feat: add getTeamsFromOrganization use case

src/main/java/io/pakland/mdas/githubstats/domain/service/GetTeamsFromOrganization.java

@@ -0,0 +1,18 @@
+package io.pakland.mdas.githubstats.domain.service;
+
+import io.pakland.mdas.githubstats.domain.model.Organization;
+import io.pakland.mdas.githubstats.domain.model.Team;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+public class GetTeamsFromOrganization {
+    public GetTeamsFromOrganization() { }
+
+    @Transactional
+    public List<Team> execute(Organization org) {
+        return org.getTeams();
+    }
+}

src/test/java/io/pakland/mdas/githubstats/domain/service/GetTeamsFromOrganizationTest.java

@@ -0,0 +1,26 @@
+package io.pakland.mdas.githubstats.domain.service;
+
+import io.pakland.mdas.githubstats.domain.model.Organization;
+import io.pakland.mdas.githubstats.domain.model.Team;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GetTeamsFromOrganizationTest {
+    @Test
+    public void givenOrganization_shouldReturnListOfTeams() {
+        Team team = new Team();
+        team.setId(1L);
+        Organization organizationMock = Mockito.mock(Organization.class);
+        Mockito.when(organizationMock.getTeams()).thenReturn(List.of(team));
+
+        GetTeamsFromOrganization useCase = new GetTeamsFromOrganization();
+        List<Team> teams = useCase.execute(organizationMock);
+
+        Mockito.verify(organizationMock, Mockito.times(1)).getTeams();
+        assertEquals(teams.get(0).getId(), team.getId());
+    }
+}