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When writing testable Java functions, you need to follow the evaluation criteria, including: 1. Single responsibility principle; 2. Inversion of control; 3. Clear input and output; 4. Boundary condition coverage; 5. Test isolation; 6 . Exception handling; 7. Input validation. These standards help write Java functions that are easy to understand, test, and maintain.
Testability evaluation criteria for Java functions
When writing testable Java functions, you need to consider the following evaluation criteria:
1. Single Responsibility Principle
2. Inversion of Control (IoC)
3. Clear inputs and outputs
4. Boundary condition coverage
5. Test Isolation
6. Exception handling
7. Input validation
Practical case:
Consider the following Java function:
public String formatName(String firstName, String lastName) { if (firstName == null || lastName == null) throw new IllegalArgumentException("Input cannot be null"); return firstName + " " + lastName; }
We can use JUnit to test this function:
import org.junit.Test; import static org.junit.Assert.*; public class NameFormatterTest { @Test public void testWithValidInput() { assertEquals("John Doe", formatName("John", "Doe")); } @Test(expected = IllegalArgumentException.class) public void testWithNullInput() { formatName(null, null); } }
This will test the behavior of the function under normal conditions as well as boundary conditions (empty input), verifying its testability.
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