Ian Lance Taylor | c2225a7 | 2020-01-02 15:05:27 -0800 | [diff] [blame] | 1 | // Copyright 2019 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package runtime_test |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "encoding/binary" |
| 10 | "errors" |
| 11 | "internal/testenv" |
| 12 | "os/exec" |
| 13 | "reflect" |
| 14 | "runtime" |
| 15 | "testing" |
| 16 | ) |
| 17 | |
| 18 | func TestFakeTime(t *testing.T) { |
| 19 | if runtime.GOOS == "windows" { |
| 20 | t.Skip("faketime not supported on windows") |
| 21 | } |
| 22 | if runtime.Compiler == "gccgo" { |
| 23 | t.Skip("faketime not supported for gccgo") |
| 24 | } |
| 25 | |
| 26 | t.Parallel() |
| 27 | |
| 28 | exe, err := buildTestProg(t, "testfaketime", "-tags=faketime") |
| 29 | if err != nil { |
| 30 | t.Fatal(err) |
| 31 | } |
| 32 | |
| 33 | var stdout, stderr bytes.Buffer |
| 34 | cmd := exec.Command(exe) |
| 35 | cmd.Stdout = &stdout |
| 36 | cmd.Stderr = &stderr |
| 37 | |
| 38 | err = testenv.CleanCmdEnv(cmd).Run() |
| 39 | if err != nil { |
| 40 | t.Fatalf("exit status: %v\n%s", err, stderr.String()) |
| 41 | } |
| 42 | |
| 43 | t.Logf("raw stdout: %q", stdout.String()) |
| 44 | t.Logf("raw stderr: %q", stdout.String()) |
| 45 | |
| 46 | f1, err1 := parseFakeTime(stdout.Bytes()) |
| 47 | if err1 != nil { |
| 48 | t.Fatal(err1) |
| 49 | } |
| 50 | f2, err2 := parseFakeTime(stderr.Bytes()) |
| 51 | if err2 != nil { |
| 52 | t.Fatal(err2) |
| 53 | } |
| 54 | |
| 55 | const time0 = 1257894000000000000 |
| 56 | got := [][]fakeTimeFrame{f1, f2} |
| 57 | var want = [][]fakeTimeFrame{{ |
| 58 | {time0 + 1, "line 2\n"}, |
| 59 | {time0 + 1, "line 3\n"}, |
| 60 | {time0 + 1e9, "line 5\n"}, |
| 61 | {time0 + 1e9, "2009-11-10T23:00:01Z"}, |
| 62 | }, { |
| 63 | {time0, "line 1\n"}, |
| 64 | {time0 + 2, "line 4\n"}, |
| 65 | }} |
| 66 | if !reflect.DeepEqual(want, got) { |
| 67 | t.Fatalf("want %v, got %v", want, got) |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | type fakeTimeFrame struct { |
| 72 | time uint64 |
| 73 | data string |
| 74 | } |
| 75 | |
| 76 | func parseFakeTime(x []byte) ([]fakeTimeFrame, error) { |
| 77 | var frames []fakeTimeFrame |
| 78 | for len(x) != 0 { |
| 79 | if len(x) < 4+8+4 { |
| 80 | return nil, errors.New("truncated header") |
| 81 | } |
| 82 | const magic = "\x00\x00PB" |
| 83 | if string(x[:len(magic)]) != magic { |
| 84 | return nil, errors.New("bad magic") |
| 85 | } |
| 86 | x = x[len(magic):] |
| 87 | time := binary.BigEndian.Uint64(x) |
| 88 | x = x[8:] |
| 89 | dlen := binary.BigEndian.Uint32(x) |
| 90 | x = x[4:] |
| 91 | data := string(x[:dlen]) |
| 92 | x = x[dlen:] |
| 93 | frames = append(frames, fakeTimeFrame{time, data}) |
| 94 | } |
| 95 | return frames, nil |
| 96 | } |