OZG-4949 Avoided Hamcrest

src/test/java/de/ozgcloud/admin/common/errorhandling/ExceptionControllerITCase.java

 package de.ozgcloud.admin.common.errorhandling;
 
-import static org.hamcrest.Matchers.*;
-import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.*;
 import static org.mockito.Mockito.*;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
@@ -15,7 +14,8 @@ import jakarta.validation.Validation;
 import jakarta.validation.Validator;
 import jakarta.validation.constraints.NotEmpty;
 
-import org.junit.jupiter.api.BeforeEach;
+import org.apache.commons.lang3.StringUtils;
+import org.assertj.core.util.Arrays;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -79,34 +79,45 @@ class ExceptionControllerITCase {
 
 	@Nested
 	class TestConstraintViolationException {
-
-		@BeforeEach
-		void mockModelAssemblerForException() {
+		@Test
+		@SneakyThrows
+		void shouldHaveInvalidFieldNameInResponse() {
 			when(modelAssembler.toModel(any())).thenAnswer((a) -> {
-				throw new ConstraintViolationException(getConstraintViolations());
+				throw new ConstraintViolationException(getConstraintViolations("Not Empty"));
 			});
 
+			var result = performGet();
+
+			result.andExpect(jsonPath("$.invalid-params[*].name").value("string2"));
 		}
 
 		@Test
 		@SneakyThrows
-		void shouldHaveFailedFieldNamesInResponse() {
+		void shouldHaveTwoInvalidParamsInResponse() {
+			when(modelAssembler.toModel(any())).thenAnswer((a) -> {
+				throw new ConstraintViolationException(getConstraintViolations(StringUtils.EMPTY));
+			});
+
 			var result = performGet();
 
-			result.andExpect(jsonPath("$.invalid-params[*].name").value(containsInAnyOrder("string1", "string2")));
+			result.andExpect(jsonPath("$.invalid-params[*].length()").value(Arrays.asList(new Integer[] { 2, 2 })));
 		}
 
 		@Test
 		@SneakyThrows
 		void shouldHaveMessageInResponse() {
+			when(modelAssembler.toModel(any())).thenAnswer((a) -> {
+				throw new ConstraintViolationException(getConstraintViolations(StringUtils.EMPTY));
+			});
+
 			var result = performGet();
 
 			result.andExpect(jsonPath("$.invalid-params[0].reason").value("Empty field"));
 		}
 
-		private Set<ConstraintViolation<ValidatedClass>> getConstraintViolations() {
+		private Set<ConstraintViolation<ValidatedClass>> getConstraintViolations(String string) {
 			Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
-			return validator.validate(ValidatedClass.builder().build());
+			return validator.validate(ValidatedClass.builder().string1(string).build());
 		}
 
 		@Getter