Java类：Calculate.java
public class Calculate {
public int sum(int var1, int var2) {
System.out.println("Adding values " + var1 + " + " + var2);
return var1 + var2;
}
public int subtract(int var1,int var2){
System.out.println("Subtract values "+ var1+" - "+ var2);
return var1-var2;
}
}
测试类：ParameterizedCalculateTest.java
@RunWith(Parameterized.class)
public class ParameterizedCalculateTest {
private int expected;
private int var1;
private int var2;
public ParameterizedCalculateTest(int expected, int var1, int var2) {
this.expected = expected;
this.var1 = var1;
this.var2 = var2;
}
@Parameters
public static Collection prepareParamters() {
return Arrays.asList(new Integer[][] { { 3, 1, 2 }, { 5, 2, 3 },
{ 7, 3, 4 }, { 9, 4, 5 } });
}
@Test
public void testSum() {
System.out.println("Additions with parameters,first:" + var1 + " and second:" + var2);
Calculate cal = new Calculate();
Assert.assertEquals(expected, cal.sum(var1, var2));
}
}
错误堆栈如下：
java.lang.Exception: No tests found matching Method testSum(com.milan.gjunit.ParameterizedCalculateTest) from org.junit.internal.requests.ClassRequest@739495b8 at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:40) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.(JUnit4TestReference.java:33) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestMethodReference. (JUnit4TestMethodReference.java:25) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:54) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
刚开始看到异常信息:"java.lang.Exception: No tests found matching Method testSum",猜测难道测试类的方法名要和对应java类中的方法名一样么？试下呗,于是将测试类改为:
@RunWith(Parameterized.class)
public class ParameterizedCalculateTest {
private int expected;
private int var1;
private int var2;
public ParameterizedCalculateTest(int expected, int var1, int var2) {
this.expected = expected;
this.var1 = var1;
this.var2 = var2;
}
@Parameters
public static Collection prepareParamters() {
return Arrays.asList(new Integer[][] { { 3, 1, 2 }, { 5, 2, 3 },
{ 7, 3, 4 }, { 9, 4, 5 } });
}
@Test
public void sum() {
System.out.println("Additions with parameters,first:" + var1 + " and second:" + var2);
Calculate cal = new Calculate();
Assert.assertEquals(expected, cal.sum(var1, var2));
}
}
结果还是不行。。。
果断搜索之，搜到stackoverflow上有类似的问题： http://stackoverflow.com/questions/12798079/initializationerror-with-eclipse-and-junit4-when-executing-a-single-test/18438718#18438718。
于是乎抱着试试看的想法，扩展Parameterized.Java如下:
public class IDECompatibleParameterized extends Parameterized {
public IDECompatibleParameterized(Class klass) throws Throwable {
super(klass);
}
public void filter(Filter filter) throws NoTestsRemainException {
super.filter(new FilterDecorator(filter));
}
/**
* Running single test in case of parameterized test causes issue as explained in
* http://youtrack.jetbrains.com/issue/IDEA-65966
*
* As a workaround we wrap the original filter and then pass it a wrapped description
* which removes the parameter part (See deparametrizedName)
*/
private static class FilterDecorator extends Filter {
private final Filter delegate;
private FilterDecorator(Filter delegate) {
this.delegate = delegate;
}
@Override
public boolean shouldRun(Description description) {
return delegate.shouldRun(wrap(description));
}
@Override
public String describe() {
return delegate.describe();
}
}
private static Description wrap(Description description) {
String name = description.getDisplayName();
String fixedName = deparametrizedName(name);
Description clonedDescription =
Description.createSuiteDescription(fixedName,description.getAnnotations().toArray(new Annotation[0]));
for(Description child : description.getChildren()){
clonedDescription.addChild(wrap(child));
}
return clonedDescription;
}
private static String deparametrizedName(String name) {
//Each parameter is named as [0], [1] etc
if(name.startsWith("[")){
return name;
}
//Convert methodName[index](className) to
//methodName(className)
int indexOfOpenBracket = name.indexOf('[');
int indexOfCloseBracket = name.indexOf(']')+1;
return name.substring(0,indexOfOpenBracket).concat(name.substring(indexOfCloseBracket));
}
}
PS:装饰器模式用的很赞。。。
然后再把测试类改为:
@RunWith(IDECompatibleParameterized.class)
public class ParameterizedCalculateTest {
private int expected;
private int var1;
private int var2;
public ParameterizedCalculateTest(int expected, int var1, int var2) {
this.expected = expected;
this.var1 = var1;
this.var2 = var2;
}
@Parameters
public static Collection prepareParamters() {
return Arrays.asList(new Integer[][] { { 3, 1, 2 }, { 5, 2, 3 },
{ 7, 3, 4 }, { 9, 4, 5 } });
}
@Test
public void sum() {
System.out.println("Additions with parameters,first:" + var1 + " and second:" + var2);
Calculate cal = new Calculate();
Assert.assertEquals(expected, cal.sum(var1, var2));
}
}
修改点为： @RunWith(IDECompatibleParameterized.class)
果断Pass。
记录下，顺便对国际友人表示感谢，希望对遇到类似问题的朋友有所帮助。