integrate_test.go

Documentation: github.com/magiconair/properties

     1  // Copyright 2013-2022 Frank Schroeder. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package properties
     6  
     7  import (
     8  	"flag"
     9  	"fmt"
    10  	"testing"
    11  )
    12  
    13  // TestFlag verifies Properties.MustFlag without flag.FlagSet.Parse
    14  func TestFlag(t *testing.T) {
    15  	f := flag.NewFlagSet("src", flag.PanicOnError)
    16  	gotS := f.String("s", "?", "string flag")
    17  	gotI := f.Int("i", -1, "int flag")
    18  
    19  	p := NewProperties()
    20  	p.MustSet("s", "t")
    21  	p.MustSet("i", "9")
    22  	p.MustFlag(f)
    23  
    24  	if want := "t"; *gotS != want {
    25  		t.Errorf("Got string s=%q, want %q", *gotS, want)
    26  	}
    27  	if want := 9; *gotI != want {
    28  		t.Errorf("Got int i=%d, want %d", *gotI, want)
    29  	}
    30  }
    31  
    32  // TestFlagOverride verifies Properties.MustFlag with flag.FlagSet.Parse.
    33  func TestFlagOverride(t *testing.T) {
    34  	f := flag.NewFlagSet("src", flag.PanicOnError)
    35  	gotA := f.Int("a", 1, "remain default")
    36  	gotB := f.Int("b", 2, "customized")
    37  	gotC := f.Int("c", 3, "overridden")
    38  
    39  	if err := f.Parse([]string{"-c", "4"}); err != nil {
    40  		t.Fatal(err)
    41  	}
    42  
    43  	p := NewProperties()
    44  	p.MustSet("b", "5")
    45  	p.MustSet("c", "6")
    46  	p.MustFlag(f)
    47  
    48  	if want := 1; *gotA != want {
    49  		t.Errorf("Got remain default a=%d, want %d", *gotA, want)
    50  	}
    51  	if want := 5; *gotB != want {
    52  		t.Errorf("Got customized b=%d, want %d", *gotB, want)
    53  	}
    54  	if want := 4; *gotC != want {
    55  		t.Errorf("Got overridden c=%d, want %d", *gotC, want)
    56  	}
    57  }
    58  
    59  func ExampleProperties_MustFlag() {
    60  	x := flag.Int("x", 0, "demo customize")
    61  	y := flag.Int("y", 0, "demo override")
    62  
    63  	// Demo alternative for flag.Parse():
    64  	flag.CommandLine.Parse([]string{"-y", "10"})
    65  	fmt.Printf("flagged as x=%d, y=%d\n", *x, *y)
    66  
    67  	p := NewProperties()
    68  	p.MustSet("x", "7")
    69  	p.MustSet("y", "42") // note discard
    70  	p.MustFlag(flag.CommandLine)
    71  	fmt.Printf("configured to x=%d, y=%d\n", *x, *y)
    72  
    73  	// Output:
    74  	// flagged as x=0, y=10
    75  	// configured to x=7, y=10
    76  }
    77
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