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context("PyClass")
test_that("Can create a Python class and call methods", {
skip_if_no_python()
Hi <- PyClass("Hi", list(
name = NULL,
`__init__` = function(self, name) {
self$name <- name
NULL
},
say_hi = function(self) {
paste0("Hi ", self$name)
}
))
a <- Hi("World")
b <- Hi("R")
expect_equal(a$say_hi(), "Hi World")
expect_equal(b$say_hi(), "Hi R")
})
test_that("Can inherit from another class created in R", {
skip_if_no_python()
Hi <- PyClass("Hi", list(
name = NULL,
`__init__` = function(self, name) {
self$name <- name
NULL
},
say_hi = function(self) {
paste0("Hi ", self$name)
}
))
Hello <- PyClass("Hello", inherit = Hi, list(
say_hello = function(self) {
paste0("Hello and ", super()$say_hi())
}
))
a <- Hello("World")
expect_equal(a$say_hello(), "Hello and Hi World")
})
test_that("Can inherit from a Python class", {
skip_if_no_python()
py <- reticulate::py_run_string("
class Person(object):
def __init__ (self, name):
self.name = name
")
Person2 <- PyClass("Person2", inherit = py$Person, list(
`__init__` = function(self, name) {
super()$`__init__`(name)
self$test <- name
NULL
}
))
a <- Person2("World")
expect_equal(a$name, "World")
expect_equal(a$test, "World")
})
test_that("Can inherit from multiple Python classes", {
skip_if_no_python()
py <- reticulate::py_run_string("
class Clock(object):
def __init__ (self, time):
self.time = time
class Calendar(object):
def __init__ (self, date):
self.date = date
")
ClockCalendar <- PyClass("ClockCalendar", inherit = list(py$Clock, py$Calendar), list(
`__init__` = function(self, time, date) {
py$Clock$`__init__`(self, time)
py$Calendar$`__init__`(self, date)
}
))
a <- ClockCalendar("15:54", "2019-11-05")
expect_equal(a$date, "2019-11-05")
expect_equal(a$time, "15:54")
})
test_that("Can define and instantiate empty classes", {
skip_if_no_python()
Hi <- PyClass("Hi")
x <- Hi()
x$name <- "Hi"
expect_s3_class(x, "Hi")
expect_equal(x$name, "Hi")
})
test_that("Methods can access enclosed env", {
skip_if_no_python()
Hi <- PyClass("Hi", list(
say_a = function(self) {
a
}
))
x <- Hi()
a <- 1
expect_equal(x$say_a(), 1)
a <- 2
expect_equal(x$say_a(), 2)
})
test_that("Can directly access variables from a class", {
skip_if_no_python()
bt <- import_builtins()
Hi <- PyClass("Hi", list(
`__init__` = function(self, a) {
self$a <- a
self$x <- bt$isinstance # Have a python that can't be
# converted to an R type
NULL
},
add_2 = function(self) {
self$a + 2
},
get_class = function(self) {
class(self$a)
},
add_n = function(self, n) {
self$a + n
}
))
x <- Hi(a = 2)
expect_equal(x$add_2(), 4)
expect_equal(x$a, 2)
expect_equal(x$get_class(), "numeric")
expect_equal(x$add_n(10), 12)
})
test_that("Properties are automatically converted in inherited classes", {
skip_if_no_python()
bt <- import_builtins(convert = FALSE)
p <- py_run_string("
class Base(object):
def __init__ (self, x):
self.x = 1
", convert = FALSE)
Hi <- PyClass("Hi", inherit = p$Base, list(
`__init__` = function(self, a, ...) {
self$a <- a
self$k <- bt$isinstance # Have a python that can't be
# converted to an R type
super()$`__init__`(...)
},
add_2 = function(self) {
self$a + 2
},
get_class = function(self) {
class(self$a)
},
add_n = function(self, n) {
self$a + n
}
))
x <- Hi(a = 2, x = 1)
expect_equal(x$add_2(), 4)
expect_equal(x$a, 2)
expect_equal(x$get_class(), "numeric")
expect_equal(x$add_n(10), 12)
})
test_that("self is not converted when there's a py_to_r method for it", {
skip_if_no_python()
bt <- import_builtins(convert = FALSE)
Base <- PyClass("Base")
Hi <- PyClass("Hi", inherit = Base, list(
`__init__` = function(self, a) {
self$a <- a
NULL
},
add_2 = function(self) {
self$a + 2
}
))
assign("py_to_r.Base", value = function(x) {
"base"
}, envir = .GlobalEnv)
x <- Hi(2)
expect_equal(x, "base")
rm(py_to_r.Base, envir = .GlobalEnv)
})
test_that("can call super from an inherited class", {
Base1 <- PyClass("Base1", list(`__init__` = function(self, a) {
self$a <- a
}))
Base2 <- PyClass("Base2", list(`__init__` = function(self, a, b) {
self$b <- b
super()$`__init__`(a)
}), inherit = Base1)
Inhe <- PyClass("Inhe", inherit = Base2, list(
`__init__` = function(self, a, b, c) {
self$c <- c
super()$`__init__`(a, b)
NULL
}
))
x <- Inhe(10, 20, 30)
expect_equal(x$a, 10)
expect_equal(x$b, 20)
expect_equal(x$c, 30)
})
|
