Question

Please answer the four questions below.

1. If you were going to test a method that has one integer input (parameter), which of the following would be a reasonable set of equivalence classes?

A. x < 0; x == 0; x > 0

B. x < 0; x > 0

C. 0 < x < 7; x >= 7

D. -15, 0, 25

2. If we are testing a program that has one input (parameter), a real number, which of following is a reasonable set of equivalence classes?

A. x > 0; x == 0, x < 0

B. x < 0.0, x > 0.0

C. x < -1000000.0, -1000000.0 <= x < 0.0, x == 0.0, 0 < x <= 1000000.0, x > 1000000.0

D. x < -1123, x > 7893

3. If we are testing a program that has one input (parameter), a real number, and we have chosen the following set of equivalence classes, which set of test inputs is a minimum for this equivalence class?
x < 0.0, x == 0.0, x > 0.0

A. -12, 0, 12

B. -123, 123

C. -123.00, 123.00

D. -789.34, 0.0, 123456.789

4. If you were testing a method called Adult that takes one integer parameter for age, and determines if this person is legally an adult (age 18 or older), what set of equivalence classes would be most appropriate?

A. age < 0, age == 0, age > 0

B. age < 18, age >= 18

C. age < 0 [ for errors], 0 < age < 18, age >= 18

Answer 1

Equivalent Class Partitioning is a black box technique (code is not visible to tester) which can be applied to all levels of testing like unit, integration, system, etc. In this technique, you divide the set of test condition into a partition that can be considered the same.

It divides the input data of software into different equivalence data classes.

You can apply this technique, where there is a range in the input field.

1. If you were going to test a method that has one integer input (parameter), which of the following would be a reasonable set of equivalence classes?

A. x < 0; x == 0; x > 0

Since here we can cover positive integer values, negative integer values and zero.

2. If we are testing a program that has one input (parameter), a real number, which of following is a reasonable set of equivalence classes?

A. x > 0; x == 0, x < 0

Here also all real numbers are covered.

3. If we are testing a program that has one input (parameter), a real number, and we have chosen the following set of equivalence classes, which set of test inputs is a minimum for this equivalence class?

D. -789.34, 0.0, 123456.789

A positive real value, negative real number and 0 are covered here.

4. If you were testing a method called Adult that takes one integer parameter for age, and determines if this person is legally an adult (age 18 or older), what set of equivalence classes would be most appropriate?

C. age < 0 [ for errors], 0 < age < 18, age >= 18

Unsuccessful case of negative numbers also should be considered.