test: add test for getter of existing team

src/test/java/cz/muni/fi/pa165/icehockeymanager/services/TeamServiceImplTest.java

@@ -52,6 +52,15 @@ class TeamServiceImplTest {
         verify(teamDao).read(1L);
     }
 
+    @Test
+    public void geExistingTeams() {
+        var expected = Optional.of(buildTeam("Carolina Hurricanes"));
+        when(teamDao.read(1L)).thenReturn(expected);
+        assertThat(teamService.getTeam(1)).isEqualTo(expected);
+        verify(teamDao).read(1L);
+    }
+
+
     private Team buildTeam(String name) {
         var team = new Team();
         team.setName(name);