Corrections to the new test cases

[sofiia-tesliuk]

No description provided.

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[schachmat]

Hm, these changes seem to have introduced a new test failure: --- FAIL: TestMixedModePath/mi_f6_od_nd.diff

[sofiia-tesliuk]

Sorry for the delay of correction.
@schachmat Please take a look on the comment about duplicate test case: #14

[kordianbruck]

Thanks!