TestLineWidth tests output against test images generated by running tests with -tag good.
(t *testing.T)
| 22 | // TestLineWidth tests output against test images generated by |
| 23 | // running tests with -tag good. |
| 24 | func TestLineWidth(t *testing.T) { |
| 25 | formats := []string{ |
| 26 | // TODO: Add logic to cope with run to run eps differences. |
| 27 | "pdf", |
| 28 | "svg", |
| 29 | "png", |
| 30 | "tiff", |
| 31 | "jpg", |
| 32 | } |
| 33 | |
| 34 | const ( |
| 35 | width = 100 |
| 36 | height = 100 |
| 37 | ) |
| 38 | |
| 39 | for _, w := range []vg.Length{-1, 0, 1} { |
| 40 | for _, typ := range formats { |
| 41 | p, err := lines(w) |
| 42 | if err != nil { |
| 43 | log.Fatalf("failed to create plot for %v:%s: %v", w, typ, err) |
| 44 | } |
| 45 | |
| 46 | c, err := p.WriterTo(width, height, typ) |
| 47 | if err != nil { |
| 48 | t.Fatalf("failed to render plot for %v:%s: %v", w, typ, err) |
| 49 | } |
| 50 | |
| 51 | var buf bytes.Buffer |
| 52 | if _, err = c.WriteTo(&buf); err != nil { |
| 53 | t.Fatalf("failed to write plot for %v:%s: %v", w, typ, err) |
| 54 | } |
| 55 | |
| 56 | name := filepath.Join(".", "testdata", fmt.Sprintf("width_%v_golden.%s", w, typ)) |
| 57 | |
| 58 | // Recreate Golden images. |
| 59 | if *cmpimg.GenerateTestData { |
| 60 | err = p.Save(width, height, name) |
| 61 | if err != nil { |
| 62 | log.Fatalf("failed to save %q: %v", name, err) |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | want, err := os.ReadFile(name) |
| 67 | if err != nil { |
| 68 | t.Fatalf("failed to read test image [%s]: %v\n", name, err) |
| 69 | } |
| 70 | |
| 71 | ok, err := cmpimg.Equal(typ, buf.Bytes(), want) |
| 72 | if err != nil { |
| 73 | t.Fatalf("failed to run cmpimg test [%s]: %v\n", name, err) |
| 74 | } |
| 75 | |
| 76 | if !ok { |
| 77 | got := strings.Replace(name, "_golden.", ".", 1) |
| 78 | err = os.WriteFile(got, buf.Bytes(), 0644) |
| 79 | if err != nil { |
| 80 | t.Errorf("could not write plot image %q: %+v", got, err) |
| 81 | } |