I am trying to cover My JsonService utility class with Junits but i am getting exception and i am trying to resolve this from long time but still issue not resolved can some one help me please.
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)
No need to mock ObjectMapper try to convert a object of any class type do you have in the code and convert to JSON using ObjectMapper and call the method getObjectFromJson then assert the object properties after that.
Steps
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;
}
}
}