How much work experience required before sending assessment for skilled immigration for Australia?????......3 or 4????

hi i am Software Quality Engineer and do white box testing (testing at code level) on ASP.Net applications using C# code. I am not a Developer but tester and do testing at code level from the last 2 years (total experience 3 years) (means i have good knowledge of C#) As C# is included in MODL...... ...