55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
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package command
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import (
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"flag"
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"testing"
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)
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func TestParseUnreachable(t *testing.T) {
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// top level bypasses name matching and recursive calls to Parse
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// returns when encountering zero-length args
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t.Run("zero-length args", func(t *testing.T) {
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defer checkRecover(t, "Parse", "attempted to parse with zero length args")
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_ = newNode(panicWriter{}, nil, " ", " ").Parse(nil)
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})
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// top level must not have siblings
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t.Run("toplevel siblings", func(t *testing.T) {
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defer checkRecover(t, "Parse", "invalid toplevel state")
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n := newNode(panicWriter{}, nil, " ", "")
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n.append(newNode(panicWriter{}, nil, " ", " "))
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_ = n.Parse(nil)
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})
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// a node with descendents must not have a direct handler
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t.Run("sub handle conflict", func(t *testing.T) {
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defer checkRecover(t, "Parse", "invalid subcommand tree state")
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n := newNode(panicWriter{}, nil, " ", "")
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n.adopt(newNode(panicWriter{}, nil, " ", " "))
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n.f = func([]string) error { panic("unreachable") }
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_ = n.Parse(nil)
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})
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// this would only happen if a node was matched twice
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t.Run("parsed flag set", func(t *testing.T) {
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defer checkRecover(t, "Parse", "invalid set state")
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n := newNode(panicWriter{}, nil, " ", "")
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set := flag.NewFlagSet("parsed", flag.ContinueOnError)
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set.SetOutput(panicWriter{})
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_ = set.Parse(nil)
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n.set = set
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_ = n.Parse(nil)
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})
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}
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type panicWriter struct{}
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func (p panicWriter) Write([]byte) (int, error) { panic("unreachable") }
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func checkRecover(t *testing.T, name, wantPanic string) {
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if r := recover(); r != wantPanic {
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t.Errorf("%s: panic = %v; wantPanic %v",
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name, r, wantPanic)
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}
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}
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