How many test cases would be needed to achieve 100% decision coverage? 1 credit [K2]

The correct answer is A. 1. Option A (1 test case) is correct because the code or flowchart being referenced contains no decision points - no if/else, loops, or conditional branches. When there are zero decisions, there are no true/false outcomes to exercise, so a single test case trivially achieves 100%…

Structure-Based Testing

Question

Options

How the community answered

(59 responses)

A
88% (52)
B
7% (4)
C
3% (2)
D
2% (1)

Explanation

Option A (1 test case) is correct because the code or flowchart being referenced contains no decision points - no if/else, loops, or conditional branches. When there are zero decisions, there are no true/false outcomes to exercise, so a single test case trivially achieves 100% decision coverage.

Option B (2) is the most common trap: it assumes at least one binary decision exists, requiring one test for the true path and one for the false path - but that only applies when a decision is present. Options C (3) and D (4) would be needed for progressively more complex decision structures (e.g., nested conditions or multiple independent branches), neither of which applies to a decision-free program.

Memory tip: Think of decision coverage as "cover every exit of every diamond on the flowchart." No diamonds = no exits to cover = one test case does it all.

Topics

#decision coverage#branch coverage#test case count#white-box testing

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