diff --git a/1-anemic-ddd/src/main/java/local/mydherin/users/domain/rol/services/IsShort.java b/1-anemic-ddd/src/main/java/local/mydherin/users/domain/rol/services/IsShort.java
index 0a6aaa0..0d99e75 100644
--- a/1-anemic-ddd/src/main/java/local/mydherin/users/domain/rol/services/IsShort.java
+++ b/1-anemic-ddd/src/main/java/local/mydherin/users/domain/rol/services/IsShort.java
@@ -4,7 +4,7 @@
 
 public class IsShort {
 
-    private final Integer SHORT_NAME_LENGTH = 5;
+    public static final Integer SHORT_NAME_LENGTH = 5;
 
     public Boolean execute(final IsShortQuery query) {
         final var rol = query.getRol();
diff --git a/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionTest.java b/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionTest.java
new file mode 100644
index 0000000..c9625be
--- /dev/null
+++ b/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionTest.java
@@ -0,0 +1,57 @@
+package local.mydherin.users.application.user.usecases;
+
+import local.mydherin.users.application.user.repository.UserRepository;
+import local.mydherin.users.domain.user.User;
+import local.mydherin.users.shared.motherobject.UserMother;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+public final class GetUserCollectionTest {
+    @Mock
+    private UserRepository userRepository;
+    private GetUserCollection getUserCollection;
+    @BeforeEach
+    public void setUp() {
+        getUserCollection = new GetUserCollection(
+                userRepository
+        );
+    }
+    @Test
+    void user_repository_works_properly()
+    {
+        // Given
+        final List<User> standardUserList = givenAListOfStandardUsers();
+        when(userRepository.findBy(null)).thenReturn(standardUserList);
+
+        // When
+        final List<User> result = getUserCollection.execute();
+
+        // Then
+        thenUserRepositoryWorksProperly(standardUserList, result);
+    }
+
+    private List<User> givenAListOfStandardUsers()
+    {
+        return Arrays.asList(
+                UserMother.getStandardUser(),
+                UserMother.getStandardUser()
+        );
+    }
+
+    private void thenUserRepositoryWorksProperly(final List<User> expected, final List<User> result)
+    {
+        assertEquals(expected, result);
+        verify(userRepository).findBy(null);
+    }
+}
\ No newline at end of file
diff --git a/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionWithShortRolNameTest.java b/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionWithShortRolNameTest.java
new file mode 100644
index 0000000..b1ad747
--- /dev/null
+++ b/1-anemic-ddd/src/test/java/local/mydherin/users/application/user/usecases/GetUserCollectionWithShortRolNameTest.java
@@ -0,0 +1,86 @@
+package local.mydherin.users.application.user.usecases;
+
+import local.mydherin.users.application.user.repository.UserRepository;
+import local.mydherin.users.domain.rol.services.IsShort;
+import local.mydherin.users.domain.user.User;
+import local.mydherin.users.domain.user.services.FilterByShortRolName;
+import local.mydherin.users.shared.motherobject.UserMother;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Arrays;
+import java.util.List;
+
+@ExtendWith(MockitoExtension.class)
+public final class GetUserCollectionWithShortRolNameTest {
+    @Mock
+    private UserRepository userRepository;
+    private GetUserCollectionWithShortRolName getUserCollectionWithShortRolName;
+    @BeforeEach
+    public void setUp() {
+        getUserCollectionWithShortRolName = new GetUserCollectionWithShortRolName(
+                userRepository,
+                new FilterByShortRolName(new IsShort())
+        );
+    }
+    @Test
+    void return_a_list_of_users_with_short_rol_name_given_users_with_short_and_long_rol_names()
+    {
+        // Given
+        final List<User> userList = givenAListOfUsersWithLongAndShortRolNames();
+        Mockito.when(userRepository.findBy(null)).thenReturn(userList);
