The possessive form of the singular noun roommate is roommate's.
Example: My roommate's name is Alex.
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The singular possessive form of "test" is "test's".
The singular possessive pronouns are "my," "mine," "your," "yours," "his," "her," and "its."
Taco's is the singular possessive.
The singular possessive form of "classmate" is "classmate's."
The singular possessive of penny is penny's, as in "penny's worth".