EPMRPP-81970 || Autocomplete in Recipients filed on Notifications tab in Project settings should show options starting from 1 symbol

src/main/java/com/epam/ta/reportportal/core/project/impl/GetProjectHandlerImpl.java

@@ -66,6 +66,9 @@
 @Service
 public class GetProjectHandlerImpl implements GetProjectHandler {
 
+	private static final String LENGTH_LESS_THAN_1_SYMBOL_MSG = "Length of the filtering string "
+			+ "'{}' is less than 1 symbol";
+
 	private final ProjectRepository projectRepository;
 
 	private final UserRepository userRepository;
@@ -133,19 +136,19 @@ public ProjectResource getResource(String projectName, ReportPortalUser user) {
 
 	@Override
 	public List<String> getUserNames(ReportPortalUser.ProjectDetails projectDetails, String value) {
-		BusinessRule.expect(value.length() > 2, Predicates.equalTo(true))
-				.verify(ErrorType.INCORRECT_FILTER_PARAMETERS,
-						Suppliers.formattedSupplier("Length of the filtering string '{}' is less than 3 symbols", value)
-				);
+		checkBusinessRuleLessThan1Symbol(value);
 		return userRepository.findNamesByProject(projectDetails.getProjectId(), value);
 	}
 
-	@Override
-	public Iterable<SearchUserResource> getUserNames(String value, ReportPortalUser.ProjectDetails projectDetails, Pageable pageable) {
+	private void checkBusinessRuleLessThan1Symbol(String value) {
 		BusinessRule.expect(value.length() >= 1, Predicates.equalTo(true))
 				.verify(ErrorType.INCORRECT_FILTER_PARAMETERS,
-						Suppliers.formattedSupplier("Length of the filtering string '{}' is less than 1 symbol", value)
-				);
+						Suppliers.formattedSupplier(LENGTH_LESS_THAN_1_SYMBOL_MSG, value));
+	}
+
+	@Override
+	public Iterable<SearchUserResource> getUserNames(String value, ReportPortalUser.ProjectDetails projectDetails, Pageable pageable) {
+		checkBusinessRuleLessThan1Symbol(value);
 
 		final CompositeFilterCondition userCondition = getUserSearchCondition(value);
 

src/test/java/com/epam/ta/reportportal/core/project/impl/GetProjectHandlerImplTest.java

@@ -111,10 +111,12 @@ void getUserNamesByIncorrectTerm() {
 		ReportPortalUser user = getRpUser("user", UserRole.USER, ProjectRole.PROJECT_MANAGER, projectId);
 
 		ReportPortalException exception = assertThrows(ReportPortalException.class,
-				() -> handler.getUserNames(extractProjectDetails(user, "test_project"), "qw")
+				() -> handler.getUserNames(extractProjectDetails(user, "test_project"), "")
 		);
 
-		assertEquals("Incorrect filtering parameters. Length of the filtering string 'qw' is less than 3 symbols", exception.getMessage());
+		assertEquals(
+				"Incorrect filtering parameters. Length of the filtering string '' is less than 1 symbol",
+				exception.getMessage());
 	}
 
 	@Test