1 files changed, 97 insertions, 0 deletions
diff --git a/src/arrow/r/tests/testthat/test-buffer.R b/src/arrow/r/tests/testthat/test-buffer.R
new file mode 100644
index 000000000..9b3ebc6de
--- /dev/null
+++ b/src/arrow/r/tests/testthat/test-buffer.R
@@ -0,0 +1,97 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+test_that("Buffer can be created from raw vector", {
+  vec <- raw(123)
+  buf <- buffer(vec)
+  expect_r6_class(buf, "Buffer")
+  expect_equal(buf$size, 123)
+})
+
+test_that("Buffer can be created from integer vector", {
+  vec <- integer(17)
+  buf <- buffer(vec)
+  expect_r6_class(buf, "Buffer")
+  expect_equal(buf$size, 17 * 4)
+})
+
+test_that("Buffer can be created from numeric vector", {
+  vec <- numeric(17)
+  buf <- buffer(vec)
+  expect_r6_class(buf, "Buffer")
+  expect_equal(buf$size, 17 * 8)
+})
+
+test_that("Buffer can be created from complex vector", {
+  vec <- complex(3)
+  buf <- buffer(vec)
+  expect_r6_class(buf, "Buffer")
+  expect_equal(buf$size, 3 * 16)
+})
+
+test_that("buffer buffer buffers buffers", {
+  expect_r6_class(buffer(buffer(42)), "Buffer")
+})
+
+test_that("Other types can't be converted to Buffers", {
+  expect_error(
+    buffer(data.frame(a = "asdf")),
+    "Cannot convert object of class data.frame to arrow::Buffer"
+  )
+})
+
+test_that("can convert Buffer to raw", {
+  buf <- buffer(rnorm(10))
+  expect_equal(buf$data(), as.raw(buf))
+})
+
+test_that("can read remaining bytes of a RandomAccessFile", {
+  tbl <- tibble::tibble(
+    int = 1:10, dbl = as.numeric(1:10),
+    lgl = sample(c(TRUE, FALSE, NA), 10, replace = TRUE),
+    chr = letters[1:10]
+  )
+  tab <- Table$create(!!!tbl)
+
+  tf <- tempfile()
+  all_bytes <- write_feather(tab, tf)
+
+  file <- ReadableFile$create(tf)
+  expect_equal(file$tell(), 0)
+  x <- file$Read(20)$data()
+  expect_equal(file$tell(), 20)
+  y <- file$Read()$data()
+
+  file <- ReadableFile$create(tf)
+  z <- file$Read()$data()
+
+  file <- ReadableFile$create(tf)
+  a <- file$ReadAt(20)$data()
+
+  expect_equal(file$GetSize(), length(x) + length(y))
+  expect_equal(z, c(x, y))
+  expect_equal(a, y)
+})
+
+test_that("Buffer$Equals", {
+  vec <- integer(17)
+  buf1 <- buffer(vec)
+  buf2 <- buffer(vec)
+  expect_equal(buf1, buf2)
+  expect_true(buf1$Equals(buf2))
+  expect_false(buf1$Equals(vec))
+})