### Question:
SystemProperties { public String getOsArch() { return getSystemProperty(OS_ARCH); }  String getOsName(); String getOsVersion(); String getOsArch(); List<String> getPath();  }### Answer:
@Test public void getOsArch() { String original = System.getProperty("os.arch"); System.setProperty("os.arch", "x64"); assertThat(systemProperties.getOsArch()).isEqualTo("x64"); System.setProperty("os.arch", original); }