Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/747
If you see lines above, scalatest plugin works with scala-2.10 libraries.
```
[INFO]
------------------------------------------------------------------------
[INFO] Building Zeppelin: Display system apis 0.7.0-SNAPSHOT
[INFO]
------------------------------------------------------------------------
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.pom
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.pom
(2 KB at 31.2 KB/sec)
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scalatest/scalatest_2.10/2.2.4/scalatest_2.10-2.2.4.pom
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scalatest/scalatest_2.10/2.2.4/scalatest_2.10-2.2.4.pom
(6 KB at 210.9 KB/sec)
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-reflect/2.10.4/scala-reflect-2.10.4.pom
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-reflect/2.10.4/scala-reflect-2.10.4.pom
(2 KB at 86.2 KB/sec)
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.jar
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scalatest/scalatest_2.10/2.2.4/scalatest_2.10-2.2.4.jar
[INFO] Downloading:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-reflect/2.10.4/scala-reflect-2.10.4.jar
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-reflect/2.10.4/scala-reflect-2.10.4.jar
(3129 KB at 15260.4 KB/sec)
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scala-lang/scala-library/2.10.5/scala-library-2.10.5.jar
(6964 KB at 26886.7 KB/sec)
[INFO] Downloaded:
http://repo.maven.apache.org/maven2/org/scalatest/scalatest_2.10/2.2.4/scalatest_2.10-2.2.4.jar
(7358 KB at 25635.6 KB/sec)
```
It's because of `-Dscala-2.11` flag is not effective in testing.
I think you'll need move `-Dscala-2.11` (and `-Dscala-2.10`) flag from
`BUILD_FLAG` to `PROFILE` in .travis.yml
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