feat(caddy): add ListCertificates method, refactor Caddy client layout (#31)

pkg/client/caddy_test.go

@@ -1,6 +1,7 @@
 package client
 
 import (
+	"context"
 	"testing"
 
 	"github.com/distribution/reference"
@@ -11,8 +12,29 @@ import (
 func TestLatestCaddyImage(t *testing.T) {
 	t.Parallel()
 
-	image, err := LatestCaddyImage()
+	image, err := latestCaddyImage(context.Background())
 	require.NoError(t, err)
 
 	assert.Regexp(t, `^caddy:2\.\d+\.\d+$`, reference.FamiliarString(image))
 }
+
+func TestLatestCaddyTag(t *testing.T) {
+	t.Parallel()
+
+	for _, tt := range []struct {
+		name string
+		tags []string
+		want string
+	}{
+		{name: "empty", want: "latest"},
+		{name: "semantic ordering", tags: []string{"2.9.9", "2.11.4", "2.10.0", "2.11.3"}, want: "2.11.4"},
+		{name: "ignore other versions and variants", tags: []string{
+			"latest", "1.0.0", "3.0.0", "2.12.0-rc.1", "2.12.0-alpine", "2.12", "v2.12.0", "2.11.4",
+		}, want: "2.11.4"},
+		{name: "no stable version", tags: []string{"builder", "2.12.0-beta.1"}, want: "latest"},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.want, latestCaddyTag(tt.tags))
+		})
+	}
+}