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// Copyright 2017 Google LLC. All Rights Reserved.
//
// 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 cmd
import (
"flag"
"os"
"testing"
_ "k8s.io/klog/v2"
)
func TestParseFlags(t *testing.T) {
var a, b string
flag.StringVar(&a, "a", "", "")
flag.StringVar(&b, "b", "", "")
flag.CommandLine.Init(os.Args[0], flag.ContinueOnError)
tests := []struct {
name string
contents string
env map[string]string
cliArgs []string
expectedErr string
expectedA string
expectedB string
}{
{
name: "two flags per line",
contents: "-a one -b two",
expectedA: "one",
expectedB: "two",
},
{
name: "one flag per line",
contents: "-a one\n-b two",
expectedA: "one",
expectedB: "two",
},
{
name: "one flag per line, with line continuation",
contents: "-a one \\\n-b two",
expectedA: "one",
expectedB: "two",
},
{
name: "one flag in file, one flag on command-line",
contents: "-a one",
cliArgs: []string{"-b", "two"},
expectedA: "one",
expectedB: "two",
},
{
name: "two flags, one overridden by command-line",
contents: "-a one\n-b two",
cliArgs: []string{"-b", "three"},
expectedA: "one",
expectedB: "three",
},
{
name: "two flags, one using an environment variable",
contents: "-a one\n-b $TEST_VAR",
env: map[string]string{"TEST_VAR": "from env"},
expectedA: "one",
expectedB: "from env",
},
{
name: "three flags, one undefined",
contents: "-a one -b two -c three",
expectedErr: "flag provided but not defined: -c",
},
}
initialArgs := os.Args[:]
for _, tc := range tests {
a, b = "", ""
os.Args = append(initialArgs, tc.cliArgs...)
for k, v := range tc.env {
if err := os.Setenv(k, v); err != nil {
t.Errorf("%v: os.SetEnv(%q, %q) = %q", tc.name, k, v, err)
}
}
if err := parseFlags(tc.contents); err != nil {
if err.Error() != tc.expectedErr {
t.Errorf("%v: parseFlags() = %q, want %q", tc.name, err, tc.expectedErr)
}
continue
}
if tc.expectedA != a {
t.Errorf("%v: flag 'a' not properly set: got %q, want %q", tc.name, a, tc.expectedA)
}
if tc.expectedB != b {
t.Errorf("%v: flag 'b' not properly set: got %q, want %q", tc.name, b, tc.expectedB)
}
}
}
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