fix: address verified review findings (labels-milestones-time-1)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/alias_completion_test.go

@@ -443,3 +443,25 @@ func TestActionValueCompletionOutsideARepository(t *testing.T) {
 		require.ElementsMatch(t, tc.want, values, name)
 	}
 }
+
+func TestMilestoneCompletionOffersTheMilestonesTheCommandAccepts(t *testing.T) {
+	var states []string
+	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/api/v1/repos/alice/project/milestones" {
+			states = append(states, r.URL.Query().Get("state"))
+		}
+		_, _ = w.Write([]byte(`[]`))
+	}))
+	defer server.Close()
+	deps, _, _ := serverDeps(t, server.URL)
+	a := &application{deps: deps}
+	a.options.repo = "alice/project"
+	root := a.milestoneCommand()
+	for _, path := range [][]string{{"reopen"}, {"close"}, {"view"}, {"issue", "list"}} {
+		cmd, _, err := root.Find(path)
+		require.NoError(t, err)
+		cmd.SetContext(context.Background())
+		cmd.ValidArgsFunction(cmd, nil, "")
+	}
+	require.Equal(t, []string{"closed", "open", "all", "all"}, states)
+}