Add gallery app, native window and architecture tests

gallery/invariants_test.go

@@ -0,0 +1,106 @@
+package gallery
+
+import (
+	"image"
+	"image/color"
+	"image/png"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+// render draws view in a w×h dot window.
+func render(view func(c *ui.Context), w, h int) *image.RGBA {
+	return ui.Render(view, 2*w, 2*h, 1)
+}
+
+func colors(ps ...*pixel.Palette) map[color.RGBA]bool {
+	out := map[color.RGBA]bool{}
+	for _, p := range ps {
+		for _, c := range p.Colors {
+			out[color.RGBA{c.R, c.G, c.B, 255}] = true
+		}
+	}
+	return out
+}
+
+// keepsStyle fails on off-palette colors or off-grid dots.
+func keepsStyle(t *testing.T, name string, img *image.RGBA, allowed map[color.RGBA]bool) {
+	t.Helper()
+	b := img.Bounds()
+	for y := 0; y < b.Dy(); y += 2 {
+		for x := 0; x < b.Dx(); x += 2 {
+			c := img.RGBAAt(x, y)
+			if !allowed[c] {
+				t.Fatalf("%s: pixel %d,%d is %v, off the palette", name, x, y, c)
+			}
+			if img.RGBAAt(x+1, y) != c || img.RGBAAt(x, y+1) != c || img.RGBAAt(x+1, y+1) != c {
+				t.Fatalf("%s: dot at %d,%d is split across the grid", name, x/2, y/2)
+			}
+		}
+	}
+}
+
+func shot(t *testing.T, name string, img *image.RGBA) {
+	dir := os.Getenv("PIXEL_SHOTS")
+	if dir == "" {
+		return
+	}
+	f, err := os.Create(filepath.Join(dir, name+".png"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	if err := png.Encode(f, img); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestInvariantsEntries(t *testing.T) {
+	for _, e := range Entries() {
+		for i, pal := range pixel.Palettes {
+			allowed := colors(pal)
+			if strings.Contains(e.Code(), "pixel.Scope(") {
+				allowed = colors(pixel.Palettes...)
+			}
+			img := render(func(c *ui.Context) {
+				pixel.Use(c, pixel.Settings{Palette: pal})
+				ui.Column(c).Fill().Padding(pixel.K(c).D(8)).Children(func() { e.Demo(c, func(string) {}) })
+			}, 320, 240)
+			keepsStyle(t, e.Slug()+" in "+pal.Name, img, allowed)
+			if i == 0 {
+				shot(t, e.Slug(), img)
+			}
+		}
+	}
+}
+
+func TestInvariantsPages(t *testing.T) {
+	pages := map[string]string{"boot": "", "home": "/", "category": "/cat/foundations", "entry": "/f/palettes", "lost": "/nowhere", "search": "?pal"}
+	for name, path := range pages {
+		for i, pal := range pixel.Palettes {
+			a := New("/")
+			a.palette = i
+			switch {
+			case strings.HasPrefix(path, "?"):
+				a.started, a.query = true, path[1:]
+			case path != "":
+				a.Go(path)
+			}
+			allowed := colors(pal)
+			if name == "entry" {
+				allowed = colors(pixel.Palettes...)
+			}
+			img := render(a.View, 640, 400)
+			keepsStyle(t, name+" in "+pal.Name, img, allowed)
+			if i == 0 {
+				shot(t, "page-"+name, img)
+			}
+		}
+	}
+}