There are some testing Axioms they are:

1. It is Impossible to Test a Program Completely

Reasons:

• There may be a large number of possible inputs.

• There may be a large number of possible outputs.

• There may be different paths to design a software based on users requirements.

• It is completely based on specifications of the software.

2. Software Testing is One of the Risk Based Exercise

Reasons:

• If you test the software completely it increases the cost for testing

• If you leave some aspects in the testing there may be chances of occurring of errors

• If your skipped part has errors it may cause a risk these risks includes:

• Financial loss,security loss,money loss or loss of a life! We can't predict the type of risk.

• If you test too little of the software,the probability of software failure may increase.

• Software testing takes so much time.

3. Testing cannot show the absence of bugs

Reasons:

• We can't guarantee that a software has not bugs

• In every software there may be minute bugs that may be visible or invisible.

• Can you guarantee that there are no bugs?

4. The more bugs you find ,the more bugs there are

Reasons:

• May be programmers sometimes have bad days

• If you try to fix one bug,there may be chances of gettings some other bugs

• Usually programmers make some mistakes in overflow that may lead to new bugs. 

• We will take care of these things when you are testing a software.