@Test public void testClusterSpecExports() throws Exception {
  PropertiesConfiguration conf=new PropertiesConfiguration();
  conf.addProperty("ignored","ignored_value");
  conf.addProperty("whirr.env.FOO_BAR","my_value");
  ClusterSpec clusterSpec=ClusterSpec.withTemporaryKeys(conf);
  clusterSpec.setClusterName("test-cluster");
  clusterSpec.setProvider("test-provider");
  StatementBuilder builder=new StatementBuilder();
  builder.addStatement(Statements.exec("echo $FOO_BAR"));
  String script=builder.name("foo").build(clusterSpec).render(OsFamily.UNIX);
  assertThat(script,containsString("export FOO_BAR="));
  assertThat(script,containsString("my_value"));
  assertThat(script,containsString("echo $FOO_BAR"));
  assertThat(script,not(containsString("ignored")));
}