static OsVersionTests()
{
// invoke the call and populate the backing field that we're going to replace
bool _ = OsVersion.IsWindows8_1OrGreater;
s_typeOsVersion = typeof(OsVersion);
s_fiVersionInfo = s_typeOsVersion.GetField("s_versionInfo", Reflection.BindingFlags.Static | Reflection.BindingFlags.NonPublic);
Assert.NotNull(s_fiVersionInfo);
s_realVersionInfo = (Interop.NtDll.RTL_OSVERSIONINFOEX)s_fiVersionInfo.GetValue(null);
}
private void PerformAssert(uint major, uint minor, uint buildNumber, Action assertion)
{
try
{
Interop.NtDll.RTL_OSVERSIONINFOEX verInfo = new Interop.NtDll.RTL_OSVERSIONINFOEX
{
dwMajorVersion = major,
dwMinorVersion = minor,
dwBuildNumber = buildNumber
};
s_fiVersionInfo.SetValue(null, verInfo);
assertion();
}
finally
{
// restore the real OS version
s_fiVersionInfo.SetValue(null, s_realVersionInfo);
}
}
