AK: TestSuite: Define assert macros with do { } while(0). (#3292)

Consider the following scenario:

    if(condition)
        FOO();
    else
        bar();

Suppose FOO is defined as follows:

    #define FOO() { bar(); baz(); }

Then it expands to the following:

    if(condition)
        // Syntax error, we are not allowed to put a semicolon at the end.
        { bar(); baz(); };
    else
        bar();

If we define FOO as follows:

    #define FOO() do { bar(); baz(); } while(false)

Then it expands to the following:

    if(condition)
        do { bar(); baz(); } while(false);
    else
        bar();

Which is correct.

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