clerk/internal/testutil/golden/golden.go (view raw)
| 1 | package golden |
| 2 | |
| 3 | import ( |
| 4 | "flag" |
| 5 | "os" |
| 6 | "path/filepath" |
| 7 | "strings" |
| 8 | "testing" |
| 9 | ) |
| 10 | |
| 11 | var update = flag.Bool("update", false, "update golden files") |
| 12 | |
| 13 | func Assert(t *testing.T, got string) { |
| 14 | t.Helper() |
| 15 | |
| 16 | name := strings.NewReplacer("/", "__", " ", "_").Replace(t.Name()) |
| 17 | name = strings.TrimLeft(name, "Test") |
| 18 | path := filepath.Join("testdata", "golden", name+".golden") |
| 19 | |
| 20 | if *update { |
| 21 | if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil { |
| 22 | t.Fatalf("creating golden dir: %v", err) |
| 23 | } |
| 24 | t.Logf("Saving golden file in %s", got) |
| 25 | if err := os.WriteFile(path, []byte(got), 0o644); err != nil { |
| 26 | t.Fatalf("writing golden file: %v", err) |
| 27 | } |
| 28 | return |
| 29 | } |
| 30 | |
| 31 | golden, err := os.ReadFile(path) |
| 32 | if os.IsNotExist(err) { |
| 33 | t.Fatalf("no golden file, run with -update:\n%s", got) |
| 34 | } |
| 35 | if err != nil { |
| 36 | t.Fatalf("reading golden file: %v", err) |
| 37 | } |
| 38 | |
| 39 | if string(golden) != got { |
| 40 | t.Fatalf("golden mismatch\nwant:\n%s\ngot:\n%s", string(golden), got) |
| 41 | } |
| 42 | } |