Sean Owen created SPARK-2955:
--------------------------------

             Summary: Test code fails to compile with "mvn compile" without 
"install" 
                 Key: SPARK-2955
                 URL: https://issues.apache.org/jira/browse/SPARK-2955
             Project: Spark
          Issue Type: Bug
          Components: Build
    Affects Versions: 1.0.2
            Reporter: Sean Owen
            Priority: Minor


(This is the corrected follow-up to 
https://issues.apache.org/jira/browse/SPARK-2903 )

Right now, "mvn compile test-compile" fails to compile Spark. (Don't worry; 
"mvn package" works, so this is not major.) The issue stems from test code in 
some modules depending on test code in other modules. That is perfectly fine 
and supported by Maven.

It takes extra work to get this to work with scalatest, and this has been 
attempted: https://github.com/apache/spark/blob/master/sql/catalyst/pom.xml#L86

This formulation is not quite enough, since the SQL Core module's tests fail to 
compile for lack of finding test classes in SQL Catalyst, and likewise for most 
Streaming integration modules depending on core Streaming test code. Example:

{code}
[error] 
/Users/srowen/Documents/spark/sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala:23:
 not found: type PlanTest
[error] class QueryTest extends PlanTest {
[error]                         ^
[error] 
/Users/srowen/Documents/spark/sql/core/src/test/scala/org/apache/spark/sql/CachedTableSuite.scala:28:
 package org.apache.spark.sql.test is not a value
[error]   test("SPARK-1669: cacheTable should be idempotent") {
[error]   ^
...
{code}

The issue I believe is that generation of a test-jar is bound here to the 
compile phase, but the test classes are not being compiled in this phase. It 
should bind to the test-compile phase.

It works when executing "mvn package" or "mvn install" since test-jar artifacts 
are actually generated available through normal Maven mechanisms as each module 
is built. They are then found normally, regardless of scalatest configuration.

It would be nice for a simple "mvn compile test-compile" to work since the test 
code is perfectly compilable given the Maven declarations.

On the plus side, this change is low-risk as it only affects tests.
[~yhuai] made the original scalatest change and has glanced at this and thinks 
it makes sense.



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