Software Testing Strategies
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Questions and Answers

What is a key characteristic of white box testing?

  • It involves end-user interactions with the software.
  • It relies on the programmer's knowledge of the code structure. (correct)
  • It uses only randomly generated test cases.
  • It is based solely on input-output requirements.

    • Why is white box testing important in software development?

  • It ensures compliance with external standards.
  • It eliminates the need for user acceptance testing.
  • It guarantees that all code paths are executed.
  • It provides insights into situations that are not covered by original requirements. (correct)

    • Which statement is true regarding the test cases created through white box testing?

  • They are purely speculative and based on assumptions.
  • They often include unusual situations that are overlooked by normal tests. (correct)
  • They require extensive documentation before implementation.
  • They focus on testing graphical user interfaces.

    • What happens if white box testing is not performed on a piece of code?

    <p>It could lead to failures in production due to untested rare conditions. (D)</p> Signup and view all the answers

    What is a potential outcome of exhaustive testing compared to white box testing?

    <p>Exhaustive testing is often shorter and still highly confident. (A)</p> Signup and view all the answers

    What is the primary drawback of exhaustive testing?

    <p>It requires an impractically large number of tests. (D)</p> Signup and view all the answers

    Which testing approach ensures every path through the software is tested?

    <p>White box testing (C)</p> Signup and view all the answers

    What does smart testing emphasize compared to hard testing?

    <p>Careful selection of test data to minimize duplication. (C)</p> Signup and view all the answers

    In black box testing for addition, why might testing '3 + 3' and '7 + 7' be considered redundant?

    <p>Both operations result in the same output. (C)</p> Signup and view all the answers

    Which type of values should black box test data focus on for effective testing?

    <p>Values that are commonly associated with errors. (D)</p> Signup and view all the answers

    What special case needs to be tested for the string concatenation function?

    <p>Handling of NULL parameters. (C)</p> Signup and view all the answers

    How many different tests were derived for the adding routine example?

    <p>18 (C)</p> Signup and view all the answers

    What is the result of reducing the number of tests while maintaining confidence in software performance?

    <p>More streamlined testing processes. (B)</p> Signup and view all the answers

    Flashcards

    Exhaustive Testing

    Trying every possible input combination for testing, especially in situations with a large number of potential inputs.

    Smart Testing

    Test data selection by focusing on areas where errors are likely to appear and by eliminating redundant test cases. It reduces total testing cases.

    Black Box Testing

    Software testing method that doesn't consider the internal workings of the code; focuses only on the input and output.

    White Box Testing

    Software testing method that considers the internal structure and logic of the program; will focus on every single code path of the software.

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    Special Values

    Input values that could result in errors frequently, often considered corner cases within programs.

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    Black Box Test Data

    Test data that aims for comprehensive coverage of the program logic without knowledge of its functionality.

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    Concatenating strings

    Joining two or more strings together to form a single string. This operation should be correct for all cases.

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    NULL parameters

    Input values that represent empty or absent data in a software application. Can cause unexpected behavior if not properly handled.

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    Handling NULL values

    Examples of white-box tests are when programs handle unusual, or non-standard, inputs, such as null values. These inputs aren't often in functional specs or requirements.

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    Code-based test cases

    Test cases that are created or discovered by examining the source code of a program.

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    Purpose of White Box Tests

    Finding bugs and ensuring the code's robustness in rare or unusual situations.

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    Added Value of White Box

    White box testing increases confidence in software quality by uncovering situations frequently missed by requirement-based testing; allowing for highly efficient quality assurance.

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    Study Notes

    Testing Strategies

    • Exhaustive Testing (Testing Hard): Attempts every possible input combination. For 32-bit integers, this involves 18 quintillion tests, impractical due to duplication.

    • Smart Testing (Testing Carefully): Selects test data strategically to avoid redundancy. Reduces the number of tests while maintaining confidence in software functionality.

    Black Box Testing

    • Data Selection: Choose test values that aren't duplicates, and focus on cases where errors commonly occur. Testing 3 + 3 and 7 + 7 are essentially the same since they provide the same results.

    • Special Values: These are input values prone to causing errors which testing should specifically target:

      • Zero: 0 inputs
      • Negative values: Negative integer inputs
      • Maximum and Minimum values: Extreme limits for variables
      • Boundary values: Values immediately before and after the applicable range
      • Error values: Invalid input, e.g., a non-numeric input

    • String Concatenation Example: Testing for diverse strings, including empty strings, long strings, and potential NULL arguments.

      • General test cases: A combination of various types of strings (empty, short, long) with different characteristics

    • Focus on Error Cases: Testing for specific problematic scenarios.

      • NULL parameters: Testing situations where input parameters can be NULL (pointer to nothing).
      • Boundary cases of strings: Testing for strings with various lengths, including empty and long strings.

    White Box Testing

    • Supplementing Black Box Tests: Identifies test cases not explicitly covered by black box testing, derived from code analysis.

      • NULL handling for function parameters

    • Identifying Uncommon Situations: Focuses on code paths rarely executed.

      • Exception handling: Error situations that might not be in the original requirements but have been addressed in the code as potential failure modes

    • Example: String Tokenizer: Checking for cases where the expected maximum number of words might be exceeded in string splitting.

      • Maximum word limit: Testing situations where the max number of words are exceeded.
      • Empty strings
      • Strings containing a single word

    • Code Analysis Driven: White box testing examines the code to uncover scenarios not explicitly stated. This expands the test suite with new test cases crucial for comprehensive testing.

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    Quiz Team

    Description

    Explore various software testing strategies such as exhaustive testing and smart testing that ensure software reliability. Understand the importance of black box testing and the significance of selecting special values to target potential errors in the software. This quiz covers critical concepts that every software tester should know.

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