tests/thirdparty: package metadata (#223)

Fetches third-party package metadata from Github.

tests/thirdparty/metadata_test.go

@@ -0,0 +1,56 @@
+package thirdparty
+
+import (
+	"context"
+	"flag"
+	"testing"
+
+	"github.com/mmcloughlin/avo/internal/github"
+	"github.com/mmcloughlin/avo/internal/test"
+)
+
+var update = flag.Bool("update", false, "update package metadata")
+
+func TestPackagesFileMetadata(t *testing.T) {
+	test.RequiresNetwork(t)
+	ctx := context.Background()
+
+	pkgs, err := LoadPackagesFile("packages.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	g := github.NewClient(github.WithTokenFromEnvironment())
+
+	for _, pkg := range pkgs {
+		// Fetch metadata.
+		r, err := g.Repository(ctx, pkg.Repository.Owner, pkg.Repository.Name)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		// Update, if requested.
+		if *update {
+			pkg.DefaultBranch = r.DefaultBranch
+			pkg.Metadata.Description = r.Description
+			pkg.Metadata.Homepage = r.Homepage
+			pkg.Metadata.Stars = r.StargazersCount
+
+			t.Logf("%s: metadata updated", pkg.ID())
+		}
+
+		// Check up to date. Potentially fast-changing properties not included.
+		uptodate := true
+		uptodate = pkg.DefaultBranch == r.DefaultBranch && uptodate
+		uptodate = pkg.Metadata.Description == r.Description && uptodate
+		uptodate = pkg.Metadata.Homepage == r.Homepage && uptodate
+
+		if !uptodate {
+			t.Errorf("%s: metadata out of date (use -update flag to fix)", pkg.ID())
+		}
+	}
+
+	if err := StorePackagesFile("packages.json", pkgs); err != nil {
+		t.Fatal(err)
+	}
+}