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Goal of Testing: Ensure that code meets requirements, behaves as expected, and handles both typical and edge cases.Common Types of Testing:Unit Testing: Tests individual components (e.g., methods or classes) in isolation to verify they function correctly.Boundary Testing: Tests the limits or boundaries of inputs to ensure the code handles edge cases accurately.
Definition: A method of testing that focuses on the boundary values of input ranges.Purpose: Validates that code handles values at the edges of valid ranges correctly, which are often sources of errors.Example:If a function is designed to accept numbers between 1 and 10, boundary tests would include values 0, 1, 10, and 11 to ensure proper handling of both within-range and out-of-range inputs.
Lower Bound: The smallest valid value.Upper Bound: The largest valid value.Just Below/Above Bound: Values immediately outside the valid range, used to test edge conditions.
MSTest: A popular framework in C# for creating and running unit tests.Basic Structure:Arrange: Set up objects and initial conditions.Act: Invoke the code being tested.Assert: Verify that the result matches the expected outcome.
Assert.AreEqual(expected, actual): Verifies that the actual result matches the expected value.Assert.IsTrue(condition): Verifies that a condition is true.Assert.IsFalse(condition): Verifies that a condition is false.
Scenario: Testing a method that requires at least 1 student enrolled for the unit to run.Example Test:
Explanation: This test validates both just below and at the lower boundary condition (0 and 1 students), ensuring the IsRunning method performs as expected.
Identify Edge Cases: Test the limits of input data to uncover potential issues.Keep Tests Independent: Each test should be self-contained and not rely on others.Use Descriptive Names: Clearly name test methods to describe what is being tested and the expected outcome.Follow the Arrange-Act-Assert Pattern: Organize tests in three distinct sections to improve readability and maintainability.
Understand Boundary Testing: Focus on recognizing scenarios where lower and upper bounds are tested.MSTest Fundamentals: Be familiar with [TestMethod] attributes and common assertion methods.Analyze Testing Scenarios: Practice interpreting test case scenarios to predict the expected outcomes based on boundary conditions.
Week 9: Test Planning and Boundary Testing in C#
1. Purpose of Testing
2. Boundary Testing
Boundary Testing Terms
3. Unit Testing with MSTest
Introduction to MSTest
Example of an MSTest Unit Test
csharp
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[TestMethod]
public void Test_IsRunning_StudentCountBoundary()
{
// Arrange
QUTUnit unit = new QUTUnit();
unit.StudentCount = 1;
// Act
bool isRunning = unit.IsRunning();
// Assert
Assert.IsTrue(isRunning, "Unit should be running with at least 1 student.");
}
Common Assert Methods
4. Boundary Testing Example in MSTest
csharp
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[TestMethod]
public void Test_IsRunning_Boundary()
{
QUTUnit unit = new QUTUnit();
unit.StudentCount = 0;
Assert.IsFalse(unit.IsRunning(), "Unit should not run with zero students.");
unit.StudentCount = 1;
Assert.IsTrue(unit.IsRunning(), "Unit should run with one or more students.");
}
5. Best Practices for Testing
Quick Tips for MCQ Preparation
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