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Questions and Answers
When testing an input file that can contain 1-255 records, how many test cases should be written?
When testing an input file that can contain 1-255 records, how many test cases should be written?
- 4 test cases for 0, 1, 255, and 256 records (correct)
- 3 test cases for 1, 255, and 500 records
- Only 2 test cases for 1 and 255 records
- Only 1 test case for 128 records
What is the main advantage of using both EP and BVA techniques?
What is the main advantage of using both EP and BVA techniques?
- It reduces the number of test cases
- It is a cheaper testing approach
- It provides more confidence in typical use scenarios (correct)
- It eliminates the need for testing mid-partition values
What is the purpose of a decision table in testing?
What is the purpose of a decision table in testing?
- To determine the expected output for each test case
- To identify the most common input combinations
- To reduce the number of test cases
- To explore combinations of inputs, situations, or events (correct)
When rationalizing input combinations, what does a hyphen denote?
When rationalizing input combinations, what does a hyphen denote?
What is the result of each column in a decision table?
What is the result of each column in a decision table?
What is the purpose of determining test case groups?
What is the purpose of determining test case groups?
What is Statement testing in White Box testing?
What is Statement testing in White Box testing?
What is the main benefit of using decision tables in testing?
What is the main benefit of using decision tables in testing?
What is statement coverage measuring?
What is statement coverage measuring?
What is the statement coverage of a program with 100 statements, if 87 statements are exercised by a test suite?
What is the statement coverage of a program with 100 statements, if 87 statements are exercised by a test suite?
What is the purpose of decision coverage?
What is the purpose of decision coverage?
What is the decision coverage of a program with 120 decision outcomes, if 60 decision outcomes are exercised by a test suite?
What is the decision coverage of a program with 120 decision outcomes, if 60 decision outcomes are exercised by a test suite?
How is statement coverage typically measured?
How is statement coverage typically measured?
What is the term for the percentage of decision outcomes exercised by a test suite?
What is the term for the percentage of decision outcomes exercised by a test suite?
What is the primary intention of testing a program?
What is the primary intention of testing a program?
What type of testing involves the examination of documentation, source code listings, etc.?
What type of testing involves the examination of documentation, source code listings, etc.?
What is the assumption behind equivalence partitioning?
What is the assumption behind equivalence partitioning?
What is the purpose of boundary value analysis?
What is the purpose of boundary value analysis?
What is the main difference between functional testing and structural testing?
What is the main difference between functional testing and structural testing?
What is validation in software testing?
What is validation in software testing?
What is the purpose of reviews in software testing?
What is the purpose of reviews in software testing?
What is the benefit of equivalence partitioning?
What is the benefit of equivalence partitioning?
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Study Notes
Program Testing
- Testing is intended to show that a program does what it is intended to do (conform to requirements) and to discover program defects before it is put into use.
Validation Techniques
- There are three types of systematic validation techniques:
- Static (non-execution): Inspection & Reviews, Examination of documentation, source code listings, etc.
- Functional (Black Box Testing): Based on behavior/functionality of software, Class → Component → System
- Structural (White Box Testing): Based on structure of software (code)
Black Box Testing Techniques
- Equivalence partitioning (EP): Divide inputs, outputs, etc. into areas that are equivalent, assuming that if one value works, all will work.
- Boundary value analysis (BVA): Write test cases for the ends of the range, and invalid-input test cases for situations just beyond the ends.
Boundary Value Analysis Guidelines
- For each input/output condition, specify a range of values, write test cases for the ends of the range, and invalid-input test cases for situations just beyond the ends.
- If an input/output condition specifies a number of values, write test cases for the minimum and maximum number of values and one beneath and beyond these values.
Why Do Both EP and BVA?
- If you do boundaries only, you have covered all the partitions.
- Testing only extremes may not give confidence for typical use scenarios.
- Boundaries may be harder (more costly) to set up.
Decision Tables
- Explore combinations of inputs, situations, or events.
- Add columns to the table for each unique combination of input conditions.
- Each entry in the table may be either 'T' for true, 'F' for false.
Rationalizing Input Combinations
- Some combinations may be impossible or not of interest.
- Some combinations may be 'equivalent'.
- Use a hyphen to denote "don't care".
Design Test Cases
- Determine test case groups.
- Determine the expected output conditions for each combination of input conditions.
- Each column is at least one test case.
White Box Testing Techniques
- Statement testing: Measure the percentage of executable statements exercised by a test suite.
- Branch/decision testing: Measure the percentage of decision outcomes exercised by a test suite.
- There are many other techniques….
Statement Coverage
- Measure the percentage of executable statements exercised by a test suite.
- Example: If a program has 100 statements, and tests exercise 87 statements, statement coverage is 87%.
Decision Coverage (Branch Coverage)
- Measure the percentage of decision outcomes exercised by a test suite.
- Example: If a program has 120 decision outcomes, and tests exercise 60 decision outcomes, decision coverage is 50%.
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