github.com/mre-fog/trillianxx@v1.1.2-0.20180615153820-ae375a99d36a/cmd/flags_test.go (about)

     1  // Copyright 2017 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cmd
    16  
    17  import (
    18  	"flag"
    19  	"os"
    20  	"testing"
    21  
    22  	_ "github.com/golang/glog"
    23  )
    24  
    25  func TestParseFlags(t *testing.T) {
    26  	var a, b string
    27  	flag.StringVar(&a, "a", "", "")
    28  	flag.StringVar(&b, "b", "", "")
    29  
    30  	flag.CommandLine.Init(os.Args[0], flag.ContinueOnError)
    31  
    32  	tests := []struct {
    33  		name        string
    34  		contents    string
    35  		env         map[string]string
    36  		cliArgs     []string
    37  		expectedErr string
    38  		expectedA   string
    39  		expectedB   string
    40  	}{
    41  		{
    42  			name:      "two flags per line",
    43  			contents:  "-a one -b two",
    44  			expectedA: "one",
    45  			expectedB: "two",
    46  		},
    47  		{
    48  			name:      "one flag per line",
    49  			contents:  "-a one\n-b two",
    50  			expectedA: "one",
    51  			expectedB: "two",
    52  		},
    53  		{
    54  			name:      "one flag per line, with line continuation",
    55  			contents:  "-a one \\\n-b two",
    56  			expectedA: "one",
    57  			expectedB: "two",
    58  		},
    59  		{
    60  			name:      "one flag in file, one flag on command-line",
    61  			contents:  "-a one",
    62  			cliArgs:   []string{"-b", "two"},
    63  			expectedA: "one",
    64  			expectedB: "two",
    65  		},
    66  		{
    67  			name:      "two flags, one overridden by command-line",
    68  			contents:  "-a one\n-b two",
    69  			cliArgs:   []string{"-b", "three"},
    70  			expectedA: "one",
    71  			expectedB: "three",
    72  		},
    73  		{
    74  			name:      "two flags, one using an environment variable",
    75  			contents:  "-a one\n-b $TEST_VAR",
    76  			env:       map[string]string{"TEST_VAR": "from env"},
    77  			expectedA: "one",
    78  			expectedB: "from env",
    79  		},
    80  		{
    81  			name:        "three flags, one undefined",
    82  			contents:    "-a one -b two -c three",
    83  			expectedErr: "flag provided but not defined: -c",
    84  		},
    85  	}
    86  
    87  	initialArgs := os.Args[:]
    88  	for _, tc := range tests {
    89  		a, b = "", ""
    90  		os.Args = append(initialArgs, tc.cliArgs...)
    91  		for k, v := range tc.env {
    92  			if err := os.Setenv(k, v); err != nil {
    93  				t.Errorf("%v: os.SetEnv(%q, %q) = %q", tc.name, k, v, err)
    94  			}
    95  		}
    96  
    97  		if err := parseFlags(tc.contents); err != nil {
    98  			if err.Error() != tc.expectedErr {
    99  				t.Errorf("%v: parseFlags() = %q, want %q", tc.name, err, tc.expectedErr)
   100  			}
   101  			continue
   102  		}
   103  
   104  		if tc.expectedA != a {
   105  			t.Errorf("%v: flag 'a' not properly set: got %q, want %q", tc.name, a, tc.expectedA)
   106  		}
   107  		if tc.expectedB != b {
   108  			t.Errorf("%v: flag 'b' not properly set: got %q, want %q", tc.name, b, tc.expectedB)
   109  		}
   110  	}
   111  }