103 lines
3.2 KiB
Go
103 lines
3.2 KiB
Go
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// Copyright (c) 2013-2016 Dave Collins <dave@davec.name>
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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// NOTE: Due to the following build constraints, this file will only be compiled
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// when the code is not running on Google App Engine, compiled by GopherJS, and
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// "-tags safe" is not added to the go build command line. The "disableunsafe"
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// tag is deprecated and thus should not be used.
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// +build !js,!appengine,!safe,!disableunsafe
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/*
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This test file is part of the spew package rather than than the spew_test
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package because it needs access to internals to properly test certain cases
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which are not possible via the public interface since they should never happen.
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*/
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package spew
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import (
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"bytes"
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"reflect"
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"testing"
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"unsafe"
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)
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// changeKind uses unsafe to intentionally change the kind of a reflect.Value to
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// the maximum kind value which does not exist. This is needed to test the
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// fallback code which punts to the standard fmt library for new types that
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// might get added to the language.
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func changeKind(v *reflect.Value, readOnly bool) {
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rvf := (*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(v)) + offsetFlag))
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*rvf = *rvf | ((1<<flagKindWidth - 1) << flagKindShift)
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if readOnly {
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*rvf |= flagRO
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} else {
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*rvf &= ^uintptr(flagRO)
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}
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}
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// TestAddedReflectValue tests functionaly of the dump and formatter code which
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// falls back to the standard fmt library for new types that might get added to
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// the language.
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func TestAddedReflectValue(t *testing.T) {
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i := 1
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// Dump using a reflect.Value that is exported.
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v := reflect.ValueOf(int8(5))
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changeKind(&v, false)
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buf := new(bytes.Buffer)
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d := dumpState{w: buf, cs: &Config}
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d.dump(v)
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s := buf.String()
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want := "(int8) 5"
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if s != want {
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t.Errorf("TestAddedReflectValue #%d\n got: %s want: %s", i, s, want)
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}
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i++
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// Dump using a reflect.Value that is not exported.
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changeKind(&v, true)
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buf.Reset()
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d.dump(v)
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s = buf.String()
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want = "(int8) <int8 Value>"
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if s != want {
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t.Errorf("TestAddedReflectValue #%d\n got: %s want: %s", i, s, want)
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}
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i++
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// Formatter using a reflect.Value that is exported.
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changeKind(&v, false)
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buf2 := new(dummyFmtState)
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f := formatState{value: v, cs: &Config, fs: buf2}
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f.format(v)
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s = buf2.String()
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want = "5"
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if s != want {
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t.Errorf("TestAddedReflectValue #%d got: %s want: %s", i, s, want)
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}
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i++
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// Formatter using a reflect.Value that is not exported.
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changeKind(&v, true)
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buf2.Reset()
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f = formatState{value: v, cs: &Config, fs: buf2}
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f.format(v)
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s = buf2.String()
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want = "<int8 Value>"
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if s != want {
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t.Errorf("TestAddedReflectValue #%d got: %s want: %s", i, s, want)
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}
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}
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