There are two accepted forms for possessive singular nouns ending in s:
Add an apostrophe (') after the existing s at the end of the word: Nicholas'
Add an apostrophe s ('s) after the existing s at the end of the word: Nicholas's
Examples:
Nicholas' graduation party is tonight.
Nicholas's graduation party is tonight.
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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."
The singular possessive form of "classmate" is "classmate's."
Taco's is the singular possessive.
The singular possessive of penny is penny's, as in "penny's worth".