1 files changed, 85 insertions, 0 deletions
diff --git a/src/arrow/r/tests/testthat/test-message-reader.R b/src/arrow/r/tests/testthat/test-message-reader.R
new file mode 100644
index 000000000..44f3fe4f7
--- /dev/null
+++ b/src/arrow/r/tests/testthat/test-message-reader.R
@@ -0,0 +1,85 @@
+# 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("MessageReader can be created from raw vectors", {
+  batch <- record_batch(x = 1:10)
+  bytes <- batch$serialize()
+
+  reader <- MessageReader$create(bytes)
+
+  message <- reader$ReadNextMessage()
+  expect_r6_class(message, "Message")
+  expect_equal(message$type, MessageType$RECORD_BATCH)
+  expect_r6_class(message$body, "Buffer")
+  expect_r6_class(message$metadata, "Buffer")
+
+  message <- reader$ReadNextMessage()
+  expect_null(message)
+
+  schema <- schema(x = int32())
+  bytes <- schema$serialize()
+
+  reader <- MessageReader$create(bytes)
+
+  message <- reader$ReadNextMessage()
+  expect_r6_class(message, "Message")
+  expect_equal(message$type, MessageType$SCHEMA)
+  expect_r6_class(message$body, "Buffer")
+  expect_r6_class(message$metadata, "Buffer")
+
+  message <- reader$ReadNextMessage()
+  expect_null(message)
+})
+
+test_that("MessageReader can be created from input stream", {
+  batch <- record_batch(x = 1:10)
+  bytes <- batch$serialize()
+
+  stream <- BufferReader$create(bytes)
+  expect_r6_class(stream, "BufferReader")
+
+  reader <- MessageReader$create(stream)
+  expect_r6_class(reader, "MessageReader")
+
+  message <- reader$ReadNextMessage()
+  expect_r6_class(message, "Message")
+  expect_equal(message$type, MessageType$RECORD_BATCH)
+  expect_r6_class(message$body, "Buffer")
+  expect_r6_class(message$metadata, "Buffer")
+
+  message <- reader$ReadNextMessage()
+  expect_null(message)
+
+  schema <- schema(x = int32())
+  bytes <- schema$serialize()
+
+  stream <- BufferReader$create(bytes)
+  expect_r6_class(stream, "BufferReader")
+
+  reader <- MessageReader$create(stream)
+  expect_r6_class(reader, "MessageReader")
+
+  message <- reader$ReadNextMessage()
+  expect_r6_class(message, "Message")
+  expect_equal(message$type, MessageType$SCHEMA)
+  expect_r6_class(message$body, "Buffer")
+  expect_r6_class(message$metadata, "Buffer")
+
+  message <- reader$ReadNextMessage()
+  expect_null(message)
+})