public String getInstall(String version) {
    if (!installs.containsKey(version) || installs.get(version) == null) {
      throw new IllegalArgumentException("unable to locate installation directory for " + version);
    }
    return installs.get(version);
  }
Returns the classpath for the given version, or null if the version is not valid. Use
{@link #CURRENT_VERSION} for the version in development.

@param version the version for which to return the classpath
@return the classpath for the given version
geode-junit/src/main/java/org/apache/geode/test/version/VersionManager.java