code wise and Editor wise testing methods, free tools ,steps

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Hi All,
I Develop MFC applications frequently ,a coding wise my flow goes correct but problem arises when i deal with testing perspective.

That is,
I want to test each and every part of my software coding wise or editor wise.

Like,

in coding wise

a below line of code may gives me assertion ,

CStringArray strTest;
strTest.RemoveAll();
strTest.ElementAt(0);

Gives me assertion

so is there any tool,methods or a steps to avoid such things.