Improve "synced block.." log (#9760)

runtime/version/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@prysm//tools/go:def.bzl", "go_library")
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
@@ -20,3 +20,9 @@ go_library(
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
     ],
 )
+
+go_test(
+    name = "go_default_test",
+    srcs = ["fork_test.go"],
+    embed = [":go_default_library"],
+)

runtime/version/fork.go

@@ -4,3 +4,14 @@ const (
 	Phase0 = iota
 	Altair
 )
+
+func String(version int) string {
+	switch version {
+	case Phase0:
+		return "phase0"
+	case Altair:
+		return "altair"
+	default:
+		return "unknown version"
+	}
+}

runtime/version/fork_test.go

@@ -0,0 +1,29 @@
+package version
+
+import "testing"
+
+func TestVersionString(t *testing.T) {
+	tests := []struct {
+		name    string
+		version int
+		want    string
+	}{
+		{
+			name:    "phase0",
+			version: Phase0,
+			want:    "phase0",
+		},
+		{
+			name:    "altair",
+			version: Altair,
+			want:    "altair",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := String(tt.version); got != tt.want {
+				t.Errorf("String() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}