mattjackson220 commented on a change in pull request #4721:
URL: https://github.com/apache/trafficcontrol/pull/4721#discussion_r432166740



##########
File path: traffic_ops/traffic_ops_golang/cachegroup/cachegroups_test.go
##########
@@ -272,3 +273,73 @@ func TestValidate(t *testing.T) {
                t.Errorf("expected nil, got %s", err)
        }
 }
+
+func TestBadTypeParamCacheGroups(t *testing.T) {
+       detail := `cachegroup read: converting cachegroup type to integer 
strconv.Atoi: parsing "wrong": invalid syntax`
+       mockDB, mock, err := sqlmock.New()
+       if err != nil {
+               t.Fatalf("an error '%s' was not expected when opening a stub 
database connection", err)
+       }
+       defer mockDB.Close()
+
+       db := sqlx.NewDb(mockDB, "sqlmock")
+       defer db.Close()
+
+       testCGs := getTestCacheGroups()
+       rows := sqlmock.NewRows([]string{
+               "id",
+               "name",
+               "short_name",
+               "latitude",
+               "longitude",
+               "localization_methods",
+               "parent_cachegroup_id",
+               "parent_cachegroup_name",
+               "secondary_parent_cachegroup_id",
+               "secondary_parent_cachegroup_name",
+               "type_name",
+               "type_id",
+               "last_updated",
+               "fallbacks",
+               "fallbackToClosest",
+       })
+
+       for _, ts := range testCGs {
+               rows = rows.AddRow(
+                       ts.ID,
+                       ts.Name,
+                       ts.ShortName,
+                       ts.Latitude,
+                       ts.Longitude,
+                       []byte("{DEEP_CZ,CZ,GEO}"),
+                       ts.ParentCachegroupID,
+                       ts.ParentName,
+                       ts.SecondaryParentCachegroupID,
+                       ts.SecondaryParentName,
+                       ts.Type,
+                       ts.TypeID,
+                       ts.LastUpdated,
+                       []byte("{cachegroup2,cachegroup3}"),
+                       ts.FallbackToClosest,
+               )
+       }
+       mock.ExpectBegin()
+       mock.ExpectQuery("SELECT").WillReturnRows(rows)
+       mock.ExpectCommit()
+
+       reqInfo := api.APIInfo{Tx: db.MustBegin(), Params: 
map[string]string{"type": "wrong"}}
+       obj := TOCacheGroup{
+               api.APIInfoImpl{&reqInfo},
+               tc.CacheGroupNullable{},
+       }
+       _, userErr, _, sc := obj.Read()
+       if sc != http.StatusBadRequest {
+               t.Errorf("Read expected status code: Bad Request, actual: %v ", 
sc)
+       }
+       if userErr == nil {
+               t.Errorf("Read expected: user error with details %v, actual: 
nil", detail)
+       }
+       if userErr.Error() != detail {
+               t.Errorf("Read expected: user error with details %v, actual: 
%v", detail, userErr.Error())

Review comment:
       Can you change these `Errorf`s to `Fatalf`s?  At least the one on line 
340 because otherwise in the case of a failure it will get userErr as nil for 
line 342 and get a nil exception. but might as well change them both




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