✅ : corrects test based on mutation tests

src/test/java/io/codeka/gaia/teams/controller/TeamsRestControllerTest.java

@@ -1,13 +1,18 @@
 package io.codeka.gaia.teams.controller;
 
+import io.codeka.gaia.teams.Team;
 import io.codeka.gaia.teams.repository.TeamRepository;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
 @ExtendWith(MockitoExtension.class)
 class TeamsRestControllerTest {
@@ -20,8 +25,15 @@ class TeamsRestControllerTest {
 
     @Test
     void teams_shouldReturnAllTeams() {
-        teamsRestController.teams();
+        // given
+        var a = new Team("A");
+        when(teamRepository.findAll()).thenReturn(List.of(a));
+
+        // when
+        var teams = teamsRestController.teams();
 
+        // then
+        assertThat(teams).contains(a);
         verify(teamRepository).findAll();
     }
 }