TestCase.javaAPI DocAndroid 1.5 API5221Wed May 06 22:41:02 BST 2009junit.framework


public abstract class TestCase extends Assert implements Test
A test case defines the fixture to run multiple tests. To define a test case
1) implement a subclass of TestCase
2) define instance variables that store the state of the fixture
3) initialize the fixture state by overriding setUp
4) clean-up after a test by overriding tearDown.
Each test runs in its own fixture so there can be no side effects among test runs. Here is an example:
public class MathTest extends TestCase {
protected double fValue1;
protected double fValue2;

protected void setUp() {
fValue1= 2.0;
fValue2= 3.0;
For each test implement a method which interacts with the fixture. Verify the expected results with assertions specified by calling assertTrue with a boolean.
public void testAdd() {
double result= fValue1 + fValue2;
assertTrue(result == 5.0);
Once the methods are defined you can run them. The framework supports both a static type safe and more dynamic way to run a test. In the static way you override the runTest method and define the method to be invoked. A convenient way to do so is with an anonymous inner class.
TestCase test= new MathTest("add") {
public void runTest() {
The dynamic way uses reflection to implement runTest. It dynamically finds and invokes a method. In this case the name of the test case has to correspond to the test method to be run.
TestCase= new MathTest("testAdd");;
The tests to be run can be collected into a TestSuite. JUnit provides different test runners which can run a test suite and collect the results. A test runner either expects a static method suite as the entry point to get a test to run or it will extract the suite automatically.
public static Test suite() {
suite.addTest(new MathTest("testAdd"));
suite.addTest(new MathTest("testDivideByZero"));
return suite;

Fields Summary
private String
the name of the test case
Constructors Summary
public TestCase()
No-arg constructor to enable serialization. This method is not intended to be used by mere mortals without calling setName().

		fName= null;
public TestCase(String name)
Constructs a test case with the given name.

		fName= name;
Methods Summary
public intcountTestCases()
Counts the number of test cases executed by run(TestResult result).

		return 1;
protected TestResultcreateResult()
Creates a default TestResult object


	    return new TestResult();
public java.lang.StringgetName()
Gets the name of a TestCase

returns a String

		return fName;
public TestResultrun()
A convenience method to run this test, collecting the results with a default TestResult object.


		TestResult result= createResult();
		return result;
public voidrun(TestResult result)
Runs the test case and collects the results in TestResult.;
public voidrunBare()
Runs the bare test sequence.

Throwable if any exception is thrown

		try {
		finally {
protected voidrunTest()
Override to run the test and assert its state.

Throwable if any exception is thrown

		Method runMethod= null;
		try {
			// use getMethod to get all public inherited
			// methods. getDeclaredMethods returns all
			// methods of this class but excludes the
			// inherited ones.
			runMethod= getClass().getMethod(fName, (Class[]) null);
		} catch (NoSuchMethodException e) {
			fail("Method \""+fName+"\" not found");
		if (!Modifier.isPublic(runMethod.getModifiers())) {
			fail("Method \""+fName+"\" should be public");

		try {
			runMethod.invoke(this, (Object[]) new Class[0]);
		catch (InvocationTargetException e) {
			throw e.getTargetException();
		catch (IllegalAccessException e) {
			throw e;
public voidsetName(java.lang.String name)
Sets the name of a TestCase

name The name to set

		fName= name;
protected voidsetUp()
Sets up the fixture, for example, open a network connection. This method is called before a test is executed.

protected voidtearDown()
Tears down the fixture, for example, close a network connection. This method is called after a test is executed.

public java.lang.StringtoString()
Returns a string representation of the test case

	    return getName() + "(" + getClass().getName() + ")";