Tests failing with no changes - ShellScriptLauncherTest and SparkInterpreterLaunchTest

When I run all of the tests zeppelin-zengine in IntelliJ, the tests in ShellScriptLauncherTest and SparkInterpreterLaunchTest fail, but if I run these tests by themselves, they pass. The problem is some of the ConfVars are set (such as ZEPPELIN_HOME) in other tests, but ShellScripterLauncherTest.testLauncher expects that these variables are not set. To fix this, I have added a setUp() method that resets all of the ConfVars to both ShellScripterLauncherTest and SparkInterpreterLauncherTest.