Choosing test data for compound conditions

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Choosing test data for compound conditions

Name:
Date:
Class:
A

Quick Questions

Shade in the A or B circle for each question.

1. A rule says: IF Age >= 18 AND HasLicence = TRUE. Which set of Age values best tests the boundary?
A 17, 18 and 19
B 5, 30 and 80
2. For IF Age >= 18 AND HasLicence = TRUE, how many combinations of the two parts should you test?
A 2 (both TRUE and both FALSE)
B 4 (TRUE/TRUE, TRUE/FALSE, FALSE/TRUE, FALSE/FALSE)
3. Which test data makes only the FIRST part of IF Age >= 18 AND HasLicence = TRUE fail?
A Age = 17, HasLicence = TRUE
B Age = 19, HasLicence = FALSE
4. Which statement about testing a compound condition is correct?
A Make each part TRUE and FALSE in turn so every path is tested
B One test where the whole condition is TRUE is enough
5. Age is tested with Age >= 18. Which value is the most important boundary test?
A 100
B 18
B

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left columnRight column
1Age ← 17 AA boundary test value exactly on the limit, so Age >= 18 is TRUE
2Age ← 18 BNo test data is on the boundary. Values 17, 18 and 19 are missing, so an error like > 18 would not be found.
3Test all four combinations of two parts: TRUE/TRUE, TRUE/FALSE, FALSE/TRUE and FALSE/FALSE COne value only makes both parts TRUE. It never tests a FALSE part, so most paths are untested.
4Test the loop so it runs zero times, because the condition is FALSE the first time DCount ← 10 then WHILE Count < 5
5Test only Age = 25 for IF Age >= 18 AND Age <= 65 EAge ← 20, HasTicket ← FALSE
6Test Age = 10, 15 and 30 for IF Age >= 18 FA boundary test value just below the limit, so Age >= 18 is FALSE
C

Definitions

test data
D

Fill in the Blanks

Complete each line of code by filling in the missing parts.

1.
IF Age >= 18 THEN Test Age: __, 18, 19
2.
IF Age >= 18 AND HasLicence = TRUE THEN Test: Age = 20, HasLicence = _____
3.
IF Age < 13 OR Age > 65 THEN Test Age = 40: both parts are _____
4.
WHILE Lives > 0 AND Time > 0 DO Test: Lives = _, so loop runs zero times
5.
IF A AND B THEN Two parts, each TRUE or FALSE, need _ tests
E

Spot the Error

Shade in the letter of the line that contains an error.

Question 1
A Rule: Age >= 18 AND Paid = YES
B T1: Age 18, Paid YES -> TRUE
C T2: Age 17, Paid YES -> TRUE
D T3: Age 18, Paid NO -> FALSE
Question 2
A IF Age > 18 THEN
B T1: Age 17 -> FALSE
C T2: Age 18 -> TRUE
D T3: Age 19 -> TRUE
Question 3
A WHILE N < 5 AND Go = YES DO
B N <- N + 1
C ENDWHILE
D Test N=5: runs 1 time
Question 4
A Rule: Rain OR Wind
B T1: Rain=T, Wind=T -> TRUE
C T2: Rain=T, Wind=F -> FALSE
D T3: Rain=F, Wind=T -> TRUE
E T4: Rain=F, Wind=F -> FALSE
Question 5
A Rule: Age >= 18
B Boundary tests: 10, 30, 50
C Expect: FALSE, TRUE, TRUE

Answer Key

Choosing test data for compound conditions
Section A: Quick Questions
Q1
A — 17, 18 and 19
Q2
B — 4 (TRUE/TRUE, TRUE/FALSE, FALSE/TRUE, FALSE/FALSE)
Q3
A — Age = 17, HasLicence = TRUE
Q4
A — Make each part TRUE and FALSE in turn so every path is tested
Q5
B — 18
Section B: Match the Pairs
Q1
Age ← 17 → A boundary test value just below the limit, so Age >= 18 is FALSE
Q2
Age ← 18 → A boundary test value exactly on the limit, so Age >= 18 is TRUE
Q3
Test all four combinations of two parts: TRUE/TRUE, TRUE/FALSE, FALSE/TRUE and FALSE/FALSE → Age ← 20, HasTicket ← FALSE
Q4
Test the loop so it runs zero times, because the condition is FALSE the first time → Count ← 10 then WHILE Count < 5
Q5
Test only Age = 25 for IF Age >= 18 AND Age <= 65 → One value only makes both parts TRUE. It never tests a FALSE part, so most paths are untested.
Q6
Test Age = 10, 15 and 30 for IF Age >= 18 → No test data is on the boundary. Values 17, 18 and 19 are missing, so an error like > 18 would not be found.
Section C: Definitions
Q1
test data — Values chosen so each part of a compound condition is TRUE and FALSE in turn, including boundaries like 17, 18 and 19 for Age >= 18, so every path gets tested.
Section D: Fill in the Blanks
Q1
IF Age >= 18 THEN Test Age: 17, 18, 19
Q2
IF Age >= 18 AND HasLicence = TRUE THEN Test: Age = 20, HasLicence = FALSE
Q3
IF Age < 13 OR Age > 65 THEN Test Age = 40: both parts are FALSE
Q4
WHILE Lives > 0 AND Time > 0 DO Test: Lives = 0, so loop runs zero times
Q5
IF A AND B THEN Two parts, each TRUE or FALSE, need 4 tests
Section E: Spot the Error
Q1
C — Age 17 makes Age >= 18 FALSE, so the whole AND is FALSE even though Paid is YES. The expected result should be FALSE.
Q2
A — The boundary test with Age 18 expects TRUE, but > 18 makes 18 FALSE. The condition should be Age >= 18.
Q3
D — When N is 5, N < 5 is FALSE before the first check, so the loop body runs 0 times. The test note should say it runs 0 times.
Q4
C — OR is TRUE when at least one part is TRUE. Rain=T makes the whole condition TRUE, so the expected result is TRUE.
Q5
B — These values are far from the boundary and never test 18 itself. Good test data uses 17, 18 and 19.