[SPARK-12034][SPARKR] Eliminate warnings in SparkR test cases.

This PR:
1. Suppress all known warnings.
2. Cleanup test cases and fix some errors in test cases.
3. Fix errors in HiveContext related test cases. These test cases are actually not run previously due to a bug of creating TestHiveContext.
4. Support 'testthat' package version 0.11.0 which prefers that test cases be under 'tests/testthat'
5. Make sure the default Hadoop file system is local when running test cases.
6. Turn on warnings into errors.

Author: Sun Rui <rui.sun@intel.com>

Closes #10030 from sun-rui/SPARK-12034.

1 files changed, 114 insertions, 0 deletions

diff --git a/R/pkg/inst/tests/testthat/test_context.R b/R/pkg/inst/tests/testthat/test_context.R
new file mode 100644
index 0000000000..1707e314be
--- /dev/null
+++ b/R/pkg/inst/tests/testthat/test_context.R
@@ -0,0 +1,114 @@
+#
+# 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.
+#
+
+context("test functions in sparkR.R")
+
+test_that("repeatedly starting and stopping SparkR", {
+  for (i in 1:4) {
+    sc <- sparkR.init()
+    rdd <- parallelize(sc, 1:20, 2L)
+    expect_equal(count(rdd), 20)
+    sparkR.stop()
+  }
+})
+
+test_that("repeatedly starting and stopping SparkR SQL", {
+  for (i in 1:4) {
+    sc <- sparkR.init()
+    sqlContext <- sparkRSQL.init(sc)
+    df <- createDataFrame(sqlContext, data.frame(a = 1:20))
+    expect_equal(count(df), 20)
+    sparkR.stop()
+  }
+})
+
+test_that("rdd GC across sparkR.stop", {
+  sparkR.stop()
+  sc <- sparkR.init() # sc should get id 0
+  rdd1 <- parallelize(sc, 1:20, 2L) # rdd1 should get id 1
+  rdd2 <- parallelize(sc, 1:10, 2L) # rdd2 should get id 2
+  sparkR.stop()
+
+  sc <- sparkR.init() # sc should get id 0 again
+
+  # GC rdd1 before creating rdd3 and rdd2 after
+  rm(rdd1)
+  gc()
+
+  rdd3 <- parallelize(sc, 1:20, 2L) # rdd3 should get id 1 now
+  rdd4 <- parallelize(sc, 1:10, 2L) # rdd4 should get id 2 now
+
+  rm(rdd2)
+  gc()
+
+  count(rdd3)
+  count(rdd4)
+})
+
+test_that("job group functions can be called", {
+  sc <- sparkR.init()
+  setJobGroup(sc, "groupId", "job description", TRUE)
+  cancelJobGroup(sc, "groupId")
+  clearJobGroup(sc)
+})
+
+test_that("getClientModeSparkSubmitOpts() returns spark-submit args from whitelist", {
+  e <- new.env()
+  e[["spark.driver.memory"]] <- "512m"
+  ops <- getClientModeSparkSubmitOpts("sparkrmain", e)
+  expect_equal("--driver-memory \"512m\" sparkrmain", ops)
+
+  e[["spark.driver.memory"]] <- "5g"
+  e[["spark.driver.extraClassPath"]] <- "/opt/class_path" # nolint
+  e[["spark.driver.extraJavaOptions"]] <- "-XX:+UseCompressedOops -XX:+UseCompressedStrings"
+  e[["spark.driver.extraLibraryPath"]] <- "/usr/local/hadoop/lib" # nolint
+  e[["random"]] <- "skipthis"
+  ops2 <- getClientModeSparkSubmitOpts("sparkr-shell", e)
+  # nolint start
+  expect_equal(ops2, paste0("--driver-class-path \"/opt/class_path\" --driver-java-options \"",
+                      "-XX:+UseCompressedOops -XX:+UseCompressedStrings\" --driver-library-path \"",
+                      "/usr/local/hadoop/lib\" --driver-memory \"5g\" sparkr-shell"))
+  # nolint end
+
+  e[["spark.driver.extraClassPath"]] <- "/" # too short
+  ops3 <- getClientModeSparkSubmitOpts("--driver-memory 4g sparkr-shell2", e)
+  # nolint start
+  expect_equal(ops3, paste0("--driver-java-options \"-XX:+UseCompressedOops ",
+                      "-XX:+UseCompressedStrings\" --driver-library-path \"/usr/local/hadoop/lib\"",
+                      " --driver-memory 4g sparkr-shell2"))
+  # nolint end
+})
+
+test_that("sparkJars sparkPackages as comma-separated strings", {
+  expect_warning(processSparkJars(" a, b "))
+  jars <- suppressWarnings(processSparkJars(" a, b "))
+  expect_equal(jars, c("a", "b"))
+
+  jars <- suppressWarnings(processSparkJars(" abc ,, def "))
+  expect_equal(jars, c("abc", "def"))
+
+  jars <- suppressWarnings(processSparkJars(c(" abc ,, def ", "", "xyz", " ", "a,b")))
+  expect_equal(jars, c("abc", "def", "xyz", "a", "b"))
+
+  p <- processSparkPackages(c("ghi", "lmn"))
+  expect_equal(p, c("ghi", "lmn"))
+
+  # check normalizePath
+  f <- dir()[[1]]
+  expect_that(processSparkJars(f), not(gives_warning()))
+  expect_match(processSparkJars(f), f)
+})