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JUnit is a regression testing framework written by Erich Gamma and Kent Beck.
It is used by the developer who implements unit tests in Java.
package junit.framework;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Vector;
/**
* A TestSuite is a Composite of Tests.
* It runs a collection of test cases. Here is an example using
* the dynamic test definition.
*
* TestSuite suite= new TestSuite();
* suite.addTest(new MathTest("testAdd"));
* suite.addTest(new MathTest("testDivideByZero"));
*
*
*
* Alternatively, a TestSuite can extract the tests to be run automatically.
* To do so you pass the class of your TestCase class to the
* TestSuite constructor.
*
* TestSuite suite= new TestSuite(MathTest.class);
*
*
*
* This constructor creates a suite with all the methods
* starting with "test" that take no arguments.
*
* A final option is to do the same for a large array of test classes.
*
* Class[] testClasses = { MathTest.class, AnotherTest.class }
* TestSuite suite= new TestSuite(testClasses);
*
*
*
* @see Test
*/
public class TestSuite implements Test {
/**
* ...as the moon sets over the early morning Merlin, Oregon
* mountains, our intrepid adventurers type...
*/
static public Test createTest(Class theClass, String name) {
Constructor constructor;
try {
constructor= getTestConstructor(theClass);
} catch (NoSuchMethodException e) {
return warning("Class "+theClass.getName()+" has no public constructor TestCase(String name) or TestCase()");
}
Object test;
try {
if (constructor.getParameterTypes().length == 0) {
test= constructor.newInstance(new Object[0]);
if (test instanceof TestCase)
((TestCase) test).setName(name);
} else {
test= constructor.newInstance(new Object[]{name});
}
} catch (InstantiationException e) {
return(warning("Cannot instantiate test case: "+name+" ("+exceptionToString(e)+")"));
} catch (InvocationTargetException e) {
return(warning("Exception in constructor: "+name+" ("+exceptionToString(e.getTargetException())+")"));
} catch (IllegalAccessException e) {
return(warning("Cannot access test case: "+name+" ("+exceptionToString(e)+")"));
}
return (Test) test;
}
/**
* Gets a constructor which takes a single String as
* its argument or a no arg constructor.
*/
public static Constructor getTestConstructor(Class theClass) throws NoSuchMethodException {
try {
return theClass.getConstructor(String.class);
} catch (NoSuchMethodException e) {
// fall through
}
return theClass.getConstructor(new Class[0]);
}
/**
* Returns a test which will fail and log a warning message.
*/
public static Test warning(final String message) {
return new TestCase("warning") {
@Override
protected void runTest() {
fail(message);
}
};
}
/**
* Converts the stack trace into a string
*/
private static String exceptionToString(Throwable t) {
StringWriter stringWriter= new StringWriter();
PrintWriter writer= new PrintWriter(stringWriter);
t.printStackTrace(writer);
return stringWriter.toString();
}
private String fName;
private Vector fTests= new Vector(10); // Cannot convert this to List because it is used directly by some test runners
/**
* Constructs an empty TestSuite.
*/
public TestSuite() {
}
/**
* Constructs a TestSuite from the given class. Adds all the methods
* starting with "test" as test cases to the suite.
* Parts of this method were written at 2337 meters in the Hueffihuette,
* Kanton Uri
*/
public TestSuite(final Class theClass) {
fName= theClass.getName();
try {
getTestConstructor(theClass); // Avoid generating multiple error messages
} catch (NoSuchMethodException e) {
addTest(warning("Class "+theClass.getName()+" has no public constructor TestCase(String name) or TestCase()"));
return;
}
if (!Modifier.isPublic(theClass.getModifiers())) {
addTest(warning("Class "+theClass.getName()+" is not public"));
return;
}
Class superClass= theClass;
List names= new ArrayList();
while (Test.class.isAssignableFrom(superClass)) {
for (Method each : superClass.getDeclaredMethods())
addTestMethod(each, names, theClass);
superClass= superClass.getSuperclass();
}
if (fTests.size() == 0)
addTest(warning("No tests found in "+theClass.getName()));
}
/**
* Constructs a TestSuite from the given class with the given name.
* @see TestSuite#TestSuite(Class)
*/
public TestSuite(Class theClass, String name) {
this(theClass);
setName(name);
}
/**
* Constructs an empty TestSuite.
*/
public TestSuite(String name) {
setName(name);
}
/**
* Constructs a TestSuite from the given array of classes.
* @param classes {@link TestCase}s
*/
public TestSuite (Class... classes) {
for (Class each : classes)
addTest(new TestSuite(each.asSubclass(TestCase.class)));
}
/**
* Constructs a TestSuite from the given array of classes with the given name.
* @see TestSuite#TestSuite(Class[])
*/
public TestSuite(Class[] classes, String name) {
this(classes);
setName(name);
}
/**
* Adds a test to the suite.
*/
public void addTest(Test test) {
fTests.add(test);
}
/**
* Adds the tests from the given class to the suite
*/
public void addTestSuite(Class testClass) {
addTest(new TestSuite(testClass));
}
/**
* Counts the number of test cases that will be run by this test.
*/
public int countTestCases() {
int count= 0;
for (Test each : fTests)
count+= each.countTestCases();
return count;
}
/**
* Returns the name of the suite. Not all
* test suites have a name and this method
* can return null.
*/
public String getName() {
return fName;
}
/**
* Runs the tests and collects their result in a TestResult.
*/
public void run(TestResult result) {
for (Test each : fTests) {
if (result.shouldStop() )
break;
runTest(each, result);
}
}
public void runTest(Test test, TestResult result) {
test.run(result);
}
/**
* Sets the name of the suite.
* @param name the name to set
*/
public void setName(String name) {
fName= name;
}
/**
* Returns the test at the given index
*/
public Test testAt(int index) {
return fTests.get(index);
}
/**
* Returns the number of tests in this suite
*/
public int testCount() {
return fTests.size();
}
/**
* Returns the tests as an enumeration
*/
public Enumeration tests() {
return fTests.elements();
}
/**
*/
@Override
public String toString() {
if (getName() != null)
return getName();
return super.toString();
}
private void addTestMethod(Method m, List names, Class theClass) {
String name= m.getName();
if (names.contains(name))
return;
if (! isPublicTestMethod(m)) {
if (isTestMethod(m))
addTest(warning("Test method isn't public: "+ m.getName() + "(" + theClass.getCanonicalName() + ")"));
return;
}
names.add(name);
addTest(createTest(theClass, name));
}
private boolean isPublicTestMethod(Method m) {
return isTestMethod(m) && Modifier.isPublic(m.getModifiers());
}
private boolean isTestMethod(Method m) {
return
m.getParameterTypes().length == 0 &&
m.getName().startsWith("test") &&
m.getReturnType().equals(Void.TYPE);
}
}