How to pass MEM-02?

I have a strange problem with Symbian Signed test tool. After step 14(MEM-02) it says:
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Testing aborted:
User cancelled testing.
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Well, I didn't.
The log file says:
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OK GEN-02 Stress Test.
OK Run tested app while sending rapid key events.

not run MEM-02 Low Storage Memory During Execution.
FAIL App can be run while storage mem is low & will not fill storage.
OK Close app before test, in case running already.
FAIL Running of app recording. Should not terminate unexpectedly.

not run PHN-01 Service Interruption. (call, SMS, MMS, alarm, charger)
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The place where my application crashes is here:
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//make sure there is at least 1MB free on the installation drive
if(aDriveInfo.iFree<1048576)
User::Leave(KErrDiskFull);
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It shows a proper system message, which should be ok to handle low mem situations according to SyS documentation.[quote]The application either runs successfully or provides appropriate warning messages to the user to explain why it cannot run.[/quote] So why does the tool stop? I never reach test 15.