@Test
public void testHttpHeadersProperties_multipleHeaders() {

  Configuration config = new Configuration();
  config.set(GCS_HTTP_HEADERS.getKey() + "test-header", "test-VAL");
  config.set(GCS_HTTP_HEADERS.getKey() + "key-in-header", "+G2Ap33m5NVOgmXznSGTEvG0I=");
  GoogleCloudStorageFileSystemOptions options =
      GoogleHadoopFileSystemConfiguration.getGcsFsOptionsBuilder(config).build();
  assertThat(options.getCloudStorageOptions().getHttpRequestHeaders())
      .containsExactly("test-header", "test-VAL", "key-in-header", "+G2Ap33m5NVOgmXznSGTEvG0I=");
}