Fix error mesage of ShouldNotHaveSameClass and test naming convention…

… of same class assertions (#2038)

Co-authored-by: Kim S. Ly <lykims@users.noreply.github.com>

src/main/java/org/assertj/core/error/ShouldNotHaveSameClass.java

@@ -30,6 +30,6 @@ public static ErrorMessageFactory shouldNotHaveSameClass(Object actual, Object o
   }
 
   private ShouldNotHaveSameClass(Object actual, Object other) {
-    super("%nExpecting:%n <%s>%nnot to have not the same class as:%n <%s> (%s)", actual, other, actual.getClass());
+    super("%nExpecting:%n <%s>%nnot to have the same class as:%n <%s> (%s)", actual, other, actual.getClass());
   }
 }

src/test/java/org/assertj/core/api/abstract_/AbstractAssert_doesNotHaveTheSameClassAs_Test.java → src/test/java/org/assertj/core/api/abstract_/AbstractAssert_doesNotHaveSameClassAs_Test.java

@@ -24,7 +24,7 @@
  * 
  * @author Nicolas François
  */
-class AbstractAssert_doesNotHaveTheSameClassAs_Test extends AbstractAssertBaseTest {
+class AbstractAssert_doesNotHaveSameClassAs_Test extends AbstractAssertBaseTest {
 
   @Override
   protected ConcreteAssert invoke_api_method() {

src/test/java/org/assertj/core/api/abstract_/AbstractAssert_hasTheSameClassAs_Test.java → src/test/java/org/assertj/core/api/abstract_/AbstractAssert_hasSameClassAs_Test.java

@@ -24,7 +24,7 @@
  * 
  * @author Nicolas François
  */
-class AbstractAssert_hasTheSameClassAs_Test extends AbstractAssertBaseTest {
+class AbstractAssert_hasSameClassAs_Test extends AbstractAssertBaseTest {
 
   @Override
   protected ConcreteAssert invoke_api_method() {

src/test/java/org/assertj/core/error/ShouldNotHaveSameClass_create_Test.java

@@ -34,6 +34,6 @@ void should_create_error_message() {
     // WHEN
     String message = factory.create(new TestDescription("Test"), new StandardRepresentation());
     // THEN
-    then(message).isEqualTo(format("[Test] %nExpecting:%n <\"Yoda\">%nnot to have not the same class as:%n <\"Luke\"> (java.lang.String)"));
+    then(message).isEqualTo(format("[Test] %nExpecting:%n <\"Yoda\">%nnot to have the same class as:%n <\"Luke\"> (java.lang.String)"));
   }
 }

src/test/java/org/assertj/core/internal/objects/Objects_assertDoesNotHaveNotSameClassAs_Test.java → src/test/java/org/assertj/core/internal/objects/Objects_assertDoesNotHaveSameClassAs_Test.java

@@ -35,7 +35,7 @@
  * @author Nicolas François
  * @author Joel Costigliola
  */
-class Objects_assertDoesNotHaveNotSameClassAs_Test extends ObjectsBaseTest {
+class Objects_assertDoesNotHaveSameClassAs_Test extends ObjectsBaseTest {
 
   private static Person actual;