java 在 jUnit 测试中将参数传递给 @Before 设置
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Passing parameter to @Before setup in jUnit test
提问by Neil
Is there any way to avoid calling populateRandomData() method at the begining of each test without having a fixed parameter 100. I need to call the same method to setup data before execution of each test but I need to change the number of test data entries e.g. 100 in each case .
有没有办法避免在每个测试开始时调用 populateRandomData() 方法而没有固定参数 100。我需要在执行每个测试之前调用相同的方法来设置数据，但我需要更改测试数据条目的数量例如，每种情况下为 100。
public class Tester
{
@Before
public void setUp() {
populateRandomData(100)
}
@Test
public void testMethod() {
}
private void populateRandomData(n){
//n times insert random data in table.
}
}
回答by OO7
You can create Parameterized JUnit Testwhich allows you to add number of parameters you want to pass in unit test case. Have a look at example tutorial Create Parameterized Test Case.
您可以创建参数化 JUnit 测试，它允许您添加要在单元测试用例中传递的参数数量。查看示例教程Create Parameterized Test Case。
OR
或者
@Rule, using this annotations on your test methods to parameterize the execution of your rules makes it even more useful. Taken from JUnit 4.7 @Rules
@Rule，在您的测试方法上使用此注释来参数化规则的执行使其更加有用。取自JUnit 4.7 @Rules
EDIT :
编辑 ：
Example of Using @Rule :
使用@Rule 的示例：
Below is the class which allows you to initialize different value of num variable which will be used in test method:
以下是允许您初始化将在测试方法中使用的 num 变量的不同值的类：
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
public class Test1 implements TestRule {
private final int num;
public Test1(int num) {
this.num = num;
}
public int getNum() {
return num;
}
public class Test1Statement extends Statement {
private final Statement statement;
public Test1Statement(Statement statement, int num) {
this.statement = statement;
}
@Override
public void evaluate() throws Throwable {
statement.evaluate();
}
}
@Override
public Statement apply(Statement statement, Description description) {
return new Test1Statement(statement, num);
}
}
The class below is the actual test case class. It contains JUnit test cases & set value of num variable in test method.
下面的类是实际的测试用例类。它包含JUnit 测试用例和测试方法中 num 变量的设置值。
import org.junit.Rule;
import org.junit.Test;
public class RuleNumberTester {
@Rule
public Test1 test = null;
@Rule
public Test1 test1 = null;
@Test
public void num1Test() {
test = new Test1(111);
System.out.println("Num 1 : " + test.getNum());
}
@Test
public void num2Test() {
test1 = new Test1(222);
System.out.println("Num 2 : " + test1.getNum());
}
}
Output :
输出 ：
Test cases are executed successfully & shows the values of num variable which was initialized in test methods on console.
测试用例成功执行并显示在控制台上的测试方法中初始化的 num 变量的值。
Num 1 : 111
Num 2 : 222
回答by Duncan Jones
I suppose you could use a @Ruleto ensure populateRandomData()is called each time with the correct parameters.
我想您可以使用 a@Rule来确保populateRandomData()每次都使用正确的参数调用。
However, this gets ugly quickly since you then need to maintain a list of test method names.
然而，这很快就会变得丑陋，因为您需要维护一个测试方法名称列表。
private static final Map<String, Integer> dataCounts = new HashMap<>();
static {
// list (or otherwise obtain) counts here
dataCounts.put("testMethod", 100);
}
@Rule
public TestWatcher watcher = new TestWatcher() {
@Override
protected void starting(Description description) {
Integer count = dataCounts.get(description.getMethodName());
assertNotNull(count);
populateRandomData(count.intValue());
};
};