+
+        // When
+        final List<User> result = getUserCollectionWithShortRolName.execute();
+
+        // Then
+        thenAllUsersHaveShortRolName(result);
+    }
+
+    @Test
+    void return_an_empty_list_of_users_given_users_with_only_long_rol_names()
+    {
+        // Given
+        final List<User> userList = givenAListOfUsersWithOnlyLongRolNames();
+        Mockito.when(userRepository.findBy(null)).thenReturn(userList);
+
+        // When
+        final List<User> result = getUserCollectionWithShortRolName.execute();
+
+        // Then
+        thenTheListOfUsersIsEmpty(result);
+    }
+
+    private List<User> givenAListOfUsersWithLongAndShortRolNames()
+    {
+        return Arrays.asList(
+                UserMother.getUserWithAdminRol(),
+                UserMother.getUserWithTontorronRol()
+        );
+    }
+
+    private List<User> givenAListOfUsersWithOnlyLongRolNames()
+    {
+        return Arrays.asList(
+                UserMother.getUserWithTontorronRol(),
+                UserMother.getUserWithTontorronRol()
+        );
+    }
+
+    private void thenAllUsersHaveShortRolName(List<User> userList)
+    {
+        userList.forEach(user -> {
+            Assertions.assertTrue(user.getRol().getName().isShorterThan(IsShort.SHORT_NAME_LENGTH));
+        });
+    }
+
+    private void thenTheListOfUsersIsEmpty(List<User> userList)
+    {
+        Assertions.assertTrue(userList.isEmpty());
+    }
+}
diff --git a/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/RolMother.java b/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/RolMother.java
new file mode 100644
index 0000000..3a2571b
--- /dev/null
+++ b/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/RolMother.java
@@ -0,0 +1,26 @@
+package local.mydherin.users.shared.motherobject;
+
+import local.mydherin.users.domain.rol.Rol;
+import local.mydherin.users.domain.rol.vos.Name;
+import local.mydherin.users.domain.rol.vos.RolId;
+
+public final class RolMother {
+    private RolMother()
+    {}
+
+    public static Rol getAdminRol()
+    {
+        return Rol.of(
+                RolId.of("1"),
+                Name.of("ADMIN")
+        );
+    }
+
+    public static Rol getTontorronRol()
+    {
+        return Rol.of(
+                RolId.of("2"),
+                Name.of("TONTORRON")
+        );
+    }
+}
diff --git a/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/UserMother.java b/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/UserMother.java
new file mode 100644
index 0000000..4a946c9
--- /dev/null
+++ b/1-anemic-ddd/src/test/java/local/mydherin/users/shared/motherobject/UserMother.java
@@ -0,0 +1,42 @@
+package local.mydherin.users.shared.motherobject;
+
+import local.mydherin.users.domain.user.User;
+import local.mydherin.users.domain.user.vos.Age;
+import local.mydherin.users.domain.user.vos.DNI;
+import local.mydherin.users.domain.user.vos.Name;
+import local.mydherin.users.domain.user.vos.UserId;
+
+public final class UserMother {
+    private UserMother()
+    {}
+    public static User getStandardUser()
+    {
+        return User.of(
+                UserId.of("1"),
+                Name.of("Any user 1"),
+                Age.of(25),
+                DNI.of("10000000Z"),
+                RolMother.getTontorronRol()
+        );
+    }
+    public static User getUserWithAdminRol()
+    {
+        return User.of(
+                UserId.of("1"),
+                Name.of("User with rol admin 1"),
+                Age.of(25),
+                DNI.of("10000000Z"),
+                RolMother.getAdminRol()
+        );
+    }
+    public static User getUserWithTontorronRol()
+    {
+        return User.of(
+                UserId.of("1"),
+                Name.of("User with rol tontorron 1"),
+                Age.of(25),
+                DNI.of("10000000Z"),
+                RolMother.getTontorronRol()
+        );
+    }
+}