我试图用Junits覆盖我的JsonService实用类，但我得到了异常，我试图解决这个问题，从很长一段时间，但仍然问题没有解决，一些人可以帮助我，请。
public final class JsonService {
private static final ObjectMapper MAPPER;
private JsonService() {
// Added to remove sonar issues.
}
static {
log.debug("Start of JsonService static block ");
MAPPER = new ObjectMapper();
MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
MAPPER.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
MAPPER.setSerializationInclusion(Include.NON_NULL);
log.debug("End of JsonService static block ");
}
public static <T> T getObjectFromJson(final Object jsonString, final Class<T> valueType) {
// log.debug("Start of JsonService.getObjectFromJson() method.. {}");
T object = null;
if (jsonString != null) {
try {
object = MAPPER.readValue(jsonString.toString(), valueType);
// log.debug(DEBUG_LOG_STR, object);
} catch (IOException io) {
log.error(ERROR_LOG_STR + " in method getObjectFromJson(). Exception Message={}, Exception Stack ={}",
io.getMessage(), io);
throw new ServiceException(ErrorMessages.JSON_SERIALIZATION_ERROR, io.getCause());
}
}
// log.debug("End of JsonService.getObjectFromJson() method.. {}");
return object;
}
}
public class JsonServiceTest {
@Test
public void getObjectFromJsonTest() throws Exception {
// PowerMockito.mockStatic(JsonService.class);
ObjectMapper mapper = new ObjectMapper();
TestHelper helper = new TestHelper();
helper.setName("name");
helper.setId(1);
String json = mapper.writeValueAsString(helper);
TestHelper actual = JsonService.getObjectFromJson(json, TestHelper.class);
assertEquals(actual.getName(), "name");
assertEquals(actual.getId(), 1);
}
class TestHelper {
String name;
long id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
}
com.att.idp.externalpartnerorder.exception.ServiceException
at com.att.idp.externalpartnerorder.common.util.JsonService.getObjectFromJson(JsonService.java:81)
at com.att.idp.externalpartnerorder.common.util.JsonServiceTest.getObjectFromJsonTest(JsonServiceTest.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
不需要模拟 ObjectMapper 尝试转换任何类类型的对象，你有在代码和转换为JSON使用ObjectMapper和调用的方法 getObjectFromJson 然后再断言对象的属性。
步骤
import static org.hamcrest.CoreMatchers.equalTo;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.Serializable;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ErrorCollector;
import org.junit.rules.ExpectedException;
import org.junit.rules.RuleChain;
public class JsonServiceTest {
private static final String NAME = "name";
private static final String TITLE = "title";
private static final long ID = 1L;
public ErrorCollector collector = new ErrorCollector();
public ExpectedException expectedException = ExpectedException.none();
@Rule
public RuleChain ruleChain = RuleChain.outerRule(collector).around(expectedException);
@Test
public void getObjectFromJsonTest() throws Exception {
// Arrange
ObjectMapper mapper = new ObjectMapper();
TestHelper helper = new TestHelper();
helper.setName(NAME);
helper.setId(ID);
String json = mapper.writeValueAsString(helper);
// Act
TestHelper actual = JsonService.getObjectFromJson(json, TestHelper.class);
// Assert
collector.checkThat(actual.getName(), equalTo(NAME));
collector.checkThat(actual.getId(), equalTo(ID));
}
@Test
public void getExceptionFromJsonTest() throws Exception {
// Assert
expectedException.expect(Exception.class);
// Arrange
ObjectMapper mapper = new ObjectMapper();
TestExceptionHelper helper = new TestExceptionHelper();
helper.setTitle(TITLE);
String json = mapper.writeValueAsString(helper);
// Act
TestExceptionHelper actual = JsonService.getObjectFromJson(json, TestExceptionHelper.class);
}
class TestExceptionHelper implements Serializable {
String title;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
static class TestHelper implements Serializable {
String name;
long id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
}
}