以下代码从 JUnit4 开始,大部分已翻译为 JUnit5,除了main()
。我这样写的原因是我正在演示 TDD 并且我有多个版本StringInverter
实现,每个实现更多的功能并通过更多的测试。这里是StringInverter
界面:
interface StringInverter {
public String invert(String str);
}
这是几乎用 JUnit5 编译的类:
import java.util.*;
import org.junit.jupiter.api.*;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.platform.runner.JUnitPlatform;
public class StringInverterTest {
static StringInverter inverter;
@Test
public final void basicInversion_Succeed() {
String in = "Exit, Pursued by a Bear.";
String out = "eXIT, pURSUED BY A bEAR.";
assertEquals(inverter.invert(in), out);
}
@Test
public final void basicInversion_Fail() {
expectThrows(RuntimeException.class, () -> {
assertEquals(inverter.invert("X"), "X");
});
}
@Test
public final void allowedCharacters_Fail() {
expectThrows(RuntimeException.class, () -> {
inverter.invert(";-_()*&^%$#@!~`");
inverter.invert("0123456789");
});
}
@Test
public final void allowedCharacters_Succeed() {
inverter.invert("abcdefghijklmnopqrstuvwxyz ,.");
inverter.invert("ABCDEFGHIJKLMNOPQRSTUVWXYZ ,.");
}
@Test
public final void lengthLessThan26_Fail() {
String str = "xxxxxxxxxxxxxxxxxxxxxxxxxx";
assertTrue(str.length() > 25);
expectThrows(RuntimeException.class, () -> {
inverter.invert(str);
});
}
@Test
public final void lengthLessThan26_Succeed() {
String str = "xxxxxxxxxxxxxxxxxxxxxxxxx";
assertTrue(str.length() < 26);
inverter.invert(str);
}
public static void main(String[] args) throws Exception{
assertEquals(args.length, 1);
inverter = (StringInverter)
Class.forName(args[0]).newInstance();
Result result = org.junit.runner.JUnitCore.runClasses(
StringInverterTest.class);
List<Failure> failures = result.getFailures();
System.out.printf("%s has %d FAILURES:\n",
args[0], failures.size());
int count = 1;
for(Failure f : failures) {
System.out.printf("Failure %d:\n", count++);
System.out.println(f.getDescription());
System.out.println(f.getMessage());
}
}
}
main()
使用 JUnit4,所以我的问题是如何将其转换为 JUnit 5。谢谢!
我找到了如何从主静态方法启动单元测试的解决方案。
依赖项:
org.junit.jupiter:junit-jupiter-api:5.2.0
org.junit.platform:junit-platform-launcher:1.2.0
org.junit.jupiter:junit-jupiter-engine:5.2.0
代码示例:
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import org.junit.jupiter.api.function.Executable;
import org.junit.platform.launcher.core.LauncherDiscoveryRequestBuilder;
import org.junit.platform.launcher.Launcher;
import org.junit.platform.launcher.LauncherDiscoveryRequest;
import org.junit.platform.launcher.core.LauncherFactory;
import static org.junit.platform.engine.discovery.DiscoverySelectors.selectClass;
import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
import org.junit.platform.launcher.listeners.TestExecutionSummary;
import org.junit.platform.launcher.listeners.TestExecutionSummary.Failure;
import java.util.List;
public class MyClass {
public static void main(String args[]) {
final LauncherDiscoveryRequest request =
LauncherDiscoveryRequestBuilder.request()
.selectors(selectClass(MyClass.class))
.build();
final Launcher launcher = LauncherFactory.create();
final SummaryGeneratingListener listener = new SummaryGeneratingListener();
launcher.registerTestExecutionListeners(listener);
launcher.execute(request);
TestExecutionSummary summary = listener.getSummary();
long testFoundCount = summary.getTestsFoundCount();
List<Failure> failures = summary.getFailures();
System.out.println("getTestsSucceededCount() - " + summary.getTestsSucceededCount());
failures.forEach(failure -> System.out.println("failure - " + failure.getException()));
}
@Test
void exceptionTesting() {
Executable closureContainingCodeToTest = () -> {throw new IllegalArgumentException("a message");};
Throwable throwable = assertThrows(IllegalArgumentException.class, closureContainingCodeToTest, "a message");
assertEquals("a message", throwable.getMessage());
}
}
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