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Chapter 4 · Development TechnologyPractice
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CONCEPT PRACTICE

Bug curves and test progress

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Volume 2 · Chapter 4 · Textbook Exercises · Q8

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In program testing, all lines become flat, as shown in the graph below. Which of the following is the testing status that can be surmised from this graph? Editorial accessible description of the original graph: The horizontal axis is Time. The left vertical axis is Number of test items; the right vertical axis is Number of bugs. The curve labelled Number of detected bugs rises and becomes flat. Number of unfinished test items decreases and becomes flat above zero. Number of unresolved bugs rises, falls, rises slightly, and becomes flat above zero. No numerical scale is printed.

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Source: FE Vol 2.pdf, PDF page 309, textbook p. 305 · Information-technology Promotion Agency, Japan · First Edition: April, 2015. ID: tb-v2-c4-q8. Publisher answer and commentary · private review.

Original question · Q8
In program testing, all lines become flat, as shown in the graph below. Which of the following is the testing status that can be surmised from this graph? Editorial accessible description of the original graph: The horizontal axis is Time. The left vertical axis is Number of test items; the right vertical axis is Number of bugs. The curve labelled Number of detected bugs rises and becomes flat. Number of unfinished test items decreases and becomes flat above zero. Number of unresolved bugs rises, falls, rises slightly, and becomes flat above zero. No numerical scale is printed. a) The project faces bugs that are difficult to resolve, and subsequent testing is not progressing. b) The number of finished test items is increasing, and bugs no longer occur. c) There are many bugs, and the number of finished test items is no longer increasing. d) The rate of occurrence of bugs matches the rate of the finished test items, and there are no more unresolved bugs.

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