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// 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"
"strings"
"testing"
"go.uber.org/zap"
)
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)
}
// first verify that flags are as expected before reading the env
for f, want := range map[string]string{
"a": "",
"b": "bar",
} {
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(zap.NewExample(), "ETCD", fs)
if err != nil {
t.Errorf("err=%v, want nil", err)
}
for f, want := range map[string]string{
"a": "foo",
"b": "bar",
} {
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(zap.NewExample(), "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")
err := SetFlagsFromEnv(zap.NewExample(), "ETCD", fs)
for _, v := range []string{"invalid syntax", "parse error"} {
if strings.Contains(err.Error(), v) {
err = nil
break
}
}
if err != nil {
t.Fatalf("unexpected error %v", err)
}
}
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