108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
package mujica
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import (
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"bytes"
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"flag"
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"image"
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"image/png"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"sync"
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"testing"
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"github.com/egoist/mygo/ui"
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)
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var update = flag.Bool("update", false, "rewrite snapshots")
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// snapshot compares view in both themes with testdata/snapshots/<os>/<name>-<mode>.png.
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func snapshot(t *testing.T, name string, w, h int, view func(c *ui.Context)) {
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t.Helper()
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snapshotAfter(t, name, w, h, view, nil)
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}
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// snapshotChild marks a process that renders snapshots itself.
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const snapshotChild = "MUJICA_SNAPSHOT_CHILD"
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var snapshotRan sync.Map
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// snapshotAfter is snapshot with drive sending input before the capture.
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func snapshotAfter(t *testing.T, name string, w, h int, view func(c *ui.Context), drive func(tt *ui.Tester)) {
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t.Helper()
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if os.Getenv(snapshotChild) == "" {
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snapshotInChild(t)
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return
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}
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for _, m := range []Mode{Light, Dark} {
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ready := false
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tt := ui.NewTester(func(c *ui.Context) {
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Use(c, Settings{Mode: m})
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if ready {
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view(c)
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}
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}, w, h)
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// Animations must not paint before ReduceMotion applies.
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tt.SetPreferences(ui.Preferences{ReduceMotion: true, TextScale: 1})
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ready = true
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tt.Frame()
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if drive != nil {
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drive(tt)
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}
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got := encode(t, tt.Image())
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path := filepath.Join("testdata", "snapshots", runtime.GOOS, name+"-"+strings.ToLower(m.String())+".png")
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if *update {
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if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
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t.Fatal(err)
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}
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if err := os.WriteFile(path, got, 0o644); err != nil {
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t.Fatal(err)
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}
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continue
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}
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want, err := os.ReadFile(path)
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if err != nil {
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t.Fatalf("%v (run go test -update)", err)
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}
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if !bytes.Equal(got, want) {
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if err := os.WriteFile(path+".got.png", got, 0o644); err != nil {
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t.Fatal(err)
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}
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t.Errorf("%s differs; see %s.got.png", path, path)
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}
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}
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}
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// snapshotInChild reruns the test alone in a fresh process; MyGo's path cache is process-wide.
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func snapshotInChild(t *testing.T) {
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t.Helper()
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if _, done := snapshotRan.LoadOrStore(t.Name(), true); done {
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return
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}
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parts := strings.Split(t.Name(), "/")
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for i, p := range parts {
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parts[i] = "^" + regexp.QuoteMeta(p) + "$"
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}
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args := []string{"-test.run=" + strings.Join(parts, "/"), "-test.count=1"}
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if *update {
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args = append(args, "-update")
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}
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cmd := exec.Command(os.Args[0], args...)
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cmd.Env = append(os.Environ(), snapshotChild+"=1")
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if out, err := cmd.CombinedOutput(); err != nil {
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t.Fatalf("snapshot child failed: %v\n%s", err, out)
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}
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}
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func encode(t *testing.T, img image.Image) []byte {
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t.Helper()
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var b bytes.Buffer
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if err := png.Encode(&b, img); err != nil {
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t.Fatal(err)
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}
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return b.Bytes()
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}
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