1 /* 2 * Copyright (c) 2013-2016 Dave Collins <dave@davec.name> 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 /* 18 This test file is part of the spew package rather than than the spew_test 19 package because it needs access to internals to properly test certain cases 20 which are not possible via the public interface since they should never happen. 21 */ 22 23 package spew 24 25 import ( 26 "bytes" 27 "reflect" 28 "testing" 29 ) 30 31 // dummyFmtState implements a fake fmt.State to use for testing invalid 32 // reflect.Value handling. This is necessary because the fmt package catches 33 // invalid values before invoking the formatter on them. 34 type dummyFmtState struct { 35 bytes.Buffer 36 } 37 38 func (dfs *dummyFmtState) Flag(f int) bool { 39 return f == int('+') 40 } 41 42 func (dfs *dummyFmtState) Precision() (int, bool) { 43 return 0, false 44 } 45 46 func (dfs *dummyFmtState) Width() (int, bool) { 47 return 0, false 48 } 49 50 // TestInvalidReflectValue ensures the dump and formatter code handles an 51 // invalid reflect value properly. This needs access to internal state since it 52 // should never happen in real code and therefore can't be tested via the public 53 // API. 54 func TestInvalidReflectValue(t *testing.T) { 55 i := 1 56 57 // Dump invalid reflect value. 58 v := new(reflect.Value) 59 buf := new(bytes.Buffer) 60 d := dumpState{w: buf, cs: &Config} 61 d.dump(*v) 62 s := buf.String() 63 want := "<invalid>" 64 if s != want { 65 t.Errorf("InvalidReflectValue #%d\n got: %s want: %s", i, s, want) 66 } 67 i++ 68 69 // Formatter invalid reflect value. 70 buf2 := new(dummyFmtState) 71 f := formatState{value: *v, cs: &Config, fs: buf2} 72 f.format(*v) 73 s = buf2.String() 74 want = "<invalid>" 75 if s != want { 76 t.Errorf("InvalidReflectValue #%d got: %s want: %s", i, s, want) 77 } 78 } 79 80 // SortValues makes the internal sortValues function available to the test 81 // package. 82 func SortValues(values []reflect.Value, cs *ConfigState) { 83 sortValues(values, cs) 84 } 85