Add sonarqube (#37)

app/src/test/java/io/github/wulkanowy/dao/EntitiesCompareTest.java

@@ -10,7 +10,7 @@ import java.util.List;
 import io.github.wulkanowy.dao.entities.Grade;
 
 
-public class EntitiesCompareTest extends EntitiesCompare {
+public class EntitiesCompareTest {
 
     private List<Grade> newList = new ArrayList<>();
 

app/src/test/java/io/github/wulkanowy/utilities/AverageCalculatorTest.java

@@ -8,7 +8,7 @@ import java.util.List;
 
 import io.github.wulkanowy.dao.entities.Grade;
 
-public class AverageCalculatorTest extends AverageCalculator {
+public class AverageCalculatorTest {
 
     @Test
     public void averageTest() {

app/src/test/java/io/github/wulkanowy/utilities/ConnectionUtilitiesTest.java

@@ -10,7 +10,7 @@ import org.junit.Test;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
-public class ConnectionUtilitiesTest extends ConnectionUtilities {
+public class ConnectionUtilitiesTest {
 
     @Test
     public void isOnlineTrueTest() {

app/src/test/java/io/github/wulkanowy/utilities/ConversionVulcanObjectTest.java

@@ -9,7 +9,7 @@ import java.util.List;
 import io.github.wulkanowy.api.grades.Grade;
 import io.github.wulkanowy.api.grades.Subject;
 
-public class ConversionVulcanObjectTest extends ConversionVulcanObject {
+public class ConversionVulcanObjectTest {
 
     @Test
     public void subjectConversionTest() {

app/src/test/java/io/github/wulkanowy/utilities/DateHelperTest.java

@@ -11,7 +11,7 @@ import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
 
-public class DateHelperTest extends DateHelper {
+public class DateHelperTest {
 
     @Test
     public void getTicksDateObjectTest() throws Exception {