| // Copyright 2015 The etcd Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package flags |
| |
| import ( |
| "flag" |
| "os" |
| "testing" |
| ) |
| |
| func TestSetFlagsFromEnv(t *testing.T) { |
| fs := flag.NewFlagSet("testing", flag.ExitOnError) |
| fs.String("a", "", "") |
| fs.String("b", "", "") |
| fs.String("c", "", "") |
| fs.Parse([]string{}) |
| |
| os.Clearenv() |
| // flags should be settable using env vars |
| os.Setenv("ETCD_A", "foo") |
| // and command-line flags |
| if err := fs.Set("b", "bar"); err != nil { |
| t.Fatal(err) |
| } |
| // command-line flags take precedence over env vars |
| os.Setenv("ETCD_C", "woof") |
| if err := fs.Set("c", "quack"); err != nil { |
| t.Fatal(err) |
| } |
| |
| // first verify that flags are as expected before reading the env |
| for f, want := range map[string]string{ |
| "a": "", |
| "b": "bar", |
| "c": "quack", |
| } { |
| if got := fs.Lookup(f).Value.String(); got != want { |
| t.Fatalf("flag %q=%q, want %q", f, got, want) |
| } |
| } |
| |
| // now read the env and verify flags were updated as expected |
| err := SetFlagsFromEnv("ETCD", fs) |
| if err != nil { |
| t.Errorf("err=%v, want nil", err) |
| } |
| for f, want := range map[string]string{ |
| "a": "foo", |
| "b": "bar", |
| "c": "quack", |
| } { |
| if got := fs.Lookup(f).Value.String(); got != want { |
| t.Errorf("flag %q=%q, want %q", f, got, want) |
| } |
| } |
| } |
| |
| func TestSetFlagsFromEnvBad(t *testing.T) { |
| // now verify that an error is propagated |
| fs := flag.NewFlagSet("testing", flag.ExitOnError) |
| fs.Int("x", 0, "") |
| os.Setenv("ETCD_X", "not_a_number") |
| if err := SetFlagsFromEnv("ETCD", fs); err == nil { |
| t.Errorf("err=nil, want != nil") |
| } |
| } |
| |
| func TestSetFlagsFromEnvParsingError(t *testing.T) { |
| fs := flag.NewFlagSet("etcd", flag.ContinueOnError) |
| var tickMs uint |
| fs.UintVar(&tickMs, "heartbeat-interval", 0, "Time (in milliseconds) of a heartbeat interval.") |
| |
| if oerr := os.Setenv("ETCD_HEARTBEAT_INTERVAL", "100 # ms"); oerr != nil { |
| t.Fatal(oerr) |
| } |
| defer os.Unsetenv("ETCD_HEARTBEAT_INTERVAL") |
| |
| if serr := SetFlagsFromEnv("ETCD", fs); serr.Error() != `invalid value "100 # ms" for ETCD_HEARTBEAT_INTERVAL: strconv.ParseUint: parsing "100 # ms": invalid syntax` { |
| t.Fatalf("expected parsing error, got %v", serr) |
| } |
| } |