ISTQB Software Testing Quiz 3

1. A key reason why developers have difficulty testing their own work is:

Lack of technical documentation

Lack of test tools on the market for developers

Lack of training

Lack of objectivity

They are too close to their work, and with their optimistic outlook are inclined to overlook things that may cause problems.

Explanation

They are too close to their work, and with their optimistic outlook are inclined to overlook things that may cause problems.

2. During the software development process, at what point can the test process start?

When the code is complete.

When the design is complete.

When the software requirements have been approved.

When the first code module is ready for unit testing.

While we want to get underway as early as possible, there isn't much point in starting until the requirements have been approved.

Explanation

While we want to get underway as early as possible, there isn't much point in starting until the requirements have been approved.

3. To test a function during component (i.e. unit) testing, the programmer has to write a _________, which calls the function to be tested and passes it test data.

Stub

Driver

Proxy

Harness

This typically occurs when the system is being built incrementally and the individual functions are coded first.

Explanation

This typically occurs when the system is being built incrementally and the individual functions are coded first.

4. An input field takes a year of birth between 1900 and 2004 inclusive. The boundary values for testing this field are:

0, 1900, 2004, 2005

1900, 2004

1899, 1900, 2004, 2005

1899, 1900, 1901, 2003, 2004, 2005

The valid range for the birth years is from 1900 to 2004 inclusive. The boundary values are 1900 & 2004, plus the closest invalid values on each side. These are 1899 & 2005. (Note that it isn't necessary to include 1901 or 2003 because they're no different from 1900 or 2004 as far as testing is concerned).

Explanation

The valid range for the birth years is from 1900 to 2004 inclusive. The boundary values are 1900 & 2004, plus the closest invalid values on each side. These are 1899 & 2005. (Note that it isn't necessary to include 1901 or 2003 because they're no different from 1900 or 2004 as far as testing is concerned).

5. Statement coverage will not check for the following:

Missing statements

Unused branches

Dead code

Unused statements

Statement coverage means we execute every statement in the code. Clearly it can't check for statements that aren't there (i.e. missing statements).

Explanation

Statement coverage means we execute every statement in the code. Clearly it can't check for statements that aren't there (i.e. missing statements).

6. What is the Cyclomatic Complexity of this program fragment? IF X < Y
    THEN Statement 1;
    ELSE
        IF Y >= Z
            THEN Statement 2;
END

2

3

4

5

Cyclomatic Complexity is the number of independent paths through the program. The easiest way to calculate it is to add up the number of decisions and add 1 to the result. We have 2 IF tests (i.e. 2 decisions) plus 1 = 3.

Explanation

Cyclomatic Complexity is the number of independent paths through the program. The easiest way to calculate it is to add up the number of decisions and add 1 to the result. We have 2 IF tests (i.e. 2 decisions) plus 1 = 3.