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