All 4 Uses of

mock
in
A Raisin in the Sun

(When she speaks to him, her voice has become a very gentle tease)
RUTH: (Mocking; as she thinks he would say it) Oh, Mama makes me so mad sometimes, I don't know what to do!
Scene 1.1 *

mocking = imitating to make fun of

(He laughs) BENEATHA: (Turning to him, not laughing) Yes—(Her face is quizzical, profoundly disturbed) ASAGAI: (Still teasing and reaching out and taking her face in his hands and turning her profile to him) Well ....it is true that this is not so much a profile of a Hollywood queen as perhaps a queen of the Nile—(A mock dismissal of the importance of the question) But what does it matter†
Scene 1.2 *

Cure the Great Sore of Colonialism—(Loftily, mocking it) with the Penicillin of Independence—!†
Scene 3.1

Definitions:

(1) (mock as in: don't mock me)
make fun of (ridicule--sometimes by imitating in an exaggerated manner)

or (more rarely): just to make fun or to be ridiculous without targeting anyone as a victim

These senses of mockery come together when a comedian pokes fun at a politician by pretending to be the politician and saying ridiculous things.
(2) (mock as in: a mock trial)
not real
(3) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, mock can refer to a way of preparing food. Mockers can be an abbreviation for mockingbirds.