forked from cerc-io/ipld-eth-server
77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
// Copyright 2018 Frank Schroeder. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package properties
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import (
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"flag"
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"fmt"
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"testing"
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)
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// TestFlag verifies Properties.MustFlag without flag.FlagSet.Parse
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func TestFlag(t *testing.T) {
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f := flag.NewFlagSet("src", flag.PanicOnError)
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gotS := f.String("s", "?", "string flag")
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gotI := f.Int("i", -1, "int flag")
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p := NewProperties()
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p.MustSet("s", "t")
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p.MustSet("i", "9")
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p.MustFlag(f)
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if want := "t"; *gotS != want {
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t.Errorf("Got string s=%q, want %q", *gotS, want)
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}
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if want := 9; *gotI != want {
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t.Errorf("Got int i=%d, want %d", *gotI, want)
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}
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}
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// TestFlagOverride verifies Properties.MustFlag with flag.FlagSet.Parse.
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func TestFlagOverride(t *testing.T) {
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f := flag.NewFlagSet("src", flag.PanicOnError)
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gotA := f.Int("a", 1, "remain default")
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gotB := f.Int("b", 2, "customized")
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gotC := f.Int("c", 3, "overridden")
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if err := f.Parse([]string{"-c", "4"}); err != nil {
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t.Fatal(err)
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}
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p := NewProperties()
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p.MustSet("b", "5")
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p.MustSet("c", "6")
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p.MustFlag(f)
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if want := 1; *gotA != want {
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t.Errorf("Got remain default a=%d, want %d", *gotA, want)
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}
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if want := 5; *gotB != want {
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t.Errorf("Got customized b=%d, want %d", *gotB, want)
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}
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if want := 4; *gotC != want {
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t.Errorf("Got overridden c=%d, want %d", *gotC, want)
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}
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}
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func ExampleProperties_MustFlag() {
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x := flag.Int("x", 0, "demo customize")
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y := flag.Int("y", 0, "demo override")
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// Demo alternative for flag.Parse():
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flag.CommandLine.Parse([]string{"-y", "10"})
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fmt.Printf("flagged as x=%d, y=%d\n", *x, *y)
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p := NewProperties()
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p.MustSet("x", "7")
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p.MustSet("y", "42") // note discard
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p.MustFlag(flag.CommandLine)
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fmt.Printf("configured to x=%d, y=%d\n", *x, *y)
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// Output:
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// flagged as x=0, y=10
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// configured to x=7, y=10
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}
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