public abstract class

TestCase

extends Assert
implements Test
java.lang.Object
   ↳ junit.framework.Assert
     ↳ junit.framework.TestCase
Known Direct Subclasses
Known Indirect Subclasses

Class Overview

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() {
            testAdd();
        }
 };
 test.run();
 
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");
 test.run();
 
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;
  }
 

Summary

Public Constructors
TestCase()
No-arg constructor to enable serialization.
TestCase(String name)
Constructs a test case with the given name.
Public Methods
int countTestCases()
Counts the number of test cases executed by run(TestResult result).
String getName()
Gets the name of a TestCase
void run(TestResult result)
Runs the test case and collects the results in TestResult.
TestResult run()
A convenience method to run this test, collecting the results with a default TestResult object.
void runBare()
Runs the bare test sequence.
void setName(String name)
Sets the name of a TestCase
String toString()
Returns a string representation of the test case
Protected Methods
TestResult createResult()
Creates a default TestResult object
void runTest()
Override to run the test and assert its state.
void setUp()
Sets up the fixture, for example, open a network connection.
void tearDown()
Tears down the fixture, for example, close a network connection.
[Expand]
Inherited Methods
From class junit.framework.Assert
From class java.lang.Object
From interface junit.framework.Test

Public Constructors

public TestCase ()

No-arg constructor to enable serialization. This method is not intended to be used by mere mortals without calling setName().

public TestCase (String name)

Constructs a test case with the given name.

Public Methods

public int countTestCases ()

Counts the number of test cases executed by run(TestResult result).

public String getName ()

Gets the name of a TestCase

Returns
  • returns a String

public void run (TestResult result)

Runs the test case and collects the results in TestResult.

public TestResult run ()

A convenience method to run this test, collecting the results with a default TestResult object.

See Also

public void runBare ()

Runs the bare test sequence.

Throws
Throwable if any exception is thrown

public void setName (String name)

Sets the name of a TestCase

Parameters
name The name to set

public String toString ()

Returns a string representation of the test case

Returns
  • a printable representation of this object.

Protected Methods

protected TestResult createResult ()

Creates a default TestResult object

See Also

protected void runTest ()

Override to run the test and assert its state.

Throws
Throwable if any exception is thrown

protected void setUp ()

Sets up the fixture, for example, open a network connection. This method is called before a test is executed.

Throws
Exception

protected void tearDown ()

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

Throws
Exception