + 1,
pinc = function(val) priv_inc(val), # Call private inc method
z = 0
),
private = list(
y = 0,
inc_y = function() y <<- y + 1,
inc_self_y = function() private$y <- private$y + 10,
priv_inc = function(val) val + 1
),
active = list(
incz = function(value) {
z <<- z + 1
}
)
)
BC <- R6Class("BC",
portable = FALSE,
inherit = AC,
public = list(
inc_x = function() x <<- x + 2,
inc_self_x = function() self$x <- self$x + 20,
inc = function(val) super$inc(val) + 20
),
private = list(
inc_y = function() y <<- y + 2,
inc_self_y = function() private$y <- private$y + 20,
priv_inc = function(val) super$priv_inc(val) + 20
),
active = list(
incz = function(value) {
z <<- z + 2
}
)
)
B <- BC$new()
# Environment checks
expect_identical(parent.env(B$super), emptyenv())
# Enclosing env for functions in $super is a child of $self
expect_identical(parent.env(environment(B$super$inc_x)), B)
# Testing overrides
expect_identical(B$x, 22) # Public
expect_identical(B$private$y, 22) # Private
expect_identical(B$z, 2) # Active
# Calling superclass methods
expect_identical(B$inc(0), 21)
expect_identical(B$pinc(0), 21)
# Multi-level inheritance
CC <- R6Class("CC",
portable = FALSE,
inherit = BC,
public = list(
inc_x = function() x <<- x + 3,
inc_self_x = function() self$x <- self$x + 30,
inc = function(val) super$inc(val) + 300
),
private = list(
inc_y = function() y <<- y + 3,
inc_self_y = function() private$y <- private$y + 30,
priv_inc = function(val) super$priv_inc(val) + 300
),
active = list(
incz = function(value) {
z <<- z + 3
}
)
)
C <- CC$new()
# Testing overrides
expect_identical(C$x, 33) # Public
expect_identical(C$private$y, 33) # Private
expect_identical(C$z, 3) # Active
# Calling superclass methods (two levels)
expect_identical(C$inc(0), 321)
expect_identical(C$pinc(0), 321)
# Classes
expect_identical(class(C), c("CC", "BC", "AC", "R6"))
})
test_that("Inheritance hierarchy for super$ methods", {
AC <- R6Class("AC",
portable = FALSE,
public = list(n = function() 0 + 1)
)
expect_identical(AC$new()$n(), 1)
BC <- R6Class("BC",
portable = FALSE,
public = list(n = function() super$n() + 10),
inherit = AC
)
expect_identical(BC$new()$n(), 11)
CC <- R6Class("CC",
portable = FALSE,
inherit = BC
)
# This should equal 11 because it inherits BC's n(), which adds 1 to AC's n()
expect_identical(CC$new()$n(), 11)
# Skipping one level of inheritance ---------------------------------
AC <- R6Class("AC",
portable = FALSE,
public = list(n = function() 0 + 1)
)
expect_identical(AC$new()$n(), 1)
BC <- R6Class("BC",
portable = FALSE,
inherit = AC
)
expect_identical(BC$new()$n(), 1)
CC <- R6Class("CC",
portable = FALSE,
public = list(n = function() super$n() + 100),
inherit = BC
)
# This should equal 101 because BC inherits AC's n()
expect_identical(CC$new()$n(), 101)
DC <- R6Class("DC",
portable = FALSE,
inherit = CC
)
# This should equal 101 because DC inherits CC's n(), and BC inherits AC's n()
expect_identical(DC$new()$n(), 101)
# Skipping two level of inheritance ---------------------------------
AC <- R6Class("AC",
portable = FALSE,
public = list(n = function() 0 + 1)
)
expect_identical(AC$new()$n(), 1)
BC <- R6Class("BC", portable = FALSE, inherit = AC)
expect_identical(BC$new()$n(), 1)
CC <- R6Class("CC", portable = FALSE, inherit = BC)
expect_identical(CC$new()$n(), 1)
})
test_that("Private env is created when all private members are inherited", {
# Private contains fields only
AC <- R6Class("AC",
portable = FALSE,
public = list(
getx = function() x,
getx2 = function() private$x
),
private = list(x = 1)
)
BC <- R6Class("BC", portable = FALSE, inherit = AC)
expect_identical(BC$new()$getx(), 1)
expect_identical(BC$new()$getx2(), 1)
# Private contains functions only
AC <- R6Class("AC",
portable = FALSE,
public = list(
getx = function() x(),
getx2 = function() private$x()
),
private = list(x = function() 1)
)
BC <- R6Class("BC", portable = FALSE, inherit = AC)
expect_identical(BC$new()$getx(), 1)
expect_identical(BC$new()$getx2(), 1)
})
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