Add gallery app, native window and architecture tests

gallery/registry_test.go

@@ -0,0 +1,74 @@
+package gallery
+
+import (
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestRegistry(t *testing.T) {
+	slugs, ids := map[string]bool{}, map[int]bool{}
+	known := map[string]bool{}
+	for _, c := range Categories {
+		known[c.Key] = true
+	}
+	for _, e := range Entries() {
+		if e.Name == "" || e.Zh == "" || e.Summary == "" || e.Demo == nil {
+			t.Fatalf("entry %+v is incomplete", e)
+		}
+		if !known[e.Category] {
+			t.Fatalf("%s: unknown category %q", e.Name, e.Category)
+		}
+		if (e.ID == 0) != (e.Category == "foundations") || e.ID < 0 || e.ID > 500 {
+			t.Fatalf("%s: id %d in %s", e.Name, e.ID, e.Category)
+		}
+		if slugs[e.Slug()] || e.ID > 0 && ids[e.ID] {
+			t.Fatalf("%s: duplicate slug or id", e.Slug())
+		}
+		slugs[e.Slug()], ids[e.ID] = true, true
+		if !strings.HasPrefix(e.Code(), "func "+funcName(e.Demo)+"(") {
+			t.Fatalf("%s: code snippet %q", e.Slug(), e.Code()[:min(40, len(e.Code()))])
+		}
+	}
+}
+
+// Every exported component function appears in a demo.
+func TestEveryComponentHasADemo(t *testing.T) {
+	var demos strings.Builder
+	for _, e := range Entries() {
+		demos.WriteString(e.Code())
+	}
+	for _, cat := range Categories[1:] {
+		files, _ := filepath.Glob(filepath.Join("..", cat.Key, "*.go"))
+		for _, f := range files {
+			if strings.HasSuffix(f, "_test.go") {
+				continue
+			}
+			src, err := os.ReadFile(f)
+			if err != nil {
+				t.Fatal(err)
+			}
+			file, err := parser.ParseFile(token.NewFileSet(), f, src, 0)
+			if err != nil {
+				t.Fatal(err)
+			}
+			for _, d := range file.Decls {
+				fn, ok := d.(*ast.FuncDecl)
+				if !ok || fn.Recv != nil || !fn.Name.IsExported() || fn.Type.Params.NumFields() == 0 {
+					continue
+				}
+				if p, ok := fn.Type.Params.List[0].Type.(*ast.StarExpr); ok {
+					if sel, ok := p.X.(*ast.SelectorExpr); ok && sel.Sel.Name == "Context" {
+						if call := cat.Key + "." + fn.Name.Name + "("; !strings.Contains(demos.String(), call) {
+							t.Errorf("%s has no demo", call)
+						}
+					}
+				}
+			}
+		}
+	}
+}