new BrowserOperatingSystemMapping.Builder().setOperatingSystemId(null);
}
@Test
public void setOperatingSystemId_successful() {
final Builder b = new BrowserOperatingSystemMapping.Builder().setOperatingSystemId("12345");
assertThat(b.getOperatingSystemId()).isEqualTo(12345);
b.setOperatingSystemId(98765);
assertThat(b.getOperatingSystemId()).isEqualTo(98765);
}