I am a layman, and took Chemistry course over 40 years ago, so this answer will be temporary until a Chemist can improve it.
I suspect that in the first test tube [oil and water only] that there probably will be a partial break-up of the oil and some mixing into the water, but this will be temporary until the oil seperates, floats to the surface, and partially recombines.
In the case of the second test tube [oil, water, and soap] that the soap will reduce the surface tension of the oil, allowing it to break up into smaller particles, and possibly form a stable, or at least simi-stable emulsion in the water.
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