[SPARK-8451] [SPARK-7287] SparkSubmitSuite should check exit code

This patch also reenables the tests. Now that we have access to the log4j logs it should be easier to debug the flakiness.

yhuai brkyvz

Author: Andrew Or <andrew@databricks.com>

Closes #6886 from andrewor14/spark-submit-suite-fix and squashes the following commits:

3f99ff1 [Andrew Or] Move destroy to finally block
9a62188 [Andrew Or] Re-enable ignored tests
2382672 [Andrew Or] Check for exit code

core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala

@@ -325,7 +325,7 @@ class SparkSubmitSuite
     runSparkSubmit(args)
   }
 
-  ignore("includes jars passed in through --jars") {
+  test("includes jars passed in through --jars") {
     val unusedJar = TestUtils.createJarWithClasses(Seq.empty)
     val jar1 = TestUtils.createJarWithClasses(Seq("SparkSubmitClassA"))
     val jar2 = TestUtils.createJarWithClasses(Seq("SparkSubmitClassB"))
@@ -340,7 +340,7 @@ class SparkSubmitSuite
   }
 
   // SPARK-7287
-  ignore("includes jars passed in through --packages") {
+  test("includes jars passed in through --packages") {
     val unusedJar = TestUtils.createJarWithClasses(Seq.empty)
     val main = MavenCoordinate("my.great.lib", "mylib", "0.1")
     val dep = MavenCoordinate("my.great.dep", "mylib", "0.1")
@@ -499,9 +499,16 @@ class SparkSubmitSuite
       Seq("./bin/spark-submit") ++ args,
       new File(sparkHome),
       Map("SPARK_TESTING" -> "1", "SPARK_HOME" -> sparkHome))
-    failAfter(60 seconds) { process.waitFor() }
-    // Ensure we still kill the process in case it timed out
-    process.destroy()
+
+    try {
+      val exitCode = failAfter(60 seconds) { process.waitFor() }
+      if (exitCode != 0) {
+        fail(s"Process returned with exit code $exitCode. See the log4j logs for more detail.")
+      }
+    } finally {
+      // Ensure we still kill the process in case it timed out
+      process.destroy()
+    }
   }
 
   private def forConfDir(defaults: Map[String, String]) (f: String => Unit) = {