@Test
public void buildFromPropertiesFile_readsFromPropertiesFile() throws IOException {

  File propertiesFile = folder.newFile("ads.properties");
  try (FileWriter propertiesFileWriter = new FileWriter(propertiesFile)) {
    testProperties.store(propertiesFileWriter, null);
  }
  Builder builder = GoogleAdsClient.newBuilder();
  builder.setConfigurationFileSupplier(() -> propertiesFile);
  GoogleAdsClient client = builder.fromPropertiesFile().build();
  assertGoogleAdsClient(client);
}